Merge pull request #440 from ueokande/background-clean-architecture

Background clean architecture

74 files changed, 1648 insertions, 1344 deletions

diff --git a/e2e/contents/tab.test.js b/e2e/contents/tab.test.js
index ada3760..bfc22ea 100644
--- a/e2e/contents/tab.test.js
+++ b/e2e/contents/tab.test.js
@@ -165,6 +165,7 @@ describe("tab test", () => {
   });
 
   it('opens view-source by gf', async () => {
+    await new Promise(resolve => setTimeout(resolve, 100));
     let win = await windows.get(targetWindow.id);
     let tab = win.tabs[0];
     await keys.press(tab.id, 'g');
diff --git a/karma.conf.js b/karma.conf.js
index 871e62a..7331331 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -13,9 +13,9 @@ module.exports = function (config) {
     ],
 
     preprocessors: {
-      'test/main.js': [ 'webpack' ],
-      'test/**/*.test.js': [ 'webpack' ],
-      'test/**/*.test.jsx': [ 'webpack' ],
+      'test/main.js': [ 'webpack', 'sourcemap' ],
+      'test/**/*.test.js': [ 'webpack', 'sourcemap' ],
+      'test/**/*.test.jsx': [ 'webpack', 'sourcemap' ],
       'test/**/*.html': ['html2js']
     },
 
diff --git a/src/background/actions/command.js b/src/background/actions/command.js
deleted file mode 100644
index a7f619b..0000000
--- a/src/background/actions/command.js
+++ /dev/null
@@ -1,147 +0,0 @@
-import actions from '../actions';
-import * as consoleActions from './console';
-import * as tabs from '../shared/tabs';
-import * as bookmarks from '../shared/bookmarks';
-import * as parsers from 'shared/commands/parsers';
-import * as properties from 'shared/settings/properties';
-
-const openCommand = async(url) => {
-  let got = await browser.tabs.query({
-    active: true, currentWindow: true
-  });
-  if (got.length > 0) {
-    return browser.tabs.update(got[0].id, { url: url });
-  }
-};
-
-const tabopenCommand = (url) => {
-  return browser.tabs.create({ url: url });
-};
-
-const tabcloseCommand = async() => {
-  let got = await browser.tabs.query({
-    active: true, currentWindow: true
-  });
-  return browser.tabs.remove(got.map(tab => tab.id));
-};
-
-const tabcloseAllCommand = () => {
-  return browser.tabs.query({
-    currentWindow: true
-  }).then((tabList) => {
-    return browser.tabs.remove(tabList.map(tab => tab.id));
-  });
-};
-
-const winopenCommand = (url) => {
-  return browser.windows.create({ url });
-};
-
-const bufferCommand = async(keywords) => {
-  if (keywords.length === 0) {
-    return;
-  }
-  let keywordsStr = keywords.join(' ');
-  let got = await browser.tabs.query({
-    active: true, currentWindow: true
-  });
-  if (got.length === 0) {
-    return;
-  }
-  if (isNaN(keywordsStr)) {
-    return tabs.selectByKeyword(got[0], keywordsStr);
-  }
-  let index = parseInt(keywordsStr, 10) - 1;
-  return tabs.selectAt(index);
-};
-
-const addbookmarkCommand = async(tab, args) => {
-  if (!args[0]) {
-    return { type: '' };
-  }
-  let item = await bookmarks.create(args.join(' '), tab.url);
-  if (!item) {
-    return consoleActions.error(tab, 'Could not create a bookmark');
-  }
-  return consoleActions.info(tab, 'Saved current page: ' + item.url);
-};
-
-const setCommand = (args) => {
-  if (!args[0]) {
-    return { type: '' };
-  }
-
-  let [name, value] = parsers.parseSetOption(args[0], properties.types);
-  return {
-    type: actions.SETTING_SET_PROPERTY,
-    name,
-    value
-  };
-};
-
-// eslint-disable-next-line complexity, max-lines-per-function
-const doExec = async(tab, line, settings) => {
-  let [name, args] = parsers.parseCommandLine(line);
-
-  switch (name) {
-  case 'o':
-  case 'open':
-    await openCommand(parsers.normalizeUrl(args, settings.search));
-    break;
-  case 't':
-  case 'tabopen':
-    await tabopenCommand(parsers.normalizeUrl(args, settings.search));
-    break;
-  case 'w':
-  case 'winopen':
-    await winopenCommand(parsers.normalizeUrl(args, settings.search));
-    break;
-  case 'b':
-  case 'buffer':
-    await bufferCommand(args);
-    break;
-  case 'bd':
-  case 'bdel':
-  case 'bdelete':
-    await tabs.closeTabByKeywords(args.join(' '));
-    break;
-  case 'bd!':
-  case 'bdel!':
-  case 'bdelete!':
-    await tabs.closeTabByKeywordsForce(args.join(' '));
-    break;
-  case 'bdeletes':
-    await tabs.closeTabsByKeywords(args.join(' '));
-    break;
-  case 'bdeletes!':
-    await tabs.closeTabsByKeywordsForce(args.join(' '));
-    break;
-  case 'addbookmark':
-    return addbookmarkCommand(tab, args);
-  case 'set':
-    return setCommand(args);
-  case 'q':
-  case 'quit':
-    await tabcloseCommand();
-    break;
-  case 'qa':
-  case 'quitall':
-    await tabcloseAllCommand();
-    break;
-  default:
-    return consoleActions.error(tab, name + ' command is not defined');
-  }
-  return { type: '' };
-};
-
-// eslint-disable-next-line complexity
-const exec = async(tab, line, settings) => {
-  try {
-    let action = await doExec(tab, line, settings);
-    return action;
-  } catch (e) {
-    return consoleActions.error(tab, e.toString());
-  }
-};
-
-export { exec };
diff --git a/src/background/actions/console.js b/src/background/actions/console.js
deleted file mode 100644
index d385b2d..0000000
--- a/src/background/actions/console.js
+++ /dev/null
@@ -1,41 +0,0 @@
-import messages from 'shared/messages';
-
-const error = async(tab, text) => {
-  await browser.tabs.sendMessage(tab.id, {
-    type: messages.CONSOLE_SHOW_ERROR,
-    text,
-  });
-  return { type: '' };
-};
-
-const info = async(tab, text) => {
-  await browser.tabs.sendMessage(tab.id, {
-    type: messages.CONSOLE_SHOW_INFO,
-    text,
-  });
-  return { type: '' };
-};
-
-const showCommand = async(tab, command) => {
-  await browser.tabs.sendMessage(tab.id, {
-    type: messages.CONSOLE_SHOW_COMMAND,
-    command,
-  });
-  return { type: '' };
-};
-
-const showFind = async(tab) => {
-  await browser.tabs.sendMessage(tab.id, {
-    type: messages.CONSOLE_SHOW_FIND
-  });
-  return { type: '' };
-};
-
-const hide = async(tab) => {
-  await browser.tabs.sendMessage(tab.id, {
-    type: messages.CONSOLE_HIDE,
-  });
-  return { type: '' };
-};
-
-export { error, info, showCommand, showFind, hide };
diff --git a/src/background/actions/find.js b/src/background/actions/find.js
deleted file mode 100644
index 8da5572..0000000
--- a/src/background/actions/find.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import actions from './index';
-
-const setKeyword = (keyword) => {
-  return {
-    type: actions.FIND_SET_KEYWORD,
-    keyword,
-  };
-};
-
-export { setKeyword };
diff --git a/src/background/actions/index.js b/src/background/actions/index.js
deleted file mode 100644
index 3833389..0000000
--- a/src/background/actions/index.js
+++ /dev/null
@@ -1,11 +0,0 @@
-export default {
-  // Settings
-  SETTING_SET_SETTINGS: 'setting.set.settings',
-  SETTING_SET_PROPERTY: 'setting.set.property',
-
-  // Find
-  FIND_SET_KEYWORD: 'find.set.keyword',
-
-  // Tab
-  TAB_SELECTED: 'tab.selected',
-};
diff --git a/src/background/actions/setting.js b/src/background/actions/setting.js
deleted file mode 100644
index 7eeb5de..0000000
--- a/src/background/actions/setting.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import actions from '../actions';
-import * as settingsStorage from 'shared/settings/storage';
-
-const load = async() => {
-  let value = await settingsStorage.loadValue();
-  return {
-    type: actions.SETTING_SET_SETTINGS,
-    value,
-  };
-};
-
-const setProperty = (name, value) => {
-  return {
-    type: actions.SETTING_SET_PROPERTY,
-    name,
-    value,
-  };
-};
-
-export { load, setProperty };
diff --git a/src/background/actions/tab.js b/src/background/actions/tab.js
deleted file mode 100644
index 0f32a90..0000000
--- a/src/background/actions/tab.js
+++ /dev/null
@@ -1,34 +0,0 @@
-import actions from './index';
-
-const openNewTab = async(
-  url, openerTabId, background = false, adjacent = false
-) => {
-  if (!adjacent) {
-    await browser.tabs.create({ url, active: !background });
-    return { type: '' };
-  }
-  let tabs = await browser.tabs.query({
-    active: true, currentWindow: true
-  });
-  await browser.tabs.create({
-    url,
-    openerTabId,
-    active: !background,
-    index: tabs[0].index + 1
-  });
-  return { type: '' };
-};
-
-const openToTab = async(url, tab) => {
-  await browser.tabs.update(tab.id, { url: url });
-  return { type: '' };
-};
-
-const selected = (tabId) => {
-  return {
-    type: actions.TAB_SELECTED,
-    tabId,
-  };
-};
-
-export { openNewTab, openToTab, selected };
diff --git a/src/background/components/background.js b/src/background/components/background.js
deleted file mode 100644
index c7a79a1..0000000
--- a/src/background/components/background.js
+++ /dev/null
@@ -1,67 +0,0 @@
-import messages from 'shared/messages';
-import * as commandActions from 'background/actions/command';
-import * as settingActions from 'background/actions/setting';
-import * as findActions from 'background/actions/find';
-import * as tabActions from 'background/actions/tab';
-import * as completions from '../shared/completions';
-
-export default class BackgroundComponent {
-  constructor(store) {
-    this.store = store;
-
-    browser.runtime.onMessage.addListener((message, sender) => {
-      try {
-        return this.onMessage(message, sender);
-      } catch (e) {
-        return browser.tabs.sendMessage(sender.tab.id, {
-          type: messages.CONSOLE_SHOW_ERROR,
-          text: e.message,
-        });
-      }
-    });
-  }
-
-  onMessage(message, sender) {
-    let settings = this.store.getState().setting;
-    let find = this.store.getState().find;
-
-    switch (message.type) {
-    case messages.OPEN_URL:
-      if (message.newTab) {
-        let action = tabActions.openNewTab(
-          message.url, sender.tab.id, message.background,
-          settings.value.properties.adjacenttab);
-        return this.store.dispatch(action, sender);
-      }
-      return this.store.dispatch(
-        tabActions.openToTab(message.url, sender.tab), sender);
-    case messages.CONSOLE_ENTER_COMMAND:
-      this.store.dispatch(
-        commandActions.exec(sender.tab, message.text, settings.value),
-        sender
-      );
-      return this.broadcastSettingsChanged();
-    case messages.SETTINGS_QUERY:
-      return Promise.resolve(this.store.getState().setting.value);
-    case messages.CONSOLE_QUERY_COMPLETIONS:
-      return completions.complete(message.text, settings.value);
-    case messages.SETTINGS_RELOAD:
-      this.store.dispatch(settingActions.load());
-      return this.broadcastSettingsChanged();
-    case messages.FIND_GET_KEYWORD:
-      return Promise.resolve(find.keyword);
-    case messages.FIND_SET_KEYWORD:
-      this.store.dispatch(findActions.setKeyword(message.keyword));
-      return Promise.resolve({});
-    }
-  }
-
-  async broadcastSettingsChanged() {
-    let tabs = await browser.tabs.query({});
-    for (let tab of tabs) {
-      browser.tabs.sendMessage(tab.id, {
-        type: messages.SETTINGS_CHANGED,
-      });
-    }
-  }
-}
diff --git a/src/background/components/indicator.js b/src/background/components/indicator.js
deleted file mode 100644
index 1ded329..0000000
--- a/src/background/components/indicator.js
+++ /dev/null
@@ -1,43 +0,0 @@
-import * as indicators from '../shared/indicators';
-import messages from 'shared/messages';
-
-export default class IndicatorComponent {
-  constructor(store) {
-    this.store = store;
-
-    messages.onMessage(this.onMessage.bind(this));
-
-    browser.browserAction.onClicked.addListener(this.onClicked);
-    browser.tabs.onActivated.addListener(async(info) => {
-      await browser.tabs.query({ currentWindow: true });
-      return this.onTabActivated(info);
-    });
-  }
-
-  async onTabActivated(info) {
-    let { enabled } = await browser.tabs.sendMessage(info.tabId, {
-      type: messages.ADDON_ENABLED_QUERY,
-    });
-    return this.updateIndicator(enabled);
-  }
-
-  onClicked(tab) {
-    browser.tabs.sendMessage(tab.id, {
-      type: messages.ADDON_TOGGLE_ENABLED,
-    });
-  }
-
-  onMessage(message) {
-    switch (message.type) {
-    case messages.ADDON_ENABLED_RESPONSE:
-      return this.updateIndicator(message.enabled);
-    }
-  }
-
-  updateIndicator(enabled) {
-    if (enabled) {
-      return indicators.enable();
-    }
-    return indicators.disable();
-  }
-}
diff --git a/src/background/components/operation.js b/src/background/components/operation.js
deleted file mode 100644
index ce93270..0000000
--- a/src/background/components/operation.js
+++ /dev/null
@@ -1,127 +0,0 @@
-import messages from 'shared/messages';
-import operations from 'shared/operations';
-import * as tabs from '../shared//tabs';
-import * as zooms from '../shared/zooms';
-import * as consoleActions from '../actions/console';
-
-export default class BackgroundComponent {
-  constructor(store) {
-    this.store = store;
-
-    browser.runtime.onMessage.addListener((message, sender) => {
-      try {
-        return this.onMessage(message, sender);
-      } catch (e) {
-        return browser.tabs.sendMessage(sender.tab.id, {
-          type: messages.CONSOLE_SHOW_ERROR,
-          text: e.message,
-        });
-      }
-    });
-  }
-
-  onMessage(message, sender) {
-    switch (message.type) {
-    case messages.BACKGROUND_OPERATION:
-      return this.store.dispatch(
-        this.exec(message.operation, sender.tab));
-    }
-  }
-
-  // eslint-disable-next-line complexity, max-lines-per-function
-  async exec(operation, tab) {
-    let tabState = this.store.getState().tab;
-
-    switch (operation.type) {
-    case operations.TAB_CLOSE:
-      await tabs.closeTab(tab.id);
-      break;
-    case operations.TAB_CLOSE_FORCE:
-      await tabs.closeTabForce(tab.id);
-      break;
-    case operations.TAB_REOPEN:
-      await tabs.reopenTab();
-      break;
-    case operations.TAB_PREV:
-      await tabs.selectPrevTab(tab.index, operation.count);
-      break;
-    case operations.TAB_NEXT:
-      await tabs.selectNextTab(tab.index, operation.count);
-      break;
-    case operations.TAB_FIRST:
-      await tabs.selectFirstTab();
-      break;
-    case operations.TAB_LAST:
-      await tabs.selectLastTab();
-      break;
-    case operations.TAB_PREV_SEL:
-      if (tabState.previousSelected > 0) {
-        await tabs.selectTab(tabState.previousSelected);
-      }
-      break;
-    case operations.TAB_RELOAD:
-      await tabs.reload(tab, operation.cache);
-      break;
-    case operations.TAB_PIN:
-      await tabs.updateTabPinned(tab, true);
-      break;
-    case operations.TAB_UNPIN:
-      await tabs.updateTabPinned(tab, false);
-      break;
-    case operations.TAB_TOGGLE_PINNED:
-      await tabs.toggleTabPinned(tab);
-      break;
-    case operations.TAB_DUPLICATE:
-      await tabs.duplicate(tab.id);
-      break;
-    case operations.ZOOM_IN:
-      await zooms.zoomIn();
-      break;
-    case operations.ZOOM_OUT:
-      await zooms.zoomOut();
-      break;
-    case operations.ZOOM_NEUTRAL:
-      await zooms.neutral();
-      break;
-    case operations.COMMAND_SHOW:
-      return consoleActions.showCommand(tab, '');
-    case operations.COMMAND_SHOW_OPEN:
-      if (operation.alter) {
-        // alter url
-        return consoleActions.showCommand(tab, 'open ' + tab.url);
-      }
-      return consoleActions.showCommand(tab, 'open ');
-    case operations.COMMAND_SHOW_TABOPEN:
-      if (operation.alter) {
-        // alter url
-        return consoleActions.showCommand(tab, 'tabopen ' + tab.url);
-      }
-      return consoleActions.showCommand(tab, 'tabopen ');
-    case operations.COMMAND_SHOW_WINOPEN:
-      if (operation.alter) {
-        // alter url
-        return consoleActions.showCommand(tab, 'winopen ' + tab.url);
-      }
-      return consoleActions.showCommand(tab, 'winopen ');
-    case operations.COMMAND_SHOW_BUFFER:
-      return consoleActions.showCommand(tab, 'buffer ');
-    case operations.COMMAND_SHOW_ADDBOOKMARK:
-      if (operation.alter) {
-        return consoleActions.showCommand(tab, 'addbookmark ' + tab.title);
-      }
-      return consoleActions.showCommand(tab, 'addbookmark  ');
-    case operations.FIND_START:
-      return consoleActions.showFind(tab);
-    case operations.CANCEL:
-      return consoleActions.hide(tab);
-    case operations.PAGE_SOURCE:
-      await browser.tabs.create({
-        url: 'view-source:' + tab.url,
-        index: tab.index + 1,
-        openerTabId: tab.id,
-      });
-      break;
-    }
-    return { type: '' };
-  }
-}
diff --git a/src/background/components/tab.js b/src/background/components/tab.js
deleted file mode 100644
index 6af3fd7..0000000
--- a/src/background/components/tab.js
+++ /dev/null
@@ -1,16 +0,0 @@
-import * as tabActions from '../actions/tab';
-
-export default class TabComponent {
-  constructor(store) {
-    this.store = store;
-
-    browser.tabs.onActivated.addListener(async(info) => {
-      await browser.tabs.query({ currentWindow: true });
-      return this.onTabActivated(info);
-    });
-  }
-
-  onTabActivated(info) {
-    return this.store.dispatch(tabActions.selected(info.tabId));
-  }
-}
diff --git a/src/background/controllers/addon-enabled.js b/src/background/controllers/addon-enabled.js
new file mode 100644
index 0000000..6a9b776
--- /dev/null
+++ b/src/background/controllers/addon-enabled.js
@@ -0,0 +1,11 @@
+import AddonEnabledInteractor from '../usecases/addon-enabled';
+
+export default class AddonEnabledController {
+  constructor() {
+    this.addonEnabledInteractor = new AddonEnabledInteractor();
+  }
+
+  indicate(enabled) {
+    return this.addonEnabledInteractor.indicate(enabled);
+  }
+}
diff --git a/src/background/controllers/command.js b/src/background/controllers/command.js
new file mode 100644
index 0000000..befab42
--- /dev/null
+++ b/src/background/controllers/command.js
@@ -0,0 +1,94 @@
+import CompletionsInteractor from '../usecases/completions';
+import CommandInteractor from '../usecases/command';
+import Completions from '../domains/completions';
+
+export default class CommandController {
+  constructor() {
+    this.completionsInteractor = new CompletionsInteractor();
+    this.commandIndicator = new CommandInteractor();
+  }
+
+  getCompletions(line) {
+    let trimmed = line.trimStart();
+    let words = trimmed.split(/ +/);
+    let name = words[0];
+    if (words.length === 1) {
+      return this.completionsInteractor.queryConsoleCommand(name);
+    }
+    let keywords = trimmed.slice(name.length).trimStart();
+    switch (words[0]) {
+    case 'o':
+    case 'open':
+    case 't':
+    case 'tabopen':
+    case 'w':
+    case 'winopen':
+      return this.completionsInteractor.queryOpen(name, keywords);
+    case 'b':
+    case 'buffer':
+      return this.completionsInteractor.queryBuffer(name, keywords);
+    case 'bd':
+    case 'bdel':
+    case 'bdelete':
+    case 'bdeletes':
+      return this.completionsInteractor.queryBdelete(name, keywords);
+    case 'bd!':
+    case 'bdel!':
+    case 'bdelete!':
+    case 'bdeletes!':
+      return this.completionsInteractor.queryBdeleteForce(name, keywords);
+    case 'set':
+      return this.completionsInteractor.querySet(name, keywords);
+    }
+    return Promise.resolve(Completions.empty());
+  }
+
+  // eslint-disable-next-line complexity
+  exec(line) {
+    let trimmed = line.trimStart();
+    let words = trimmed.split(/ +/);
+    let name = words[0];
+    if (words[0].length === 0) {
+      return Promise.resolve();
+    }
+
+    let keywords = trimmed.slice(name.length).trimStart();
+    switch (words[0]) {
+    case 'o':
+    case 'open':
+      return this.commandIndicator.open(keywords);
+    case 't':
+    case 'tabopen':
+      return this.commandIndicator.tabopen(keywords);
+    case 'w':
+    case 'winopen':
+      return this.commandIndicator.winopen(keywords);
+    case 'b':
+    case 'buffer':
+      return this.commandIndicator.buffer(keywords);
+    case 'bd':
+    case 'bdel':
+    case 'bdelete':
+      return this.commandIndicator.bdelete(false, keywords);
+    case 'bd!':
+    case 'bdel!':
+    case 'bdelete!':
+      return this.commandIndicator.bdelete(true, keywords);
+    case 'bdeletes':
+      return this.commandIndicator.bdeletes(false, keywords);
+    case 'bdeletes!':
+      return this.commandIndicator.bdeletes(true, keywords);
+    case 'addbookmark':
+      return this.commandIndicator.addbookmark(keywords);
+    case 'q':
+    case 'quit':
+      return this.commandIndicator.quit();
+    case 'qa':
+    case 'quitall':
+      return this.commandIndicator.quitAll();
+    case 'set':
+      return this.commandIndicator.set(keywords);
+    }
+    throw new Error(words[0] + ' command is not defined');
+  }
+}
diff --git a/src/background/controllers/find.js b/src/background/controllers/find.js
new file mode 100644
index 0000000..7096014
--- /dev/null
+++ b/src/background/controllers/find.js
@@ -0,0 +1,15 @@
+import FindInteractor from '../usecases/find';
+
+export default class FindController {
+  constructor() {
+    this.findInteractor = new FindInteractor();
+  }
+
+  getKeyword() {
+    return this.findInteractor.getKeyword();
+  }
+
+  setKeyword(keyword) {
+    return this.findInteractor.setKeyword(keyword);
+  }
+}
diff --git a/src/background/controllers/link.js b/src/background/controllers/link.js
new file mode 100644
index 0000000..7ebbb34
--- /dev/null
+++ b/src/background/controllers/link.js
@@ -0,0 +1,15 @@
+import LinkInteractor from '../usecases/link';
+
+export default class LinkController {
+  constructor() {
+    this.linkInteractor = new LinkInteractor();
+  }
+
+  openToTab(url, tabId) {
+    this.linkInteractor.openToTab(url, tabId);
+  }
+
+  openNewTab(url, openerId, background) {
+    this.linkInteractor.openNewTab(url, openerId, background);
+  }
+}
diff --git a/src/background/controllers/operation.js b/src/background/controllers/operation.js
new file mode 100644
index 0000000..1339006
--- /dev/null
+++ b/src/background/controllers/operation.js
@@ -0,0 +1,65 @@
+import operations from '../../shared/operations';
+import OperationInteractor from '../usecases/operation';
+
+export default class OperationController {
+  constructor() {
+    this.operationInteractor = new OperationInteractor();
+  }
+
+  // eslint-disable-next-line complexity, max-lines-per-function
+  exec(operation) {
+    switch (operation.type) {
+    case operations.TAB_CLOSE:
+      return this.operationInteractor.close(false);
+    case operations.TAB_CLOSE_FORCE:
+      return this.operationInteractor.close(true);
+    case operations.TAB_REOPEN:
+      return this.operationInteractor.reopen();
+    case operations.TAB_PREV:
+      return this.operationInteractor.selectPrev(1);
+    case operations.TAB_NEXT:
+      return this.operationInteractor.selectNext(1);
+    case operations.TAB_FIRST:
+      return this.operationInteractor.selectFirst();
+    case operations.TAB_LAST:
+      return this.operationInteractor.selectLast();
+    case operations.TAB_PREV_SEL:
+      return this.operationInteractor.selectPrevSelected();
+    case operations.TAB_RELOAD:
+      return this.operationInteractor.reload(operation.cache);
+    case operations.TAB_PIN:
+      return this.operationInteractor.setPinned(true);
+    case operations.TAB_UNPIN:
+      return this.operationInteractor.setPinned(false);
+    case operations.TAB_TOGGLE_PINNED:
+      return this.operationInteractor.togglePinned();
+    case operations.TAB_DUPLICATE:
+      return this.operationInteractor.duplicate();
+    case operations.PAGE_SOURCE:
+      return this.operationInteractor.openPageSource();
+    case operations.ZOOM_IN:
+      return this.operationInteractor.zoomIn();
+    case operations.ZOOM_OUT:
+      return this.operationInteractor.zoomOut();
+    case operations.ZOOM_NEUTRAL:
+      return this.operationInteractor.zoomNutoral();
+    case operations.COMMAND_SHOW:
+      return this.operationInteractor.showCommand();
+    case operations.COMMAND_SHOW_OPEN:
+      return this.operationInteractor.showOpenCommand(operation.alter);
+    case operations.COMMAND_SHOW_TABOPEN:
+      return this.operationInteractor.showTabopenCommand(operation.alter);
+    case operations.COMMAND_SHOW_WINOPEN:
+      return this.operationInteractor.showWinopenCommand(operation.alter);
+    case operations.COMMAND_SHOW_BUFFER:
+      return this.operationInteractor.showBufferCommand();
+    case operations.COMMAND_SHOW_ADDBOOKMARK:
+      return this.operationInteractor.showAddbookmarkCommand(operation.alter);
+    case operations.FIND_START:
+      return this.operationInteractor.findStart();
+    case operations.CANCEL:
+      return this.operationInteractor.hideConsole();
+    }
+  }
+}
+
diff --git a/src/background/controllers/setting.js b/src/background/controllers/setting.js
new file mode 100644
index 0000000..9e6019e
--- /dev/null
+++ b/src/background/controllers/setting.js
@@ -0,0 +1,18 @@
+import SettingInteractor from '../usecases/setting';
+import ContentMessageClient from '../infrastructures/content-message-client';
+
+export default class SettingController {
+  constructor() {
+    this.settingInteractor = new SettingInteractor();
+    this.contentMessageClient = new ContentMessageClient();
+  }
+
+  getSetting() {
+    return this.settingInteractor.get();
+  }
+
+  async reload() {
+    await this.settingInteractor.reload();
+    this.contentMessageClient.broadcastSettingsChanged();
+  }
+}
diff --git a/src/background/controllers/version.js b/src/background/controllers/version.js
new file mode 100644
index 0000000..04d99fe
--- /dev/null
+++ b/src/background/controllers/version.js
@@ -0,0 +1,11 @@
+import VersionInteractor from '../usecases/version';
+
+export default class VersionController {
+  constructor() {
+    this.versionInteractor = new VersionInteractor();
+  }
+
+  notifyIfUpdated() {
+    this.versionInteractor.notifyIfUpdated();
+  }
+}
diff --git a/src/shared/commands/docs.js b/src/background/domains/command-docs.js
index c73eb71..0b8ede7 100644
--- a/src/shared/commands/docs.js
+++ b/src/background/domains/command-docs.js
@@ -9,3 +9,4 @@ export default {
   quit: 'Close the current tab',
   quitall: 'Close all tabs',
 };
+
diff --git a/src/background/domains/completion-group.js b/src/background/domains/completion-group.js
new file mode 100644
index 0000000..1749d72
--- /dev/null
+++ b/src/background/domains/completion-group.js
@@ -0,0 +1,14 @@
+export default class CompletionGroup {
+  constructor(name, items) {
+    this.name0 = name;
+    this.items0 = items;
+  }
+
+  get name() {
+    return this.name0;
+  }
+
+  get items() {
+    return this.items0;
+  }
+}
diff --git a/src/background/domains/completion-item.js b/src/background/domains/completion-item.js
new file mode 100644
index 0000000..c7ad8a1
--- /dev/null
+++ b/src/background/domains/completion-item.js
@@ -0,0 +1,24 @@
+export default class CompletionItem {
+  constructor({ caption, content, url, icon }) {
+    this.caption0 = caption;
+    this.content0 = content;
+    this.url0 = url;
+    this.icon0 = icon;
+  }
+
+  get caption() {
+    return this.caption0;
+  }
+
+  get content() {
+    return this.content0;
+  }
+
+  get url() {
+    return this.url0;
+  }
+
+  get icon() {
+    return this.icon0;
+  }
+}
diff --git a/src/background/domains/completions.js b/src/background/domains/completions.js
new file mode 100644
index 0000000..4e4219f
--- /dev/null
+++ b/src/background/domains/completions.js
@@ -0,0 +1,27 @@
+export default class Completions {
+  constructor(groups) {
+    this.g = groups;
+  }
+
+  get groups() {
+    return this.g;
+  }
+
+  serialize() {
+    return this.groups.map(group => ({
+      name: group.name,
+      items: group.items.map(item => ({
+        caption: item.caption,
+        content: item.content,
+        url: item.url,
+        icon: item.icon,
+      })),
+    }));
+  }
+
+  static EMPTY_COMPLETIONS = new Completions([]);
+
+  static empty() {
+    return Completions.EMPTY_COMPLETIONS;
+  }
+}
diff --git a/src/background/domains/setting.js b/src/background/domains/setting.js
new file mode 100644
index 0000000..106ec0f
--- /dev/null
+++ b/src/background/domains/setting.js
@@ -0,0 +1,51 @@
+import DefaultSettings from '../../shared/settings/default';
+import * as settingsValues from '../../shared/settings/values';
+
+export default class Setting {
+  constructor({ source, json, form }) {
+    this.obj = {
+      source, json, form
+    };
+  }
+
+  get source() {
+    return this.obj.source;
+  }
+
+  get json() {
+    return this.obj.json;
+  }
+
+  get form() {
+    return this.obj.form;
+  }
+
+  value() {
+    let value = JSON.parse(DefaultSettings.json);
+    if (this.obj.source === 'json') {
+      value = settingsValues.valueFromJson(this.obj.json);
+    } else if (this.obj.source === 'form') {
+      value = settingsValues.valueFromForm(this.obj.form);
+    }
+    if (!value.properties) {
+      value.properties = {};
+    }
+    return { ...settingsValues.valueFromJson(DefaultSettings.json), ...value };
+  }
+
+  serialize() {
+    return this.obj;
+  }
+
+  static deserialize(obj) {
+    return new Setting({ source: obj.source, json: obj.json, form: obj.form });
+  }
+
+  static defaultSettings() {
+    return new Setting({
+      source: DefaultSettings.source,
+      json: DefaultSettings.json,
+      form: {},
+    });
+  }
+}
diff --git a/src/background/index.js b/src/background/index.js
index 1e4c078..30007a9 100644
--- a/src/background/index.js
+++ b/src/background/index.js
@@ -1,34 +1,8 @@
-import * as settingActions from 'background/actions/setting';
-import BackgroundComponent from 'background/components/background';
-import OperationComponent from 'background/components/operation';
-import TabComponent from 'background/components/tab';
-import IndicatorComponent from 'background/components/indicator';
-import reducers from 'background/reducers';
-import { createStore, applyMiddleware } from 'redux';
-import promise from 'redux-promise';
-import * as versions from './shared/versions';
+import ContentMessageListener from './infrastructures/content-message-listener';
+import SettingController from './controllers/setting';
+import VersionController from './controllers/version';
 
-const store = createStore(
-  reducers,
-  applyMiddleware(promise),
-);
+new SettingController().reload();
+new VersionController().notifyIfUpdated();
 
-const checkAndNotifyUpdated = async() => {
-  let updated = await versions.checkUpdated();
-  if (!updated) {
-    return;
-  }
-  await versions.notify();
-  await versions.commit();
-};
-
-/* eslint-disable no-unused-vars */
-const backgroundComponent = new BackgroundComponent(store);
-const operationComponent = new OperationComponent(store);
-const tabComponent = new TabComponent(store);
-const indicatorComponent = new IndicatorComponent(store);
-/* eslint-enable no-unused-vars */
-
-store.dispatch(settingActions.load());
-
-checkAndNotifyUpdated();
+new ContentMessageListener().run();
diff --git a/src/background/infrastructures/content-message-client.js b/src/background/infrastructures/content-message-client.js
new file mode 100644
index 0000000..d659560
--- /dev/null
+++ b/src/background/infrastructures/content-message-client.js
@@ -0,0 +1,25 @@
+import messages from '../../shared/messages';
+
+export default class ContentMessageClient {
+  async broadcastSettingsChanged() {
+    let tabs = await browser.tabs.query({});
+    for (let tab of tabs) {
+      browser.tabs.sendMessage(tab.id, {
+        type: messages.SETTINGS_CHANGED,
+      });
+    }
+  }
+
+  async getAddonEnabled(tabId) {
+    let { enabled } = await browser.tabs.sendMessage(tabId, {
+      type: messages.ADDON_ENABLED_QUERY,
+    });
+    return enabled;
+  }
+
+  toggleAddonEnabled(tabId) {
+    return browser.tabs.sendMessage(tabId, {
+      type: messages.ADDON_TOGGLE_ENABLED,
+    });
+  }
+}
diff --git a/src/background/infrastructures/content-message-listener.js b/src/background/infrastructures/content-message-listener.js
new file mode 100644
index 0000000..58716fb
--- /dev/null
+++ b/src/background/infrastructures/content-message-listener.js
@@ -0,0 +1,101 @@
+import messages from '../../shared/messages';
+import CommandController from '../controllers/command';
+import SettingController from '../controllers/setting';
+import FindController from '../controllers/find';
+import AddonEnabledController from '../controllers/addon-enabled';
+import LinkController from '../controllers/link';
+import OperationController from '../controllers/operation';
+
+export default class ContentMessageListener {
+  constructor() {
+    this.settingController = new SettingController();
+    this.commandController = new CommandController();
+    this.findController = new FindController();
+    this.addonEnabledController = new AddonEnabledController();
+    this.linkController = new LinkController();
+    this.backgroundOperationController = new OperationController();
+  }
+
+  run() {
+    browser.runtime.onMessage.addListener((message, sender) => {
+      try {
+        return this.onMessage(message, sender).catch((e) => {
+          return browser.tabs.sendMessage(sender.tab.id, {
+            type: messages.CONSOLE_SHOW_ERROR,
+            text: e.message,
+          });
+        });
+      } catch (e) {
+        return browser.tabs.sendMessage(sender.tab.id, {
+          type: messages.CONSOLE_SHOW_ERROR,
+          text: e.message,
+        });
+      }
+    });
+  }
+
+  onMessage(message, sender) {
+    switch (message.type) {
+    case messages.CONSOLE_QUERY_COMPLETIONS:
+      return this.onConsoleQueryCompletions(message.text);
+    case messages.CONSOLE_ENTER_COMMAND:
+      return this.onConsoleEnterCommand(message.text);
+    case messages.SETTINGS_QUERY:
+      return this.onSettingsQuery();
+    case messages.SETTINGS_RELOAD:
+      return this.onSettingsReload();
+    case messages.FIND_GET_KEYWORD:
+      return this.onFindGetKeyword();
+    case messages.FIND_SET_KEYWORD:
+      return this.onFindSetKeyword(message.keyword);
+    case messages.ADDON_ENABLED_RESPONSE:
+      return this.onAddonEnabledResponse(message.enabled);
+    case messages.OPEN_URL:
+      return this.onOpenUrl(
+        message.newTab, message.url, sender.tab.id, message.background);
+    case messages.BACKGROUND_OPERATION:
+      return this.onBackgroundOperation(message.operation);
+    }
+  }
+
+  async onConsoleQueryCompletions(line) {
+    let completions = await this.commandController.getCompletions(line);
+    return Promise.resolve(completions.serialize());
+  }
+
+  onConsoleEnterCommand(text) {
+    return this.commandController.exec(text);
+  }
+
+
+  onSettingsQuery() {
+    return this.settingController.getSetting();
+  }
+
+  onSettingsReload() {
+    return this.settingController.reload();
+  }
+
+  onFindGetKeyword() {
+    return this.findController.getKeyword();
+  }
+
+  onFindSetKeyword(keyword) {
+    return this.findController.setKeyword(keyword);
+  }
+
+  onAddonEnabledResponse(enabled) {
+    return this.addonEnabledController.indicate(enabled);
+  }
+
+  onOpenUrl(newTab, url, openerId, background) {
+    if (newTab) {
+      return this.linkController.openNewTab(url, openerId, background);
+    }
+    return this.linkController.openToTab(url, openerId);
+  }
+
+  onBackgroundOperation(operation) {
+    return this.backgroundOperationController.exec(operation);
+  }
+}
diff --git a/src/background/infrastructures/memory-storage.js b/src/background/infrastructures/memory-storage.js
new file mode 100644
index 0000000..3a7e4f2
--- /dev/null
+++ b/src/background/infrastructures/memory-storage.js
@@ -0,0 +1,19 @@
+const db = {};
+
+export default class MemoryStorage {
+  set(name, value) {
+    let data = JSON.stringify(value);
+    if (typeof data === 'undefined') {
+      throw new Error('value is not serializable');
+    }
+    db[name] = data;
+  }
+
+  get(name) {
+    let data = db[name];
+    if (!data) {
+      return undefined;
+    }
+    return JSON.parse(data);
+  }
+}
diff --git a/src/background/infrastructures/notifier.js b/src/background/infrastructures/notifier.js
new file mode 100644
index 0000000..1eccc47
--- /dev/null
+++ b/src/background/infrastructures/notifier.js
@@ -0,0 +1,23 @@
+const NOTIFICATION_ID = 'vimvixen-update';
+
+export default class Notifier {
+  notify(title, message, onclick) {
+    const listener = (id) => {
+      if (id !== NOTIFICATION_ID) {
+        return;
+      }
+
+      onclick();
+
+      browser.notifications.onClicked.removeListener(listener);
+    };
+    browser.notifications.onClicked.addListener(listener);
+
+    return browser.notifications.create(NOTIFICATION_ID, {
+      'type': 'basic',
+      'iconUrl': browser.extension.getURL('resources/icon_48x48.png'),
+      title,
+      message,
+    });
+  }
+}
diff --git a/src/background/presenters/console.js b/src/background/presenters/console.js
new file mode 100644
index 0000000..8259238
--- /dev/null
+++ b/src/background/presenters/console.js
@@ -0,0 +1,36 @@
+import messages from '../../shared/messages';
+
+export default class ConsolePresenter {
+  showCommand(tabId, command) {
+    return browser.tabs.sendMessage(tabId, {
+      type: messages.CONSOLE_SHOW_COMMAND,
+      command,
+    });
+  }
+
+  showFind(tabId) {
+    return browser.tabs.sendMessage(tabId, {
+      type: messages.CONSOLE_SHOW_FIND
+    });
+  }
+
+  showInfo(tabId, message) {
+    return browser.tabs.sendMessage(tabId, {
+      type: messages.CONSOLE_SHOW_INFO,
+      text: message,
+    });
+  }
+
+  showError(tabId, message) {
+    return browser.tabs.sendMessage(tabId, {
+      type: messages.CONSOLE_SHOW_ERROR,
+      text: message,
+    });
+  }
+
+  hide(tabId) {
+    return browser.tabs.sendMessage(tabId, {
+      type: messages.CONSOLE_HIDE,
+    });
+  }
+}
diff --git a/src/background/presenters/indicator.js b/src/background/presenters/indicator.js
new file mode 100644
index 0000000..5737519
--- /dev/null
+++ b/src/background/presenters/indicator.js
@@ -0,0 +1,12 @@
+export default class IndicatorPresenter {
+  indicate(enabled) {
+    let path = enabled
+      ? 'resources/enabled_32x32.png'
+      : 'resources/disabled_32x32.png';
+    return browser.browserAction.setIcon({ path });
+  }
+
+  onClick(listener) {
+    browser.browserAction.onClicked.addListener(listener);
+  }
+}
diff --git a/src/background/presenters/tab.js b/src/background/presenters/tab.js
new file mode 100644
index 0000000..2a06a5a
--- /dev/null
+++ b/src/background/presenters/tab.js
@@ -0,0 +1,101 @@
+export default class TabPresenter {
+  open(url, tabId) {
+    return browser.tabs.update(tabId, { url });
+  }
+
+  create(url, opts) {
+    return browser.tabs.create({ url, ...opts });
+  }
+
+  async getCurrent() {
+    let tabs = await browser.tabs.query({
+      active: true, currentWindow: true
+    });
+    return tabs[0];
+  }
+
+  getAll() {
+    return browser.tabs.query({ currentWindow: true });
+  }
+
+  async getByKeyword(keyword, excludePinned = false) {
+    let tabs = await browser.tabs.query({ currentWindow: true });
+    return tabs.filter((t) => {
+      return t.url.toLowerCase().includes(keyword.toLowerCase()) ||
+        t.title && t.title.toLowerCase().includes(keyword.toLowerCase());
+    }).filter((t) => {
+      return !(excludePinned && t.pinned);
+    });
+  }
+
+  select(tabId) {
+    return browser.tabs.update(tabId, { active: true });
+  }
+
+  async selectAt(index) {
+    let tabs = await browser.tabs.query({ currentWindow: true });
+    if (tabs.length < 2) {
+      return;
+    }
+    if (index < 0 || tabs.length <= index) {
+      throw new RangeError(`tab ${index + 1} does not exist`);
+    }
+    let id = tabs[index].id;
+    return browser.tabs.update(id, { active: true });
+  }
+
+  remove(ids) {
+    return browser.tabs.remove(ids);
+  }
+
+  async reopen() {
+    let window = await browser.windows.getCurrent();
+    let sessions = await browser.sessions.getRecentlyClosed();
+    let session = sessions.find((s) => {
+      return s.tab && s.tab.windowId === window.id;
+    });
+    if (!session) {
+      return;
+    }
+    if (session.tab) {
+      return browser.sessions.restore(session.tab.sessionId);
+    }
+    return browser.sessions.restore(session.window.sessionId);
+  }
+
+  reload(tabId, cache) {
+    return browser.tabs.reload(tabId, { bypassCache: cache });
+  }
+
+  setPinned(tabId, pinned) {
+    return browser.tabs.update(tabId, { pinned });
+  }
+
+  duplicate(id) {
+    return browser.tabs.duplicate(id);
+  }
+
+  getZoom(tabId) {
+    return browser.tabs.getZoom(tabId);
+  }
+
+  setZoom(tabId, factor) {
+    return browser.tabs.setZoom(tabId, factor);
+  }
+
+  async createAdjacent(url, { openerTabId, active }) {
+    let tabs = await browser.tabs.query({
+      active: true, currentWindow: true
+    });
+    return browser.tabs.create({
+      url,
+      openerTabId,
+      active,
+      index: tabs[0].index + 1
+    });
+  }
+
+  onSelected(listener) {
+    browser.tabs.onActivated.addListener(listener);
+  }
+}
diff --git a/src/background/presenters/window.js b/src/background/presenters/window.js
new file mode 100644
index 0000000..a82c4a2
--- /dev/null
+++ b/src/background/presenters/window.js
@@ -0,0 +1,5 @@
+export default class WindowPresenter {
+  create(url) {
+    return browser.windows.create({ url });
+  }
+}
diff --git a/src/background/reducers/find.js b/src/background/reducers/find.js
deleted file mode 100644
index bbc6b36..0000000
--- a/src/background/reducers/find.js
+++ /dev/null
@@ -1,15 +0,0 @@
-import actions from 'content/actions';
-
-const defaultState = {
-  keyword: null,
-};
-
-export default function reducer(state = defaultState, action = {}) {
-  switch (action.type) {
-  case actions.FIND_SET_KEYWORD:
-    return { ...state,
-      keyword: action.keyword, };
-  default:
-    return state;
-  }
-}
diff --git a/src/background/reducers/index.js b/src/background/reducers/index.js
deleted file mode 100644
index 465f927..0000000
--- a/src/background/reducers/index.js
+++ /dev/null
@@ -1,8 +0,0 @@
-import { combineReducers } from 'redux';
-import setting from './setting';
-import find from './find';
-import tab from './tab';
-
-export default combineReducers({
-  setting, find, tab,
-});
diff --git a/src/background/reducers/setting.js b/src/background/reducers/setting.js
deleted file mode 100644
index 8dbc1b4..0000000
--- a/src/background/reducers/setting.js
+++ /dev/null
@@ -1,22 +0,0 @@
-import actions from 'background/actions';
-
-const defaultState = {
-  value: {},
-};
-
-export default function reducer(state = defaultState, action = {}) {
-  switch (action.type) {
-  case actions.SETTING_SET_SETTINGS:
-    return {
-      value: action.value,
-    };
-  case actions.SETTING_SET_PROPERTY:
-    return {
-      value: { ...state.value,
-        properties: { ...state.value.properties, [action.name]: action.value }}
-    };
-  default:
-    return state;
-  }
-}
-
diff --git a/src/background/reducers/tab.js b/src/background/reducers/tab.js
deleted file mode 100644
index e0cdf32..0000000
--- a/src/background/reducers/tab.js
+++ /dev/null
@@ -1,19 +0,0 @@
-import actions from 'background/actions';
-
-const defaultState = {
-  previousSelected: -1,
-  currentSelected: -1,
-};
-
-export default function reducer(state = defaultState, action = {}) {
-  switch (action.type) {
-  case actions.TAB_SELECTED:
-    return {
-      previousSelected: state.currentSelected,
-      currentSelected: action.tabId,
-    };
-  default:
-    return state;
-  }
-}
-
diff --git a/src/background/repositories/bookmark.js b/src/background/repositories/bookmark.js
new file mode 100644
index 0000000..99f7ec4
--- /dev/null
+++ b/src/background/repositories/bookmark.js
@@ -0,0 +1,13 @@
+export default class BookmarkRepository {
+  async create(title, url) {
+    let item = await browser.bookmarks.create({
+      type: 'bookmark',
+      title,
+      url,
+    });
+    if (!item) {
+      throw new Error('Could not create a bookmark');
+    }
+    return item;
+  }
+}
diff --git a/src/background/repositories/completions.js b/src/background/repositories/completions.js
new file mode 100644
index 0000000..1318d36
--- /dev/null
+++ b/src/background/repositories/completions.js
@@ -0,0 +1,31 @@
+export default class CompletionsRepository {
+  async queryBookmarks(keywords) {
+    let items = await browser.bookmarks.search({ query: keywords });
+    return items.filter((item) => {
+      let url = undefined;
+      try {
+        url = new URL(item.url);
+      } catch (e) {
+        return false;
+      }
+      return item.type === 'bookmark' && url.protocol !== 'place:';
+    });
+  }
+
+  queryHistories(keywords) {
+    return browser.history.search({
+      text: keywords,
+      startTime: 0,
+    });
+  }
+
+  async queryTabs(keywords, excludePinned) {
+    let tabs = await browser.tabs.query({ currentWindow: true });
+    return tabs.filter((t) => {
+      return t.url.toLowerCase().includes(keywords.toLowerCase()) ||
+        t.title && t.title.toLowerCase().includes(keywords.toLowerCase());
+    }).filter((t) => {
+      return !(excludePinned && t.pinned);
+    });
+  }
+}
diff --git a/src/background/repositories/find.js b/src/background/repositories/find.js
new file mode 100644
index 0000000..9482e78
--- /dev/null
+++ b/src/background/repositories/find.js
@@ -0,0 +1,18 @@
+import MemoryStorage from '../infrastructures/memory-storage';
+
+const FIND_KEYWORD_KEY = 'find-keyword';
+
+export default class FindRepository {
+  constructor() {
+    this.cache = new MemoryStorage();
+  }
+
+  getKeyword() {
+    return Promise.resolve(this.cache.get(FIND_KEYWORD_KEY));
+  }
+
+  setKeyword(keyword) {
+    return this.cache.set(FIND_KEYWORD_KEY, keyword);
+  }
+}
+
diff --git a/src/background/repositories/persistent-setting.js b/src/background/repositories/persistent-setting.js
new file mode 100644
index 0000000..247ea6f
--- /dev/null
+++ b/src/background/repositories/persistent-setting.js
@@ -0,0 +1,16 @@
+import Setting from '../domains/setting';
+
+export default class SettingRepository {
+  save(settings) {
+    return browser.storage.local.set({ settings: settings.serialize() });
+  }
+
+  async load() {
+    let { settings } = await browser.storage.local.get('settings');
+    if (!settings) {
+      return null;
+    }
+    return Setting.deserialize(settings);
+  }
+}
+
diff --git a/src/background/repositories/setting.js b/src/background/repositories/setting.js
new file mode 100644
index 0000000..6d48525
--- /dev/null
+++ b/src/background/repositories/setting.js
@@ -0,0 +1,23 @@
+import MemoryStorage from '../infrastructures/memory-storage';
+
+const CACHED_SETTING_KEY = 'setting';
+
+export default class SettingRepository {
+  constructor() {
+    this.cache = new MemoryStorage();
+  }
+
+  get() {
+    return Promise.resolve(this.cache.get(CACHED_SETTING_KEY));
+  }
+
+  update(value) {
+    return this.cache.set(CACHED_SETTING_KEY, value);
+  }
+
+  async setProperty(name, value) {
+    let current = await this.get();
+    current.properties[name] = value;
+    return this.update(current);
+  }
+}
diff --git a/src/background/repositories/version.js b/src/background/repositories/version.js
new file mode 100644
index 0000000..4c71d05
--- /dev/null
+++ b/src/background/repositories/version.js
@@ -0,0 +1,10 @@
+export default class VersionRepository {
+  async get() {
+    let { version } = await browser.storage.local.get('version');
+    return version;
+  }
+
+  update(version) {
+    return browser.storage.local.set({ version });
+  }
+}
diff --git a/src/background/shared/bookmarks.js b/src/background/shared/bookmarks.js
deleted file mode 100644
index 5e7927b..0000000
--- a/src/background/shared/bookmarks.js
+++ /dev/null
@@ -1,9 +0,0 @@
-const create = (title, url) => {
-  return browser.bookmarks.create({
-    type: 'bookmark',
-    title,
-    url,
-  });
-};
-
-export { create };
diff --git a/src/background/shared/completions/bookmarks.js b/src/background/shared/completions/bookmarks.js
deleted file mode 100644
index bd753af..0000000
--- a/src/background/shared/completions/bookmarks.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const getCompletions = async(keywords) => {
-  let items = await browser.bookmarks.search({ query: keywords });
-  return items.filter((item) => {
-    let url = undefined;
-    try {
-      url = new URL(item.url);
-    } catch (e) {
-      return false;
-    }
-    return item.type === 'bookmark' && url.protocol !== 'place:';
-  }).slice(0, 10);
-};
-
-export { getCompletions };
diff --git a/src/background/shared/completions/histories.js b/src/background/shared/completions/histories.js
deleted file mode 100644
index 2d35401..0000000
--- a/src/background/shared/completions/histories.js
+++ /dev/null
@@ -1,82 +0,0 @@
-const filterHttp = (items) => {
-  const httpsHosts = items
-    .filter(item => item[1].protocol === 'https:')
-    .map(item => item[1].host);
-  const httpsHostSet = new Set(httpsHosts);
-  return items.filter(
-    item => !(item[1].protocol === 'http:' && httpsHostSet.has(item[1].host))
-  );
-};
-
-const filterEmptyTitle = (items) => {
-  return items.filter(item => item[0].title && item[0].title !== '');
-};
-
-const filterClosedPath = (items) => {
-  const allSimplePaths = items
-    .filter(item => item[1].hash === '' && item[1].search === '')
-    .map(item => item[1].origin + item[1].pathname);
-  const allSimplePathSet = new Set(allSimplePaths);
-  return items.filter(
-    item => !(item[1].hash === '' && item[1].search === '' &&
-      (/\/$/).test(item[1].pathname) &&
-      allSimplePathSet.has(
-        (item[1].origin + item[1].pathname).replace(/\/$/, '')
-      )
-    )
-  );
-};
-
-const reduceByPathname = (items, min) => {
-  let hash = {};
-  for (let item of items) {
-    let pathname = item[1].origin + item[1].pathname;
-    if (!hash[pathname]) {
-      hash[pathname] = item;
-    } else if (hash[pathname][1].href.length > item[1].href.length) {
-      hash[pathname] = item;
-    }
-  }
-  let filtered = Object.values(hash);
-  if (filtered.length < min) {
-    return items;
-  }
-  return filtered;
-};
-
-const reduceByOrigin = (items, min) => {
-  let hash = {};
-  for (let item of items) {
-    let origin = item[1].origin;
-    if (!hash[origin]) {
-      hash[origin] = item;
-    } else if (hash[origin][1].href.length > item[1].href.length) {
-      hash[origin] = item;
-    }
-  }
-  let filtered = Object.values(hash);
-  if (filtered.length < min) {
-    return items;
-  }
-  return filtered;
-};
-
-const getCompletions = async(keyword) => {
-  let historyItems = await browser.history.search({
-    text: keyword,
-    startTime: 0,
-  });
-  return [historyItems.map(item => [item, new URL(item.url)])]
-    .map(filterEmptyTitle)
-    .map(filterHttp)
-    .map(filterClosedPath)
-    .map(items => reduceByPathname(items, 10))
-    .map(items => reduceByOrigin(items, 10))
-    .map(items => items
-      .sort((x, y) => x[0].visitCount < y[0].visitCount)
-      .slice(0, 10)
-      .map(item => item[0])
-    )[0];
-};
-
-export { getCompletions };
diff --git a/src/background/shared/completions/index.js b/src/background/shared/completions/index.js
deleted file mode 100644
index 9ca13f7..0000000
--- a/src/background/shared/completions/index.js
+++ /dev/null
@@ -1,173 +0,0 @@
-import commandDocs from 'shared/commands/docs';
-import * as tabs from './tabs';
-import * as histories from './histories';
-import * as bookmarks from './bookmarks';
-import * as properties from 'shared/settings/properties';
-
-const completeCommands = (typing) => {
-  let keys = Object.keys(commandDocs);
-  return keys
-    .filter(name => name.startsWith(typing))
-    .map(name => ({
-      caption: name,
-      content: name,
-      url: commandDocs[name],
-    }));
-};
-
-const getSearchCompletions = (command, keywords, searchConfig) => {
-  let engineNames = Object.keys(searchConfig.engines);
-  let engineItems = engineNames.filter(name => name.startsWith(keywords))
-    .map(name => ({
-      caption: name,
-      content: command + ' ' + name
-    }));
-  return Promise.resolve(engineItems);
-};
-
-const getHistoryCompletions = async(command, keywords) => {
-  let items = await histories.getCompletions(keywords);
-  return items.map((page) => {
-    return {
-      caption: page.title,
-      content: command + ' ' + page.url,
-      url: page.url
-    };
-  });
-};
-
-const getBookmarksCompletions = async(command, keywords) => {
-  let items = await bookmarks.getCompletions(keywords);
-  return items.map(item => ({
-    caption: item.title,
-    content: command + ' ' + item.url,
-    url: item.url,
-  }));
-};
-
-const getOpenCompletions = async(command, keywords, searchConfig) => {
-  let engineItems = await getSearchCompletions(command, keywords, searchConfig);
-  let historyItems = await getHistoryCompletions(command, keywords);
-  let bookmarkItems = await getBookmarksCompletions(command, keywords);
-  let completions = [];
-  if (engineItems.length > 0) {
-    completions.push({
-      name: 'Search Engines',
-      items: engineItems
-    });
-  }
-  if (historyItems.length > 0) {
-    completions.push({
-      name: 'History',
-      items: historyItems
-    });
-  }
-  if (bookmarkItems.length > 0) {
-    completions.push({
-      name: 'Bookmarks',
-      items: bookmarkItems
-    });
-  }
-  return completions;
-};
-
-const getBufferCompletions = async(command, keywords, excludePinned) => {
-  let items = await tabs.getCompletions(keywords, excludePinned);
-  items = items.map(tab => ({
-    caption: tab.title,
-    content: command + ' ' + tab.title,
-    url: tab.url,
-    icon: tab.favIconUrl
-  }));
-  return [
-    {
-      name: 'Buffers',
-      items: items
-    }
-  ];
-};
-
-const getSetCompletions = (command, keywords) => {
-  let keys = Object.keys(properties.docs).filter(
-    name => name.startsWith(keywords)
-  );
-  let items = keys.map((key) => {
-    if (properties.types[key] === 'boolean') {
-      return [
-        {
-          caption: key,
-          content: command + ' ' + key,
-          url: 'Enable ' + properties.docs[key],
-        }, {
-          caption: 'no' + key,
-          content: command + ' no' + key,
-          url: 'Disable ' + properties.docs[key],
-        }
-      ];
-    }
-    return [
-      {
-        caption: key,
-        content: command + ' ' + key,
-        url: 'Set ' + properties.docs[key],
-      }
-    ];
-  });
-  items = items.reduce((acc, val) => acc.concat(val), []);
-  if (items.length === 0) {
-    return Promise.resolve([]);
-  }
-  return Promise.resolve([
-    {
-      name: 'Properties',
-      items,
-    }
-  ]);
-};
-
-const complete = (line, settings) => {
-  let trimmed = line.trimStart();
-  let words = trimmed.split(/ +/);
-  let name = words[0];
-  if (words.length === 1) {
-    let items = completeCommands(name);
-    if (items.length === 0) {
-      return Promise.resolve([]);
-    }
-    return Promise.resolve([
-      {
-        name: 'Console Command',
-        items: completeCommands(name),
-      }
-    ]);
-  }
-  let keywords = trimmed.slice(name.length).trimStart();
-
-  switch (words[0]) {
-  case 'o':
-  case 'open':
-  case 't':
-  case 'tabopen':
-  case 'w':
-  case 'winopen':
-    return getOpenCompletions(name, keywords, settings.search);
-  case 'b':
-  case 'buffer':
-    return getBufferCompletions(name, keywords, false);
-  case 'bd!':
-  case 'bdel!':
-  case 'bdelete!':
-  case 'bdeletes!':
-    return getBufferCompletions(name, keywords, false);
-  case 'bd':
-  case 'bdel':
-  case 'bdelete':
-  case 'bdeletes':
-    return getBufferCompletions(name, keywords, true);
-  case 'set':
-    return getSetCompletions(name, keywords);
-  }
-  return Promise.resolve([]);
-};
-
-export { complete };
diff --git a/src/background/shared/completions/tabs.js b/src/background/shared/completions/tabs.js
deleted file mode 100644
index bdb2741..0000000
--- a/src/background/shared/completions/tabs.js
+++ /dev/null
@@ -1,8 +0,0 @@
-import * as tabs from '../tabs';
-
-const getCompletions = (keyword, excludePinned) => {
-  return tabs.queryByKeyword(keyword, excludePinned);
-};
-
-
-export { getCompletions };
diff --git a/src/background/shared/indicators.js b/src/background/shared/indicators.js
deleted file mode 100644
index 74002c4..0000000
--- a/src/background/shared/indicators.js
+++ /dev/null
@@ -1,13 +0,0 @@
-const enable = () => {
-  return browser.browserAction.setIcon({
-    path: 'resources/enabled_32x32.png',
-  });
-};
-
-const disable = () => {
-  return browser.browserAction.setIcon({
-    path: 'resources/disabled_32x32.png',
-  });
-};
-
-export { enable, disable };
diff --git a/src/background/shared/tabs.js b/src/background/shared/tabs.js
deleted file mode 100644
index 26e2e44..0000000
--- a/src/background/shared/tabs.js
+++ /dev/null
@@ -1,158 +0,0 @@
-import * as tabCompletions from './completions/tabs';
-
-const closeTab = async(id) => {
-  let tab = await browser.tabs.get(id);
-  if (!tab.pinned) {
-    return browser.tabs.remove(id);
-  }
-};
-
-const closeTabForce = (id) => {
-  return browser.tabs.remove(id);
-};
-
-const queryByKeyword = async(keyword, excludePinned = false) => {
-  let tabs = await browser.tabs.query({ currentWindow: true });
-  return tabs.filter((t) => {
-    return t.url.toLowerCase().includes(keyword.toLowerCase()) ||
-      t.title && t.title.toLowerCase().includes(keyword.toLowerCase());
-  }).filter((t) => {
-    return !(excludePinned && t.pinned);
-  });
-};
-
-const closeTabByKeywords = async(keyword) => {
-  let tabs = await queryByKeyword(keyword, true);
-  if (tabs.length === 0) {
-    throw new Error('No matching buffer for ' + keyword);
-  } else if (tabs.length > 1) {
-    throw new Error('More than one match for ' + keyword);
-  }
-  return browser.tabs.remove(tabs[0].id);
-};
-
-const closeTabByKeywordsForce = async(keyword) => {
-  let tabs = await queryByKeyword(keyword, false);
-  if (tabs.length === 0) {
-    throw new Error('No matching buffer for ' + keyword);
-  } else if (tabs.length > 1) {
-    throw new Error('More than one match for ' + keyword);
-  }
-  return browser.tabs.remove(tabs[0].id);
-};
-
-const closeTabsByKeywords = async(keyword) => {
-  let tabs = await tabCompletions.getCompletions(keyword);
-  tabs = tabs.filter(tab => !tab.pinned);
-  return browser.tabs.remove(tabs.map(tab => tab.id));
-};
-
-const closeTabsByKeywordsForce = async(keyword) => {
-  let tabs = await tabCompletions.getCompletions(keyword);
-  return browser.tabs.remove(tabs.map(tab => tab.id));
-};
-
-const reopenTab = async() => {
-  let window = await browser.windows.getCurrent();
-  let sessions = await browser.sessions.getRecentlyClosed();
-  let session = sessions.find((s) => {
-    return s.tab && s.tab.windowId === window.id;
-  });
-  if (!session) {
-    return;
-  }
-  if (session.tab) {
-    return browser.sessions.restore(session.tab.sessionId);
-  }
-  return browser.sessions.restore(session.window.sessionId);
-};
-
-const selectAt = async(index) => {
-  let tabs = await browser.tabs.query({ currentWindow: true });
-  if (tabs.length < 2) {
-    return;
-  }
-  if (index < 0 || tabs.length <= index) {
-    throw new RangeError(`tab ${index + 1} does not exist`);
-  }
-  let id = tabs[index].id;
-  return browser.tabs.update(id, { active: true });
-};
-
-const selectByKeyword = async(current, keyword) => {
-  let tabs = await queryByKeyword(keyword);
-  if (tabs.length === 0) {
-    throw new RangeError('No matching buffer for ' + keyword);
-  }
-  for (let tab of tabs) {
-    if (tab.index > current.index) {
-      return browser.tabs.update(tab.id, { active: true });
-    }
-  }
-  return browser.tabs.update(tabs[0].id, { active: true });
-};
-
-const selectPrevTab = async(current, count) => {
-  let tabs = await browser.tabs.query({ currentWindow: true });
-  if (tabs.length < 2) {
-    return;
-  }
-  let select = (current - count + tabs.length) % tabs.length;
-  let id = tabs[select].id;
-  return browser.tabs.update(id, { active: true });
-};
-
-const selectNextTab = async(current, count) => {
-  let tabs = await browser.tabs.query({ currentWindow: true });
-  if (tabs.length < 2) {
-    return;
-  }
-  let select = (current + count) % tabs.length;
-  let id = tabs[select].id;
-  return browser.tabs.update(id, { active: true });
-};
-
-const selectFirstTab = async() => {
-  let tabs = await browser.tabs.query({ currentWindow: true });
-  let id = tabs[0].id;
-  return browser.tabs.update(id, { active: true });
-};
-
-const selectLastTab = async() => {
-  let tabs = await browser.tabs.query({ currentWindow: true });
-  let id = tabs[tabs.length - 1].id;
-  return browser.tabs.update(id, { active: true });
-};
-
-const selectTab = (id) => {
-  return browser.tabs.update(id, { active: true });
-};
-
-const reload = (current, cache) => {
-  return browser.tabs.reload(
-    current.id,
-    { bypassCache: cache }
-  );
-};
-
-const updateTabPinned = (current, pinned) => {
-  return browser.tabs.update(current.id, { pinned });
-};
-
-const toggleTabPinned = (current) => {
-  return updateTabPinned(current, !current.pinned);
-};
-
-const duplicate = (id) => {
-  return browser.tabs.duplicate(id);
-};
-
-export {
-  closeTab, closeTabForce,
-  queryByKeyword, closeTabByKeywords, closeTabByKeywordsForce,
-  closeTabsByKeywords, closeTabsByKeywordsForce,
-  reopenTab, selectAt, selectByKeyword,
-  selectPrevTab, selectNextTab, selectFirstTab,
-  selectLastTab, selectTab, reload, updateTabPinned,
-  toggleTabPinned, duplicate
-};
diff --git a/src/background/shared/versions/index.js b/src/background/shared/versions/index.js
deleted file mode 100644
index aa09c92..0000000
--- a/src/background/shared/versions/index.js
+++ /dev/null
@@ -1,38 +0,0 @@
-import * as storage from './storage';
-import * as releaseNotes from './release-notes';
-import manifest from '../../../../manifest.json';
-
-const NOTIFICATION_ID = 'vimvixen-update';
-
-const notificationClickListener = (id) => {
-  if (id !== NOTIFICATION_ID) {
-    return;
-  }
-
-  browser.tabs.create({ url: releaseNotes.url(manifest.version) });
-  browser.notifications.onClicked.removeListener(notificationClickListener);
-};
-
-const checkUpdated = async() => {
-  let prev = await storage.load();
-  if (!prev) {
-    return true;
-  }
-  return manifest.version !== prev;
-};
-
-const notify = () => {
-  browser.notifications.onClicked.addListener(notificationClickListener);
-  return browser.notifications.create(NOTIFICATION_ID, {
-    'type': 'basic',
-    'iconUrl': browser.extension.getURL('resources/icon_48x48.png'),
-    'title': 'Vim Vixen ' + manifest.version + ' has been installed',
-    'message': 'Click here to see release notes',
-  });
-};
-
-const commit = () => {
-  storage.save(manifest.version);
-};
-
-export { checkUpdated, notify, commit };
diff --git a/src/background/shared/versions/release-notes.js b/src/background/shared/versions/release-notes.js
deleted file mode 100644
index 6ef2335..0000000
--- a/src/background/shared/versions/release-notes.js
+++ /dev/null
@@ -1,8 +0,0 @@
-const url = (version) => {
-  if (version) {
-    return 'https://github.com/ueokande/vim-vixen/releases/tag/' + version;
-  }
-  return 'https://github.com/ueokande/vim-vixen/releases/';
-};
-
-export { url };
diff --git a/src/background/shared/versions/storage.js b/src/background/shared/versions/storage.js
deleted file mode 100644
index 7883258..0000000
--- a/src/background/shared/versions/storage.js
+++ /dev/null
@@ -1,10 +0,0 @@
-const load = async() => {
-  let { version } = await browser.storage.local.get('version');
-  return version;
-};
-
-const save = (version) => {
-  return browser.storage.local.set({ version });
-};
-
-export { load, save };
diff --git a/src/background/shared/zooms.js b/src/background/shared/zooms.js
deleted file mode 100644
index 17b28fa..0000000
--- a/src/background/shared/zooms.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// For chromium
-// const ZOOM_SETTINGS = [
-//   0.25, 0.33, 0.50, 0.66, 0.75, 0.80, 0.90, 1.00,
-//   1.10, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00, 4.00, 5.00
-// ];
-
-const ZOOM_SETTINGS = [
-  0.33, 0.50, 0.66, 0.75, 0.80, 0.90, 1.00,
-  1.10, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00
-];
-
-const zoomIn = async(tabId = undefined) => {
-  let current = await browser.tabs.getZoom(tabId);
-  let factor = ZOOM_SETTINGS.find(f => f > current);
-  if (factor) {
-    return browser.tabs.setZoom(tabId, factor);
-  }
-};
-
-const zoomOut = async(tabId = undefined) => {
-  let current = await browser.tabs.getZoom(tabId);
-  let factor = [].concat(ZOOM_SETTINGS).reverse().find(f => f < current);
-  if (factor) {
-    return browser.tabs.setZoom(tabId, factor);
-  }
-};
-
-const neutral = (tabId = undefined) => {
-  return browser.tabs.setZoom(tabId, 1);
-};
-
-export { zoomIn, zoomOut, neutral };
diff --git a/src/background/usecases/addon-enabled.js b/src/background/usecases/addon-enabled.js
new file mode 100644
index 0000000..d83192f
--- /dev/null
+++ b/src/background/usecases/addon-enabled.js
@@ -0,0 +1,29 @@
+import IndicatorPresenter from '../presenters/indicator';
+import TabPresenter from '../presenters/tab';
+import ContentMessageClient from '../infrastructures/content-message-client';
+
+export default class AddonEnabledInteractor {
+  constructor() {
+    this.indicatorPresentor = new IndicatorPresenter();
+
+    this.indicatorPresentor.onClick(tab => this.onIndicatorClick(tab.id));
+
+    this.tabPresenter = new TabPresenter();
+    this.tabPresenter.onSelected(info => this.onTabSelected(info.tabId));
+
+    this.contentMessageClient = new ContentMessageClient();
+  }
+
+  indicate(enabled) {
+    return this.indicatorPresentor.indicate(enabled);
+  }
+
+  onIndicatorClick(tabId) {
+    return this.contentMessageClient.toggleAddonEnabled(tabId);
+  }
+
+  async onTabSelected(tabId) {
+    let enabled = await this.contentMessageClient.getAddonEnabled(tabId);
+    return this.indicatorPresentor.indicate(enabled);
+  }
+}
diff --git a/src/background/usecases/command.js b/src/background/usecases/command.js
new file mode 100644
index 0000000..3dbf768
--- /dev/null
+++ b/src/background/usecases/command.js
@@ -0,0 +1,108 @@
+import * as parsers from './parsers';
+import TabPresenter from '../presenters/tab';
+import WindowPresenter from '../presenters/window';
+import SettingRepository from '../repositories/setting';
+import BookmarkRepository from '../repositories/bookmark';
+import ConsolePresenter from '../presenters/console';
+import ContentMessageClient from '../infrastructures/content-message-client';
+import * as properties from 'shared/settings/properties';
+
+export default class CommandIndicator {
+  constructor() {
+    this.tabPresenter = new TabPresenter();
+    this.windowPresenter = new WindowPresenter();
+    this.settingRepository = new SettingRepository();
+    this.bookmarkRepository = new BookmarkRepository();
+    this.consolePresenter = new ConsolePresenter();
+
+    this.contentMessageClient = new ContentMessageClient();
+  }
+
+  async open(keywords) {
+    let url = await this.urlOrSearch(keywords);
+    return this.tabPresenter.open(url);
+  }
+
+  async tabopen(keywords) {
+    let url = await this.urlOrSearch(keywords);
+    return this.tabPresenter.create(url);
+  }
+
+  async winopen(keywords) {
+    let url = await this.urlOrSearch(keywords);
+    return this.windowPresenter.create(url);
+  }
+
+  async buffer(keywords) {
+    if (keywords.length === 0) {
+      return;
+    }
+    if (!isNaN(keywords)) {
+      let index = parseInt(keywords, 10) - 1;
+      return tabs.selectAt(index);
+    }
+
+    let current = await this.tabPresenter.getCurrent();
+    let tabs = await this.tabPresenter.getByKeyword(keywords);
+    if (tabs.length === 0) {
+      throw new RangeError('No matching buffer for ' + keywords);
+    }
+    for (let tab of tabs) {
+      if (tab.index > current.index) {
+        return this.tabPresenter.select(tab.id);
+      }
+    }
+    return this.tabPresenter.select(tabs[0].id);
+  }
+
+  async bdelete(force, keywords) {
+    let excludePinned = !force;
+    let tabs = await this.tabPresenter.getByKeyword(keywords, excludePinned);
+    if (tabs.length === 0) {
+      throw new Error('No matching buffer for ' + keywords);
+    } else if (tabs.length > 1) {
+      throw new Error('More than one match for ' + keywords);
+    }
+    return this.tabPresenter.remove([tabs[0].id]);
+  }
+
+  async bdeletes(force, keywords) {
+    let excludePinned = !force;
+    let tabs = await this.tabPresenter.getByKeyword(keywords, excludePinned);
+    let ids = tabs.map(tab => tab.id);
+    return this.tabPresenter.remove(ids);
+  }
+
+  async quit() {
+    let tab = await this.tabPresenter.getCurrent();
+    return this.tabPresenter.remove([tab.id]);
+  }
+
+  async quitAll() {
+    let tabs = await this.tabPresenter.getAll();
+    let ids = tabs.map(tab => tab.id);
+    this.tabPresenter.remove(ids);
+  }
+
+  async addbookmark(title) {
+    let tab = await this.tabPresenter.getCurrent();
+    let item = await this.bookmarkRepository.create(title, tab.url);
+    let message = 'Saved current page: ' + item.url;
+    return this.consolePresenter.showInfo(tab.id, message);
+  }
+
+  async set(keywords) {
+    if (keywords.length === 0) {
+      return;
+    }
+    let [name, value] = parsers.parseSetOption(keywords, properties.types);
+    await this.settingRepository.setProperty(name, value);
+
+    return this.contentMessageClient.broadcastSettingsChanged();
+  }
+
+  async urlOrSearch(keywords) {
+    let settings = await this.settingRepository.get();
+    return parsers.normalizeUrl(keywords, settings.search);
+  }
+}
diff --git a/src/background/usecases/completions.js b/src/background/usecases/completions.js
new file mode 100644
index 0000000..2bf5b3b
--- /dev/null
+++ b/src/background/usecases/completions.js
@@ -0,0 +1,150 @@
+import CompletionItem from '../domains/completion-item';
+import CompletionGroup from '../domains/completion-group';
+import Completions from '../domains/completions';
+import CommandDocs from '../domains/command-docs';
+import CompletionRepository from '../repositories/completions';
+import * as filters from './filters';
+import SettingRepository from '../repositories/setting';
+import * as properties from '../../shared/settings/properties';
+
+const COMPLETION_ITEM_LIMIT = 10;
+
+export default class CompletionsInteractor {
+  constructor() {
+    this.completionRepository = new CompletionRepository();
+    this.settingRepository = new SettingRepository();
+  }
+
+  queryConsoleCommand(prefix) {
+    let keys = Object.keys(CommandDocs);
+    let items = keys
+      .filter(name => name.startsWith(prefix))
+      .map(name => ({
+        caption: name,
+        content: name,
+        url: CommandDocs[name],
+      }));
+
+    if (items.length === 0) {
+      return Promise.resolve(Completions.empty());
+    }
+    return Promise.resolve(
+      new Completions([new CompletionGroup('Console Command', items)])
+    );
+  }
+
+  async queryOpen(name, keywords) {
+    let groups = [];
+    let engines = await this.querySearchEngineItems(name, keywords);
+    if (engines.length > 0) {
+      groups.push(new CompletionGroup('Search Engines', engines));
+    }
+    let histories = await this.queryHistoryItems(name, keywords);
+    if (histories.length > 0) {
+      groups.push(new CompletionGroup('History', histories));
+    }
+    let bookmarks = await this.queryBookmarkItems(name, keywords);
+    if (bookmarks.length > 0) {
+      groups.push(new CompletionGroup('Bookmarks', bookmarks));
+    }
+    return new Completions(groups);
+  }
+
+  queryBuffer(name, keywords) {
+    return this.queryTabs(name, false, keywords);
+  }
+
+  queryBdelete(name, keywords) {
+    return this.queryTabs(name, true, keywords);
+  }
+
+  queryBdeleteForce(name, keywords) {
+    return this.queryTabs(name, false, keywords);
+  }
+
+  querySet(name, keywords) {
+    let items = Object.keys(properties.docs).map((key) => {
+      if (properties.types[key] === 'boolean') {
+        return [
+          new CompletionItem({
+            caption: key,
+            content: name + ' ' + key,
+            url: 'Enable ' + properties.docs[key],
+          }),
+          new CompletionItem({
+            caption: 'no' + key,
+            content: name + ' no' + key,
+            url: 'Disable ' + properties.docs[key],
+          }),
+        ];
+      }
+      return [
+        new CompletionItem({
+          caption: key,
+          content: name + ' ' + key,
+          url: 'Set ' + properties.docs[key],
+        })
+      ];
+    });
+    items = items.reduce((acc, val) => acc.concat(val), []);
+    items = items.filter((item) => {
+      return item.caption.startsWith(keywords);
+    });
+    if (items.length === 0) {
+      return Promise.resolve(Completions.empty());
+    }
+    return Promise.resolve(
+      new Completions([new CompletionGroup('Properties', items)])
+    );
+  }
+
+  async queryTabs(name, excludePinned, args) {
+    let tabs = await this.completionRepository.queryTabs(args, excludePinned);
+    let items = tabs.map(tab => new CompletionItem({
+      caption: tab.title,
+      content: name + ' ' + tab.title,
+      url: tab.url,
+      icon: tab.favIconUrl
+    }));
+    if (items.length === 0) {
+      return Promise.resolve(Completions.empty());
+    }
+    return new Completions([new CompletionGroup('Buffers', items)]);
+  }
+
+  async querySearchEngineItems(name, keywords) {
+    let settings = await this.settingRepository.get();
+    let engines = Object.keys(settings.search.engines)
+      .filter(key => key.startsWith(keywords));
+    return engines.map(key => new CompletionItem({
+      caption: key,
+      content: name + ' ' + key,
+    }));
+  }
+
+  async queryHistoryItems(name, keywords) {
+    let histories = await this.completionRepository.queryHistories(keywords);
+    histories = [histories]
+      .map(filters.filterBlankTitle)
+      .map(filters.filterHttp)
+      .map(filters.filterByTailingSlash)
+      .map(pages => filters.filterByPathname(pages, COMPLETION_ITEM_LIMIT))
+      .map(pages => filters.filterByOrigin(pages, COMPLETION_ITEM_LIMIT))[0]
+      .sort((x, y) => x.visitCount < y.visitCount)
+      .slice(0, COMPLETION_ITEM_LIMIT);
+    return histories.map(page => new CompletionItem({
+      caption: page.title,
+      content: name + ' ' + page.url,
+      url: page.url
+    }));
+  }
+
+  async queryBookmarkItems(name, keywords) {
+    let bookmarks = await this.completionRepository.queryBookmarks(keywords);
+    return bookmarks.map(page => new CompletionItem({
+      caption: page.title,
+      content: name + ' ' + page.url,
+      url: page.url
+    }));
+  }
+}
diff --git a/src/background/usecases/filters.js b/src/background/usecases/filters.js
new file mode 100644
index 0000000..d057dca
--- /dev/null
+++ b/src/background/usecases/filters.js
@@ -0,0 +1,72 @@
+const filterHttp = (items) => {
+  let httpsHosts = items.map(x => new URL(x.url))
+    .filter(x => x.protocol === 'https:')
+    .map(x => x.host);
+  httpsHosts = new Set(httpsHosts);
+
+  return items.filter((item) => {
+    let url = new URL(item.url);
+    return url.protocol === 'https:' || !httpsHosts.has(url.host);
+  });
+};
+
+const filterBlankTitle = (items) => {
+  return items.filter(item => item.title && item.title !== '');
+};
+
+const filterByTailingSlash = (items) => {
+  let urls = items.map(item => new URL(item.url));
+  let simplePaths = urls
+    .filter(url => url.hash === '' && url.search === '')
+    .map(url => url.origin + url.pathname);
+  simplePaths = new Set(simplePaths);
+
+  return items.filter((item) => {
+    let url = new URL(item.url);
+    if (url.hash !== '' || url.search !== '' ||
+      url.pathname.slice(-1) !== '/') {
+      return true;
+    }
+    return !simplePaths.has(url.origin + url.pathname.slice(0, -1));
+  });
+};
+
+const filterByPathname = (items, min) => {
+  let hash = {};
+  for (let item of items) {
+    let url = new URL(item.url);
+    let pathname = url.origin + url.pathname;
+    if (!hash[pathname]) {
+      hash[pathname] = item;
+    } else if (hash[pathname].url.length > item.url.length) {
+      hash[pathname] = item;
+    }
+  }
+  let filtered = Object.values(hash);
+  if (filtered.length < min) {
+    return items;
+  }
+  return filtered;
+};
+
+const filterByOrigin = (items, min) => {
+  let hash = {};
+  for (let item of items) {
+    let origin = new URL(item.url).origin;
+    if (!hash[origin]) {
+      hash[origin] = item;
+    } else if (hash[origin].url.length > item.url.length) {
+      hash[origin] = item;
+    }
+  }
+  let filtered = Object.values(hash);
+  if (filtered.length < min) {
+    return items;
+  }
+  return filtered;
+};
+
+export {
+  filterHttp, filterBlankTitle, filterByTailingSlash,
+  filterByPathname, filterByOrigin
+};
diff --git a/src/background/usecases/find.js b/src/background/usecases/find.js
new file mode 100644
index 0000000..eae480d
--- /dev/null
+++ b/src/background/usecases/find.js
@@ -0,0 +1,15 @@
+import FindRepository from '../repositories/find';
+
+export default class FindInteractor {
+  constructor() {
+    this.findRepository = new FindRepository();
+  }
+
+  getKeyword() {
+    return this.findRepository.getKeyword();
+  }
+
+  setKeyword(keyword) {
+    return this.findRepository.setKeyword(keyword);
+  }
+}
diff --git a/src/background/usecases/link.js b/src/background/usecases/link.js
new file mode 100644
index 0000000..f9e474a
--- /dev/null
+++ b/src/background/usecases/link.js
@@ -0,0 +1,27 @@
+import SettingRepository from '../repositories/setting';
+import TabPresenter from '../presenters/tab';
+
+export default class LinkInteractor {
+  constructor() {
+    this.settingRepository = new SettingRepository();
+    this.tabPresenter = new TabPresenter();
+  }
+
+  openToTab(url, tabId) {
+    this.tabPresenter.open(url, tabId);
+
+  }
+
+  async openNewTab(url, openerId, background) {
+    let settings = await this.settingRepository.get();
+    let { adjacenttab } = settings.properties;
+    if (adjacenttab) {
+      return this.tabPresenter.create(url, {
+        openerTabId: openerId, active: !background
+      });
+    }
+    return this.tabPresenter.create(url, {
+      openerTabId: openerId, active: !background
+    });
+  }
+}
diff --git a/src/background/usecases/operation.js b/src/background/usecases/operation.js
new file mode 100644
index 0000000..86f39ca
--- /dev/null
+++ b/src/background/usecases/operation.js
@@ -0,0 +1,192 @@
+import MemoryStorage from '../infrastructures/memory-storage';
+import TabPresenter from '../presenters/tab';
+import ConsolePresenter from '../presenters/console';
+
+const CURRENT_SELECTED_KEY = 'tabs.current.selected';
+const LAST_SELECTED_KEY = 'tabs.last.selected';
+
+const ZOOM_SETTINGS = [
+  0.33, 0.50, 0.66, 0.75, 0.80, 0.90, 1.00,
+  1.10, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00
+];
+
+export default class OperationInteractor {
+  constructor() {
+    this.tabPresenter = new TabPresenter();
+    this.tabPresenter.onSelected(info => this.onTabSelected(info.tabId));
+
+    this.consolePresenter = new ConsolePresenter();
+
+    this.cache = new MemoryStorage();
+  }
+
+  async close(force) {
+    let tab = await this.tabPresenter.getCurrent();
+    if (!force && tab.pinned) {
+      return;
+    }
+    return this.tabPresenter.remove([tab.id]);
+  }
+
+  reopen() {
+    return this.tabPresenter.reopen();
+  }
+
+  async selectPrev(count) {
+    let tabs = await this.tabPresenter.getAll();
+    if (tabs.length < 2) {
+      return;
+    }
+    let tab = tabs.find(t => t.active);
+    if (!tab) {
+      return;
+    }
+    let select = (tab.index - count + tabs.length) % tabs.length;
+    return this.tabPresenter.select(tabs[select].id);
+  }
+
+  async selectNext(count) {
+    let tabs = await this.tabPresenter.getAll();
+    if (tabs.length < 2) {
+      return;
+    }
+    let tab = tabs.find(t => t.active);
+    if (!tab) {
+      return;
+    }
+    let select = (tab.index + count) % tabs.length;
+    return this.tabPresenter.select(tabs[select].id);
+  }
+
+  async selectFirst() {
+    let tabs = await this.tabPresenter.getAll();
+    return this.tabPresenter.select(tabs[0].id);
+  }
+
+  async selectLast() {
+    let tabs = await this.tabPresenter.getAll();
+    return this.tabPresenter.select(tabs[tabs.length - 1].id);
+  }
+
+  async selectPrevSelected() {
+    let tabId = await this.cache.get(LAST_SELECTED_KEY);
+    if (tabId === null || typeof tabId === 'undefined') {
+      return;
+    }
+    this.tabPresenter.select(tabId);
+  }
+
+  async reload(cache) {
+    let tab = await this.tabPresenter.getCurrent();
+    return this.tabPresenter.reload(tab.id, cache);
+  }
+
+  async setPinned(pinned) {
+    let tab = await this.tabPresenter.getCurrent();
+    return this.tabPresenter.setPinned(tab.id, pinned);
+  }
+
+  async togglePinned() {
+    let tab = await this.tabPresenter.getCurrent();
+    return this.tabPresenter.setPinned(tab.id, !tab.pinned);
+  }
+
+  async duplicate() {
+    let tab = await this.tabPresenter.getCurrent();
+    return this.tabPresenter.duplicate(tab.id);
+  }
+
+  async openPageSource() {
+    let tab = await this.tabPresenter.getCurrent();
+    let url = 'view-source:' + tab.url;
+    return this.tabPresenter.create(url);
+  }
+
+  async zoomIn(tabId) {
+    let tab = await this.tabPresenter.getCurrent();
+    let current = await this.tabPresenter.getZoom(tab.id);
+    let factor = ZOOM_SETTINGS.find(f => f > current);
+    if (factor) {
+      return this.tabPresenter.setZoom(tabId, factor);
+    }
+  }
+
+  async zoomOut(tabId) {
+    let tab = await this.tabPresenter.getCurrent();
+    let current = await this.tabPresenter.getZoom(tab.id);
+    let factor = [].concat(ZOOM_SETTINGS).reverse().find(f => f < current);
+    if (factor) {
+      return this.tabPresenter.setZoom(tabId, factor);
+    }
+  }
+
+  zoomNutoral(tabId) {
+    return this.tabPresenter.setZoom(tabId, 1);
+  }
+
+  async showCommand() {
+    let tab = await this.tabPresenter.getCurrent();
+    this.consolePresenter.showCommand(tab.id, '');
+  }
+
+  async showOpenCommand(alter) {
+    let tab = await this.tabPresenter.getCurrent();
+    let command = 'open ';
+    if (alter) {
+      command += tab.url;
+    }
+    return this.consolePresenter.showCommand(tab.id, command);
+  }
+
+  async showTabopenCommand(alter) {
+    let tab = await this.tabPresenter.getCurrent();
+    let command = 'tabopen ';
+    if (alter) {
+      command += tab.url;
+    }
+    return this.consolePresenter.showCommand(tab.id, command);
+  }
+
+  async showWinopenCommand(alter) {
+    let tab = await this.tabPresenter.getCurrent();
+    let command = 'winopen ';
+    if (alter) {
+      command += tab.url;
+    }
+    return this.consolePresenter.showCommand(tab.id, command);
+  }
+
+  async showBufferCommand() {
+    let tab = await this.tabPresenter.getCurrent();
+    let command = 'buffer ';
+    return this.consolePresenter.showCommand(tab.id, command);
+  }
+
+  async showAddbookmarkCommand(alter) {
+    let tab = await this.tabPresenter.getCurrent();
+    let command = 'addbookmark ';
+    if (alter) {
+      command += tab.title;
+    }
+    return this.consolePresenter.showCommand(tab.id, command);
+  }
+
+  async findStart() {
+    let tab = await this.tabPresenter.getCurrent();
+    this.consolePresenter.showFind(tab.id);
+  }
+
+  async hideConsole() {
+    let tab = await this.tabPresenter.getCurrent();
+    this.consolePresenter.hide(tab.id);
+  }
+
+  onTabSelected(tabId) {
+    let lastId = this.cache.get(CURRENT_SELECTED_KEY);
+    if (lastId) {
+      this.cache.set(LAST_SELECTED_KEY, lastId);
+    }
+    this.cache.set(CURRENT_SELECTED_KEY, tabId);
+  }
+}
+
diff --git a/src/shared/commands/parsers.js b/src/background/usecases/parsers.js
index fb37d2a..cda26c3 100644
--- a/src/shared/commands/parsers.js
+++ b/src/background/usecases/parsers.js
@@ -1,20 +1,22 @@
-const normalizeUrl = (args, searchConfig) => {
-  let concat = args.join(' ');
+const trimStart = (str) => {
+  // NOTE String.trimStart is available on Firefox 61
+  return str.replace(/^\s+/, '');
+};
+
+const normalizeUrl = (keywords, searchSettings) => {
   try {
-    return new URL(concat).href;
+    return new URL(keywords).href;
   } catch (e) {
-    if (concat.includes('.') && !concat.includes(' ')) {
-      return 'http://' + concat;
+    if (keywords.includes('.') && !keywords.includes(' ')) {
+      return 'http://' + keywords;
     }
-    let query = concat;
-    let template = searchConfig.engines[
-      searchConfig.default
-    ];
-    for (let key in searchConfig.engines) {
-      if (args[0] === key) {
-        query = args.slice(1).join(' ');
-        template = searchConfig.engines[key];
-      }
+    let template = searchSettings.engines[searchSettings.default];
+    let query = keywords;
+
+    let first = trimStart(keywords).split(' ')[0];
+    if (Object.keys(searchSettings.engines).includes(first)) {
+      template = searchSettings.engines[first];
+      query = trimStart(trimStart(keywords).slice(first.length));
     }
     return template.replace('{}', encodeURIComponent(query));
   }
@@ -50,10 +52,4 @@ const parseSetOption = (word, types) => {
   }
 };
 
-const parseCommandLine = (line) => {
-  let words = line.trim().split(/ +/);
-  let name = words.shift();
-  return [name, words];
-};
-
-export { normalizeUrl, parseCommandLine, parseSetOption };
+export { normalizeUrl, parseSetOption };
diff --git a/src/background/usecases/setting.js b/src/background/usecases/setting.js
new file mode 100644
index 0000000..656fc3f
--- /dev/null
+++ b/src/background/usecases/setting.js
@@ -0,0 +1,31 @@
+import Setting from '../domains/setting';
+import PersistentSettingRepository from '../repositories/persistent-setting';
+import SettingRepository from '../repositories/setting';
+
+export default class SettingInteractor {
+  constructor() {
+    this.persistentSettingRepository = new PersistentSettingRepository();
+    this.settingRepository = new SettingRepository();
+  }
+
+  save(settings) {
+    this.persistentSettingRepository.save(settings);
+  }
+
+  get() {
+    return this.settingRepository.get();
+  }
+
+  async reload() {
+    let settings = await this.persistentSettingRepository.load();
+    if (!settings) {
+      settings = Setting.defaultSettings();
+    }
+
+    let value = settings.value();
+
+    this.settingRepository.update(value);
+
+    return value;
+  }
+}
diff --git a/src/background/usecases/version.js b/src/background/usecases/version.js
new file mode 100644
index 0000000..a71f90d
--- /dev/null
+++ b/src/background/usecases/version.js
@@ -0,0 +1,41 @@
+import manifest from '../../../manifest.json';
+import VersionRepository from '../repositories/version';
+import TabPresenter from '../presenters/tab';
+import Notifier from '../infrastructures/notifier';
+
+export default class VersionInteractor {
+  constructor() {
+    this.versionRepository = new VersionRepository();
+    this.tabPresenter = new TabPresenter();
+    this.notifier = new Notifier();
+  }
+
+  async notifyIfUpdated() {
+    if (!await this.checkUpdated()) {
+      return;
+    }
+
+    let title = 'Vim Vixen ' + manifest.version + ' has been installed';
+    let message = 'Click here to see release notes';
+    this.notifier.notify(title, message, () => {
+      let url = this.releaseNoteUrl(manifest.version);
+      this.tabPresenter.create(url);
+    });
+    this.versionRepository.update(manifest.version);
+  }
+
+  async checkUpdated() {
+    let prev = await this.versionRepository.get();
+    if (!prev) {
+      return true;
+    }
+    return manifest.version !== prev;
+  }
+
+  releaseNoteUrl(version) {
+    if (version) {
+      return 'https://github.com/ueokande/vim-vixen/releases/tag/' + version;
+    }
+    return 'https://github.com/ueokande/vim-vixen/releases/';
+  }
+}
diff --git a/test/background/actions/find.test.js b/test/background/actions/find.test.js
deleted file mode 100644
index 6b0b846..0000000
--- a/test/background/actions/find.test.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import actions from 'background/actions';
-import * as findActions from 'background/actions/find';
-
-describe("find actions", () => {
-  describe("setKeyword", () => {
-    it('create FIND_SET_KEYWORD action', () => {
-      let action = findActions.setKeyword('banana');
-      expect(action.type).to.equal(actions.FIND_SET_KEYWORD);
-      expect(action.keyword).to.equal('banana');
-    });
-  });
-});
diff --git a/test/background/actions/tab.test.js b/test/background/actions/tab.test.js
deleted file mode 100644
index ab57374..0000000
--- a/test/background/actions/tab.test.js
+++ /dev/null
@@ -1,13 +0,0 @@
-import actions from 'background/actions';
-import * as tabActions from 'background/actions/tab';
-
-describe("tab actions", () => {
-  describe("selected", () => {
-    it('create TAB_SELECTED action', () => {
-      let action = tabActions.selected(123);
-      expect(action.type).to.equal(actions.TAB_SELECTED);
-      expect(action.tabId).to.equal(123);
-    });
-  });
-});
-
diff --git a/test/background/infrastructures/memory-storage.test.js b/test/background/infrastructures/memory-storage.test.js
new file mode 100644
index 0000000..0fea895
--- /dev/null
+++ b/test/background/infrastructures/memory-storage.test.js
@@ -0,0 +1,46 @@
+import MemoryStorage from 'background/infrastructures/memory-storage';
+
+describe("background/infrastructures/memory-storage", () => {
+  let versionRepository;
+
+  it('stores values', () => {
+    let cache = new MemoryStorage();
+    cache.set('number', 123);
+    expect(cache.get('number')).to.equal(123);
+
+    cache.set('string', '123');
+    expect(cache.get('string')).to.equal('123');
+
+    cache.set('object', { hello: '123' });
+    expect(cache.get('object')).to.deep.equal({ hello: '123' });
+  });
+
+  it('returns undefined if no keys', () => {
+    let cache = new MemoryStorage();
+    expect(cache.get('no-keys')).to.be.undefined;
+  })
+
+  it('stored on shared memory', () => {
+    let cache = new MemoryStorage();
+    cache.set('red', 'apple');
+
+    cache = new MemoryStorage();
+    let got = cache.get('red');
+    expect(got).to.equal('apple');
+  });
+
+  it('stored cloned objects', () => {
+    let cache = new MemoryStorage();
+    let recipe = { sugar: '300g' };
+    cache.set('recipe', recipe);
+
+    recipe.salt = '20g'
+    let got = cache.get('recipe', recipe);
+    expect(got).to.deep.equal({ sugar: '300g' });
+  });
+
+  it('throws an error with unserializable objects', () => {
+    let cache = new MemoryStorage();
+    expect(() => cache.set('fn', setTimeout)).to.throw();
+  })
+});
diff --git a/test/background/reducers/find.test.js b/test/background/reducers/find.test.js
deleted file mode 100644
index c366223..0000000
--- a/test/background/reducers/find.test.js
+++ /dev/null
@@ -1,18 +0,0 @@
-import actions from 'background/actions';
-import findReducer from 'background/reducers/find';
-
-describe("find reducer", () => {
-  it('return the initial state', () => {
-    let state = findReducer(undefined, {});
-    expect(state).to.have.deep.property('keyword', null);
-  });
-
-  it('return next state for FIND_SET_KEYWORD', () => {
-    let action = {
-      type: actions.FIND_SET_KEYWORD,
-      keyword: 'cherry',
-    };
-    let state = findReducer(undefined, action);
-    expect(state).to.have.deep.property('keyword', 'cherry')
-  });
-});
diff --git a/test/background/reducers/setting.test.js b/test/background/reducers/setting.test.js
deleted file mode 100644
index 24d02ea..0000000
--- a/test/background/reducers/setting.test.js
+++ /dev/null
@@ -1,35 +0,0 @@
-import actions from 'background/actions';
-import settingReducer from 'background/reducers/setting';
-
-describe("setting reducer", () => {
-  it('return the initial state', () => {
-    let state = settingReducer(undefined, {});
-    expect(state).to.have.deep.property('value', {});
-  });
-
-  it('return next state for SETTING_SET_SETTINGS', () => {
-    let action = {
-      type: actions.SETTING_SET_SETTINGS,
-      value: { key: 123 },
-    };
-    let state = settingReducer(undefined, action);
-    expect(state).to.have.deep.property('value', { key: 123 });
-  });
-
-  it('return next state for SETTING_SET_PROPERTY', () => {
-    let state = {
-      value: {
-        properties: { smoothscroll: true }
-      }
-    }
-    let action = {
-      type: actions.SETTING_SET_PROPERTY,
-      name: 'encoding',
-      value: 'utf-8',
-    };
-    state = settingReducer(state, action);
-
-    expect(state.value.properties).to.have.property('smoothscroll', true);
-    expect(state.value.properties).to.have.property('encoding', 'utf-8');
-  });
-});
diff --git a/test/background/reducers/tab.test.js b/test/background/reducers/tab.test.js
deleted file mode 100644
index 09fa8a7..0000000
--- a/test/background/reducers/tab.test.js
+++ /dev/null
@@ -1,22 +0,0 @@
-import actions from 'background/actions';
-import tabReducer from 'background/reducers/tab';
-
-describe("tab reducer", () => {
-  it('return the initial state', () => {
-    let state = tabReducer(undefined, {});
-    expect(state.previousSelected).to.equal(-1);
-    expect(state.currentSelected).to.equal(-1);
-  });
-
-  it('return next state for TAB_SELECTED', () => {
-    let state = undefined;
-
-    state = tabReducer(state, { type: actions.TAB_SELECTED, tabId: 123 });
-    expect(state.previousSelected).to.equal(-1);
-    expect(state.currentSelected).to.equal(123);
-
-    state = tabReducer(state, { type: actions.TAB_SELECTED, tabId: 456 });
-    expect(state.previousSelected).to.equal(123);
-    expect(state.currentSelected).to.equal(456);
-  });
-});
diff --git a/test/background/shared/versions/storage.test.js b/test/background/repositories/version.js
index f452516..8510ae6 100644
--- a/test/background/shared/versions/storage.test.js
+++ b/test/background/repositories/version.js
@@ -1,14 +1,20 @@
-import * as storage from 'background/shared/versions/storage';
+import VersionRepository from 'background/repositories/version';
 
-describe("shared/versions/storage", () => {
-  describe('#load', () => {
+describe("background/repositories/version", () => {
+  let versionRepository;
+
+  beforeEach(() => {
+    versionRepository = new VersionRepository;
+  });
+
+  describe('#get', () => {
     beforeEach(() => {
       return browser.storage.local.remove('version');
     });
 
     it('loads saved version', async() => {
       await browser.storage.local.set({ version: '1.2.3' });
-      let version = await storage.load();
+      let version = await this.versionRepository.get();
       expect(version).to.equal('1.2.3');
     });
 
@@ -18,9 +24,9 @@ describe("shared/versions/storage", () => {
     });
   });
 
-  describe('#save', () => {
+  describe('#update', () => {
     it('saves version string', async() => {
-      await storage.save('2.3.4');
+      await versionRepository.update('2.3.4');
       let { version } = await browser.storage.local.get('version');
       expect(version).to.equal('2.3.4');
     });
diff --git a/test/background/shared/versions/index.test.js b/test/background/shared/versions/index.test.js
deleted file mode 100644
index d65dd9a..0000000
--- a/test/background/shared/versions/index.test.js
+++ /dev/null
@@ -1,40 +0,0 @@
-import * as versions from 'background/shared/versions';
-import manifest from '../../../../manifest.json';
-
-describe("shared/versions/storage", () => {
-  describe('#checkUpdated', () => {
-    beforeEach(() => {
-      return browser.storage.local.remove('version');
-    });
-
-    it('return true if no previous versions', async() => {
-      let updated = await versions.checkUpdated();
-      expect(updated).to.be.true;
-    });
-
-    it('return true if updated', async() => {
-      await browser.storage.local.set({ version: '0.001' });
-      let updated = await versions.checkUpdated();
-      expect(updated).to.be.true;
-    });
-
-    it('return false if not updated', async() => {
-      await browser.storage.local.set({ version: manifest.version });
-      let updated = await versions.checkUpdated();
-      expect(updated).to.be.false;
-    });
-  });
-
-  describe('#commit', () => {
-    beforeEach(() => {
-      return browser.storage.local.remove('version');
-    });
-
-    it('saves current version from manifest.json', async() => {
-      await versions.commit();
-      let { version } = await browser.storage.local.get('version');
-      expect(version).to.be.a('string');
-      expect(version).to.equal(manifest.version);
-    });
-  });
-});
diff --git a/test/background/usecases/filters.test.js b/test/background/usecases/filters.test.js
new file mode 100644
index 0000000..bdfb0be
--- /dev/null
+++ b/test/background/usecases/filters.test.js
@@ -0,0 +1,113 @@
+import * as filters from 'background/usecases/filters';
+
+describe("background/usecases/filters", () => {
+  describe('filterHttp', () => {
+    it('filters http URLs duplicates to https hosts', () => {
+      let pages = [
+        { url: 'http://i-beam.org/foo' },
+        { url: 'https://i-beam.org/bar' },
+        { url: 'http://i-beam.net/hoge' },
+        { url: 'http://i-beam.net/fuga' },
+      ];
+      let filtered = filters.filterHttp(pages);
+
+      let urls = filtered.map(x => x.url);
+      expect(urls).to.deep.equal([
+        'https://i-beam.org/bar', 'http://i-beam.net/hoge', 'http://i-beam.net/fuga'
+      ]);
+    })
+  });
+
+  describe('filterBlankTitle', () => {
+    it('filters blank titles', () => {
+      let pages = [
+        { title: 'hello' },
+        { title: '' },
+        {},
+      ];
+      let filtered = filters.filterBlankTitle(pages);
+
+      expect(filtered).to.deep.equal([{ title: 'hello' }]);
+    });
+  })
+
+  describe('filterByTailingSlash', () => {
+    it('filters duplicated pathname on tailing slash', () => {
+      let pages = [
+        { url: 'http://i-beam.org/content' },
+        { url: 'http://i-beam.org/content/' },
+        { url: 'http://i-beam.org/search' },
+        { url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+      ];
+      let filtered = filters.filterByTailingSlash(pages);
+
+      let urls = filtered.map(x => x.url);
+      expect(urls).to.deep.equal([
+        'http://i-beam.org/content',
+        'http://i-beam.org/search',
+        'http://i-beam.org/search?q=apple_banana_cherry',
+      ]);
+    });
+  })
+
+  describe('filterByPathname', () => {
+    it('remains items less than minimam length', () => {
+      let pages = [
+        { url: 'http://i-beam.org/search?q=apple' },
+        { url: 'http://i-beam.org/search?q=apple_banana' },
+        { url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { url: 'http://i-beam.org/request?q=apple' },
+        { url: 'http://i-beam.org/request?q=apple_banana' },
+        { url: 'http://i-beam.org/request?q=apple_banana_cherry' },
+      ];
+      let filtered = filters.filterByPathname(pages, 10);
+      expect(filtered).to.have.lengthOf(6);
+    });
+
+    it('filters by length of pathname', () => {
+      let pages = [
+        { url: 'http://i-beam.org/search?q=apple' },
+        { url: 'http://i-beam.org/search?q=apple_banana' },
+        { url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { url: 'http://i-beam.net/search?q=apple' },
+        { url: 'http://i-beam.net/search?q=apple_banana' },
+        { url: 'http://i-beam.net/search?q=apple_banana_cherry' },
+      ];
+      let filtered = filters.filterByPathname(pages, 0);
+      expect(filtered).to.deep.equal([
+        { url: 'http://i-beam.org/search?q=apple' },
+        { url: 'http://i-beam.net/search?q=apple' },
+      ]);
+    });
+  })
+
+  describe('filterByOrigin', () => {
+    it('remains items less than minimam length', () => {
+      let pages = [
+        { url: 'http://i-beam.org/search?q=apple' },
+        { url: 'http://i-beam.org/search?q=apple_banana' },
+        { url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { url: 'http://i-beam.org/request?q=apple' },
+        { url: 'http://i-beam.org/request?q=apple_banana' },
+        { url: 'http://i-beam.org/request?q=apple_banana_cherry' },
+      ];
+      let filtered = filters.filterByOrigin(pages, 10);
+      expect(filtered).to.have.lengthOf(6);
+    });
+
+    it('filters by length of pathname', () => {
+      let pages = [
+        { url: 'http://i-beam.org/search?q=apple' },
+        { url: 'http://i-beam.org/search?q=apple_banana' },
+        { url: 'http://i-beam.org/search?q=apple_banana_cherry' },
+        { url: 'http://i-beam.org/request?q=apple' },
+        { url: 'http://i-beam.org/request?q=apple_banana' },
+        { url: 'http://i-beam.org/request?q=apple_banana_cherry' },
+      ];
+      let filtered = filters.filterByOrigin(pages, 0);
+      expect(filtered).to.deep.equal([
+        { url: 'http://i-beam.org/search?q=apple' },
+      ]);
+    });
+  })
+});
diff --git a/test/shared/commands/parsers.test.js b/test/background/usecases/parsers.test.js
index 1910f07..a58c4a3 100644
--- a/test/shared/commands/parsers.test.js
+++ b/test/background/usecases/parsers.test.js
@@ -1,4 +1,4 @@
-import * as parsers from 'shared/commands/parsers';
+import * as parsers from 'background/usecases/parsers';
 
 describe("shared/commands/parsers", () => {
   describe("#parsers.parseSetOption", () => {
@@ -55,30 +55,19 @@ describe("shared/commands/parsers", () => {
     };
 
     it('convertes search url', () => {
-      expect(parsers.normalizeUrl(['google', 'apple'], config))
+      expect(parsers.normalizeUrl('google apple', config))
         .to.equal('https://google.com/search?q=apple');
-      expect(parsers.normalizeUrl(['yahoo', 'apple'], config))
+      expect(parsers.normalizeUrl('yahoo apple', config))
         .to.equal('https://yahoo.com/search?q=apple');
-      expect(parsers.normalizeUrl(['google', 'apple', 'banana'], config))
+      expect(parsers.normalizeUrl('google apple banana', config))
         .to.equal('https://google.com/search?q=apple%20banana');
-      expect(parsers.normalizeUrl(['yahoo', 'C++CLI'], config))
+      expect(parsers.normalizeUrl('yahoo C++CLI', config))
         .to.equal('https://yahoo.com/search?q=C%2B%2BCLI');
     });
 
     it('user default  search engine', () => {
-      expect(parsers.normalizeUrl(['apple', 'banana'], config))
+      expect(parsers.normalizeUrl('apple banana', config))
         .to.equal('https://google.com/search?q=apple%20banana');
     });
   });
-
-  describe('#parseCommandLine', () => {
-    it('parse command line as name and args', () => {
-      expect(parsers.parseCommandLine('open google apple')).to.deep.equal(['open', ['google', 'apple']]);
-      expect(parsers.parseCommandLine('  open  google  apple  ')).to.deep.equal(['open', ['google', 'apple']]);
-      expect(parsers.parseCommandLine('')).to.deep.equal(['', []]);
-      expect(parsers.parseCommandLine('  ')).to.deep.equal(['', []]);
-      expect(parsers.parseCommandLine('exit')).to.deep.equal(['exit', []]);
-      expect(parsers.parseCommandLine('  exit  ')).to.deep.equal(['exit', []]);
-    });
-  });
 });