8 files changed, 100 insertions, 15 deletions
diff --git a/src/background/actions/command.js b/src/background/actions/command.js
index 4c52bca..2f7305a 100644
--- a/src/background/actions/command.js
+++ b/src/background/actions/command.js
@@ -1,5 +1,5 @@
 import actions from '../actions';
-import * as tabs from 'background/tabs';
+import * as tabs from '../shared/tabs';
 import * as parsers from 'shared/commands/parsers';
 import * as properties from 'shared/settings/properties';
 
diff --git a/src/background/components/background.js b/src/background/components/background.js
index 81d815b..e13424b 100644
--- a/src/background/components/background.js
+++ b/src/background/components/background.js
@@ -3,7 +3,7 @@ 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 commands from 'shared/commands';
+import * as completions from '../shared/completions';
 
 export default class BackgroundComponent {
   constructor(store) {
@@ -44,7 +44,7 @@ export default class BackgroundComponent {
     case messages.SETTINGS_QUERY:
       return Promise.resolve(this.store.getState().setting.value);
     case messages.CONSOLE_QUERY_COMPLETIONS:
-      return commands.complete(message.text, settings.value);
+      return completions.complete(message.text, settings.value);
     case messages.SETTINGS_RELOAD:
       this.store.dispatch(settingActions.load());
       return this.broadcastSettingsChanged();
diff --git a/src/background/components/operation.js b/src/background/components/operation.js
index e1094c5..b9581c9 100644
--- a/src/background/components/operation.js
+++ b/src/background/components/operation.js
@@ -1,7 +1,7 @@
 import messages from 'shared/messages';
 import operations from 'shared/operations';
-import * as tabs from 'background/tabs';
-import * as zooms from 'background/zooms';
+import * as tabs from '../shared//tabs';
+import * as zooms from '../shared/zooms';
 
 export default class BackgroundComponent {
   constructor(store) {
diff --git a/src/background/histories.js b/src/background/shared/completions/histories.js
index a7d3d47..a7d3d47 100644
--- a/src/background/histories.js
+++ b/src/background/shared/completions/histories.js
diff --git a/src/background/shared/completions/index.js b/src/background/shared/completions/index.js
new file mode 100644
index 0000000..73b7b27
--- /dev/null
+++ b/src/background/shared/completions/index.js
@@ -0,0 +1,84 @@
+import * as tabs from './tabs';
+import * as histories from './histories';
+
+const getOpenCompletions = (command, keywords, searchConfig) => {
+  return histories.getCompletions(keywords).then((pages) => {
+    let historyItems = pages.map((page) => {
+      return {
+        caption: page.title,
+        content: command + ' ' + page.url,
+        url: page.url
+      };
+    });
+    let engineNames = Object.keys(searchConfig.engines);
+    let engineItems = engineNames.filter(name => name.startsWith(keywords))
+      .map(name => ({
+        caption: name,
+        content: command + ' ' + name
+      }));
+
+    let completions = [];
+    if (engineItems.length > 0) {
+      completions.push({
+        name: 'Search Engines',
+        items: engineItems
+      });
+    }
+    if (historyItems.length > 0) {
+      completions.push({
+        name: 'History',
+        items: historyItems
+      });
+    }
+    return completions;
+  });
+};
+
+const getCompletions = (line, settings) => {
+  let typedWords = line.trim().split(/ +/);
+  let typing = '';
+  if (!line.endsWith(' ')) {
+    typing = typedWords.pop();
+  }
+
+  if (typedWords.length === 0) {
+    return Promise.resolve([]);
+  }
+  let name = typedWords.shift();
+  let keywords = typedWords.concat(typing).join(' ');
+
+  switch (name) {
+  case 'o':
+  case 'open':
+  case 't':
+  case 'tabopen':
+  case 'w':
+  case 'winopen':
+    return getOpenCompletions(name, keywords, settings.search);
+  case 'b':
+  case 'buffer':
+    return tabs.getCompletions(keywords).then((gotTabs) => {
+      let items = gotTabs.map((tab) => {
+        return {
+          caption: tab.title,
+          content: name + ' ' + tab.title,
+          url: tab.url,
+          icon: tab.favIconUrl
+        };
+      });
+      return [
+        {
+          name: 'Buffers',
+          items: items
+        }
+      ];
+    });
+  }
+  return Promise.resolve([]);
+};
+
+const complete = (line, settings) => {
+  return getCompletions(line, settings);
+};
+
+export { complete };
diff --git a/src/background/shared/completions/tabs.js b/src/background/shared/completions/tabs.js
new file mode 100644
index 0000000..5edddca
--- /dev/null
+++ b/src/background/shared/completions/tabs.js
@@ -0,0 +1,10 @@
+const getCompletions = (keyword) => {
+  return browser.tabs.query({ currentWindow: true }).then((tabs) => {
+    let matched = tabs.filter((t) => {
+      return t.url.includes(keyword) || t.title && t.title.includes(keyword);
+    });
+    return matched;
+  });
+};
+
+export { getCompletions };
diff --git a/src/background/tabs.js b/src/background/shared/tabs.js
index e939870..277afb2 100644
--- a/src/background/tabs.js
+++ b/src/background/shared/tabs.js
@@ -66,15 +66,6 @@ const selectByKeyword = (current, keyword) => {
   });
 };
 
-const getCompletions = (keyword) => {
-  return browser.tabs.query({ currentWindow: true }).then((tabs) => {
-    let matched = tabs.filter((t) => {
-      return t.url.includes(keyword) || t.title && t.title.includes(keyword);
-    });
-    return matched;
-  });
-};
-
 const selectPrevTab = (current, count) => {
   return browser.tabs.query({ currentWindow: true }).then((tabs) => {
     if (tabs.length < 2) {
@@ -139,7 +130,7 @@ const duplicate = (id) => {
 
 export {
   closeTab, closeTabForce, reopenTab, selectAt, selectByKeyword,
-  getCompletions, selectPrevTab, selectNextTab, selectFirstTab,
+  selectPrevTab, selectNextTab, selectFirstTab,
   selectLastTab, selectPrevSelTab, reload, updateTabPinned,
   toggleTabPinned, duplicate
 };
diff --git a/src/background/zooms.js b/src/background/shared/zooms.js
index e3e2aa6..e3e2aa6 100644
--- a/src/background/zooms.js
+++ b/src/background/shared/zooms.js