9 files changed, 242 insertions, 21 deletions
diff --git a/src/background/index.js b/src/background/index.js
new file mode 100644
index 0000000..604ea92
--- /dev/null
+++ b/src/background/index.js
@@ -0,0 +1,46 @@
+import * as actions from '../shared/actions';
+import * as tabs from './tabs';
+import KeyQueue from './key-queue';
+
+const queue = new KeyQueue();
+
+const keyDownHandle = (request) => {
+  return queue.push({
+    code: request.code,
+    shift: request.shift,
+    ctrl: request.ctrl,
+    alt: request.alt,
+    meta: request.meta
+  })
+}
+
+const doBackgroundAction = (sender, action) => {
+  switch(action[0]) {
+  case actions.TABS_PREV:
+    tabs.selectPrevTab(sender.tab.index, actions[1] || 1);
+    break;
+  case actions.TABS_NEXT:
+    tabs.selectNextTab(sender.tab.index, actions[1] || 1);
+    break;
+  }
+}
+
+browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
+  let action = null;
+
+  switch (request.type) {
+  case 'event.keydown':
+    action = keyDownHandle(request);
+    break;
+  }
+
+  if (action == null) {
+    return;
+  }
+
+  if (actions.isBackgroundAction(action[0])) {
+    doBackgroundAction(sender, action);
+  } else if (actions.isContentAction(action[0])) {
+    sendResponse(action);
+  }
+});
diff --git a/src/background/key-queue.js b/src/background/key-queue.js
new file mode 100644
index 0000000..e21399e
--- /dev/null
+++ b/src/background/key-queue.js
@@ -0,0 +1,38 @@
+import * as keys from './keys';
+import * as actions from '../shared/actions';
+
+const DEFAULT_KEYMAP = [
+  { keys: [{ code: KeyboardEvent.DOM_VK_K }], action: [ actions.SCROLL_UP, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_J }], action: [ actions.SCROLL_DOWN, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_G }, { code: KeyboardEvent.DOM_VK_G }], action: [ actions.SCROLL_TOP ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_G, shift: true }], action: [ actions.SCROLL_BOTTOM ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_H }], action: [ actions.TABS_PREV, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_L }], action: [ actions.TABS_NEXT, 1 ]},
+]
+
+export default class KeyQueue {
+
+  constructor(keymap) {
+    this.data = [];
+    this.keymap = keymap;
+  }
+
+  push(key) {
+    this.data.push(key);
+    let filtered = DEFAULT_KEYMAP.filter((map) => {
+      return keys.hasPrefix(map.keys, this.data)
+    });
+
+    if (filtered.length == 0) {
+      this.data = [];
+      return;
+    } else if (filtered.length == 1) {
+      let map = filtered[0];
+      if (map.keys.length == this.data.length) {
+        this.data = [];
+        return map.action;
+      }
+    }
+    return null;
+  }
+}
diff --git a/src/background/keys.js b/src/background/keys.js
new file mode 100644
index 0000000..2fd00a2
--- /dev/null
+++ b/src/background/keys.js
@@ -0,0 +1,28 @@
+const identifyKey = (key1, key2) => {
+  return (key1.code === key2.code) &&
+    ((key1.shift || false) === (key2.shift || false)) &&
+    ((key1.ctrl || false) === (key2.ctrl || false)) &&
+    ((key1.alt || false) === (key2.alt || false)) &&
+    ((key1.meta || false) === (key2.meta || false));
+};
+
+const hasPrefix = (keys, prefix) => {
+  if (keys.length < prefix.length) {
+    return false;
+  }
+  for (let i = 0; i < prefix.length; ++i) {
+    if (!identifyKey(keys[i], prefix[i])) {
+      return false;
+    }
+  }
+  return true;
+}
+
+const identifyKeys = (keys1, keys2) => {
+  if (keys1.length !== keys2.length) {
+    return false;
+  }
+  return hasPrefix(keys1, keys2);
+}
+
+export { identifyKey, identifyKeys, hasPrefix };
diff --git a/src/background/tabs.js b/src/background/tabs.js
new file mode 100644
index 0000000..000bd7d
--- /dev/null
+++ b/src/background/tabs.js
@@ -0,0 +1,23 @@
+const selectPrevTab = (current, count) => {
+  chrome.tabs.query({ currentWindow: true }, (tabs) => {
+    if (tabs.length < 2) {
+      return;
+    }
+    let select = (current - count) % tabs.length
+    let id = tabs[select].id;
+    chrome.tabs.update(id, { active: true })
+  });
+};
+
+const selectNextTab = (current, count) => {
+  chrome.tabs.query({ currentWindow: true }, (tabs) => {
+    if (tabs.length < 2) {
+      return;
+    }
+    let select = (current + count + tabs.length) % tabs.length
+    let id = tabs[select].id;
+    chrome.tabs.update(id, { active: true })
+  });
+};
+
+export { selectNextTab, selectPrevTab };
diff --git a/src/content/index.js b/src/content/index.js
new file mode 100644
index 0000000..03efc5e
--- /dev/null
+++ b/src/content/index.js
@@ -0,0 +1,54 @@
+import * as scrolls from './scrolls';
+import * as actions from '../shared/actions';
+
+const invokeEvent = (action) => {
+  if (typeof action === 'undefined' || action === null) {
+    return;
+  }
+
+  switch (action[0]) {
+  case actions.SCROLL_UP:
+    scrolls.scrollUp(window, action[1] || 1);
+    break;
+  case actions.SCROLL_DOWN:
+    scrolls.scrollDown(window, action[1] || 1);
+    break;
+  case actions.SCROLL_TOP:
+    scrolls.scrollTop(window, action[1]);
+    break;
+  case actions.SCROLL_BOTTOM:
+    scrolls.scrollBottom(window, action[1]);
+    break;
+  }
+}
+
+const isModifier = (code) => {
+  return code === KeyboardEvent.DOM_VK_SHIFT ||
+    code === KeyboardEvent.DOM_VK_ALT ||
+    code === KeyboardEvent.DOM_VK_CONTROL ||
+    code === KeyboardEvent.DOM_VK_META;
+}
+
+window.addEventListener("keydown", (e) => {
+  if (e.target instanceof HTMLInputElement) {
+    return;
+  }
+  if (isModifier(e.keyCode)) {
+    return;
+  }
+
+  let request = {
+    type: 'event.keydown',
+    code: e.keyCode,
+    shift: e.shiftKey,
+    alt: e.altKey,
+    meta: e.metaKey,
+    ctrl: e.ctrlKey,
+  }
+
+  browser.runtime.sendMessage(request)
+    .then(invokeEvent,
+      (err) => {
+        console.log(`Vim Vixen: ${err}`);
+      });
+});
diff --git a/src/content/scrolls.js b/src/content/scrolls.js
new file mode 100644
index 0000000..2a233c2
--- /dev/null
+++ b/src/content/scrolls.js
@@ -0,0 +1,27 @@
+const SCROLL_DELTA = 48;
+
+const scrollUp = (page, count) => {
+  let x = page.scrollX;
+  let y = page.scrollY - SCROLL_DELTA * count;
+  page.scrollTo(x, y);
+};
+
+const scrollDown = (page, count) => {
+  let x = page.scrollX;
+  let y = page.scrollY + SCROLL_DELTA * count;
+  page.scrollTo(x, y);
+};
+
+const scrollTop = (page) => {
+  let x = page.scrollX;
+  let y = 0;
+  page.scrollTo(x, y);
+};
+
+const scrollBottom = (page) => {
+  let x = page.scrollX;
+  let y = page.scrollMaxY;
+  page.scrollTo(x, y);
+};
+
+export { scrollUp, scrollDown, scrollTop, scrollBottom }
diff --git a/src/index.js b/src/index.js
deleted file mode 100644
index 8c9b627..0000000
--- a/src/index.js
+++ /dev/null
@@ -1,3 +0,0 @@
-import * as Module from './module';
-
-Module.initialize()
diff --git a/src/module.js b/src/module.js
deleted file mode 100644
index e967a62..0000000
--- a/src/module.js
+++ /dev/null
@@ -1,18 +0,0 @@
-const initialize = () => {
-  let p = document.createElement("p");
-  p.textContent = "Hello Vim Vixen";
-  p.style.position = 'fixed';
-  p.style.right = '0';
-  p.style.bottom = '0';
-  p.style.padding = '0rem .5rem';
-  p.style.margin = '0';
-  p.style.backgroundColor = 'lightgray';
-  p.style.border = 'gray';
-  p.style.boxShadow = '0 0 2px gray inset';
-  p.style.borderRadius = '3px';
-  p.style.fontFamily = 'monospace';
-
-  document.body.append(p)
-}
-
-export { initialize };
diff --git a/src/shared/actions.js b/src/shared/actions.js
new file mode 100644
index 0000000..3e3cbd0
--- /dev/null
+++ b/src/shared/actions.js
@@ -0,0 +1,26 @@
+export const TABS_PREV = 'tabs.prev';
+export const TABS_NEXT = 'tabs.next';
+export const SCROLL_UP = 'scroll.up';
+export const SCROLL_DOWN = 'scroll.down';
+export const SCROLL_TOP = 'scroll.top';
+export const SCROLL_BOTTOM = 'scroll.bottom';
+
+const BACKGROUND_ACTION_SET = new Set([
+  TABS_PREV,
+  TABS_NEXT
+]);
+
+const CONTENT_ACTION_SET = new Set([
+  SCROLL_UP,
+  SCROLL_DOWN,
+  SCROLL_TOP,
+  SCROLL_BOTTOM
+]);
+
+export const isBackgroundAction = (action) => {
+  return BACKGROUND_ACTION_SET.has(action);
+};
+
+export const isContentAction = (action) => {
+  return CONTENT_ACTION_SET.has(action);
+};