From 21404ad534278eff643be089da9c07882b29da82 Mon Sep 17 00:00:00 2001
From: Shin'ya Ueoka <ueokande@i-beam.org>
Date: Sun, 27 Aug 2017 17:59:25 +0900
Subject: [PATCH] support 0/$ commands

---
 src/background/key-queue.js |  2 ++
 src/content/index.js        | 10 ++++++++--
 src/content/scrolls.js      | 14 +++++++++++++-
 src/shared/actions.js       |  4 ++++
 4 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/background/key-queue.js b/src/background/key-queue.js
index d936233..3805305 100644
--- a/src/background/key-queue.js
+++ b/src/background/key-queue.js
@@ -14,6 +14,8 @@ const DEFAULT_KEYMAP = {
   '<C-F>': [ actions.SCROLL_PAGES, 1 ],
   'gg': [ actions.SCROLL_TOP ],
   'G': [ actions.SCROLL_BOTTOM ],
+  '0': [ actions.SCROLL_LEFT ],
+  '$': [ actions.SCROLL_RIGHT ],
   'd': [ actions.TABS_CLOSE ],
   'u': [ actions.TABS_REOPEN],
   'h': [ actions.TABS_PREV, 1 ],
diff --git a/src/content/index.js b/src/content/index.js
index 6bf5d57..9dd3706 100644
--- a/src/content/index.js
+++ b/src/content/index.js
@@ -49,10 +49,16 @@ const invokeEvent = (action) => {
     scrolls.scrollPages(window, action[1]);
     break;
   case actions.SCROLL_TOP:
-    scrolls.scrollTop(window, action[1]);
+    scrolls.scrollTop(window);
     break;
   case actions.SCROLL_BOTTOM:
-    scrolls.scrollBottom(window, action[1]);
+    scrolls.scrollBottom(window);
+    break;
+  case actions.SCROLL_LEFT:
+    scrolls.scrollLeft(window);
+    break;
+  case actions.SCROLL_RIGHT:
+    scrolls.scrollRight(window);
     break;
   case actions.FOLLOW_START:
     new Follow(window.document, action[1] || false);
diff --git a/src/content/scrolls.js b/src/content/scrolls.js
index 540703e..bc88e43 100644
--- a/src/content/scrolls.js
+++ b/src/content/scrolls.js
@@ -25,4 +25,16 @@ const scrollBottom = (page) => {
   page.scrollTo(x, y);
 };
 
-export { scrollLines, scrollPages, scrollTop, scrollBottom }
+const scrollLeft = (page) => {
+  let x = 0;
+  let y = page.scrollY;
+  page.scrollTo(x, y);
+};
+
+const scrollRight = (page) => {
+  let x = page.scrollMaxX;
+  let y = page.scrollY;
+  page.scrollTo(x, y);
+};
+
+export { scrollLines, scrollPages, scrollTop, scrollBottom, scrollLeft, scrollRight }
diff --git a/src/shared/actions.js b/src/shared/actions.js
index b987026..cd740c2 100644
--- a/src/shared/actions.js
+++ b/src/shared/actions.js
@@ -9,6 +9,8 @@ export const SCROLL_LINES = 'scroll.lines';
 export const SCROLL_PAGES = 'scroll.pages';
 export const SCROLL_TOP = 'scroll.top';
 export const SCROLL_BOTTOM = 'scroll.bottom';
+export const SCROLL_LEFT= 'scroll.left';
+export const SCROLL_RIGHT= 'scroll.right';
 export const FOLLOW_START = 'follow.start';
 export const HISTORY_PREV = 'history.prev';
 export const HISTORY_NEXT = 'history.next';
@@ -34,6 +36,8 @@ const CONTENT_ACTION_SET = new Set([
   SCROLL_PAGES,
   SCROLL_TOP,
   SCROLL_BOTTOM,
+  SCROLL_LEFT,
+  SCROLL_RIGHT,
   FOLLOW_START,
   HISTORY_PREV,
   HISTORY_NEXT