support 0/$ commands

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 ],

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);

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 }

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