From 4ada22e85dcd061fa806a5fe72a9dc3f1cfe0442 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Tue, 9 Feb 2016 15:28:50 +0000
Subject: BgUtils; move tabRecency to bg_tiles.coffee.

Certain background-page utilities are actually shared, and are therefore
best placed in place that reflects that.

Here, tabRecency is moved to the new gb_utils.coffee in preparation for
implementing a go-to-previous-tab command.  In particular, it is no
longer appropriate that tabRecency be embedded within the completion
code.

logMessage() from main.coffee is also a candidate for moving to
bg_utils.coffee.
---
 background_scripts/bg_utils.coffee | 45 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 background_scripts/bg_utils.coffee

(limited to 'background_scripts/bg_utils.coffee')

diff --git a/background_scripts/bg_utils.coffee b/background_scripts/bg_utils.coffee
new file mode 100644
index 00000000..9c1674bf
--- /dev/null
+++ b/background_scripts/bg_utils.coffee
@@ -0,0 +1,45 @@
+root = exports ? window
+
+# TabRecency associates a logical timestamp with each tab id.  These are used to provide an initial
+# recency-based ordering in the tabs vomnibar (which allows jumping quickly between recently-visited tabs).
+class TabRecency
+  timestamp: 1
+  current: -1
+  cache: {}
+  lastVisited: null
+  lastVisitedTime: null
+  timeDelta: 500 # Milliseconds.
+
+  constructor: ->
+    chrome.tabs.onActivated.addListener (activeInfo) => @register activeInfo.tabId
+    chrome.tabs.onRemoved.addListener (tabId) => @deregister tabId
+
+    chrome.tabs.onReplaced.addListener (addedTabId, removedTabId) =>
+      @deregister removedTabId
+      @register addedTabId
+
+  register: (tabId) ->
+    currentTime = new Date()
+    # Register tabId if it has been visited for at least @timeDelta ms.  Tabs which are visited only for a
+    # very-short time (e.g. those passed through with `5J`) aren't registered as visited at all.
+    if @lastVisitedTime? and @timeDelta <= currentTime - @lastVisitedTime
+      @cache[@lastVisited] = ++@timestamp
+
+    @current = @lastVisited = tabId
+    @lastVisitedTime = currentTime
+
+  deregister: (tabId) ->
+    if tabId == @lastVisited
+      # Ensure we don't register this tab, since it's going away.
+      @lastVisited = @lastVisitedTime = null
+    delete @cache[tabId]
+
+  # Recently-visited tabs get a higher score (except the current tab, which gets a low score).
+  recencyScore: (tabId) ->
+    @cache[tabId] ||= 1
+    if tabId == @current then 0.0 else @cache[tabId] / @timestamp
+
+BgUtils =
+  tabRecency: new TabRecency()
+
+root.BgUtils = BgUtils
-- 
cgit v1.2.3


From 60d33d20026cdcdd0c4ecef20410d38341c86633 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Tue, 9 Feb 2016 15:55:49 +0000
Subject: BgUtils; implement visitPreviousTab.

Implements visitPreviousTab (as discussed in #1955).
---
 background_scripts/bg_utils.coffee | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'background_scripts/bg_utils.coffee')

diff --git a/background_scripts/bg_utils.coffee b/background_scripts/bg_utils.coffee
index 9c1674bf..bd00fd24 100644
--- a/background_scripts/bg_utils.coffee
+++ b/background_scripts/bg_utils.coffee
@@ -39,6 +39,13 @@ class TabRecency
     @cache[tabId] ||= 1
     if tabId == @current then 0.0 else @cache[tabId] / @timestamp
 
+  # Get the tab Id of the count-th most recently visited tab (excluding tabId, which is the current tab).
+  getRecentTab: (tabId, count) ->
+    tabId = tabId.toString()
+    tabIds = (tId for own tId of @cache when tId != tabId)
+    tabIds.sort (a,b) => @cache[b] - @cache[a]
+    parseInt tabIds[(count-1)%tabIds.length]
+
 BgUtils =
   tabRecency: new TabRecency()
 
-- 
cgit v1.2.3


From 1d809afe18d8638b899a1016d9cca0ccc4a32253 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Wed, 10 Feb 2016 06:26:55 +0000
Subject: BgUtils; two fixes...

- handle case where there's only one tab
- also focus the selected tab's window
---
 background_scripts/bg_utils.coffee | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

(limited to 'background_scripts/bg_utils.coffee')

diff --git a/background_scripts/bg_utils.coffee b/background_scripts/bg_utils.coffee
index bd00fd24..96c1282a 100644
--- a/background_scripts/bg_utils.coffee
+++ b/background_scripts/bg_utils.coffee
@@ -39,12 +39,11 @@ class TabRecency
     @cache[tabId] ||= 1
     if tabId == @current then 0.0 else @cache[tabId] / @timestamp
 
-  # Get the tab Id of the count-th most recently visited tab (excluding tabId, which is the current tab).
-  getRecentTab: (tabId, count) ->
-    tabId = tabId.toString()
-    tabIds = (tId for own tId of @cache when tId != tabId)
+  # Returns a list of tab Ids sorted by recency, most recent tab first.
+  getTabsByRecency: ->
+    tabIds = (tId for own tId of @cache)
     tabIds.sort (a,b) => @cache[b] - @cache[a]
-    parseInt tabIds[(count-1)%tabIds.length]
+    tabIds.map (tId) -> parseInt tId
 
 BgUtils =
   tabRecency: new TabRecency()
-- 
cgit v1.2.3