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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
chrome.windows.onFocusChanged.addListener (wnd) =>
if wnd != chrome.windows.WINDOW_ID_NONE
chrome.tabs.query {windowId: wnd, active: true}, (tabs) =>
@register tabs[0].id if tabs[0]
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
# 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]
tabIds.map (tId) -> parseInt tId
BgUtils =
tabRecency: new TabRecency()
root.BgUtils = BgUtils
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