1 files changed, 47 insertions, 0 deletions
diff --git a/lib/find_mode_history.coffee b/lib/find_mode_history.coffee
new file mode 100644
index 00000000..dd21a2b9
--- /dev/null
+++ b/lib/find_mode_history.coffee
@@ -0,0 +1,47 @@
+# NOTE(mrmr1993): This is under lib/ since it is used by both content scripts and iframes from pages/.
+# This implements find-mode query history (using the "findModeRawQueryList" setting) as a list of raw queries,
+# most recent first.
+FindModeHistory =
+  storage: chrome.storage.local
+  key: "findModeRawQueryList"
+  max: 50
+  rawQueryList: null
+  isIncognitoMode: chrome.extension.inIncognitoContext
+
+  init: ->
+    unless @rawQueryList
+      @rawQueryList = [] # Prevent repeated initialization.
+      @key = "findModeRawQueryListIncognito" if @isIncognitoMode
+      @storage.get @key, (items) =>
+        unless chrome.runtime.lastError
+          @rawQueryList = items[@key] if items[@key]
+          if @isIncognitoMode and not items[@key]
+            # This is the first incognito tab, so we need to initialize the incognito-mode query history.
+            @storage.get "findModeRawQueryList", (items) =>
+              unless chrome.runtime.lastError
+                @rawQueryList = items.findModeRawQueryList
+                @storage.set findModeRawQueryListIncognito: @rawQueryList
+
+    chrome.storage.onChanged.addListener (changes, area) =>
+      @rawQueryList = changes[@key].newValue if changes[@key]
+
+  getQuery: (index = 0) ->
+    @rawQueryList[index] or ""
+
+  saveQuery: (query) ->
+    if 0 < query.length
+      @rawQueryList = @refreshRawQueryList query, @rawQueryList
+      newSetting = {}; newSetting[@key] = @rawQueryList
+      @storage.set newSetting
+      # If there are any active incognito-mode tabs, then propagte this query to those tabs too.
+      unless @isIncognitoMode
+        @storage.get "findModeRawQueryListIncognito", (items) =>
+          if not chrome.runtime.lastError and items.findModeRawQueryListIncognito
+            @storage.set
+              findModeRawQueryListIncognito: @refreshRawQueryList query, items.findModeRawQueryListIncognito
+
+  refreshRawQueryList: (query, rawQueryList) ->
+    ([ query ].concat rawQueryList.filter (q) => q != query)[0..@max]
+
+root = exports ? window
+root.FindModeHistory = FindModeHistory