Supply a default query on search

When opening the search dialog from a change list, use the current
query as the default value.  This lets you iterate on a query
without needing to type or copy it repeatedly.  However, it does
mean that you need to clear out the field if you want a completely
different query.

Change-Id: I1f31db1cde0b86c5a7b214866f1df686dd901c7c

gertty/app.py

@@ -128,7 +128,7 @@ class StatusHeader(urwid.WidgetWrap):
 
 class SearchDialog(mywid.ButtonDialog):
     signals = ['search', 'cancel']
-    def __init__(self, app):
+    def __init__(self, app, default):
         self.app = app
         search_button = mywid.FixedButton('Search')
         cancel_button = mywid.FixedButton('Cancel')
@@ -139,6 +139,7 @@ class SearchDialog(mywid.ButtonDialog):
         super(SearchDialog, self).__init__("Search",
                                            "Enter a change number or search string.",
                                            entry_prompt="Search: ",
+                                           entry_text=default,
                                            buttons=[search_button,
                                                     cancel_button])
 
@@ -435,8 +436,8 @@ class App(object):
         except gertty.view.DisplayError as e:
             return self.error(e.message)
 
-    def searchDialog(self):
-        dialog = SearchDialog(self)
+    def searchDialog(self, default):
+        dialog = SearchDialog(self, default)
         urwid.connect_signal(dialog, 'cancel',
             lambda button: self.backScreen())
         urwid.connect_signal(dialog, 'search',
@@ -514,7 +515,11 @@ class App(object):
         elif keymap.QUIT in commands:
             self.quit()
         elif keymap.CHANGE_SEARCH in commands:
-            self.searchDialog()
+            if hasattr(self.loop.widget, 'getQueryString'):
+                default = self.loop.widget.getQueryString()
+            else:
+                default = ''
+            self.searchDialog(default)
         elif keymap.LIST_HELD in commands:
             self.doSearch("status:open is:held")
         elif key in self.config.dashboards:

gertty/view/change_list.py

@@ -290,6 +290,11 @@ class ChangeListView(urwid.WidgetWrap):
             row = self.change_rows[key]
             del self.change_rows[key]
 
+    def getQueryString(self):
+        if self.project_key is not None:
+            return "project:%s %s" % (self.query_desc, self.app.config.project_change_list_query)
+        return self.query
+
     def _threadChanges(self, changes):
         ret = []
         prefixes = {}