Genericize the change list and add inter-change links

Make the change list display not only changes for a project, but
any arbitrary set of changes represented by a query.  This will
enable searching, inter-change linking, and custom dashboards.

The search syntax is extremly basic at the moment, but will be
extended to attempt to match the Gerrit webui search syntax as
closely as possible.

Use the new feature to implement a new kind of commentlink that
matches on Iabcdef style change-ids to "search" for matching
changes.

Change-Id: Icbcb166962fd96718ab56eb4118fc5ea43a4ba8b

gertty/app.py

@@ -1,4 +1,5 @@
 # Copyright 2014 OpenStack Foundation
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
@@ -192,6 +193,22 @@ class App(object):
             lambda button: self.backScreen())
         self.popup(dialog, min_width=76, min_height=len(lines)+4)
 
+    def search(self, query):
+        self.log.debug("Search query: %s" % query)
+        with self.db.getSession() as session:
+            changes = session.getChanges(query)
+            change_key = None
+            if len(changes) == 1:
+                change_key = changes[0].key
+        try:
+            if change_key:
+                view = view_change.ChangeView(self, change_key)
+            else:
+                view = view_change_list.ChangeListView(self, query)
+            self.changeScreen(view)
+        except gertty.view.DisplayError as e:
+            self.error(e.message)
+
     def openChange(self):
         dialog = OpenChangeDialog()
         urwid.connect_signal(dialog, 'cancel',
@@ -231,7 +248,7 @@ class App(object):
             view = view_change.ChangeView(self, change_key)
             self.changeScreen(view)
         except gertty.view.DisplayError as e:
-            self.app.error(e.message)
+            self.error(e.message)
 
     def error(self, message):
         dialog = mywid.MessageDialog('Error', message)

gertty/commentlink.py

@@ -43,6 +43,17 @@ class LinkReplacement(object):
             lambda link:app.openURL(self.url.format(**data)))
         return link
 
+class SearchReplacement(object):
+    def __init__(self, config):
+        self.query = config['query']
+        self.text = config['text']
+
+    def replace(self, app, data):
+        link = mywid.Link(self.text.format(**data), 'link', 'focused-link')
+        urwid.connect_signal(link, 'selected',
+            lambda link:app.search(self.query.format(**data)))
+        return link
+
 class CommentLink(object):
     def __init__(self, config):
         self.match = re.compile(config['match'], re.M)
@@ -52,6 +63,8 @@ class CommentLink(object):
                 self.replacements.append(TextReplacement(r['text']))
             if 'link' in r:
                 self.replacements.append(LinkReplacement(r['link']))
+            if 'search' in r:
+                self.replacements.append(SearchReplacement(r['search']))
 
     def run(self, app, chunks):
         ret = []

gertty/config.py

@@ -43,7 +43,10 @@ class ConfigSchema(object):
     link_replacement = {'link': {v.Required('url'): str,
                                  v.Required('text'): str}}
 
-    replacement = v.Any(text_replacement, link_replacement)
+    search_replacement = {'search': {v.Required('query'): str,
+                                     v.Required('text'): str}}
+
+    replacement = v.Any(text_replacement, link_replacement, search_replacement)
 
     palette = {v.Required('name'): str,
                v.Match('(?!name)'): [str]}

gertty/db.py

@@ -1,4 +1,5 @@
 # Copyright 2014 OpenStack Foundation
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
@@ -435,6 +436,25 @@ class DatabaseSession(object):
         except sqlalchemy.orm.exc.NoResultFound:
             return None
 
+    def getChanges(self, query, unreviewed=False):
+        #TODO(jeblair): use a real parser that supports the full gerrit query syntax
+        q = self.session().query(Change)
+        for term in query.split():
+            key, data = term.split(':')
+            if key == 'changeid':
+                q = q.filter(change_table.c.change_id==data)
+            elif key == 'project_key':
+                q = q.filter(change_table.c.project_key==data)
+            elif key == 'status':
+                if data == 'open':
+                    q = q.filter(change_table.c.status.notin_(['MERGED', 'ABANDONED']))
+        if unreviewed:
+            q = q.filter(change_table.c.hidden==False, change_table.c.reviewed==False)
+        try:
+            return q.order_by(change_table.c.number).all()
+        except sqlalchemy.orm.exc.NoResultFound:
+            return []
+
     def getRevision(self, key):
         try:
             return self.session().query(Revision).filter_by(key=key).one()

gertty/view/change_list.py

@@ -1,4 +1,5 @@
 # Copyright 2014 OpenStack Foundation
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
@@ -74,11 +75,12 @@ This Screen
 <v>   Toggle the reviewed flag for the currently selected change.
 """
 
-    def __init__(self, app, project_key):
+    def __init__(self, app, query, query_desc=None, unreviewed=True):
         super(ChangeListView, self).__init__(urwid.Pile([]))
         self.app = app
-        self.project_key = project_key
-        self.unreviewed = True
+        self.query = query
+        self.query_desc = query_desc or query
+        self.unreviewed = unreviewed
         self.change_rows = {}
         self.listbox = urwid.ListBox(urwid.SimpleFocusListWalker([]))
         self.header = ChangeListHeader()
@@ -92,14 +94,11 @@ This Screen
     def refresh(self):
         unseen_keys = set(self.change_rows.keys())
         with self.app.db.getSession() as session:
-            project = session.getProject(self.project_key)
-            self.project_name = project.name
+            lst = session.getChanges(self.query, self.unreviewed)
             if self.unreviewed:
-                self.title = u'Unreviewed changes in %s' % project.name
-                lst = project.unreviewed_changes
+                self.title = u'Unreviewed changes in %s' % self.query_desc
             else:
-                self.title = u'Open changes in %s' % project.name
-                lst = project.open_changes
+                self.title = u'Open changes in %s' % self.query_desc
             self.app.status.update(title=self.title)
             i = 0
             for change in lst:
@@ -112,8 +111,8 @@ This Screen
                     row.update(change)
                     unseen_keys.remove(change.key)
                 i += 1
-            if project.changes:
-                self.header.update(project.changes[0])
+            if lst:
+                self.header.update(lst[0])
         for key in unseen_keys:
             row = self.change_rows[key]
             self.listbox.body.remove(row)

gertty/view/project_list.py

@@ -1,4 +1,5 @@
 # Copyright 2014 OpenStack Foundation
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
@@ -29,7 +30,8 @@ class ProjectRow(urwid.Button):
         return True
 
     def __init__(self, project, callback=None):
-        super(ProjectRow, self).__init__('', on_press=callback, user_data=project.key)
+        super(ProjectRow, self).__init__('', on_press=callback,
+                                         user_data=(project.key, project.name))
         self.project_key = project.key
         name = urwid.Text(project.name)
         name.set_wrap_mode('clip')
@@ -121,8 +123,12 @@ This Screen
             ret = project.subscribed
         return ret
 
-    def onSelect(self, button, project_key):
-        self.app.changeScreen(view_change_list.ChangeListView(self.app, project_key))
+    def onSelect(self, button, data):
+        project_key, project_name = data
+        self.app.changeScreen(view_change_list.ChangeListView(
+                self.app,
+                "project_key:%s status:open" % project_key,
+                project_name, unreviewed=True))
 
     def keypress(self, size, key):
         if key=='l':