Add new commands to menu and command list

Context menu: remove "get list" command, as it's available in command
palette and main menu.

Added new gist view commands: rename file, change gist description,
delete file, delete gist. Commands themselves are not implemented yet.

Main menu: split the Gist submenu into two logical blocks - commands
that are always enabled (create gist/open gist) and gist view commands.

Context.sublime-menu

@@ -1,5 +1,4 @@
 [
-    { "command": "gist", "caption": "Create Public Gist" },
-    { "command": "gist_private", "caption": "Create Private Gist" },
-    { "command": "gist_list", "caption": "Get Gist List" }
+    { "command": "gist", "caption": "Create Public Gist…" },
+    { "command": "gist_private", "caption": "Create Private Gist…" }
 ]

Gist.sublime-commands

@@ -1,12 +1,16 @@
 [
     {
-        "caption": "Gist (public): Create from Selected Text",
+        "caption": "Gist: Create Public Gist",
         "command": "gist"
     },
     {
-        "caption": "Gist (private): Create from Selected Text",
+        "caption": "Gist: Create Private Gist",
         "command": "gist_private"
     },
+    {
+        "caption": "Gist: Open Gist",
+        "command": "gist_list"
+    },
     {
         "caption": "Gist: Copy Gist URL",
         "command": "gist_copy_url"
@@ -20,7 +24,19 @@
         "command": "gist_update"
     },
     {
-        "caption": "Gist: Get List",
-        "command": "gist_list"
+        "caption": "Gist: Rename File",
+        "command": "gist_rename_file"
+    },
+    {
+        "caption": "Gist: Change Gist Description",
+        "command": "gist_rename"
+    },
+    {
+        "caption": "Gist: Delete Gist File",
+        "command": "gist_delete_file"
+    },
+    {
+        "caption": "Gist: Delete Gist",
+        "command": "gist_delete"
     }
 ]

Main.sublime-menu

@@ -9,12 +9,16 @@
                 "caption": "Gist",
                 "children":
                 [
-                    { "command": "gist", "caption": "Create Public Gist" },
-                    { "command": "gist_private", "caption": "Create Private Gist" },
+                    { "command": "gist", "caption": "Create Public Gist…" },
+                    { "command": "gist_private", "caption": "Create Private Gist…" },
+                    { "command": "gist_list", "caption": "Open Gist…" },
+                    { "caption": "-" },
                     { "command": "gist_copy_url", "caption": "Copy Gist URL" },
                     { "command": "gist_open_browser", "caption": "Open Gist In Browser"},
                     { "command": "gist_update", "caption": "Update Gist" },
-                    { "command": "gist_list", "caption": "Get Gist List" }
+                    { "command": "gist_rename_file", "caption": "Rename File…" },
+                    { "command": "gist_rename", "caption": "Change Gist Description…" },
+                    { "command": "gist_delete", "caption": "Delete Gist" }
                 ]
             }
 

gist.py

@@ -264,24 +264,20 @@ def on_gist_description(description):
         for region in selections:
             create_gist_with_text(self.view.substr(region))
 
-class GistCopyUrl(sublime_plugin.TextCommand):
+class GistViewCommand(object):
+    """A base class for commands operating on a gistified view"""
     def is_enabled(self):
-        return self.view.settings().get("gist_html_url") is not None
+        return self.view.settings().get("gist_url") is not None
 
+class GistCopyUrl(GistViewCommand, sublime_plugin.TextCommand):
     def run(self, edit):
         sublime.set_clipboard(self.view.settings().get("gist_html_url"))
 
-class GistOpenBrowser(sublime_plugin.TextCommand):
-    def is_enabled(self):
-        return self.view.settings().get("gist_html_url") is not None
-
+class GistOpenBrowser(GistViewCommand, sublime_plugin.TextCommand):
     def run(self, edit):
         webbrowser.open(self.view.settings().get("gist_html_url"))
 
-class GistUpdateCommand(sublime_plugin.TextCommand):
-    def is_enabled(self):
-        return self.view.settings().get("gist_url") is not None
-
+class GistUpdateCommand(GistViewCommand, sublime_plugin.TextCommand):
     @catch_errors
     def run(self, edit):
         text = self.view.substr(sublime.Region(0, self.view.size()))