From 2df5708976a2d6939d7300fad262cf37c9532cfe Mon Sep 17 00:00:00 2001
From: Patrick Totzke <patricktotzke@gmail.com>
Date: Sat, 1 Oct 2011 22:45:51 +0100
Subject: add HelpCommand

---
 alot/command.py       | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++
 alot/defaults/alot.rc |  1 +
 alot/ui.py            |  2 +-
 3 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/alot/command.py b/alot/command.py
index 5c689a55..721437c0 100644
--- a/alot/command.py
+++ b/alot/command.py
@@ -1063,6 +1063,64 @@ class TaglistSelectCommand(Command):
         ui.apply_command(cmd)
 
 
+class HelpCommand(Command):
+    def __init__(self, commandline='', **kwargs):
+        Command.__init__(self, **kwargs)
+        self.commandline = commandline.strip()
+
+    def apply(self, ui):
+        if self.commandline:
+            cmd = self.commandline.split(' ', 1)[0]
+            # TODO: how to I access COMMANDS from below?
+            ui.notify('no help for \'%s\'' % cmd, priority='error')
+            titletext = 'help for %s' % cmd
+            body = urwid.Text('helpstring')
+            return
+        else:
+            # get mappings
+            modemaps = dict(settings.config.items('%s-maps' % ui.mode))
+            globalmaps = dict(settings.config.items('global-maps'))
+
+            # build table
+            maxkeylength = len(max((modemaps).keys() + globalmaps.keys(),
+                                   key=len))
+            keycolumnwidth = maxkeylength + 2
+
+            linewidgets = []
+            # mode specific maps
+            linewidgets.append(urwid.Text(('helptexth1',
+                                '\n%s-mode specific maps' % ui.mode)))
+            for (k, v) in modemaps.items():
+                line = urwid.Columns([('fixed', keycolumnwidth, urwid.Text(k)),
+                                      urwid.Text(v)])
+                linewidgets.append(line)
+
+            # global maps
+            linewidgets.append(urwid.Text(('helptexth1',
+                                           '\nglobal maps')))
+            for (k, v) in globalmaps.items():
+                if k not in modemaps:
+                    line = urwid.Columns(
+                        [('fixed', keycolumnwidth, urwid.Text(k)),
+                         urwid.Text(v)])
+                    linewidgets.append(line)
+
+            body = urwid.ListBox(linewidgets)
+            urwidmaps = settings.config.items('urwid-maps')
+            ckey = [k for (k, v) in urwidmaps if v == 'cancel'][0] or 'esc'
+            titletext = 'Bindings Help (%s cancels)' % ckey
+
+        box = widgets.DialogBox(body, titletext,
+                                bodyattr='helptext',
+                                titleattr='helptitle')
+
+        # put promptwidget as overlay on main widget
+        overlay = urwid.Overlay(box, ui.mainframe, 'center',
+                                ('relative', 70), 'middle',
+                                ('relative', 70))
+        ui.show_as_root_until_keypress(overlay, 'cancel')
+
+
 COMMANDS = {
     'search': {
         'refine': (RefineCommand, {}),
@@ -1113,6 +1171,7 @@ COMMANDS = {
         'search': (SearchCommand, {}),
         'shellescape': (ExternalCommand, {}),
         'taglist': (TagListCommand, {}),
+        'help': (HelpCommand, {}),
     }
 }
 
@@ -1174,6 +1233,8 @@ def interpret_commandline(cmdline, mode):
         return commandfactory(cmd, mode=mode, headers=h)
     elif cmd == 'attach':
         return commandfactory(cmd, mode=mode, path=params)
+    elif cmd == 'help':
+        return commandfactory(cmd, mode=mode, commandline=params)
     elif cmd == 'forward':
         return commandfactory(cmd, mode=mode, inline=(params == '--inline'))
     elif cmd == 'prompt':
diff --git a/alot/defaults/alot.rc b/alot/defaults/alot.rc
index e72f28d5..bf732994 100644
--- a/alot/defaults/alot.rc
+++ b/alot/defaults/alot.rc
@@ -71,6 +71,7 @@ esc = cancel
 
 [global-maps]
 @ = refresh
+? = help
 I = search tag:inbox AND NOT tag:killed
 L = taglist
 shift tab = bprevious
diff --git a/alot/ui.py b/alot/ui.py
index 9fd3b7ab..ddf88b04 100644
--- a/alot/ui.py
+++ b/alot/ui.py
@@ -82,7 +82,7 @@ class UI(object):
     def keypress(self, key):
         self.logger.debug('unhandeled input: %s' % key)
 
-    def show_as_root_until_keypress_(self, w, key):
+    def show_as_root_until_keypress(self, w, key):
         def oe():
             self.mainloop.widget = self.mainframe  # restore main screen
         self.mainloop.widget = widgets.CatchKeyWidgetWrap(w, key,
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