Map and unmap keys on debugger start/close, as per #1

Run and set breakpoint keys are available when Vim starts, but all other
key maps are set when the debugger is started, and unmapped when the GUI
is closed. Also, a leader key can be set with g:vdebug_leader_key

plugin/python/vdebug/runner.py

@@ -20,6 +20,8 @@ def __init__(self):
         self.api = None
         vdebug.opts.Options.set(vim.eval('g:vdebug_options'))
         self.breakpoints = vdebug.breakpoint.Store()
+        self.keymapper = vdebug.util.Keymapper()
+        self.keymapper.map()
         self.ui = vdebug.ui.vimui.Ui(self.breakpoints)
 
     def open(self):
@@ -296,3 +298,4 @@ def close(self):
         """
         self.close_connection()
         self.ui.close()
+        self.keymapper.unmap()

plugin/python/vdebug/util.py

@@ -1,7 +1,32 @@
 import vdebug.opts
 import vdebug.log
+import vim
 import sys
 
+class Keymapper:
+    """Map and unmap key commands for the Vim user interface.
+    """
+
+    exclude = ["run","set_breakpoint"]
+
+    def __init__(self):
+        self.keymaps = vim.eval("g:vdebug_keymap")
+        self.leader = vim.eval("g:vdebug_leader_key")
+
+    def map(self):
+        for func in self.keymaps:
+            key = self.keymaps[func]
+            if key not in self.exclude:
+                map_cmd = "map %s%s :python debugger.%s()<cr>" %\
+                    (self.leader,key,func)
+                vim.command(map_cmd)
+
+    def unmap(self):
+        for func in self.keymaps:
+            key = self.keymaps[func]
+            if key not in self.exclude:
+                vim.command("unmap %s%s" %(self.leader,key))
+
 class FilePath:
     """Normalizes a file name and allows for remote and local path mapping.
     """

plugin/vdebug.vim

@@ -41,8 +41,6 @@ else
   endif
 endif
 
-python debugger = DebuggerInterface()
-
 if !exists("g:vdebug_options")
     let g:vdebug_options = {}
 endif
@@ -79,10 +77,12 @@ let g:vdebug_options_defaults = {
 
 let g:vdebug_options = extend(g:vdebug_options_defaults,g:vdebug_options)
 let g:vdebug_keymap = extend(g:vdebug_keymap_defaults,g:vdebug_keymap)
+let g:vdebug_leader_key = ""
+
+python debugger = DebuggerInterface()
 
-for [s:fname, s:key] in items(g:vdebug_keymap)
-    exe "map ".s:key." :python debugger.".s:fname."()<cr>"
-endfor
+exe "map ".g:vdebug_keymap["run"]." :python debugger.run()<cr>"
+exe "map ".g:vdebug_keymap["set_breakpoint"]." :python debugger.set_breakpoint()<cr>"
 
 vnoremap <Leader>e :python debugger.handle_visual_eval()<cr>