Cleanup

Binds some additional sequences to emacs-backward-word and
emacs-forward-word. The problem is that terminfo doesn't know about
Ctrl+ArrowKeys, so one has to resort to using raw sequences as used
in the wild. The sequences were copied from Debian's /etc/inputrc
(readline configuration), so they should be fairly portable.
It works in xterm and rxvt terminals and doesn't work on
TERM=linux (virtual console) as Ctrl+Arrows send the same sequence
as Arrows alone.

http://zshwiki.org/home/zle/bindkeys
http://sources.debian.net/src/readline6/6.2+dfsg-0.1/debian/inputrc?hl=44#L44

modules/editor/init.zsh

@@ -57,6 +57,17 @@ key_info=(
   'BackTab'   "$terminfo[kcbt]"
 )
 
+# Escape sequences from Debian's inputrc.
+key_info+=(
+  'ControlLeft' '\e[1;5D \e[5D \e\e[D \eOd'
+  'ControlRight' '\e[1;5C \e[5C \e\e[C \eOc'
+)
+
+# if [[ "$TERM" == rxvt* ]]; then
+#   key_info[ControlLeft]+=' \eOd'
+#   key_info[ControlRight]+=' \eOc'
+# fi
+
 # Set empty $key_info values to an invalid UTF-8 sequence to induce silent
 # bindkey failure.
 for key in "${(k)key_info[@]}"; do
@@ -206,10 +217,10 @@ bindkey -d
 # Emacs Key Bindings
 #
 
-for key ("$key_info[Escape]"{B,b}) bindkey -M emacs "$key" emacs-backward-word
-for key ("$key_info[Escape]"{F,f}) bindkey -M emacs "$key" emacs-forward-word
-bindkey -M emacs "$key_info[Escape]$key_info[Left]" emacs-backward-word
-bindkey -M emacs "$key_info[Escape]$key_info[Right]" emacs-forward-word
+for key in "$key_info[Escape]"{B,b} "${(s: :)key_info[ControlLeft]}"
+  bindkey -M emacs "$key" emacs-backward-word
+for key in "$key_info[Escape]"{F,f} "${(s: :)key_info[ControlRight]}"
+  bindkey -M emacs "$key" emacs-forward-word
 
 # Kill to the beginning of the line.
 for key in "$key_info[Escape]"{K,k}