zshrc: Switch to vi mode with some emacs bindings

This provides the best of both worlds.

zshrc

@@ -17,7 +17,19 @@ FEMALE="no"	# Whether the user is female ;)
 LISTMAX=32768
 WORDCHARS="*?[];!#~"
 
-bindkey -e
+bindkey -v
+# history-incremental-search-backward is much more useful than
+# _history-complete-*
+bindkey "^R" history-incremental-search-backward
+# Add a few other emacs bindings for convenience, as it's sometimes quicker to
+# use those than to switch between modes.
+bindkey "^A" beginning-of-line
+bindkey "^E" end-of-line
+bindkey "^D" delete-char-or-list
+# backward-kill-word behaves more like vim, whereas vi-backward-kill-word is
+# the vi behaviour.
+bindkey "^W" backward-kill-word
+
 setopt no_bg_nice
 setopt no_nomatch
 setopt extended_glob