Make vi bindings inherit the defaults

This reduces code duplication and adds some previously unavailable
bindings that don't quite _violate_ the vi-principle (like
prevd-or-backward-word on alt-left) and matches other "impure" bindings
like \cf for forward-word (a quite emacs-ish binding) we already have.

Fixes #2412
Fixes #2472
Fixes #2255

doc_src/index.hdr.in

@@ -912,7 +912,7 @@ You can change these key bindings using the <a href="commands.html#bind">bind</a
 
 \subsection vi-mode Vi mode commands
 
-Vi mode allows for the use of Vi-like commands at the prompt. Initially, <a href="#vi-mode-insert">insert mode</a> is active. @key{Escape} enters <a href="#vi-mode-command">command mode</a>. The commands available in command, insert and visual mode are described below.
+Vi mode allows for the use of Vi-like commands at the prompt. Initially, <a href="#vi-mode-insert">insert mode</a> is active. @key{Escape} enters <a href="#vi-mode-command">command mode</a>. The commands available in command, insert and visual mode are described below. Vi mode builds on top of <a href="#emacs-mode">Emacs mode</a>, so all keybindings mentioned there that do not contradict the ones mentioned here also work.
 
 \subsubsection vi-mode-command Command mode
 

share/functions/fish_vi_key_bindings.fish

@@ -5,6 +5,14 @@ function fish_vi_key_bindings --description 'vi-like key bindings for fish'
     set init_mode $argv[1]
   end
 
+  # Inherit default key bindings
+  # Do this first so vi-bindings win over default
+  fish_default_key_bindings -M insert
+  fish_default_key_bindings -M default
+
+  # Add a way to get out of insert mode
+  bind -M insert -m default \cc force-repaint
+  bind -M insert -m default \e backward-char force-repaint
 
   ##
   ## command mode
@@ -156,61 +164,6 @@ function fish_vi_key_bindings --description 'vi-like key bindings for fish'
   bind '"*p' "commandline -i ( xsel -p; echo )[1]"
   bind '"*P' backward-char "commandline -i ( xsel -p; echo )[1]"
 
-  #
-  # insert mode
-  #
-
-  bind -M insert "" self-insert
-  bind -M insert \n execute
-
-  bind -M insert -k dc delete-char
-
-  bind -M insert -k backspace backward-delete-char
-  bind -M insert \x7f backward-delete-char
-  # Mavericks Terminal.app shift-delete
-  bind -M insert \e\[3\;2~ backward-delete-char 
-
-  bind -M insert \t complete
-
-	# OS X SnowLeopard doesn't have these keys. Don't show an annoying error message.
-	bind -M insert -k home beginning-of-line 2> /dev/null
-	bind -M insert -k end end-of-line 2> /dev/null
-	bind -M insert \e\[3\;2~ backward-delete-char # Mavericks Terminal.app shift-delete
-
-	bind -M insert \cx end-of-line
-
-  bind -M insert \e\[A up-or-search
-  bind -M insert \e\[B down-or-search
-  bind -M insert -k down down-or-search
-  bind -M insert -k up up-or-search
-
-  # Some linux VTs output these (why?)
-  bind -M insert \eOA up-or-search
-  bind -M insert \eOB down-or-search
-  bind -M insert \eOC forward-char
-  bind -M insert \eOD backward-char
-
-  bind -M insert \e\[C forward-char
-  bind -M insert \e\[D backward-char
-  bind -M insert -k right forward-char
-  bind -M insert -k left backward-char
-
-  # useful insert mode mappings
-  bind -M insert \ch backward-delete-char
-  bind -M insert \cw backward-kill-word
-  bind -M insert \cu backward-kill-line
-  bind -M insert \cp history-search-backward
-  bind -M insert \cn history-search-forward
-  bind -M insert \cb backward-word
-  bind -M insert \cf forward-word
-
-  bind -M insert -m default \cc force-repaint
-  bind -M insert -m default \e backward-char force-repaint
-
-  bind -M insert \cd exit
-
-  bind -M insert \ef forward-word
-
   #
   # Lowercase r, enters replace-one mode
   #