[editor] Add 'gg' and 'G' to vicmd mode

G Moves to the start of the last line if no numeric argument. Otherwise goes
to the line number. 9G goes to the 9th line. 1G to the 1st line.

By default "gg" is bound to beginning-of-buffer-or-history for viins, which
causes inconsistent things to happen (moving to the first history entry).
Bind move-to-buffer-beginning so it acts more like vim

modules/editor/init.zsh

@@ -240,6 +240,26 @@ function glob-alias {
 }
 zle -N glob-alias
 
+# Moves to the beginning of the buffer (as opposed to beginning of the line)
+function zle-move-to-buffer-beginning {
+  CURSOR=0
+}
+zle -N zle-move-to-buffer-beginning
+
+# Moves to the specified line number. In vi mode number is supplied first,
+# then the bound key
+function zle-move-to-line {
+  if [[ $NUMERIC ]]; then
+    CURSOR=0
+    NUMERIC=$(( $NUMERIC - 1 ))
+    zle down-line
+  else
+    CURSOR=$(( ${#BUFFER} - 1 ))
+    zle vi-beginning-of-line
+  fi
+}
+zle -N zle-move-to-line
+
 # Reset to default key bindings.
 bindkey -d
 
@@ -294,6 +314,15 @@ else
   bindkey -M vicmd "/" history-incremental-search-forward
 fi
 
+# G Moves to the start of the last line if no numeric argument. Otherwise goes
+# to the line number. 9G goes to the 9th line. 1G to the 1st line.
+bindkey -M vicmd "G"  zle-move-to-line
+
+# By default "gg" is bound to beginning-of-buffer-or-history for viins, which
+# causes inconsistent things to happen (moving to the first history entry).
+# Bind move-to-buffer-beginning so it acts more like vim
+bindkey -M vicmd "gg" zle-move-to-buffer-beginning
+
 #
 # Emacs and Vi Key Bindings
 #