Add bash completion for git aliases

bash/aliases

@@ -8,15 +8,24 @@ alias lhal='ls -hal'
 alias ?='git status'
 alias ga='git add'
 alias gaa='git add .'
-alias gco='git checkout'
-alias gc='git commit'
-alias gpush='git push'
-alias gpull='git pull --ff-only'
-alias gfetch='git fetch -ap'
-alias gdiff='git diff'
-alias gmerge='git merge --ff-only'
-alias merged?='git branch --merged'
+alias gbc="git branch -vv | grep -e '[origin/[^:]*: gone]' | awk '{print \$1}' | xargs git branch -D"
 alias gbd='git branch -d'
+alias gc='git commit'
+alias gco='git checkout'
+alias gdiff='git diff'
+alias gfetch='git fetch -ap'
+alias gmerge='git merge --ff-only'
+alias gpull='git pull --ff-only'
+alias gpush='git push'
 alias gpush!='git push -u origin `git rev-parse --abbrev-ref HEAD`'
 alias master!='git checkout master'
-alias gbc="git branch -vv | grep -e '[origin/[^:]*: gone]' | awk '{print \$1}' | xargs git branch -D"
+alias merged?='git branch --merged'
+
+__git_complete ga _git_add
+__git_complete gc _git_commit
+__git_complete gco _git_checkout
+__git_complete gdiff _git_fetch
+__git_complete gfetch _git_fetch
+__git_complete gmerge _git_merge
+__git_complete gpull _git_pull
+__git_complete gpush _git_push