git-rprune

#!/bin/bash
# Source: http://stackoverflow.com/questions/13064613/git-how-to-prune-local-tracking-branches-that-do-not-exist-on-remote-anymore

contains()
{
    needle=$1
    shift
    for elem
    do
	[ "$needle" = "$elem" ] && return 0
    done
    return 1
}

printUsage()
{
    cat <<HELPTEXT
Remove old local branches that do not exist in ${remote:-REMOTE} any more.
Leaves local branches that have never been published to ${remote:-REMOTE} intact.
With --test, only print which local branches would be deleted.
Note: To do this automatically on each fetch / pull:
    git config --global fetch.prune true
HELPTEXT
    echo
    printf 'Usage: %q %s\n' "$(basename "$1")" "${remote:-REMOTE} [-t|--test|-f|--force]  [-?|-h|--help]"
    echo
    cat <<HELPTEXT
Remove old branches in ${remote:-REMOTE} that have no corresponding local branch any
longer.
With --test, only print which ${remote:-REMOTE} branches would be deleted.
HELPTEXT
    echo
    printf 'Usage: %q %s\n' "$(basename "$1")" "${remote:-REMOTE} -R|--reverse [-t|--test|-f|--force] [-y|--yes]"
}
case "$1" in
    --help|-h|-\?)	shift; printUsage "$0"; exit 0;;
    --no-color|--color=*)
			shift;;
    --color)		shift; shift;;
esac

remote="${1:?}"; shift

action=
branchDeleteOption=-d
isReverse=
typeset -a gitRemoteMutateArgs=()
while [ $# -ne 0 ]
do
    case "$1" in
	--help|-h|-\?)	shift; printUsage "$0"; exit 0;;
	--no-color|--color=*)
			shift;;
	--color)	shift; shift;;
	--reverse|-R)	shift; isReverse=t;;
	--force|-f)	shift; branchDeleteOption=-D;;
	--yes|-y)	gitRemoteMutateArgs+=("$1"); shift;;
	--test|-t)	shift; action=dryRun;;
	--)		shift; break;;
	-*)		{ echo "ERROR: Unknown option \"$1\"!"; echo; printUsage "$0"; } >&2; exit 2;;
	*)		break;;
    esac
done
if [ $# -ne 0 ]; then
    printUsage "$0" >&2
    exit 2
fi

deleteLocalBranch()
{
    local localBranch="${1:?}"; shift
    git branch $branchDeleteOption "$localBranch"
}
deleteRemoteBranches()
{
    git-remote-mutate "$remote" --message 'Delete branch(es)' --arguments "${@#${remote}/}" \; "${gitRemoteMutateArgs[@]}" \
	push "$remote" --delete "${@#${remote}/}"
}
dryRun()
{
    printf 'Prune %s\n' "$@"
}

readarray -t remoteBranches < <(git-rbr "$remote")
readarray -t localBranches < <(git-br)

if [ "$isReverse" ]; then
    typeset -a oldRemoteBranches=()
    for remoteBranch in "${remoteBranches[@]}"
    do
	contains "${remoteBranch#${remote}/}" "${localBranches[@]}" || \
	    oldRemoteBranches+=("$remoteBranch")
    done
    if [ ${#oldRemoteBranches[@]} -eq 0 ]; then
	exit 99
    else
	${action:-deleteRemoteBranches} "${oldRemoteBranches[@]}"
    fi
else
    status=
    for localBranch in "${localBranches[@]}"
    do
	trackedRemote="$(git config "branch.${localBranch}.remote" 2>/dev/null)"
	if [ "$trackedRemote" = "$remote" ]; then
	    trackedBranch="$(git config "branch.${localBranch}.merge")"
	    if ! contains "${remote}/${trackedBranch##refs/heads/}" "${remoteBranches[@]}"; then
		${action:-deleteLocalBranch} "$localBranch" && : ${status:=0} || status=$?
	    fi
	fi
    done
    exit ${status:-99}
fi