git-flow-feature

#
# git-flow -- A collection of Git extensions to provide high-level
# repository operations for Vincent Driessen's branching model.
#
# Original blog post presenting this model is found at:
#    http://nvie.com/git-model
#
# Feel free to contribute to this project at:
#    http://github.com/nvie/gitflow
#
# Copyright 2010 Vincent Driessen. All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
#    1. Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
# 
#    2. Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
# 
# THIS SOFTWARE IS PROVIDED BY VINCENT DRIESSEN ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL VINCENT DRIESSEN OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# 
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of Vincent Driessen.
#

init() {
  require_git_repo
  require_gitflow_initialized
  gitflow_load_settings
  PREFIX=$(git config --get gitflow.prefix.feature)
}

usage() {
	echo "usage: git flow feature [list] [-v]"
	echo "       git flow feature start [-F] <name> [<base>]"
	echo "       git flow feature publish <name>"
	echo "       git flow feature track <name>"
	echo "       git flow feature diff [<name|nameprefix>]"
	echo "       git flow feature rebase [-i] [<name|nameprefix>]"
	echo "       git flow feature checkout [<name|nameprefix>]"
	echo "       git flow feature pull [-r] <remote> [<name>]"
}

cmd_default() {
	cmd_list "$@"
}

cmd_list() {
	DEFINE_boolean verbose false 'verbose (more) output' v
	parse_args "$@"

	local feature_branches
	local current_branch
	local short_names
	feature_branches=$(echo "$(git_local_branches)" | grep "^$PREFIX")
	if [ -z "$feature_branches" ]; then
		warn "No feature branches exist."
		warn ""
		warn "You can start a new feature branch:"
		warn ""
		warn "    git flow feature start <name> [<base>]"
		warn ""
		exit 0
	fi
	current_branch=$(git branch --no-color | grep '^\* ' | grep -v 'no branch' | sed 's/^* //g')
	short_names=$(echo "$feature_branches" | sed "s ^$PREFIX  g")

	# determine column width first
	local width=0
	local branch
	for branch in $short_names; do
		local len=${#branch}
		width=$(max $width $len)
	done
	width=$(($width+3))

	local branch
	for branch in $short_names; do
		local fullname=$PREFIX$branch
		local base=$(git merge-base "$fullname" "$MASTER_BRANCH")
		local branch_sha=$(git rev-parse "$fullname")
		if [ "$fullname" = "$current_branch" ]; then
			printf "* "
		else
			printf "  "
		fi

        printf "%s" "$branch"

		echo
	done
}

cmd_help() {
	usage
	exit 0
}

require_name_arg() {
	if [ "$NAME" = "" ]; then
		warn "Missing argument <name>"
		usage
		exit 1
	fi
}

expand_nameprefix_arg() {
	require_name_arg

	local expanded_name
	local exitcode
	expanded_name=$(gitflow_resolve_nameprefix "$NAME" "$PREFIX")
	exitcode=$?
	case $exitcode in
		0) NAME=$expanded_name
		   BRANCH=$PREFIX$NAME
		   ;;
		*) exit 1 ;;
	esac
}

use_current_feature_branch_name() {
	local current_branch=$(git_current_branch)
	if startswith "$current_branch" "$PREFIX"; then
		BRANCH=$current_branch
		NAME=${BRANCH#$PREFIX}
	else
		warn "The current HEAD is no feature branch."
		warn "Please specify a <name> argument."
		exit 1
	fi
}

expand_nameprefix_arg_or_current() {
	if [ "$NAME" != "" ]; then
		expand_nameprefix_arg
		require_branch "$PREFIX$NAME"
	else
		use_current_feature_branch_name
	fi
}

name_or_current() {
	if [ -z "$NAME" ]; then
		use_current_feature_branch_name
	fi
}

parse_args() {
	# parse options
	FLAGS "$@" || exit $?
	eval set -- "${FLAGS_ARGV}"

	# read arguments into global variables
	NAME=$1
	BRANCH=$PREFIX$NAME
}

parse_remote_name() {
	# parse options
	FLAGS "$@" || exit $?
	eval set -- "${FLAGS_ARGV}"

	# read arguments into global variables
	REMOTE=$1
	NAME=$2
	BRANCH=$PREFIX$NAME
}

cmd_start() {
	DEFINE_boolean fetch false 'fetch from origin before performing local operation' F
	parse_args "$@"
	BASE=${2:-$MASTER_BRANCH}
	require_name_arg

	# sanity checks
	require_branch_absent "$BRANCH"

	# update the local repo with remote changes, if asked
	if flag fetch; then
		git_do fetch -q "$ORIGIN" "$MASTER_BRANCH"
	fi

	# if the origin branch counterpart exists, assert that the local branch
	# isn't behind it (to avoid unnecessary rebasing)
	if git_branch_exists "$ORIGIN/$MASTER_BRANCH"; then
		require_branches_equal "$MASTER_BRANCH" "$ORIGIN/$MASTER_BRANCH"
	fi

	# create branch
	if ! git_do checkout -b "$BRANCH" "$BASE"; then
		die "Could not create feature branch '$BRANCH'"
	fi

    # create remote branch
    git_do push "$ORIGIN" "$BRANCH:refs/heads/$BRANCH"
    git_do fetch -q "$ORIGIN"

    # configure remote tracking
    git_do config "branch.$BRANCH.remote" "$ORIGIN"
    git_do config "branch.$BRANCH.merge" "refs/heads/$BRANCH"
    git_do checkout "$BRANCH"

	echo
	echo "Summary of actions:"
	echo "- A new branch '$BRANCH' was created, based on '$BASE'"
	echo "- A new remote branch '$BRANCH' was created"
    echo "- The local branch '$BRANCH' was configured to track the remote branch"
	echo "- You are now on branch '$BRANCH'"
	echo ""
	echo "- Now, start committing on your feature. When done, use:"
	echo "- Create a merge request in GitLab to merge it to the $MASTER_BRANCH"
	echo
}

cmd_publish() {
	parse_args "$@"
	expand_nameprefix_arg

	# sanity checks
	require_clean_working_tree
	require_branch "$BRANCH"
	git_do fetch -q "$ORIGIN"
	require_branch_absent "$ORIGIN/$BRANCH"

	# create remote branch
	git_do push "$ORIGIN" "$BRANCH:refs/heads/$BRANCH"
	git_do fetch -q "$ORIGIN"

	# configure remote tracking
	git_do config "branch.$BRANCH.remote" "$ORIGIN"
	git_do config "branch.$BRANCH.merge" "refs/heads/$BRANCH"
	git_do checkout "$BRANCH"

	echo
	echo "Summary of actions:"
	echo "- A new remote branch '$BRANCH' was created"
	echo "- The local branch '$BRANCH' was configured to track the remote branch"
	echo "- You are now on branch '$BRANCH'"
	echo
}

cmd_track() {
	parse_args "$@"
	require_name_arg

	# sanity checks
	require_clean_working_tree
	require_branch_absent "$BRANCH"
	git_do fetch -q "$ORIGIN"
	require_branch "$ORIGIN/$BRANCH"

	# create tracking branch
	git_do checkout -b "$BRANCH" "$ORIGIN/$BRANCH"

	echo
	echo "Summary of actions:"
	echo "- A new remote tracking branch '$BRANCH' was created"
	echo "- You are now on branch '$BRANCH'"
	echo
}

cmd_diff() {
	parse_args "$@"

	if [ "$NAME" != "" ]; then
		expand_nameprefix_arg
		BASE=$(git merge-base "$MASTER_BRANCH" "$BRANCH")
		git diff "$BASE..$BRANCH"
	else
		if ! git_current_branch | grep -q "^$PREFIX"; then
			die "Not on a feature branch. Name one explicitly."
		fi

		BASE=$(git merge-base "$MASTER_BRANCH" HEAD)
		git diff "$BASE"
	fi
}

cmd_checkout() {
	parse_args "$@"

	if [ "$NAME" != "" ]; then
		expand_nameprefix_arg
		git_do checkout "$BRANCH"
	else
		die "Name a feature branch explicitly."
	fi
}

cmd_co() {
	# Alias for checkout
	cmd_checkout "$@"
}

cmd_rebase() {
	DEFINE_boolean interactive false 'do an interactive rebase' i
	parse_args "$@"
	expand_nameprefix_arg_or_current
	warn "Will try to rebase '$NAME'..."
	require_clean_working_tree
	require_branch "$BRANCH"

	git_do checkout -q "$BRANCH"
	local OPTS=
	if flag interactive; then
		OPTS="$OPTS -i"
	fi
	git_do rebase $OPTS "$MASTER_BRANCH"
}

avoid_accidental_cross_branch_action() {
	local current_branch=$(git_current_branch)
	if [ "$BRANCH" != "$current_branch" ]; then
		warn "Trying to pull from '$BRANCH' while currently on branch '$current_branch'."
		warn "To avoid unintended merges, git-flow aborted."
		return 1
	fi
	return 0
}

cmd_pull() {
	#DEFINE_string prefix false 'alternative remote feature branch name prefix' p
	DEFINE_boolean rebase false "pull with rebase" r
	parse_remote_name "$@"

	if [ -z "$REMOTE" ]; then
		die "Name a remote explicitly."
	fi
	name_or_current

	# To avoid accidentally merging different feature branches into each other,
	# die if the current feature branch differs from the requested $NAME
	# argument.
	local current_branch=$(git_current_branch)
	if startswith "$current_branch" "$PREFIX"; then
		# we are on a local feature branch already, so $BRANCH must be equal to
		# the current branch
		avoid_accidental_cross_branch_action || die
	fi

	require_clean_working_tree

	if git_branch_exists "$BRANCH"; then
		# Again, avoid accidental merges
		avoid_accidental_cross_branch_action || die

		# we already have a local branch called like this, so simply pull the
		# remote changes in
		if flag rebase; then
			if ! git_do pull --rebase -q "$REMOTE" "$BRANCH"; then
				warn "Pull was aborted. There might be conflicts during rebase or '$REMOTE' might be inaccessible."
				exit 1
			fi
		else
			git_do pull -q "$REMOTE" "$BRANCH" || die "Failed to pull from remote '$REMOTE'."
		fi

		echo "Pulled $REMOTE's changes into $BRANCH."
	else
		# setup the local branch clone for the first time
		git_do fetch -q "$REMOTE" "$BRANCH" || die "Fetch failed."     # stores in FETCH_HEAD
		git_do branch --no-track "$BRANCH" FETCH_HEAD || die "Branch failed."
		git_do checkout -q "$BRANCH" || die "Checking out new local branch failed."
		echo "Created local branch $BRANCH based on $REMOTE's $BRANCH."
	fi
}