#!zsh
#
# Installation
# ------------
#
# To achieve git-flow completion nirvana:
#
#  0. Update your zsh's git-completion module to the newest verion.
#     From here. http://zsh.git.sourceforge.net/git/gitweb.cgi?p=zsh/zsh;a=blob_plain;f=Completion/Unix/Command/_git;hb=HEAD
#
#  1. Install this file. Either:
#
#     a. Place it in your .zshrc:
#
#     b. Or, copy it somewhere (e.g. ~/.git-flow-completion.zsh) and put the following line in
#        your .zshrc:
#
#            source ~/.git-flow-completion.zsh
#
#     c. Or, use this file as a oh-my-zsh plugin.
#

_git-flow ()
{
	local curcontext="$curcontext" state line
	typeset -A opt_args

	_arguments -C \
		':command:->command' \
		'*::options:->options'

	case $state in
		(command)

			local -a subcommands
			subcommands=(
				'init:Initialize a new git repo with support for the branching model.'
				'feature:Manage your feature branches.'
				'release:Manage your release branches.'
				'hotfix:Manage your hotfix branches.'
				'support:Manage your support branches.'
				'version:Shows version information.'
			)
			_describe -t commands 'git flow' subcommands
		;;

		(options)
			case $line[1] in

				(init)
					_arguments \
						-f'[Force setting of gitflow branches, even if already configured]'
					;;

					(version)
					;;

					(hotfix)
						__git-flow-hotfix
					;;

					(release)
						__git-flow-release
					;;

					(feature)
						__git-flow-feature
					;;
			esac
		;;
	esac
}

__git-flow-release ()
{
	local curcontext="$curcontext" state line
	typeset -A opt_args

	_arguments -C \
		':command:->command' \
		'*::options:->options'

	case $state in
		(command)

			local -a subcommands
			subcommands=(
				'start:Start a new release branch.'
				'finish:Finish a release branch.'
				'list:List all your release branches. (Alias to `git flow release`)'
				'publish: public'
				'track: track'
			)
			_describe -t commands 'git flow release' subcommands
			_arguments \
				-v'[Verbose (more) output]'
		;;

		(options)
			case $line[1] in

				(start)
					_arguments \
						-F'[Fetch from origin before performing finish]'\
						':version:__git_flow_version_list'
				;;

				(finish)
					_arguments \
						-F'[Fetch from origin before performing finish]' \
						-s'[Sign the release tag cryptographically]'\
						-u'[Use the given GPG-key for the digital signature (implies -s)]'\
						-m'[Use the given tag message]'\
						-p'[Push to $ORIGIN after performing finish]'\
						':version:__git_flow_version_list'
				;;

				(publish)
					_arguments \
						':version:__git_flow_version_list'\
				;;

				(track)
					_arguments \
						':version:__git_flow_version_list'\
				;;

				*)
					_arguments \
						-v'[Verbose (more) output]'
				;;
			esac
		;;
	esac
}

__git-flow-hotfix ()
{
	local curcontext="$curcontext" state line
	typeset -A opt_args

	_arguments -C \
		':command:->command' \
		'*::options:->options'

	case $state in
		(command)

			local -a subcommands
			subcommands=(
				'start:Start a new hotfix branch.'
				'finish:Finish a hotfix branch.'
				'list:List all your hotfix branches. (Alias to `git flow hotfix`)'
			)
			_describe -t commands 'git flow hotfix' subcommands
			_arguments \
				-v'[Verbose (more) output]'
		;;

		(options)
			case $line[1] in

				(start)
					_arguments \
						-F'[Fetch from origin before performing finish]'\
						':hotfix:__git_flow_version_list'\
						':branch-name:__git_branch_names'
				;;

				(finish)
					_arguments \
						-F'[Fetch from origin before performing finish]' \
						-s'[Sign the release tag cryptographically]'\
						-u'[Use the given GPG-key for the digital signature (implies -s)]'\
						-m'[Use the given tag message]'\
						-p'[Push to $ORIGIN after performing finish]'\
						':hotfix:__git_flow_hotfix_list'
				;;

				*)
					_arguments \
						-v'[Verbose (more) output]'
				;;
			esac
		;;
	esac
}

__git-flow-feature ()
{
	local curcontext="$curcontext" state line
	typeset -A opt_args

	_arguments -C \
		':command:->command' \
		'*::options:->options'

	case $state in
		(command)

			local -a subcommands
			subcommands=(
				'start:Start a new feature branch.'
				'finish:Finish a feature branch.'
				'list:List all your feature branches. (Alias to `git flow feature`)'
				'publish: public'
				'track: track'
				'diff: diff'
				'rebase: rebase'
				'checkout: checkout'
				'pull: pull'
			)
			_describe -t commands 'git flow feature' subcommands
			_arguments \
				-v'[Verbose (more) output]'
		;;

		(options)
			case $line[1] in

				(start)
					_arguments \
						-F'[Fetch from origin before performing finish]'\
						':feature:__git_flow_feature_list'\
						':branch-name:__git_branch_names'
				;;

				(finish)
					_arguments \
						-F'[Fetch from origin before performing finish]' \
						-r'[Rebase instead of merge]'\
						':feature:__git_flow_feature_list'
				;;

				(publish)
					_arguments \
						':feature:__git_flow_feature_list'\
				;;

				(track)
					_arguments \
						':feature:__git_flow_feature_list'\
				;;

				(diff)
					_arguments \
						':branch:__git_branch_names'\
				;;

				(rebase)
					_arguments \
						-i'[Do an interactive rebase]' \
						':branch:__git_branch_names'
				;;

				(checkout)
					_arguments \
						':branch:__git_flow_feature_list'\
				;;

				(pull)
					_arguments \
						':remote:__git_remotes'\
						':branch:__git_branch_names'
				;;

				*)
					_arguments \
						-v'[Verbose (more) output]'
				;;
			esac
		;;
	esac
}

__git_flow_version_list ()
{
	local expl
	declare -a versions

	versions=(${${(f)"$(_call_program versions git flow release list 2> /dev/null | tr -d ' |*')"}})
	__git_command_successful || return

	_wanted versions expl 'version' compadd $versions
}

__git_flow_feature_list ()
{
	local expl
	declare -a features

	features=(${${(f)"$(_call_program features git flow feature list 2> /dev/null | tr -d ' |*')"}})
	__git_command_successful || return

	_wanted features expl 'feature' compadd $features
}

__git_remotes () {
	local expl gitdir remotes

	gitdir=$(_call_program gitdir git rev-parse --git-dir 2>/dev/null)
	__git_command_successful || return

	remotes=(${${(f)"$(_call_program remotes git config --get-regexp '"^remote\..*\.url$"')"}//#(#b)remote.(*).url */$match[1]})
	__git_command_successful || return

	# TODO: Should combine the two instead of either or.
	if (( $#remotes > 0 )); then
		_wanted remotes expl remote compadd $* - $remotes
	else
		_wanted remotes expl remote _files $* - -W "($gitdir/remotes)" -g "$gitdir/remotes/*"
	fi
}

__git_flow_hotfix_list ()
{
	local expl
	declare -a hotfixes

	hotfixes=(${${(f)"$(_call_program hotfixes git flow hotfix list 2> /dev/null | tr -d ' |*')"}})
	__git_command_successful || return

	_wanted hotfixes expl 'hotfix' compadd $hotfixes
}

__git_branch_names () {
	local expl
	declare -a branch_names

	branch_names=(${${(f)"$(_call_program branchrefs git for-each-ref --format='"%(refname)"' refs/heads 2>/dev/null)"}#refs/heads/})
	__git_command_successful || return

	_wanted branch-names expl branch-name compadd $* - $branch_names
}

__git_command_successful () {
	if (( ${#pipestatus:#0} > 0 )); then
		_message 'not a git repository'
		return 1
	fi
	return 0
}

zstyle ':completion:*:*:git:*' user-commands flow:'description for foo'