#compdef git gitk

# zsh completion wrapper for git
#
# Copyright (c) 2012-2013 Felipe Contreras <felipe.contreras@gmail.com>
#
# You need git's bash completion script installed somewhere, by default on the
# same directory as this script.
#
# If your script is on ~/.git-completion.sh instead, you can configure it on
# your ~/.zshrc:
#
#  zstyle ':completion:*:*:git:*' script ~/.git-completion.sh
#
# The recommended way to install this script is to copy to
# '~/.zsh/completion/_git', and then add the following to your ~/.zshrc file:
#
#  fpath=(~/.zsh/completion $fpath)

complete ()
{
        # do nothing
        return 0
}

zstyle -T ':completion:*:*:git:*' tag-order && \
        zstyle ':completion:*:*:git:*' tag-order 'common-commands'

zstyle -s ":completion:*:*:git:*" script script
test -z "$script" && script="$(dirname ${funcsourcetrace[1]%:*})"/git-completion.bash
ZSH_VERSION='' . "$script"

__gitcomp ()
{
        emulate -L zsh

        local cur_="${3-$cur}"

        case "$cur_" in
        --*=)
                ;;
        *)
                local c IFS=$' \t\n'
                local -a array
                for c in ${=1}; do
                        c="$c${4-}"
                        case $c in
                        --*=*|*.) ;;
                        *) c="$c " ;;
                        esac
                        array+=("$c")
                done
                compset -P '*[=:]'
                compadd -Q -S '' -p "${2-}" -a -- array && _ret=0
                ;;
        esac
}

__gitcomp_nl ()
{
        emulate -L zsh

        local IFS=$'\n'
        compset -P '*[=:]'
        compadd -Q -S "${4- }" -p "${2-}" -- ${=1} && _ret=0
}

__gitcomp_file ()
{
        emulate -L zsh

        local IFS=$'\n'
        compset -P '*[=:]'
        compadd -Q -p "${2-}" -f -- ${=1} && _ret=0
}

__git_zsh_bash_func ()
{
        emulate -L ksh

        local command=$1

        local completion_func="_git_${command//-/_}"
        declare -f $completion_func >/dev/null && $completion_func && return

        local expansion=$(__git_aliased_command "$command")
        if [ -n "$expansion" ]; then
                completion_func="_git_${expansion//-/_}"
                declare -f $completion_func >/dev/null && $completion_func
        fi
}

__git_zsh_cmd_common ()
{
        local -a list
        list=(
        add:'add file contents to the index'
        bisect:'find by binary search the change that introduced a bug'
        branch:'list, create, or delete branches'
        checkout:'checkout a branch or paths to the working tree'
        clone:'clone a repository into a new directory'
        commit:'record changes to the repository'
        diff:'show changes between commits, commit and working tree, etc'
        fetch:'download objects and refs from another repository'
        grep:'print lines matching a pattern'
        init:'create an empty Git repository or reinitialize an existing one'
        log:'show commit logs'
        merge:'join two or more development histories together'
        mv:'move or rename a file, a directory, or a symlink'
        pull:'fetch from and merge with another repository or a local branch'
        push:'update remote refs along with associated objects'
        rebase:'forward-port local commits to the updated upstream head'
        reset:'reset current HEAD to the specified state'
        rm:'remove files from the working tree and from the index'
        show:'show various types of objects'
        status:'show the working tree status'
        tag:'create, list, delete or verify a tag object signed with GPG')
        _describe -t common-commands 'common commands' list && _ret=0
}

__git_zsh_cmd_alias ()
{
        local -a list
        list=(${${${(0)"$(git config -z --get-regexp '^alias\.')"}#alias.}%$'\n'*})
        _describe -t alias-commands 'aliases' list $* && _ret=0
}

__git_zsh_cmd_all ()
{
        local -a list
        emulate ksh -c __git_compute_all_commands
        list=( ${=__git_all_commands} )
        _describe -t all-commands 'all commands' list && _ret=0
}

__git_zsh_main ()
{
        local curcontext="$curcontext" state state_descr line
        typeset -A opt_args
        local -a orig_words

        orig_words=( ${words[@]} )

        _arguments -C \
                '(-p --paginate --no-pager)'{-p,--paginate}'[pipe all output into ''less'']' \
                '(-p --paginate)--no-pager[do not pipe git output into a pager]' \
                '--git-dir=-[set the path to the repository]: :_directories' \
                '--bare[treat the repository as a bare repository]' \
                '(- :)--version[prints the git suite version]' \
                '--exec-path=-[path to where your core git programs are installed]:: :_directories' \
                '--html-path[print the path where git''s HTML documentation is installed]' \
                '--info-path[print the path where the Info files are installed]' \
                '--man-path[print the manpath (see `man(1)`) for the man pages]' \
                '--work-tree=-[set the path to the working tree]: :_directories' \
                '--namespace=-[set the git namespace]' \
                '--no-replace-objects[do not use replacement refs to replace git objects]' \
                '(- :)--help[prints the synopsis and a list of the most commonly used commands]: :->arg' \
                '(-): :->command' \
                '(-)*:: :->arg' && return

        case $state in
        (command)
                _alternative \
                         'alias-commands:alias:__git_zsh_cmd_alias' \
                         'common-commands:common:__git_zsh_cmd_common' \
                         'all-commands:all:__git_zsh_cmd_all' && _ret=0
                ;;
        (arg)
                local command="${words[1]}" __git_dir

                if (( $+opt_args[--bare] )); then
                        __git_dir='.'
                else
                        __git_dir=${opt_args[--git-dir]}
                fi

                (( $+opt_args[--help] )) && command='help'

                words=( ${orig_words[@]} )

                __git_zsh_bash_func $command
                ;;
        esac
}

_git ()
{
        local _ret=1
        local cur cword prev

        cur=${words[CURRENT]}
        prev=${words[CURRENT-1]}
        let cword=CURRENT-1

        if (( $+functions[__${service}_zsh_main] )); then
                __${service}_zsh_main
        else
                emulate ksh -c __${service}_main
        fi

        let _ret && _default -S '' && _ret=0
        return _ret
}

_git