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## vim:ft=zsh
## git support by: Frank Terbeck <ft@bewatermyfriend.org>
## Distributed under the same BSD-ish license as zsh itself.

setopt localoptions extendedglob NO_shwordsplit
local gitdir gitbase gitbranch gitaction gitunstaged gitstaged gitsha1
local stgitpatch stgitunapplied
local -xA hook_com

VCS_INFO_git_getaction () {
    local gitaction='' gitdir=$1
    local tmp

    for tmp in "${gitdir}/rebase-apply" \
               "${gitdir}/rebase"       \
               "${gitdir}/../.dotest" ; do
        if [[ -d ${tmp} ]] ; then
            if   [[ -f "${tmp}/rebasing" ]] ; then
                gitaction="rebase"
            elif [[ -f "${tmp}/applying" ]] ; then
                gitaction="am"
            else
                gitaction="am/rebase"
            fi
            printf '%s' ${gitaction}
            return 0
        fi
    done

    for tmp in "${gitdir}/rebase-merge/interactive" \
               "${gitdir}/.dotest-merge/interactive" ; do
        if [[ -f "${tmp}" ]] ; then
            printf '%s' "rebase-i"
            return 0
        fi
    done

    for tmp in "${gitdir}/rebase-merge" \
               "${gitdir}/.dotest-merge" ; do
        if [[ -d "${tmp}" ]] ; then
            printf '%s' "rebase-m"
            return 0
        fi
    done

    if [[ -f "${gitdir}/MERGE_HEAD" ]] ; then
        printf '%s' "merge"
        return 0
    fi

    if [[ -f "${gitdir}/BISECT_LOG" ]] ; then
        printf '%s' "bisect"
        return 0
    fi
    return 1
}

VCS_INFO_git_getbranch () {
    local gitbranch gitdir=$1 tmp actiondir
    local gitsymref="${vcs_comm[cmd]} symbolic-ref HEAD"

    actiondir=''
    for tmp in "${gitdir}/rebase-apply" \
               "${gitdir}/rebase"       \
               "${gitdir}/../.dotest"; do
        if [[ -d ${tmp} ]]; then
            actiondir=${tmp}
            break
        fi
    done
    if [[ -n ${actiondir} ]]; then
        gitbranch="$(${(z)gitsymref} 2> /dev/null)"
        [[ -z ${gitbranch} ]] && [[ -r ${actiondir}/head-name ]] \
            && gitbranch="$(< ${actiondir}/head-name)"

    elif [[ -f "${gitdir}/MERGE_HEAD" ]] ; then
        gitbranch="$(${(z)gitsymref} 2> /dev/null)"
        [[ -z ${gitbranch} ]] && gitbranch="$(< ${gitdir}/MERGE_HEAD)"

    elif [[ -d "${gitdir}/rebase-merge" ]] ; then
        gitbranch="$(< ${gitdir}/rebase-merge/head-name)"

    elif [[ -d "${gitdir}/.dotest-merge" ]] ; then
        gitbranch="$(< ${gitdir}/.dotest-merge/head-name)"

    else
        gitbranch="$(${(z)gitsymref} 2> /dev/null)"

        if [[ $? -ne 0 ]] ; then
            gitbranch="refs/tags/$(${vcs_comm[cmd]} describe --exact-match HEAD 2>/dev/null)"

            if [[ $? -ne 0 ]] ; then
                gitbranch="${${"$(< $gitdir/HEAD)"}[1,7]}..."
            fi
        fi
    fi

    printf '%s' "${gitbranch}"
    return 0
}

gitdir=${vcs_comm[gitdir]}
gitbranch="$(VCS_INFO_git_getbranch ${gitdir})"
if zstyle -t ":vcs_info:${vcs}:${usercontext}:${rrn}" get-revision ; then
    gitsha1=$(${vcs_comm[cmd]} rev-parse --quiet --verify HEAD)
else
    gitsha1=''
fi
gitbranch="${gitbranch##refs/[^/]##/}"

if [[ -z ${gitdir} ]] || [[ -z ${gitbranch} ]] ; then
    return 1
fi

if zstyle -t ":vcs_info:${vcs}:${usercontext}:${rrn}" "check-for-changes" && \
   [[ "$(${vcs_comm[cmd]} rev-parse --is-inside-git-dir 2> /dev/null)" != 'true' ]] && \
   ${vcs_comm[cmd]} rev-parse --quiet --verify HEAD &> /dev/null ; then
    # Default: off - these are potentially expensive on big repositories
    ${vcs_comm[cmd]} diff --no-ext-diff --ignore-submodules --quiet --exit-code ||
        gitunstaged=1
    ${vcs_comm[cmd]} diff-index --cached --quiet --ignore-submodules HEAD 2> /dev/null
    (( $? && $? != 128 )) && gitstaged=1
fi

VCS_INFO_adjust
gitaction="$(VCS_INFO_git_getaction ${gitdir})"
gitbase=${PWD%/${$( ${vcs_comm[cmd]} rev-parse --show-prefix )%/##}}
rrn=${gitbase:t}

local patchdir=${gitdir}/patches/${gitbranch}
if [[ -d $patchdir ]] ; then
    local -a stgit_applied stgit_unapplied

    stgit_applied=(${(f)"$(< "${patchdir}/applied")"})
    stgit_applied=( ${(Oa)stgit_applied} )
    stgit_unapplied=(${(f)"$(< "${patchdir}/unapplied")"})
    stgit_unapplied=( ${(oa)stgit_applied} )

    if VCS_INFO_hook 'gen-applied-string' "${stgit_applied[@]}"; then
        if (( ${#stgit_applied} )); then
            stgitpatch=${stgit_applied[1]}
        else
            stgitpatch=""
        fi
    else
        stgitpatch=${hook_com[patch-string]}
    fi
    hook_com=()
    if VCS_INFO_hook 'gen-unapplied-string' "${stgit_unapplied[@]}"; then
        stgitunapplied=${#stgit_unapplied}
    else
        stgitunapplied=${hook_com[unapplied-string]}
    fi

    if (( ${#stgit_applied} )); then
        zstyle -s ":vcs_info:${vcs}:${usercontext}:${rrn}" patch-format stgitmsg || stgitmsg="%p (%n applied)"
    else
        zstyle -s ":vcs_info:${vcs}:${usercontext}:${rrn}" nopatch-format stgitmsg || stgitmsg="no patch applied"
    fi
    hook_com=( applied "${stgitpatch}"     unapplied "${stgitunapplied}"
               applied-n ${#stgit_applied} unapplied-n ${#stgit_unapplied} )
    if VCS_INFO_hook 'set-patch-format' "${stgitmsg}"; then
        zformat -f stgitmsg "${stgitmsg}" "p:${hook_com[applied]}" "u:${hook_com[unapplied]}" \
                                          "n:${#stgit_applied}" "c:${#stgit_unapplied}"
    else
        stgitmsg=${hook_com[patch-replace]}
    fi
    hook_com=()
else
    stgitmsg=''
fi

backend_misc[patches]="${stgitmsg}"
VCS_INFO_formats "${gitaction}" "${gitbranch}" "${gitbase}" "${gitstaged}" "${gitunstaged}" "${gitsha1}" "${stgitmsg}"
return 0

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