Andrew's git - gitweb.git/blob - contrib/completion/git-prompt.sh

   1# bash/zsh git prompt support
   2#
   3# Copyright (C) 2006,2007 Shawn O. Pearce <spearce@spearce.org>
   4# Distributed under the GNU General Public License, version 2.0.
   5#
   6# This script allows you to see the current branch in your prompt.
   7#
   8# To enable:
   9#
  10#    1) Copy this file to somewhere (e.g. ~/.git-prompt.sh).
  11#    2) Add the following line to your .bashrc/.zshrc:
  12#        source ~/.git-prompt.sh
  13#    3) Change your PS1 to also show the current branch:
  14#         Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
  15#         ZSH:  PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
  16#
  17# The argument to __git_ps1 will be displayed only if you are currently
  18# in a git repository.  The %s token will be the name of the current
  19# branch.
  20#
  21# In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
  22# unstaged (*) and staged (+) changes will be shown next to the branch
  23# name.  You can configure this per-repository with the
  24# bash.showDirtyState variable, which defaults to true once
  25# GIT_PS1_SHOWDIRTYSTATE is enabled.
  26#
  27# You can also see if currently something is stashed, by setting
  28# GIT_PS1_SHOWSTASHSTATE to a nonempty value. If something is stashed,
  29# then a '$' will be shown next to the branch name.
  30#
  31# If you would like to see if there're untracked files, then you can set
  32# GIT_PS1_SHOWUNTRACKEDFILES to a nonempty value. If there're untracked
  33# files, then a '%' will be shown next to the branch name.
  34#
  35# If you would like to see the difference between HEAD and its upstream,
  36# set GIT_PS1_SHOWUPSTREAM="auto".  A "<" indicates you are behind, ">"
  37# indicates you are ahead, "<>" indicates you have diverged and "="
  38# indicates that there is no difference. You can further control
  39# behaviour by setting GIT_PS1_SHOWUPSTREAM to a space-separated list
  40# of values:
  41#
  42#     verbose       show number of commits ahead/behind (+/-) upstream
  43#     legacy        don't use the '--count' option available in recent
  44#                   versions of git-rev-list
  45#     git           always compare HEAD to @{upstream}
  46#     svn           always compare HEAD to your SVN upstream
  47#
  48# By default, __git_ps1 will compare HEAD to your SVN upstream if it can
  49# find one, or @{upstream} otherwise.  Once you have set
  50# GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
  51# setting the bash.showUpstream config variable.
  52#
  53# If you would like to see more information about the identity of
  54# commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
  55# to one of these values:
  56#
  57#     contains      relative to newer annotated tag (v1.6.3.2~35)
  58#     branch        relative to newer tag or branch (master~4)
  59#     describe      relative to older annotated tag (v1.6.3.1-13-gdd42c2f)
  60#     default       exactly matching tag
  61
  62# __gitdir accepts 0 or 1 arguments (i.e., location)
  63# returns location of .git repo
  64__gitdir ()
  65{
  66        # Note: this function is duplicated in git-completion.bash
  67        # When updating it, make sure you update the other one to match.
  68        if [ -z "${1-}" ]; then
  69                if [ -n "${__git_dir-}" ]; then
  70                        echo "$__git_dir"
  71                elif [ -n "${GIT_DIR-}" ]; then
  72                        test -d "${GIT_DIR-}" || return 1
  73                        echo "$GIT_DIR"
  74                elif [ -d .git ]; then
  75                        echo .git
  76                else
  77                        git rev-parse --git-dir 2>/dev/null
  78                fi
  79        elif [ -d "$1/.git" ]; then
  80                echo "$1/.git"
  81        else
  82                echo "$1"
  83        fi
  84}
  85
  86# stores the divergence from upstream in $p
  87# used by GIT_PS1_SHOWUPSTREAM
  88__git_ps1_show_upstream ()
  89{
  90        local key value
  91        local svn_remote svn_url_pattern count n
  92        local upstream=git legacy="" verbose=""
  93
  94        svn_remote=()
  95        # get some config options from git-config
  96        local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
  97        while read -r key value; do
  98                case "$key" in
  99                bash.showupstream)
 100                        GIT_PS1_SHOWUPSTREAM="$value"
 101                        if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
 102                                p=""
 103                                return
 104                        fi
 105                        ;;
 106                svn-remote.*.url)
 107                        svn_remote[ $((${#svn_remote[@]} + 1)) ]="$value"
 108                        svn_url_pattern+="\\|$value"
 109                        upstream=svn+git # default upstream is SVN if available, else git
 110                        ;;
 111                esac
 112        done <<< "$output"
 113
 114        # parse configuration values
 115        for option in ${GIT_PS1_SHOWUPSTREAM}; do
 116                case "$option" in
 117                git|svn) upstream="$option" ;;
 118                verbose) verbose=1 ;;
 119                legacy)  legacy=1  ;;
 120                esac
 121        done
 122
 123        # Find our upstream
 124        case "$upstream" in
 125        git)    upstream="@{upstream}" ;;
 126        svn*)
 127                # get the upstream from the "git-svn-id: ..." in a commit message
 128                # (git-svn uses essentially the same procedure internally)
 129                local svn_upstream=($(git log --first-parent -1 \
 130                                        --grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
 131                if [[ 0 -ne ${#svn_upstream[@]} ]]; then
 132                        svn_upstream=${svn_upstream[ ${#svn_upstream[@]} - 2 ]}
 133                        svn_upstream=${svn_upstream%@*}
 134                        local n_stop="${#svn_remote[@]}"
 135                        for ((n=1; n <= n_stop; n++)); do
 136                                svn_upstream=${svn_upstream#${svn_remote[$n]}}
 137                        done
 138
 139                        if [[ -z "$svn_upstream" ]]; then
 140                                # default branch name for checkouts with no layout:
 141                                upstream=${GIT_SVN_ID:-git-svn}
 142                        else
 143                                upstream=${svn_upstream#/}
 144                        fi
 145                elif [[ "svn+git" = "$upstream" ]]; then
 146                        upstream="@{upstream}"
 147                fi
 148                ;;
 149        esac
 150
 151        # Find how many commits we are ahead/behind our upstream
 152        if [[ -z "$legacy" ]]; then
 153                count="$(git rev-list --count --left-right \
 154                                "$upstream"...HEAD 2>/dev/null)"
 155        else
 156                # produce equivalent output to --count for older versions of git
 157                local commits
 158                if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
 159                then
 160                        local commit behind=0 ahead=0
 161                        for commit in $commits
 162                        do
 163                                case "$commit" in
 164                                "<"*) ((behind++)) ;;
 165                                *)    ((ahead++))  ;;
 166                                esac
 167                        done
 168                        count="$behind  $ahead"
 169                else
 170                        count=""
 171                fi
 172        fi
 173
 174        # calculate the result
 175        if [[ -z "$verbose" ]]; then
 176                case "$count" in
 177                "") # no upstream
 178                        p="" ;;
 179                "0      0") # equal to upstream
 180                        p="=" ;;
 181                "0      "*) # ahead of upstream
 182                        p=">" ;;
 183                *"      0") # behind upstream
 184                        p="<" ;;
 185                *)          # diverged from upstream
 186                        p="<>" ;;
 187                esac
 188        else
 189                case "$count" in
 190                "") # no upstream
 191                        p="" ;;
 192                "0      0") # equal to upstream
 193                        p=" u=" ;;
 194                "0      "*) # ahead of upstream
 195                        p=" u+${count#0 }" ;;
 196                *"      0") # behind upstream
 197                        p=" u-${count%  0}" ;;
 198                *)          # diverged from upstream
 199                        p=" u+${count#* }-${count%      *}" ;;
 200                esac
 201        fi
 202
 203}
 204
 205
 206# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
 207# returns text to add to bash PS1 prompt (includes branch name)
 208__git_ps1 ()
 209{
 210        local g="$(__gitdir)"
 211        if [ -n "$g" ]; then
 212                local r=""
 213                local b=""
 214                if [ -f "$g/rebase-merge/interactive" ]; then
 215                        r="|REBASE-i"
 216                        b="$(cat "$g/rebase-merge/head-name")"
 217                elif [ -d "$g/rebase-merge" ]; then
 218                        r="|REBASE-m"
 219                        b="$(cat "$g/rebase-merge/head-name")"
 220                else
 221                        if [ -d "$g/rebase-apply" ]; then
 222                                if [ -f "$g/rebase-apply/rebasing" ]; then
 223                                        r="|REBASE"
 224                                elif [ -f "$g/rebase-apply/applying" ]; then
 225                                        r="|AM"
 226                                else
 227                                        r="|AM/REBASE"
 228                                fi
 229                        elif [ -f "$g/MERGE_HEAD" ]; then
 230                                r="|MERGING"
 231                        elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
 232                                r="|CHERRY-PICKING"
 233                        elif [ -f "$g/BISECT_LOG" ]; then
 234                                r="|BISECTING"
 235                        fi
 236
 237                        b="$(git symbolic-ref HEAD 2>/dev/null)" || {
 238
 239                                b="$(
 240                                case "${GIT_PS1_DESCRIBE_STYLE-}" in
 241                                (contains)
 242                                        git describe --contains HEAD ;;
 243                                (branch)
 244                                        git describe --contains --all HEAD ;;
 245                                (describe)
 246                                        git describe HEAD ;;
 247                                (* | default)
 248                                        git describe --tags --exact-match HEAD ;;
 249                                esac 2>/dev/null)" ||
 250
 251                                b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
 252                                b="unknown"
 253                                b="($b)"
 254                        }
 255                fi
 256
 257                local w=""
 258                local i=""
 259                local s=""
 260                local u=""
 261                local c=""
 262                local p=""
 263
 264                if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
 265                        if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
 266                                c="BARE:"
 267                        else
 268                                b="GIT_DIR!"
 269                        fi
 270                elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
 271                        if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ]; then
 272                                if [ "$(git config --bool bash.showDirtyState)" != "false" ]; then
 273                                        git diff --no-ext-diff --quiet --exit-code || w="*"
 274                                        if git rev-parse --quiet --verify HEAD >/dev/null; then
 275                                                git diff-index --cached --quiet HEAD -- || i="+"
 276                                        else
 277                                                i="#"
 278                                        fi
 279                                fi
 280                        fi
 281                        if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
 282                                git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
 283                        fi
 284
 285                        if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
 286                                if [ -n "$(git ls-files --others --exclude-standard)" ]; then
 287                                        u="%"
 288                                fi
 289                        fi
 290
 291                        if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
 292                                __git_ps1_show_upstream
 293                        fi
 294                fi
 295
 296                local f="$w$i$s$u"
 297                printf -- "${1:- (%s)}" "$c${b##refs/heads/}${f:+ $f}$r$p"
 298        fi
 299}