.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 repository status 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 #    3a) Change your PS1 to call __git_ps1 as
  14 #        command-substitution:
  15 #        Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
  16 #        ZSH:  setopt PROMPT_SUBST ; PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
  17 #        the optional argument will be used as format string.
  18 #    3b) Alternatively, for a slightly faster prompt, __git_ps1 can
  19 #        be used for PROMPT_COMMAND in Bash or for precmd() in Zsh
  20 #        with two parameters, <pre> and <post>, which are strings
  21 #        you would put in $PS1 before and after the status string
  22 #        generated by the git-prompt machinery.  e.g.
  23 #        Bash: PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
  24 #          will show username, at-sign, host, colon, cwd, then
  25 #          various status string, followed by dollar and SP, as
  26 #          your prompt.
  27 #        ZSH:  precmd () { __git_ps1 "%n" ":%~$ " "|%s" }
  28 #          will show username, pipe, then various status string,
  29 #          followed by colon, cwd, dollar and SP, as your prompt.
  30 #        Optionally, you can supply a third argument with a printf
  31 #        format string to finetune the output of the branch status
  32 #
  33 # The repository status will be displayed only if you are currently in a
  34 # git repository. The %s token is the placeholder for the shown status.
  35 #
  36 # The prompt status always includes the current branch name.
  37 #
  38 # In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
  39 # unstaged (*) and staged (+) changes will be shown next to the branch
  40 # name.  You can configure this per-repository with the
  41 # bash.showDirtyState variable, which defaults to true once
  42 # GIT_PS1_SHOWDIRTYSTATE is enabled.
  43 #
  44 # You can also see if currently something is stashed, by setting
  45 # GIT_PS1_SHOWSTASHSTATE to a nonempty value. If something is stashed,
  46 # then a '$' will be shown next to the branch name.
  47 #
  48 # If you would like to see if there're untracked files, then you can set
  49 # GIT_PS1_SHOWUNTRACKEDFILES to a nonempty value. If there're untracked
  50 # files, then a '%' will be shown next to the branch name.  You can
  51 # configure this per-repository with the bash.showUntrackedFiles
  52 # variable, which defaults to true once GIT_PS1_SHOWUNTRACKEDFILES is
  53 # enabled.
  54 #
  55 # If you would like to see the difference between HEAD and its upstream,
  56 # set GIT_PS1_SHOWUPSTREAM="auto".  A "<" indicates you are behind, ">"
  57 # indicates you are ahead, "<>" indicates you have diverged and "="
  58 # indicates that there is no difference. You can further control
  59 # behaviour by setting GIT_PS1_SHOWUPSTREAM to a space-separated list
  60 # of values:
  61 #
  62 #     verbose       show number of commits ahead/behind (+/-) upstream
  63 #     name          if verbose, then also show the upstream abbrev name
  64 #     legacy        don't use the '--count' option available in recent
  65 #                   versions of git-rev-list
  66 #     git           always compare HEAD to @{upstream}
  67 #     svn           always compare HEAD to your SVN upstream
  68 #
  69 # You can change the separator between the branch name and the above
  70 # state symbols by setting GIT_PS1_STATESEPARATOR. The default separator
  71 # is SP.
  72 #
  73 # By default, __git_ps1 will compare HEAD to your SVN upstream if it can
  74 # find one, or @{upstream} otherwise.  Once you have set
  75 # GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
  76 # setting the bash.showUpstream config variable.
  77 #
  78 # If you would like to see more information about the identity of
  79 # commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
  80 # to one of these values:
  81 #
  82 #     contains      relative to newer annotated tag (v1.6.3.2~35)
  83 #     branch        relative to newer tag or branch (master~4)
  84 #     describe      relative to older annotated tag (v1.6.3.1-13-gdd42c2f)
  85 #     tag           relative to any older tag (v1.6.3.1-13-gdd42c2f)
  86 #     default       exactly matching tag
  87 #
  88 # If you would like a colored hint about the current dirty state, set
  89 # GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
  90 # the colored output of "git status -sb" and are available only when
  91 # using __git_ps1 for PROMPT_COMMAND or precmd.
  92 #
  93 # If you would like __git_ps1 to do nothing in the case when the current
  94 # directory is set up to be ignored by git, then set
  95 # GIT_PS1_HIDE_IF_PWD_IGNORED to a nonempty value. Override this on the
  96 # repository level by setting bash.hideIfPwdIgnored to "false".
  97
  98 # check whether printf supports -v
  99 __git_printf_supports_v=
 100 printf -v __git_printf_supports_v -- '%s' yes >/dev/null 2>&1
 101
 102 # stores the divergence from upstream in $p
 103 # used by GIT_PS1_SHOWUPSTREAM
 104 __git_ps1_show_upstream ()
 105 {
 106         local key value
 107         local svn_remote svn_url_pattern count n
 108         local upstream=git legacy="" verbose="" name=""
 109
 110         svn_remote=()
 111         # get some config options from git-config
 112         local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
 113         while read -r key value; do
 114                 case "$key" in
 115                 bash.showupstream)
 116                         GIT_PS1_SHOWUPSTREAM="$value"
 117                         if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
 118                                 p=""
 119                                 return
 120                         fi
 121                         ;;
 122                 svn-remote.*.url)
 123                         svn_remote[$((${#svn_remote[@]} + 1))]="$value"
 124                         svn_url_pattern="$svn_url_pattern\\|$value"
 125                         upstream=svn+git # default upstream is SVN if available, else git
 126                         ;;
 127                 esac
 128         done <<< "$output"
 129
 130         # parse configuration values
 131         for option in ${GIT_PS1_SHOWUPSTREAM}; do
 132                 case "$option" in
 133                 git|svn) upstream="$option" ;;
 134                 verbose) verbose=1 ;;
 135                 legacy)  legacy=1  ;;
 136                 name)    name=1 ;;
 137                 esac
 138         done
 139
 140         # Find our upstream
 141         case "$upstream" in
 142         git)    upstream="@{upstream}" ;;
 143         svn*)
 144                 # get the upstream from the "git-svn-id: ..." in a commit message
 145                 # (git-svn uses essentially the same procedure internally)
 146                 local -a svn_upstream
 147                 svn_upstream=($(git log --first-parent -1 \
 148                                         --grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
 149                 if [[ 0 -ne ${#svn_upstream[@]} ]]; then
 150                         svn_upstream=${svn_upstream[${#svn_upstream[@]} - 2]}
 151                         svn_upstream=${svn_upstream%@*}
 152                         local n_stop="${#svn_remote[@]}"
 153                         for ((n=1; n <= n_stop; n++)); do
 154                                 svn_upstream=${svn_upstream#${svn_remote[$n]}}
 155                         done
 156
 157                         if [[ -z "$svn_upstream" ]]; then
 158                                 # default branch name for checkouts with no layout:
 159                                 upstream=${GIT_SVN_ID:-git-svn}
 160                         else
 161                                 upstream=${svn_upstream#/}
 162                         fi
 163                 elif [[ "svn+git" = "$upstream" ]]; then
 164                         upstream="@{upstream}"
 165                 fi
 166                 ;;
 167         esac
 168
 169         # Find how many commits we are ahead/behind our upstream
 170         if [[ -z "$legacy" ]]; then
 171                 count="$(git rev-list --count --left-right \
 172                                 "$upstream"...HEAD 2>/dev/null)"
 173         else
 174                 # produce equivalent output to --count for older versions of git
 175                 local commits
 176                 if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
 177                 then
 178                         local commit behind=0 ahead=0
 179                         for commit in $commits
 180                         do
 181                                 case "$commit" in
 182                                 "<"*) ((behind++)) ;;
 183                                 *)    ((ahead++))  ;;
 184                                 esac
 185                         done
 186                         count="$behind  $ahead"
 187                 else
 188                         count=""
 189                 fi
 190         fi
 191
 192         # calculate the result
 193         if [[ -z "$verbose" ]]; then
 194                 case "$count" in
 195                 "") # no upstream
 196                         p="" ;;
 197                 "0      0") # equal to upstream
 198                         p="=" ;;
 199                 "0      "*) # ahead of upstream
 200                         p=">" ;;
 201                 *"      0") # behind upstream
 202                         p="<" ;;
 203                 *)          # diverged from upstream
 204                         p="<>" ;;
 205                 esac
 206         else
 207                 case "$count" in
 208                 "") # no upstream
 209                         p="" ;;
 210                 "0      0") # equal to upstream
 211                         p=" u=" ;;
 212                 "0      "*) # ahead of upstream
 213                         p=" u+${count#0 }" ;;
 214                 *"      0") # behind upstream
 215                         p=" u-${count%  0}" ;;
 216                 *)          # diverged from upstream
 217                         p=" u+${count#* }-${count%      *}" ;;
 218                 esac
 219                 if [[ -n "$count" && -n "$name" ]]; then
 220                         __git_ps1_upstream_name=$(git rev-parse \
 221                                 --abbrev-ref "$upstream" 2>/dev/null)
 222                         if [ $pcmode = yes ] && [ $ps1_expanded = yes ]; then
 223                                 p="$p \${__git_ps1_upstream_name}"
 224                         else
 225                                 p="$p ${__git_ps1_upstream_name}"
 226                                 # not needed anymore; keep user's
 227                                 # environment clean
 228                                 unset __git_ps1_upstream_name
 229                         fi
 230                 fi
 231         fi
 232
 233 }
 234
 235 # Helper function that is meant to be called from __git_ps1.  It
 236 # injects color codes into the appropriate gitstring variables used
 237 # to build a gitstring.
 238 __git_ps1_colorize_gitstring ()
 239 {
 240         if [[ -n ${ZSH_VERSION-} ]]; then
 241                 local c_red='%F{red}'
 242                 local c_green='%F{green}'
 243                 local c_lblue='%F{blue}'
 244                 local c_clear='%f'
 245         else
 246                 # Using \[ and \] around colors is necessary to prevent
 247                 # issues with command line editing/browsing/completion!
 248                 local c_red='\[\e[31m\]'
 249                 local c_green='\[\e[32m\]'
 250                 local c_lblue='\[\e[1;34m\]'
 251                 local c_clear='\[\e[0m\]'
 252         fi
 253         local bad_color=$c_red
 254         local ok_color=$c_green
 255         local flags_color="$c_lblue"
 256
 257         local branch_color=""
 258         if [ $detached = no ]; then
 259                 branch_color="$ok_color"
 260         else
 261                 branch_color="$bad_color"
 262         fi
 263         c="$branch_color$c"
 264
 265         z="$c_clear$z"
 266         if [ "$w" = "*" ]; then
 267                 w="$bad_color$w"
 268         fi
 269         if [ -n "$i" ]; then
 270                 i="$ok_color$i"
 271         fi
 272         if [ -n "$s" ]; then
 273                 s="$flags_color$s"
 274         fi
 275         if [ -n "$u" ]; then
 276                 u="$bad_color$u"
 277         fi
 278         r="$c_clear$r"
 279 }
 280
 281 # Helper function to read the first line of a file into a variable.
 282 # __git_eread requires 2 arguments, the file path and the name of the
 283 # variable, in that order.
 284 __git_eread ()
 285 {
 286         test -r "$1" && IFS=$'\r\n' read "$2" <"$1"
 287 }
 288
 289 # __git_ps1 accepts 0 or 1 arguments (i.e., format string)
 290 # when called from PS1 using command substitution
 291 # in this mode it prints text to add to bash PS1 prompt (includes branch name)
 292 #
 293 # __git_ps1 requires 2 or 3 arguments when called from PROMPT_COMMAND (pc)
 294 # in that case it _sets_ PS1. The arguments are parts of a PS1 string.
 295 # when two arguments are given, the first is prepended and the second appended
 296 # to the state string when assigned to PS1.
 297 # The optional third parameter will be used as printf format string to further
 298 # customize the output of the git-status string.
 299 # In this mode you can request colored hints using GIT_PS1_SHOWCOLORHINTS=true
 300 __git_ps1 ()
 301 {
 302         # preserve exit status
 303         local exit=$?
 304         local pcmode=no
 305         local detached=no
 306         local ps1pc_start='\u@\h:\w '
 307         local ps1pc_end='\$ '
 308         local printf_format=' (%s)'
 309
 310         case "$#" in
 311                 2|3)    pcmode=yes
 312                         ps1pc_start="$1"
 313                         ps1pc_end="$2"
 314                         printf_format="${3:-$printf_format}"
 315                         # set PS1 to a plain prompt so that we can
 316                         # simply return early if the prompt should not
 317                         # be decorated
 318                         PS1="$ps1pc_start$ps1pc_end"
 319                 ;;
 320                 0|1)    printf_format="${1:-$printf_format}"
 321                 ;;
 322                 *)      return $exit
 323                 ;;
 324         esac
 325
 326         # ps1_expanded:  This variable is set to 'yes' if the shell
 327         # subjects the value of PS1 to parameter expansion:
 328         #
 329         #   * bash does unless the promptvars option is disabled
 330         #   * zsh does not unless the PROMPT_SUBST option is set
 331         #   * POSIX shells always do
 332         #
 333         # If the shell would expand the contents of PS1 when drawing
 334         # the prompt, a raw ref name must not be included in PS1.
 335         # This protects the user from arbitrary code execution via
 336         # specially crafted ref names.  For example, a ref named
 337         # 'refs/heads/$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' might cause the
 338         # shell to execute 'sudo rm -rf /' when the prompt is drawn.
 339         #
 340         # Instead, the ref name should be placed in a separate global
 341         # variable (in the __git_ps1_* namespace to avoid colliding
 342         # with the user's environment) and that variable should be
 343         # referenced from PS1.  For example:
 344         #
 345         #     __git_ps1_foo=$(do_something_to_get_ref_name)
 346         #     PS1="...stuff...\${__git_ps1_foo}...stuff..."
 347         #
 348         # If the shell does not expand the contents of PS1, the raw
 349         # ref name must be included in PS1.
 350         #
 351         # The value of this variable is only relevant when in pcmode.
 352         #
 353         # Assume that the shell follows the POSIX specification and
 354         # expands PS1 unless determined otherwise.  (This is more
 355         # likely to be correct if the user has a non-bash, non-zsh
 356         # shell and safer than the alternative if the assumption is
 357         # incorrect.)
 358         #
 359         local ps1_expanded=yes
 360         [ -z "${ZSH_VERSION-}" ] || [[ -o PROMPT_SUBST ]] || ps1_expanded=no
 361         [ -z "${BASH_VERSION-}" ] || shopt -q promptvars || ps1_expanded=no
 362
 363         local repo_info rev_parse_exit_code
 364         repo_info="$(git rev-parse --git-dir --is-inside-git-dir \
 365                 --is-bare-repository --is-inside-work-tree \
 366                 --short HEAD 2>/dev/null)"
 367         rev_parse_exit_code="$?"
 368
 369         if [ -z "$repo_info" ]; then
 370                 return $exit
 371         fi
 372
 373         local short_sha=""
 374         if [ "$rev_parse_exit_code" = "0" ]; then
 375                 short_sha="${repo_info##*$'\n'}"
 376                 repo_info="${repo_info%$'\n'*}"
 377         fi
 378         local inside_worktree="${repo_info##*$'\n'}"
 379         repo_info="${repo_info%$'\n'*}"
 380         local bare_repo="${repo_info##*$'\n'}"
 381         repo_info="${repo_info%$'\n'*}"
 382         local inside_gitdir="${repo_info##*$'\n'}"
 383         local g="${repo_info%$'\n'*}"
 384
 385         if [ "true" = "$inside_worktree" ] &&
 386            [ -n "${GIT_PS1_HIDE_IF_PWD_IGNORED-}" ] &&
 387            [ "$(git config --bool bash.hideIfPwdIgnored)" != "false" ] &&
 388            git check-ignore -q .
 389         then
 390                 return $exit
 391         fi
 392
 393         local r=""
 394         local b=""
 395         local step=""
 396         local total=""
 397         if [ -d "$g/rebase-merge" ]; then
 398                 __git_eread "$g/rebase-merge/head-name" b
 399                 __git_eread "$g/rebase-merge/msgnum" step
 400                 __git_eread "$g/rebase-merge/end" total
 401                 if [ -f "$g/rebase-merge/interactive" ]; then
 402                         r="|REBASE-i"
 403                 else
 404                         r="|REBASE-m"
 405                 fi
 406         else
 407                 if [ -d "$g/rebase-apply" ]; then
 408                         __git_eread "$g/rebase-apply/next" step
 409                         __git_eread "$g/rebase-apply/last" total
 410                         if [ -f "$g/rebase-apply/rebasing" ]; then
 411                                 __git_eread "$g/rebase-apply/head-name" b
 412                                 r="|REBASE"
 413                         elif [ -f "$g/rebase-apply/applying" ]; then
 414                                 r="|AM"
 415                         else
 416                                 r="|AM/REBASE"
 417                         fi
 418                 elif [ -f "$g/MERGE_HEAD" ]; then
 419                         r="|MERGING"
 420                 elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
 421                         r="|CHERRY-PICKING"
 422                 elif [ -f "$g/REVERT_HEAD" ]; then
 423                         r="|REVERTING"
 424                 elif [ -f "$g/BISECT_LOG" ]; then
 425                         r="|BISECTING"
 426                 fi
 427
 428                 if [ -n "$b" ]; then
 429                         :
 430                 elif [ -h "$g/HEAD" ]; then
 431                         # symlink symbolic ref
 432                         b="$(git symbolic-ref HEAD 2>/dev/null)"
 433                 else
 434                         local head=""
 435                         if ! __git_eread "$g/HEAD" head; then
 436                                 return $exit
 437                         fi
 438                         # is it a symbolic ref?
 439                         b="${head#ref: }"
 440                         if [ "$head" = "$b" ]; then
 441                                 detached=yes
 442                                 b="$(
 443                                 case "${GIT_PS1_DESCRIBE_STYLE-}" in
 444                                 (contains)
 445                                         git describe --contains HEAD ;;
 446                                 (branch)
 447                                         git describe --contains --all HEAD ;;
 448                                 (tag)
 449                                         git describe --tags HEAD ;;
 450                                 (describe)
 451                                         git describe HEAD ;;
 452                                 (* | default)
 453                                         git describe --tags --exact-match HEAD ;;
 454                                 esac 2>/dev/null)" ||
 455
 456                                 b="$short_sha..."
 457                                 b="($b)"
 458                         fi
 459                 fi
 460         fi
 461
 462         if [ -n "$step" ] && [ -n "$total" ]; then
 463                 r="$r $step/$total"
 464         fi
 465
 466         local w=""
 467         local i=""
 468         local s=""
 469         local u=""
 470         local c=""
 471         local p=""
 472
 473         if [ "true" = "$inside_gitdir" ]; then
 474                 if [ "true" = "$bare_repo" ]; then
 475                         c="BARE:"
 476                 else
 477                         b="GIT_DIR!"
 478                 fi
 479         elif [ "true" = "$inside_worktree" ]; then
 480                 if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ] &&
 481                    [ "$(git config --bool bash.showDirtyState)" != "false" ]
 482                 then
 483                         git diff --no-ext-diff --quiet || w="*"
 484                         git diff --no-ext-diff --cached --quiet || i="+"
 485                         if [ -z "$short_sha" ] && [ -z "$i" ]; then
 486                                 i="#"
 487                         fi
 488                 fi
 489                 if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ] &&
 490                    git rev-parse --verify --quiet refs/stash >/dev/null
 491                 then
 492                         s="$"
 493                 fi
 494
 495                 if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
 496                    [ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
 497                    git ls-files --others --exclude-standard --directory --no-empty-directory --error-unmatch -- ':/*' >/dev/null 2>/dev/null
 498                 then
 499                         u="%${ZSH_VERSION+%}"
 500                 fi
 501
 502                 if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
 503                         __git_ps1_show_upstream
 504                 fi
 505         fi
 506
 507         local z="${GIT_PS1_STATESEPARATOR-" "}"
 508
 509         # NO color option unless in PROMPT_COMMAND mode
 510         if [ $pcmode = yes ] && [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
 511                 __git_ps1_colorize_gitstring
 512         fi
 513
 514         b=${b##refs/heads/}
 515         if [ $pcmode = yes ] && [ $ps1_expanded = yes ]; then
 516                 __git_ps1_branch_name=$b
 517                 b="\${__git_ps1_branch_name}"
 518         fi
 519
 520         local f="$w$i$s$u"
 521         local gitstring="$c$b${f:+$z$f}$r$p"
 522
 523         if [ $pcmode = yes ]; then
 524                 if [ "${__git_printf_supports_v-}" != yes ]; then
 525                         gitstring=$(printf -- "$printf_format" "$gitstring")
 526                 else
 527                         printf -v gitstring -- "$printf_format" "$gitstring"
 528                 fi
 529                 PS1="$ps1pc_start$gitstring$ps1pc_end"
 530         else
 531                 printf -- "$printf_format" "$gitstring"
 532         fi
 533
 534         return $exit
 535 }