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