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+# bash/zsh git prompt support
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+#
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+# Copyright (C) 2006,2007 Shawn O. Pearce <spearce@spearce.org>
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+# Distributed under the GNU General Public License, version 2.0.
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+#
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+# This script allows you to see the current branch in your prompt.
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+#
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+# To enable:
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+#
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+# 1) Copy this file to somewhere (e.g. ~/.git-prompt.sh).
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+# 2) Add the following line to your .bashrc/.zshrc:
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+# source ~/.git-prompt.sh
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+# 3) Change your PS1 to also show the current branch:
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+# Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
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+# ZSH: PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
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+#
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+# The argument to __git_ps1 will be displayed only if you are currently
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+# in a git repository. The %s token will be the name of the current
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+# branch.
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+#
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+# In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
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+# unstaged (*) and staged (+) changes will be shown next to the branch
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+# name. You can configure this per-repository with the
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+# bash.showDirtyState variable, which defaults to true once
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+# GIT_PS1_SHOWDIRTYSTATE is enabled.
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+#
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+# You can also see if currently something is stashed, by setting
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+# GIT_PS1_SHOWSTASHSTATE to a nonempty value. If something is stashed,
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+# then a '$' will be shown next to the branch name.
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+#
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+# If you would like to see if there're untracked files, then you can set
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+# GIT_PS1_SHOWUNTRACKEDFILES to a nonempty value. If there're untracked
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+# files, then a '%' will be shown next to the branch name.
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+#
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+# If you would like to see the difference between HEAD and its upstream,
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+# set GIT_PS1_SHOWUPSTREAM="auto". A "<" indicates you are behind, ">"
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+# indicates you are ahead, "<>" indicates you have diverged and "="
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+# indicates that there is no difference. You can further control
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+# behaviour by setting GIT_PS1_SHOWUPSTREAM to a space-separated list
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+# of values:
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+#
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+# verbose show number of commits ahead/behind (+/-) upstream
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+# legacy don't use the '--count' option available in recent
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+# versions of git-rev-list
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+# git always compare HEAD to @{upstream}
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+# svn always compare HEAD to your SVN upstream
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+#
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+# By default, __git_ps1 will compare HEAD to your SVN upstream if it can
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+# find one, or @{upstream} otherwise. Once you have set
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+# GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
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+# setting the bash.showUpstream config variable.
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+
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+# __gitdir accepts 0 or 1 arguments (i.e., location)
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+# returns location of .git repo
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+__gitdir ()
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+{
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+ # Note: this function is duplicated in git-completion.bash
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+ # When updating it, make sure you update the other one to match.
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+ if [ -z "${1-}" ]; then
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+ if [ -n "${__git_dir-}" ]; then
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+ echo "$__git_dir"
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+ elif [ -n "${GIT_DIR-}" ]; then
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+ test -d "${GIT_DIR-}" || return 1
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+ echo "$GIT_DIR"
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+ elif [ -d .git ]; then
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+ echo .git
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+ else
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+ git rev-parse --git-dir 2>/dev/null
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+ fi
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+ elif [ -d "$1/.git" ]; then
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+ echo "$1/.git"
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+ else
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+ echo "$1"
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+ fi
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+}
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+
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+# stores the divergence from upstream in $p
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+# used by GIT_PS1_SHOWUPSTREAM
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+__git_ps1_show_upstream ()
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+{
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+ local key value
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+ local svn_remote svn_url_pattern count n
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+ local upstream=git legacy="" verbose=""
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+
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+ svn_remote=()
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+ # get some config options from git-config
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+ local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
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+ while read -r key value; do
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+ case "$key" in
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+ bash.showupstream)
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+ GIT_PS1_SHOWUPSTREAM="$value"
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+ if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
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+ p=""
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+ return
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+ fi
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+ ;;
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+ svn-remote.*.url)
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+ svn_remote[ $((${#svn_remote[@]} + 1)) ]="$value"
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+ svn_url_pattern+="\\|$value"
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+ upstream=svn+git # default upstream is SVN if available, else git
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+ ;;
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+ esac
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+ done <<< "$output"
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+
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+ # parse configuration values
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+ for option in ${GIT_PS1_SHOWUPSTREAM}; do
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+ case "$option" in
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+ git|svn) upstream="$option" ;;
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+ verbose) verbose=1 ;;
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+ legacy) legacy=1 ;;
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+ esac
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+ done
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+
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+ # Find our upstream
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+ case "$upstream" in
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+ git) upstream="@{upstream}" ;;
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+ svn*)
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+ # get the upstream from the "git-svn-id: ..." in a commit message
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+ # (git-svn uses essentially the same procedure internally)
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+ local svn_upstream=($(git log --first-parent -1 \
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+ --grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
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+ if [[ 0 -ne ${#svn_upstream[@]} ]]; then
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+ svn_upstream=${svn_upstream[ ${#svn_upstream[@]} - 2 ]}
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+ svn_upstream=${svn_upstream%@*}
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+ local n_stop="${#svn_remote[@]}"
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+ for ((n=1; n <= n_stop; n++)); do
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+ svn_upstream=${svn_upstream#${svn_remote[$n]}}
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+ done
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+
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+ if [[ -z "$svn_upstream" ]]; then
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+ # default branch name for checkouts with no layout:
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+ upstream=${GIT_SVN_ID:-git-svn}
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+ else
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+ upstream=${svn_upstream#/}
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+ fi
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+ elif [[ "svn+git" = "$upstream" ]]; then
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+ upstream="@{upstream}"
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+ fi
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+ ;;
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+ esac
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+
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+ # Find how many commits we are ahead/behind our upstream
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+ if [[ -z "$legacy" ]]; then
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+ count="$(git rev-list --count --left-right \
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+ "$upstream"...HEAD 2>/dev/null)"
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+ else
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+ # produce equivalent output to --count for older versions of git
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+ local commits
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+ if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
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+ then
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+ local commit behind=0 ahead=0
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+ for commit in $commits
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+ do
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+ case "$commit" in
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+ "<"*) ((behind++)) ;;
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+ *) ((ahead++)) ;;
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+ esac
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+ done
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+ count="$behind $ahead"
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+ else
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+ count=""
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+ fi
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+ fi
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+
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+ # calculate the result
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+ if [[ -z "$verbose" ]]; then
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+ case "$count" in
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+ "") # no upstream
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+ p="" ;;
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+ "0 0") # equal to upstream
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+ p="=" ;;
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+ "0 "*) # ahead of upstream
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+ p=">" ;;
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+ *" 0") # behind upstream
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+ p="<" ;;
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+ *) # diverged from upstream
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+ p="<>" ;;
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+ esac
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+ else
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+ case "$count" in
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+ "") # no upstream
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+ p="" ;;
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+ "0 0") # equal to upstream
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+ p=" u=" ;;
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+ "0 "*) # ahead of upstream
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+ p=" u+${count#0 }" ;;
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+ *" 0") # behind upstream
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+ p=" u-${count% 0}" ;;
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+ *) # diverged from upstream
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+ p=" u+${count#* }-${count% *}" ;;
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+ esac
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+ fi
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+
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+}
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+
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+
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+# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
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+# returns text to add to bash PS1 prompt (includes branch name)
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+__git_ps1 ()
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+{
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+ local g="$(__gitdir)"
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+ if [ -n "$g" ]; then
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+ local r=""
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+ local b=""
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+ if [ -f "$g/rebase-merge/interactive" ]; then
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+ r="|REBASE-i"
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+ b="$(cat "$g/rebase-merge/head-name")"
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+ elif [ -d "$g/rebase-merge" ]; then
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+ r="|REBASE-m"
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+ b="$(cat "$g/rebase-merge/head-name")"
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+ else
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+ if [ -d "$g/rebase-apply" ]; then
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+ if [ -f "$g/rebase-apply/rebasing" ]; then
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+ r="|REBASE"
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+ elif [ -f "$g/rebase-apply/applying" ]; then
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+ r="|AM"
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+ else
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+ r="|AM/REBASE"
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+ fi
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+ elif [ -f "$g/MERGE_HEAD" ]; then
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+ r="|MERGING"
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+ elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
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+ r="|CHERRY-PICKING"
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+ elif [ -f "$g/BISECT_LOG" ]; then
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+ r="|BISECTING"
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+ fi
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+
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+ b="$(git symbolic-ref HEAD 2>/dev/null)" || {
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+
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+ b="$(
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+ case "${GIT_PS1_DESCRIBE_STYLE-}" in
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+ (contains)
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+ git describe --contains HEAD ;;
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+ (branch)
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+ git describe --contains --all HEAD ;;
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+ (describe)
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+ git describe HEAD ;;
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+ (* | default)
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+ git describe --tags --exact-match HEAD ;;
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+ esac 2>/dev/null)" ||
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+
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+ b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
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+ b="unknown"
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+ b="($b)"
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+ }
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+ fi
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+
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+ local w=""
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+ local i=""
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+ local s=""
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+ local u=""
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+ local c=""
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+ local p=""
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+
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+ if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
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+ if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
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+ c="BARE:"
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+ else
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+ b="GIT_DIR!"
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+ fi
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+ elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
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+ if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ]; then
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+ if [ "$(git config --bool bash.showDirtyState)" != "false" ]; then
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+ git diff --no-ext-diff --quiet --exit-code || w="*"
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+ if git rev-parse --quiet --verify HEAD >/dev/null; then
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+ git diff-index --cached --quiet HEAD -- || i="+"
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+ else
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+ i="#"
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+ fi
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+ fi
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+ fi
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+ if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
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+ git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
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+ fi
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+
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+ if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
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+ if [ -n "$(git ls-files --others --exclude-standard)" ]; then
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+ u="%"
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+ fi
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+ fi
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+
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+ if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
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+ __git_ps1_show_upstream
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+ fi
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+ fi
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+
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+ local f="$w$i$s$u"
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+ printf -- "${1:- (%s)}" "$c${b##refs/heads/}${f:+ $f}$r$p"
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+ fi
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+}
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Felipe Contreras