I think a person’s command-line prompt says a lot about them. Some people have big fancy prompts with tidbits of data; some people have simple black & white prompts. Some people like fancy or frivolous things like smiley and frowny faces based on the error status of the last command; some people are strictly utilitarian. I mostly fall into the last category – I like some color with my prompts when possible, but otherwise I only want to see my name, server, cwd, and VCS branch (if any).
/etc/profile
...
if [ -n "${BASH_VERSION}" ] ; then
# Newer bash ebuilds include /etc/bash/bashrc which will setup PS1
# including color. We leave out color here because not all
# terminals support it.
if [ -f /etc/bash/bashrc ] ; then
# Bash login shells run only /etc/profile
# Bash non-login shells run only /etc/bash/bashrc
# Since we want to run /etc/bash/bashrc regardless, we source it
# from here. It is unfortunate that there is no way to do
# this *after* the user's .bash_profile runs (without putting
# it in the user's dot-files), but it shouldn't make any
# difference.
. /etc/bash/bashrc
else
PS1='\u@\h \w \$ '
fi
else
# Setup a bland default prompt. Since this prompt should be useable
# on color and non-color terminals, as well as shells that don't
# understand sequences such as \h, don't put anything special in it.
PS1="${USER:-$(whoami 2>/dev/null)}@$(uname -n 2>/dev/null) \$ "
fi
...
~/.bashrc
...
# Load in the git branch prompt script, and alter PS1 to include the
# current branch on the prompt
source ~/.git-prompt
# PS1 may include an extra space at the end, so trim it off so we can
# include the altered prompt and a space
PS1=${PS1/% /}'$(__git_ps1 " (%s)") '
...
The code for .git-prompt is a little longer, and credit goes to Shawn O. Pearce. There’s probably a more-compact version somewhere but this works well-enough for my needs.
~/.git-prompt
# bash/zsh git prompt support
#
# Copyright (C) 2006,2007 Shawn O. Pearce <spearce@spearce.org>
# Distributed under the GNU General Public License, version 2.0.
#
# This script allows you to see the current branch in your prompt.
#
# To enable:
#
# 1) Copy this file to somewhere (e.g. ~/.git-prompt.sh).
# 2) Add the following line to your .bashrc/.zshrc:
# source ~/.git-prompt.sh
# 3a) Change your PS1 to call __git_ps1 as
# command-substitution:
# Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
# ZSH: PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
# the optional argument will be used as format string.
# 3b) Alternatively, if you are using bash, __git_ps1 can be
# used for PROMPT_COMMAND with two parameters, <pre> and
# <post>, which are strings you would put in $PS1 before
# and after the status string generated by the git-prompt
# machinery. e.g.
# PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
# will show username, at-sign, host, colon, cwd, then
# various status string, followed by dollar and SP, as
# your prompt.
# Optionally, you can supply a third argument with a printf
# format string to finetune the output of the branch status
#
# The argument to __git_ps1 will be displayed only if you are currently
# in a git repository. The %s token will be the name of the current
# branch.
#
# In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
# unstaged (*) and staged (+) changes will be shown next to the branch
# name. You can configure this per-repository with the
# bash.showDirtyState variable, which defaults to true once
# GIT_PS1_SHOWDIRTYSTATE is enabled.
#
# You can also see if currently something is stashed, by setting
# GIT_PS1_SHOWSTASHSTATE to a nonempty value. If something is stashed,
# then a '$' will be shown next to the branch name.
#
# If you would like to see if there're untracked files, then you can set
# GIT_PS1_SHOWUNTRACKEDFILES to a nonempty value. If there're untracked
# files, then a '%' will be shown next to the branch name. You can
# configure this per-repository with the bash.showUntrackedFiles
# variable, which defaults to true once GIT_PS1_SHOWUNTRACKEDFILES is
# enabled.
#
# If you would like to see the difference between HEAD and its upstream,
# set GIT_PS1_SHOWUPSTREAM="auto". A "<" indicates you are behind, ">"
# indicates you are ahead, "<>" indicates you have diverged and "="
# indicates that there is no difference. You can further control
# behaviour by setting GIT_PS1_SHOWUPSTREAM to a space-separated list
# of values:
#
# verbose show number of commits ahead/behind (+/-) upstream
# legacy don't use the '--count' option available in recent
# versions of git-rev-list
# git always compare HEAD to @{upstream}
# svn always compare HEAD to your SVN upstream
#
# By default, __git_ps1 will compare HEAD to your SVN upstream if it can
# find one, or @{upstream} otherwise. Once you have set
# GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
# setting the bash.showUpstream config variable.
#
# If you would like to see more information about the identity of
# commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
# to one of these values:
#
# contains relative to newer annotated tag (v1.6.3.2~35)
# branch relative to newer tag or branch (master~4)
# describe relative to older annotated tag (v1.6.3.1-13-gdd42c2f)
# default exactly matching tag
#
# If you would like a colored hint about the current dirty state, set
# GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
# the colored output of "git status -sb".
# __gitdir accepts 0 or 1 arguments (i.e., location)
# returns location of .git repo
__gitdir ()
{
# Note: this function is duplicated in git-completion.bash
# When updating it, make sure you update the other one to match.
if [ -z "${1-}" ]; then
if [ -n "${__git_dir-}" ]; then
echo "$__git_dir"
elif [ -n "${GIT_DIR-}" ]; then
test -d "${GIT_DIR-}" || return 1
echo "$GIT_DIR"
elif [ -d .git ]; then
echo .git
else
git rev-parse --git-dir 2>/dev/null
fi
elif [ -d "$1/.git" ]; then
echo "$1/.git"
else
echo "$1"
fi
}
# stores the divergence from upstream in $p
# used by GIT_PS1_SHOWUPSTREAM
__git_ps1_show_upstream ()
{
local key value
local svn_remote svn_url_pattern count n
local upstream=git legacy="" verbose=""
svn_remote=()
# get some config options from git-config
local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
while read -r key value; do
case "$key" in
bash.showupstream)
GIT_PS1_SHOWUPSTREAM="$value"
if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
p=""
return
fi
;;
svn-remote.*.url)
svn_remote[ $((${#svn_remote[@]} + 1)) ]="$value"
svn_url_pattern+="\\|$value"
upstream=svn+git # default upstream is SVN if available, else git
;;
esac
done <<< "$output"
# parse configuration values
for option in ${GIT_PS1_SHOWUPSTREAM}; do
case "$option" in
git|svn) upstream="$option" ;;
verbose) verbose=1 ;;
legacy) legacy=1 ;;
esac
done
# Find our upstream
case "$upstream" in
git) upstream="@{upstream}" ;;
svn*)
# get the upstream from the "git-svn-id: ..." in a commit message
# (git-svn uses essentially the same procedure internally)
local svn_upstream=($(git log --first-parent -1 \
--grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
if [[ 0 -ne ${#svn_upstream[@]} ]]; then
svn_upstream=${svn_upstream[ ${#svn_upstream[@]} - 2 ]}
svn_upstream=${svn_upstream%@*}
local n_stop="${#svn_remote[@]}"
for ((n=1; n <= n_stop; n++)); do
svn_upstream=${svn_upstream#${svn_remote[$n]}}
done
if [[ -z "$svn_upstream" ]]; then
# default branch name for checkouts with no layout:
upstream=${GIT_SVN_ID:-git-svn}
else
upstream=${svn_upstream#/}
fi
elif [[ "svn+git" = "$upstream" ]]; then
upstream="@{upstream}"
fi
;;
esac
# Find how many commits we are ahead/behind our upstream
if [[ -z "$legacy" ]]; then
count="$(git rev-list --count --left-right \
"$upstream"...HEAD 2>/dev/null)"
else
# produce equivalent output to --count for older versions of git
local commits
if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
then
local commit behind=0 ahead=0
for commit in $commits
do
case "$commit" in
"<"*) ((behind++)) ;;
*) ((ahead++)) ;;
esac
done
count="$behind $ahead"
else
count=""
fi
fi
# calculate the result
if [[ -z "$verbose" ]]; then
case "$count" in
"") # no upstream
p="" ;;
"0 0") # equal to upstream
p="=" ;;
"0 "*) # ahead of upstream
p=">" ;;
*" 0") # behind upstream
p="<" ;;
*) # diverged from upstream
p="<>" ;;
esac
else
case "$count" in
"") # no upstream
p="" ;;
"0 0") # equal to upstream
p=" u=" ;;
"0 "*) # ahead of upstream
p=" u+${count#0 }" ;;
*" 0") # behind upstream
p=" u-${count% 0}" ;;
*) # diverged from upstream
p=" u+${count#* }-${count% *}" ;;
esac
fi
}
# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
# when called from PS1 using command substitution
# in this mode it prints text to add to bash PS1 prompt (includes branch name)
#
# __git_ps1 requires 2 or 3 arguments when called from PROMPT_COMMAND (pc)
# in that case it _sets_ PS1. The arguments are parts of a PS1 string.
# when two arguments are given, the first is prepended and the second appended
# to the state string when assigned to PS1.
# The optional third parameter will be used as printf format string to further
# customize the output of the git-status string.
# In this mode you can request colored hints using GIT_PS1_SHOWCOLORHINTS=true
__git_ps1 ()
{
local pcmode=no
local detached=no
local ps1pc_start='\u@\h:\w '
local ps1pc_end='\$ '
local printf_format=' (%s)'
case "$#" in
2|3) pcmode=yes
ps1pc_start="$1"
ps1pc_end="$2"
printf_format="${3:-$printf_format}"
;;
0|1) printf_format="${1:-$printf_format}"
;;
*) return
;;
esac
local g="$(__gitdir)"
if [ -z "$g" ]; then
if [ $pcmode = yes ]; then
#In PC mode PS1 always needs to be set
PS1="$ps1pc_start$ps1pc_end"
fi
else
local r=""
local b=""
if [ -f "$g/rebase-merge/interactive" ]; then
r="|REBASE-i"
b="$(cat "$g/rebase-merge/head-name")"
elif [ -d "$g/rebase-merge" ]; then
r="|REBASE-m"
b="$(cat "$g/rebase-merge/head-name")"
else
if [ -d "$g/rebase-apply" ]; then
if [ -f "$g/rebase-apply/rebasing" ]; then
r="|REBASE"
elif [ -f "$g/rebase-apply/applying" ]; then
r="|AM"
else
r="|AM/REBASE"
fi
elif [ -f "$g/MERGE_HEAD" ]; then
r="|MERGING"
elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
r="|CHERRY-PICKING"
elif [ -f "$g/BISECT_LOG" ]; then
r="|BISECTING"
fi
b="$(git symbolic-ref HEAD 2>/dev/null)" || {
detached=yes
b="$(
case "${GIT_PS1_DESCRIBE_STYLE-}" in
(contains)
git describe --contains HEAD ;;
(branch)
git describe --contains --all HEAD ;;
(describe)
git describe HEAD ;;
(* | default)
git describe --tags --exact-match HEAD ;;
esac 2>/dev/null)" ||
b="$(cut -c1-7 "$g/HEAD" 2>/dev/null)..." ||
b="unknown"
b="($b)"
}
fi
local w=""
local i=""
local s=""
local u=""
local c=""
local p=""
if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
c="BARE:"
else
b="GIT_DIR!"
fi
elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ] &&
[ "$(git config --bool bash.showDirtyState)" != "false" ]
then
git diff --no-ext-diff --quiet --exit-code || w="*"
if git rev-parse --quiet --verify HEAD >/dev/null; then
git diff-index --cached --quiet HEAD -- || i="+"
else
i="#"
fi
fi
if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
fi
if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
[ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
[ -n "$(git ls-files --others --exclude-standard)" ]
then
u="%"
fi
if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
__git_ps1_show_upstream
fi
fi
local f="$w$i$s$u"
if [ $pcmode = yes ]; then
local gitstring=
if [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
local c_red='\e[31m'
local c_green='\e[32m'
local c_lblue='\e[1;34m'
local c_clear='\e[0m'
local bad_color=$c_red
local ok_color=$c_green
local branch_color="$c_clear"
local flags_color="$c_lblue"
local branchstring="$c${b##refs/heads/}"
if [ $detached = no ]; then
branch_color="$ok_color"
else
branch_color="$bad_color"
fi
# Setting gitstring directly with \[ and \] around colors
# is necessary to prevent wrapping issues!
gitstring="\[$branch_color\]$branchstring\[$c_clear\]"
if [ -n "$w$i$s$u$r$p" ]; then
gitstring="$gitstring "
fi
if [ "$w" = "*" ]; then
gitstring="$gitstring\[$bad_color\]$w"
fi
if [ -n "$i" ]; then
gitstring="$gitstring\[$ok_color\]$i"
fi
if [ -n "$s" ]; then
gitstring="$gitstring\[$flags_color\]$s"
fi
if [ -n "$u" ]; then
gitstring="$gitstring\[$bad_color\]$u"
fi
gitstring="$gitstring\[$c_clear\]$r$p"
else
gitstring="$c${b##refs/heads/}${f:+ $f}$r$p"
fi
gitstring=$(printf -- "$printf_format" "$gitstring")
PS1="$ps1pc_start$gitstring$ps1pc_end"
else
# NO color option unless in PROMPT_COMMAND mode
printf -- "$printf_format" "$c${b##refs/heads/}${f:+ $f}$r$p"
fi
fi
}
