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Allow __git_ps1 to be used in PROMPT_COMMAND

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Changes __git_ps1 to allow its use as PROMPT_COMMAND in bash
in addition to setting PS1 with __git_ps1 in a command substitution.
PROMPT_COMMAND has advantages for using color without running
into prompt-wrapping issues. Only by assigning \[ and \] to PS1
directly can bash know that these and the enclosed zero-width codes in
between don't count in the length of the prompt.

Signed-off-by: Simon Oosthoek <s.oosthoek@xs4all.nl>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Simon Oosthoek 2012-10-10 21:31:58 +02:00 committed by Junio C Hamano
parent d64383ab14
commit 1bfc51ac81
1 changed files with 45 additions and 6 deletions
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51
contrib/completion/git-prompt.sh
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@ -10,9 +10,14 @@
# 1) Copy this file to somewhere (e.g. ~/.git-prompt.sh).
# 2) Add the following line to your .bashrc/.zshrc:
# source ~/.git-prompt.sh
# 3) Change your PS1 to also show the current branch:
# Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
# ZSH: PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
# 3a) In ~/.bashrc set PROMPT_COMMAND=__git_ps1
# To customize the prompt, provide start/end arguments
# PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
# 3b) Alternatively 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
#
# 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
@ -195,11 +200,39 @@ __git_ps1_show_upstream ()
# __git_ps1 accepts 0 or 1 arguments (i.e., format string)
# returns text to add to bash PS1 prompt (includes branch name)
# 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 arguments when called from PROMPT_COMMAND (pc)
# in that case it _sets_ PS1. The arguments are parts of a PS1 string.
# when both arguments are given, the first is prepended and the second appended
# to the state string when assigned to PS1.
__git_ps1 ()
{
local pcmode=no
#defaults/examples:
local ps1pc_start='\u@\h:\w '
local ps1pc_end='\$ '
local printf_format=' (%s)'
case "$#" in
2) pcmode=yes
ps1pc_start="$1"
ps1pc_end="$2"
;;
0|1) printf_format="${1:-$printf_format}"
;;
*) return
;;
esac
local g="$(__gitdir)"
if [ -n "$g" ]; then
if [ -z "$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
@ -285,6 +318,12 @@ __git_ps1 ()
fi
local f="$w$i$s$u"
printf -- "${1:- (%s)}" "$c${b##refs/heads/}${f:+ $f}$r$p"
if [ $pcmode = yes ]; then
PS1="$ps1pc_start("
PS1="$PS1$c${b##refs/heads/}${f:+ $f}$r$p"
PS1="$PS1)$ps1pc_end"
else
printf -- "$printf_format" "$c${b##refs/heads/}${f:+ $f}$r$p"
fi
fi
}