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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@xxxxxxxxx>
---
contrib/completion/git-prompt.sh | 51 +++++++++++++++++++++++++++++++++-----
1 file changed, 45 insertions(+), 6 deletions(-)
diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 29b1ec9..4fbc1e6 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -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
@@ -194,11 +199,39 @@ __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
@@ -284,6 +317,12 @@ __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
}
--
1.7.9.5
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