Re: [PATCH 3/3] Revert "bash prompt: avoid command substitution when finalizing gitstring"

On Wed, Aug 21, 2013 at 2:47 PM, Junio C Hamano [off-list ref] wrote:

Brandon Casey [off-list ref] writes:

quoted

From: Brandon Casey <redacted>

This reverts commit 69a8141a5d81925b7e08cb228535e9ea4a7a02e3.

Old Bash (3.0) which is distributed with RHEL 4.X and other ancient
platforms that are still in wide use, does not have a printf that
supports -v.  Let's revert this patch and go back to using printf
in the traditional way.

Signed-off-by: Brandon Casey <redacted>
---

Is this something you can detect at load-time once, store the result
in a private variable and then switch on it at runtime, something
along the lines of...


        # on load...
        printf -v __git_printf_supports_v -- "%s" yes >/dev/null 2>&1

        ...

        if test "${__git_printf_supports_v}" = yes
        then
                printf -v gitstring -- "$printf_format" "$gitstring"
        else
                gitstring=$(printf -- "$printf_format" "$gitstring")
        fi

Yes, that appears to work.

-Brandon

quoted

 contrib/completion/git-prompt.sh | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index a81ef5a..7698ec4 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh

@@ -433,11 +433,7 @@ __git_ps1 ()
      local gitstring="$c${b##refs/heads/}${f:+$z$f}$r$p"

      if [ $pcmode = yes ]; then
-             if [[ -n ${ZSH_VERSION-} ]]; then
-                     gitstring=$(printf -- "$printf_format" "$gitstring")
-             else
-                     printf -v gitstring -- "$printf_format" "$gitstring"
-             fi
+             gitstring=$(printf -- "$printf_format" "$gitstring")
              PS1="$ps1pc_start$gitstring$ps1pc_end"
      else
              printf -- "$printf_format" "$gitstring"