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[PATCH 13/19] bash prompt: check whether inside the worktree only when necessary

From
SZEDER Gábor <szeder@ira.uka.de>
Date
May 9, 2012, 00:44 UTC
Message-ID
<1336524290-30023-14-git-send-email-szeder@ira.uka.de>
In-Reply-To
<1336524290-30023-1-git-send-email-szeder@ira.uka.de>

Besides the current branch name or detached head info __git_ps1() can also display status indicators in the prompt for changes in the work tree, stashes, untracked files, and divergence from upstream. These are only displayed when enabled by specific environment variables and when we are in a work tree. The latter condition is checked by the '$(git rev-parse --is-inside-work-tree)' command substitution, impossing the overhead of fork()ing a subshell and fork()+exec()ing a git process.

However, the check for the work tree preceeds the check of the environment variables enabling status indicators, so it's evaluated even when all these indicators are disabled.

Check upfront whether any of these indicators are enabled, i.e. a corresponding environment variable is set, to spare the unnecessary fork()+exec() overhead when all of them are disabled.

(Ideally we could check whether we are in a work tree using only bash builtins, like we did in the previous commit for .git directory, but the path of the work tree can be specified by the 'core.worktree' config variable, and running 'git config' to get its value would be just as expensive.)

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
---
 contrib/completion/git-completion.bash | 42 +++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 18 deletions(-)
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 72f7d0ed..64b96f13 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -333,29 +333,35 @@ __git_ps1 ()
 		else
 			b="GIT_DIR!"
 		fi
-	elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
-		if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ]; then
-			if [ "$(git config --bool bash.showDirtyState)" != "false" ]; then
-				git diff --no-ext-diff --quiet --exit-code || w="*"
-				if git rev-parse --quiet --verify HEAD >/dev/null; then
-					git diff-index --cached --quiet HEAD -- || i="+"
-				else
-					i="#"
+	elif [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" \
+			-o -n "${GIT_PS1_SHOWSTASHSTATE-}" \
+			-o -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" \
+			-n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
+		if [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
+			if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ]; then
+				if [ "$(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
 			fi
-		fi
-		if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
-			git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
-		fi
 
-		if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
-			if [ -n "$(git ls-files --others --exclude-standard)" ]; then
-				u="%"
+			if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
+			        git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
 			fi
-		fi
 
-		if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
-			__git_ps1_show_upstream
+			if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
+				if [ -n "$(git ls-files --others --exclude-standard)" ]; then
+					u="%"
+				fi
+			fi
+
+			if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
+				__git_ps1_show_upstream
+			fi
 		fi
 	fi
 

-- 
1.7.10.1.541.gb1be298
Previous: Junio C HamanoNext: SZEDER Gábor
Message 41 of 50 in “Bash prompt speedup”
  1. 00/19 Bash prompt speedupSZEDER Gábor, May 9, 2012
  2. 01/19 tests: move code to run tests under bash into a helper librarySZEDER Gábor, May 9, 2012
  3. 02/19 tests: add tests for the bash prompt functions in the completion scriptSZEDER Gábor, May 9, 2012
  4. Johannes SixtMay 9, 2012
  5. Junio C HamanoMay 9, 2012
  6. Johannes SixtMay 10, 2012
  7. Junio C HamanoMay 9, 2012
  8. SZEDER GáborMay 9, 2012
  9. 03/19 completion: use __gitdir() in _git_log()SZEDER Gábor, May 9, 2012
  10. Junio C HamanoMay 9, 2012
  11. SZEDER GáborMay 9, 2012
  12. 04/19 completion: respect $GIT_DIRSZEDER Gábor, May 9, 2012
  13. Johannes SixtMay 9, 2012
  14. Junio C HamanoMay 9, 2012
  15. 05/19 bash prompt: don't show the prompt when .git/HEAD is unreadableSZEDER Gábor, May 9, 2012
  16. Junio C HamanoMay 9, 2012
  17. SZEDER GáborMay 9, 2012
  18. 06/19 bash prompt: return early from __git_ps1() when not in a git repositorySZEDER Gábor, May 9, 2012
  19. 07/19 completion: make __gitdir() store repository path in $__git_dirSZEDER Gábor, May 9, 2012
  20. Junio C HamanoMay 9, 2012
  21. 08/19 completion: use $__git_dir instead of $(__gitdir)SZEDER Gábor, May 9, 2012
  22. Junio C HamanoMay 9, 2012
  23. SZEDER GáborMay 9, 2012
  24. Junio C HamanoMay 9, 2012
  25. SZEDER GáborMay 9, 2012
  26. 09/19 completion: platform-specific helper function to get physical pathSZEDER Gábor, May 9, 2012
  27. Johannes SixtMay 9, 2012
  28. 10/19 completion: use bash builtins to search for repositorySZEDER Gábor, May 9, 2012
  29. Junio C HamanoMay 9, 2012
  30. SZEDER GáborMay 9, 2012
  31. Junio C HamanoMay 9, 2012
  32. 11/19 bash prompt: use bash builtins to find out current branchSZEDER Gábor, May 9, 2012
  33. Junio C HamanoMay 9, 2012
  34. SZEDER GáborMay 9, 2012
  35. Junio C HamanoMay 9, 2012
  36. SZEDER GáborMay 9, 2012
  37. Junio C HamanoMay 9, 2012
  38. 12/19 bash prompt: use bash builtins to check whether inside git dirSZEDER Gábor, May 9, 2012
  39. Johannes SixtMay 9, 2012
  40. Junio C HamanoMay 9, 2012
  41. 13/19 bash prompt: check whether inside the worktree only when necessarySZEDER Gábor, May 9, 2012
  42. 14/19 bash prompt: use bash builtins to find out current branch during rebaseSZEDER Gábor, May 9, 2012
  43. 15/19 bash prompt: use bash builtins to get detached HEAD abbrev. object nameSZEDER Gábor, May 9, 2012
  44. 16/19 bash prompt: display stash and upstream state even inside the repositorySZEDER Gábor, May 9, 2012
  45. 17/19 bash prompt: use bash builtins to check stash stateSZEDER Gábor, May 9, 2012
  46. 18/19 bash prompt: avoid command substitution when checking for untracked filesSZEDER Gábor, May 9, 2012
  47. Junio C HamanoMay 9, 2012
  48. 19/19 bash prompt: alternative git prompt without command substitutionSZEDER Gábor, May 9, 2012
  49. Andrew SayersMay 9, 2012
  50. SZEDER GáborMay 9, 2012

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