From 94408dc71c0410a385193171cc79d230920b85fa Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?SZEDER=20G=C3=A1bor?= Date: Wed, 18 Apr 2018 00:02:19 +0200 Subject: completion: reduce overhead of clearing cached --options MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To get the names of all '$__git_builtin_*' variables caching --options of builtin commands in order to unset them, 8b0eaa41f2 (completion: clear cached --options when sourcing the completion script, 2018-03-22) runs a 'set |sed s///' pipeline. This works both in Bash and in ZSH, but has a higher than necessary overhead with the extra processes. In Bash we can do better: run the 'compgen -v __gitcomp_builtin_' builtin command, which lists the same variables, but without a pipeline and 'sed' it can do so with lower overhead. ZSH will still continue to run that pipeline. This change also happens to work around an issue in the default Bash version shipped in macOS (3.2.57), reported by users of the Powerline shell prompt, which was triggered by the same commit 8b0eaa41f2 as well. Powerline uses several Unicode Private Use Area code points to represent some of its pretty text UI elements (arrows and what not), and these are stored in the $PS1 variable. Apparently the 'set' builtin of said Bash version on macOS has issues with these code points, and produces garbled output where Powerline's special symbols should be in the $PS1 variable. This, in turn, triggers the following error message in the downstream 'sed' process: sed: RE error: illegal byte sequence Other Bash versions, notably 4.4.19 on macOS via homebrew (i.e. a newer version on the same platform) and 3.2.25 on CentOS (i.e. a slightly earlier version, though on a different platform) are not affected. ZSH in macOS (the versions shipped by default or installed via homebrew) or on other platforms isn't affected either. With this patch neither the 'set' builtin is invoked to print garbage, nor 'sed' to choke on it. Issue-on-macOS-reported-by: Stephon Harris Issue-on-macOS-explained-by: Matthew Coleman Signed-off-by: SZEDER Gábor Signed-off-by: Junio C Hamano --- contrib/completion/git-completion.bash | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash index b09c8a2362..4ef59a51be 100644 --- a/contrib/completion/git-completion.bash +++ b/contrib/completion/git-completion.bash @@ -282,7 +282,11 @@ __gitcomp () # Clear the variables caching builtins' options when (re-)sourcing # the completion script. -unset $(set |sed -ne 's/^\(__gitcomp_builtin_[a-zA-Z0-9_][a-zA-Z0-9_]*\)=.*/\1/p') 2>/dev/null +if [[ -n ${ZSH_VERSION-} ]]; then + unset $(set |sed -ne 's/^\(__gitcomp_builtin_[a-zA-Z0-9_][a-zA-Z0-9_]*\)=.*/\1/p') 2>/dev/null +else + unset $(compgen -v __gitcomp_builtin_) +fi # This function is equivalent to # -- cgit v1.2.3