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Feature request: External grep support

From: Marcus Harnisch
Subject: Feature request: External grep support
Date: Wed, 29 Apr 2020 23:12:19 +0200

Hi Shigio

Until now I hadn't noticed that global has its own grep implementation.
It turns out that running ‘grep -l’ with a fixed string pattern on the list of files obtained with ‘global -P’ consumes about a quarter of the time of the corresponding ‘global -g’ command in a non-trivial code base (emacs-master, total size of files searched amounting to 79MB).
Modern grep replacements, such as ripgrep (https://github.com/BurntSushi/ripgrep) are even faster than that. Exact numbers will obviously differ based on the actual pattern used.
Perhaps grep() could be changed to off-loading to an external tool (possibly even configurable via gtags.conf)


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