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doc: add note about --pre-glob

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There was a performance warning in the --pre docs, but didn't mention
--pre-glob as a possible mitigation to it.
This commit is contained in:
Andrew Gallant 2019-04-15 10:27:28 -04:00
parent e79085e9e4
commit 3fe701498e
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src/app.rs
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@ -2019,7 +2019,8 @@ or the '--no-pre' flag will disable this behavior.
WARNING: When this flag is set, ripgrep will unconditionally spawn a
process for every file that is searched. Therefore, this can incur an
unnecessarily large performance penalty if you don't otherwise need the
flexibility offered by this flag.
flexibility offered by this flag. One possible mitigation to this is to use
the '--pre-glob' flag to limit which files a preprocessor is run with.
A preprocessor is not run when ripgrep is searching stdin.