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From: | Jim Porter |
Subject: | Re: How best to set grep command based on current directory? |
Date: | Sat, 9 Apr 2022 15:43:22 -0700 |
On 4/8/2022 6:10 PM, Michael Welsh Duggan wrote:
I would like to change the program invocation in "M-x grep" (or maybe "M-x grep-find") to default to "git grep" when in directories that are in git trees. I could hack away at the grep.el sources to do this, or I could write some advice around the grep command to do this, but I want to ask here, first, if anyone believes that there is a more principled way to make this change.
If *recursive* grep is ok (as opposed to `M-x grep'), that's what I wrote urgrep[1] to do. It's aware of Git directories as well as remote Tramp hosts that may have a different set of commands available for use. I've seen using it for a while and I think I've worked out most of the bugs. (I haven't submitted it for inclusion in GNU ELPA yet since I'm still debating on what to do with a few parts, especially the API.)
If not, maybe the code will at least give you some ideas. After a fair bit of experimentation, I found that the following command produces the most consistent rgrep-like results for both Git and non-Git directories:
git grep --no-index --exclude-standardEven within Git repos, I found the above to work best, since it searches untracked files (excluding .gitignored files) and recurses into submodules. The fact that it also works well for non-Git directories is a nice bonus too.
- Jim [1] https://github.com/jimporter/urgrep
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