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Document how to ignore specific files in a diff #1668

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12 changes: 12 additions & 0 deletions src/git.md
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Expand Up @@ -508,6 +508,18 @@ See [the docs for `--color-moved`](https://git-scm.com/docs/git-diff#Documentati
See [the relevant section for PR authors](#git-range-diff). This can be useful for comparing code
that was force-pushed to make sure there are no unexpected changes.

### Ignoring changes to specific files

Many large files in the repo are autogenerated. To view a diff that ignores changes to those files,
you can use the following syntax (e.g. Cargo.lock):

```
git log -p ':!Cargo.lock'
```

Arbitrary patterns are supported (e.g. `:!compiler/*`). Patterns use the same syntax as
`.gitignore`, with `:` prepended to indicate a pattern.

## Git submodules

**NOTE**: submodules are a nice thing to know about, but it *isn't* an absolute
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