Add Fix Whitespace Errors Throughout Branch Commits as a Git TIL

git/fix-whitespace-errors-throughout-branch-commits.md

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+# Fix Whitespace Errors Throughout Branch Commits
+
+Let's say we've been working on some changes to our repository on a branch.
+We've made several commits. We are close to putting up a PR, but we want to
+make sure everything is tidied up.
+
+We run a check and see that there are some whitespace errors that should be
+fixed.
+
+```bash
+$ git diff main --check
+README.md:1: trailing whitespace.
++# git-playground
+script.sh:9: trailing whitespace.
++
+```
+
+This post isn't able to show the highlighted whitespace errors, but we can see
+the warnings above.
+
+Rather than cluttering things with an additional commit that fixes these errors
+or manually cleaning up each commit, we can ask `git` to fix it for us.
+
+```bash
+$ git rebase --whitespace=fix main
+```
+
+That will do a manual rebase of each commit addressing the whitespace errors.
+
+We can run the error check again and see no output, which means we are good to
+go.
+
+```bash
+$ git diff main --check
+```
+
+See the section on `--whitespace` in `man git-apply` for more details.
+
+[source](https://git-scm.com/book/en/v2/Customizing-Git-Git-Configuration)