Add Squash Changes Into Parent Commit Interactively as a jj TIL

jj/squash-changes-into-parent-commit-interactively.md

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+# Squash Changes Into Parent Commit Interactively
+
+While I have some changes in progress as part of the working copy, I can squash
+them into the previous / parent commit with the `jj squash` command. Running
+that command as is will apply all the working copy changes to the parent leaving
+the current revision empty.
+
+I can also interactively squash those changes similar in spirit to how I might
+use `git add --patch` to stage and then amend specific changes into the previous
+commit with `git`. This can be done with [`jj`](https://github.com/jj-vcs/jj)
+using `squash` with the `-i` flag.
+
+```bash
+jj squash -i # or --interactive
+```
+
+This will open up a TUI where I can click around or use keys. Each file in the
+source revision (in my case, the working copy) will be listed. I can move the
+cursor between them hitting _space_ to toggle them in or out of the squash
+selection.
+
+I can also hit `f` over a given file to toggle _folding_. When folding is on, a
+diff of the file will be disclosed with checkboxes for toggling individual
+hunks and lines.
+
+Once I'm satisfied with my interactive selection, I can hit `c` to confirm and
+only the selected files and changes will be squashed into the parent.
+
+See `man jj-squash` for more details.
+
+[source](https://steveklabnik.github.io/jujutsu-tutorial/real-world-workflows/the-squash-workflow.html)