Body:
Currently actwhy infers changed files from the working tree versus upstream. A --diff ref..ref flag would let users simulate an arbitrary range — for example what a merge, a rebase, or a specific PR's diff would trigger.
Scope:
- Accept
--diff main..feature (and the two-dot / three-dot forms) on the push and pr subcommands.
- Resolve the changed-file list from
git diff --name-only <range>.
- Fall back cleanly (with a clear message) when the refs do not exist locally.
This is mostly a src/cli/ change; the core already accepts a file list.
Body:
Currently actwhy infers changed files from the working tree versus upstream. A
--diff ref..refflag would let users simulate an arbitrary range — for example what a merge, a rebase, or a specific PR's diff would trigger.Scope:
--diff main..feature(and the two-dot / three-dot forms) on thepushandprsubcommands.git diff --name-only <range>.This is mostly a
src/cli/change; the core already accepts a file list.