Mercurial Hook - change a commit message pre commit

Question

Edit Made this basic hook to prevent branch name & commit message bugID mismatches. https://gist.github.com/2583189

So basically the idea is that th

Answer 1

i think the problem here is that the pretxncommit hook is executed at a point where you can't really change anything anymore. And you can't really get the commit message at that point either, because it's not set on any context object accessible.

repo['tip'].description() doesn't refer to the changelog being committed but to old tip already committed, that would be repo[None], but as some digging in the source revealed it's not the same context object that's being persisted, so it's no point in changing it.

the only way i could find would be to use an earlier hook - like precommit - and monkeypatch the commitctx method of the repository like this:

def precommit_hook(repo, **kwargs):

    # keep a copy of repo.commitctx
    commitctx = repo.commitctx

    def updatectx(ctx, error):

        # check if `ctx.branch()` matches ...

        # update commit text
        ctx._text += " ... additional text"

        # call original
        return commitctx(ctx, error)

    # monkeypatch the commit method
    repo.commitctx = updatectx

this way cou can access the context object just before it's committed.