Use Mercurial API to Get Changes to a Repository For a Given Changeset

Question

How can I use the Mercurial API to determine the changes made to a repository for each changeset? I am able to get a list of files relevant to a particular revision, but I cannot figure out how to tell what happened to that file.

How can I answer these questions about each file in a changeset:

• Was it added?
• Was it deleted?
• Was it modified?

Is there an attribute in the file context that will tell me this (if so, I cannot find it), or there ways to figure this out by other means?

Here is my code:

def index(request):
    u = ui.ui()
    repo = hg.repository(ui.ui(), '/path/to/repo')
    changes = repo.changelog
    changesets = []

    for change in changes:
        ctx = repo.changectx(change)
        fileCtxs = []
        for aFile in ctx.files():
            if aFile in ctx:
                for status in repo.status(None, ctx.node()):
                    # I'm hoping this could return A, M, D, ? etc
                    fileCtxs.append(status)

        changeset = {
            'files':ctx.files(),
            'rev':str(ctx.rev()),
            'desc':ctx.description(),
            'user':ctx.user(),
            'filectxs':fileCtxs,
        }
        changesets.append(changeset)

    c = Context({
        'changesets': changesets,
    })

    tmplt = loader.get_template('web/index.html')
    return HttpResponse(tmplt.render(c))

Answer 1

localrepo.status() can take contexts as argument (node1 and node2).

See http://hg.intevation.org/mercurial/crew/file/6505773080e4/mercurial/localrepo.py#l973