Fwd: Enriching a file log by branches, tags and bookmarks

[Matt Mackall]

On Fri, 2015-04-03 at 15:55 +0200, Marc Strapetz wrote:
> On 02.04.2015 21:08, Matt Mackall wrote:
> > So if the file log shows revisions 1 and 10, but there's a 1.0 tag at 5,
> > we want to show the tag on 1 to say "this was in 1.0". Right now {tags}
> > will only tell you about tags on the current changeset and doesn't know
> > which set of changesets are going to be displayed.
> >
> > So we don't in fact have a good way to do what's wanted here in a
> > template at present.
> 
> I'm not necessarily looking for a template, it will also be fine if this 
> could be done within a plugin. I couldn't find any high-level API which 
> I could use to compose something useful here. Do you have any suggestions?
>
> > However, I do find this useful:
> >
> > [alias]
> > tagged = log -r 'first($1:: and tagged())'
> 
> AFAIU this gives me the most recent tag for a specific revision? I don't 
> understand what happens here but could that be generalized to do what 
> I'm looking for?

$ hg log -r 'last(::. and file(COPYING))'
changeset:   14512:8c8b55733cbd
user:        Matt Mackall <mpm at selenic.com>
date:        Thu Jun 02 11:17:02 2011 -0500
summary:     COPYING: refresh with current address from fsf.org

The last ancestor (::) of my current working copy (.) to touch COPYING was changeset 14512.

$ hg log -r 'first(14512:: and tagged())'
changeset:   14825:de9eb6b1da4f
branch:      stable
tag:         1.9
user:        Mads Kiilerich <mads at kiilerich.com>
date:        Fri Jul 01 17:37:09 2011 +0200
summary:     util: rename the util.localpath that uses url to urllocalpath (issue2875)

The first descendant (:: on the other side) of 14512 that was tagged was 1.9 on Jul 1 2011.

$ hg tagged 14512 -T "{tags}\n"
1.9

Put it all together:

$ hg log -r 'first(last(::. and file(COPYING)):: and tagged())' -T "{tags}\n"
1.9

-- 
Mathematics is the supreme nostalgia of our time.