templater: keep default resources per template engine (API)
This allows us to register a repo object as a resource in hgweb template,
without loosing '{repo}' symbol:
symbol('repo') -> mapping['repo'] (n/a) -> defaults['repo']
resource('repo') -> mapping['repo'] (n/a) -> resources['repo']
I'm thinking of redesigning the templatekw API to take (context, mapping)
in place of **(context._resources + mapping), but that will be a big change
and not implemented yet.
props['templ'] is ported to the resources dict as an example.
.. api::
mapping does not contain all template resources. use context.resource()
in template functions.
$ cat > engine.py << EOF
>
> from mercurial import templater
>
> class mytemplater(object):
> def __init__(self, loader, filters, defaults, resources, aliases):
> self.loader = loader
> self._resources = resources
>
> def process(self, t, map):
> tmpl = self.loader(t)
> for k, v in map.iteritems():
> if k in ('templ', 'ctx', 'repo', 'revcache', 'cache', 'troubles'):
> continue
> if hasattr(v, '__call__'):
> props = self._resources.copy()
> props.update(map)
> v = v(**props)
> v = templater.stringify(v)
> tmpl = tmpl.replace('{{%s}}' % k, v)
> yield tmpl
>
> templater.engines['my'] = mytemplater
> EOF
$ hg init test
$ echo '[extensions]' > test/.hg/hgrc
$ echo "engine = `pwd`/engine.py" >> test/.hg/hgrc
$ cd test
$ cat > mymap << EOF
> changeset = my:changeset.txt
> EOF
$ cat > changeset.txt << EOF
> {{rev}} {{node}} {{author}}
> EOF
$ hg ci -Ama
adding changeset.txt
adding mymap
$ hg log --style=./mymap
0 97e5f848f0936960273bbf75be6388cd0350a32b test
$ cat > changeset.txt << EOF
> {{p1rev}} {{p1node}} {{p2rev}} {{p2node}}
> EOF
$ hg ci -Ama
$ hg log --style=./mymap
0 97e5f848f0936960273bbf75be6388cd0350a32b -1 0000000000000000000000000000000000000000
-1 0000000000000000000000000000000000000000 -1 0000000000000000000000000000000000000000
invalid engine type:
$ echo 'changeset = unknown:changeset.txt' > unknownenginemap
$ hg log --style=./unknownenginemap
abort: invalid template engine: unknown
[255]
$ cd ..