43     formatter,

  1953 @command('debugtemplate',

  1954     [('r', 'rev', [], _('apply template on changesets'), _('REV')),

  1955      ('D', 'define', [], _('define template keyword'), _('KEY=VALUE'))],

  1956     _('[-r REV]... [-D KEY=VALUE]... TEMPLATE'),

  1957     optionalrepo=True)

  1958 def debugtemplate(ui, repo, tmpl, **opts):

  1959     """parse and apply a template

  1960 

  1961     If -r/--rev is given, the template is processed as a log template and

  1962     applied to the given changesets. Otherwise, it is processed as a generic

  1963     template.

  1964 

  1965     Use --verbose to print the parsed tree.

  1966     """

  1967     revs = None

  1968     if opts['rev']:

  1969         if repo is None:

  1970             raise error.RepoError(_('there is no Mercurial repository here '

  1971                                     '(.hg not found)'))

  1972         revs = scmutil.revrange(repo, opts['rev'])

  1973 

  1974     props = {}

  1975     for d in opts['define']:

  1976         try:

  1977             k, v = (e.strip() for e in d.split('=', 1))

  1978             if not k:

  1979                 raise ValueError

  1980             props[k] = v

  1981         except ValueError:

  1982             raise error.Abort(_('malformed keyword definition: %s') % d)

  1983 

  1984     if ui.verbose:

  1985         aliases = ui.configitems('templatealias')

  1986         tree = templater.parse(tmpl)

  1987         ui.note(templater.prettyformat(tree), '\n')

  1988         newtree = templater.expandaliases(tree, aliases)

  1989         if newtree != tree:

  1990             ui.note(("* expanded:\n"), templater.prettyformat(newtree), '\n')

  1991 

  1992     mapfile = None

  1993     if revs is None:

  1994         k = 'debugtemplate'

  1995         t = formatter.maketemplater(ui, k, tmpl)

  1996         ui.write(templater.stringify(t(k, **props)))

  1997     else:

  1998         displayer = cmdutil.changeset_templater(ui, repo, None, opts, tmpl,

  1999                                                 mapfile, buffered=False)

  2000         for r in revs:

  2001             displayer.show(repo[r], **props)

  2002         displayer.close()

  2003