[PATCH 3 of 3] template: add extrakeys (dict) keyword to templater

[Augie Fackler]

On Thu, Nov 21, 2013 at 04:04:25PM -0500, Matthew Turk wrote:
> # HG changeset patch
> # User Matthew Turk <matthewturk at gmail.com>
> # Date 1385067325 18000
> #      Thu Nov 21 15:55:25 2013 -0500
> # Node ID 3d7f6e0ad51047f4eacf68abcba12dcaecb0081b
> # Parent  547837e59d439af3c907931ca65cab911d00dfe3
> template: add extrakeys (dict) keyword to templater
>
> This returns the 'extras' dictionary to the templater.  It enables utilization
> of templates such as:
>
> hg log -r 0 --template "{get(extras, 'convert_revision')}\n"

I'm confused. Is there some magic in the templater that causes the
get() call to use extrakeys?

>
> where 'convert_revision' is the key in the 'extras' dictionary.  This should
> allow for subsequent template styles to be written that perform meaningful
> queries on the extras dict, for use in things like repository conversions,
> additional metadata and so on.
>
> For example, in my primary project repository, extras contains amend_source,
> branch, close, convert_revision, rebase_source, source, transplant_source.
>
> diff -r 547837e59d43 -r 3d7f6e0ad510 mercurial/templatekw.py
> --- a/mercurial/templatekw.py	Thu Nov 21 15:47:26 2013 -0500
> +++ b/mercurial/templatekw.py	Thu Nov 21 15:55:25 2013 -0500
> @@ -226,6 +226,10 @@
>      f = _showlist('extra', c, plural='extras', **args)
>      return _hybrid(f, c, lambda x: '%s=%s' % (x['key'], x['value']))
>
> +def showextrakeys(**args):
> +    """:extrakeys: The 'extras' attribute as a dict."""
> +    return args['ctx'].extra()
> +
>  def showfileadds(**args):
>      """:file_adds: List of strings. Files added by this changeset."""
>      repo, ctx, revcache = args['repo'], args['ctx'], args['revcache']
> @@ -362,6 +366,7 @@
>      'desc': showdescription,
>      'diffstat': showdiffstat,
>      'extras': showextras,
> +    'extrakeys': showextrakeys,
>      'file_adds': showfileadds,
>      'file_copies': showfilecopies,
>      'file_copies_switch': showfilecopiesswitch,
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