[PATCH] formatter: add context manager interface for convenience

Augie Fackler raf at durin42.com
Tue Aug 30 17:23:34 EDT 2016


On Wed, Aug 31, 2016 at 12:05:58AM +0900, Yuya Nishihara wrote:
> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1472396405 -32400
> #      Mon Aug 29 00:00:05 2016 +0900
> # Node ID 41fea255bd1cda8d0f482b2582aec8a29f86c303
> # Parent  90af59b40d8a007fb8811daf0c3e64aca43aa6b0
> formatter: add context manager interface for convenience

Nice, queued.

>
> And port "hg files" to test it.
>
> As you can see, extra indent is necessary to port to this API. I don't think
> we should switch every fm.formatter() call to "with" statement.

Agreed, but for simple cases it's a nice readability and correctness win.

>
> diff --git a/mercurial/commands.py b/mercurial/commands.py
> --- a/mercurial/commands.py
> +++ b/mercurial/commands.py
> @@ -3963,15 +3963,11 @@ def files(ui, repo, *pats, **opts):
>      end = '\n'
>      if opts.get('print0'):
>          end = '\0'
> -    fm = ui.formatter('files', opts)
>      fmt = '%s' + end
>
>      m = scmutil.match(ctx, pats, opts)
> -    ret = cmdutil.files(ui, ctx, m, fm, fmt, opts.get('subrepos'))
> -
> -    fm.end()
> -
> -    return ret
> +    with ui.formatter('files', opts) as fm:
> +        return cmdutil.files(ui, ctx, m, fm, fmt, opts.get('subrepos'))
>
>  @command('^forget', walkopts, _('[OPTION]... FILE...'), inferrepo=True)
>  def forget(ui, repo, *pats, **opts):
> diff --git a/mercurial/formatter.py b/mercurial/formatter.py
> --- a/mercurial/formatter.py
> +++ b/mercurial/formatter.py
> @@ -52,6 +52,11 @@ class baseformatter(object):
>          self._item = None
>          # function to convert node to string suitable for this output
>          self.hexfunc = hex
> +    def __enter__(self):
> +        return self
> +    def __exit__(self, exctype, excvalue, traceback):
> +        if exctype is None:
> +            self.end()
>      def __nonzero__(self):
>          '''return False if we're not doing real templating so we can
>          skip extra work'''
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