[PATCH 1 of 4] ui: add a function to read configuration related to devel warning

[Yuya Nishihara]

On Tue, 10 Mar 2015 21:56:47 -0700, Pierre-Yves David wrote:
> # HG changeset patch
> # User Pierre-Yves David <pierre-yves.david at fb.com>
> # Date 1426047011 25200
> #      Tue Mar 10 21:10:11 2015 -0700
> # Node ID e9e42adc21a5c0a9bd68079bdd209b7a086ad046
> # Parent  4ef4e3c3c00693868ba428e21ac092e559e4fcea
> ui: add a function to read configuration related to devel warning
> 
> We are about to introduce a class of configuration that will enable various
> warnings targeted to developers. As we want both a wide and fine way to control
> them, we introduce a special method to know if a warning of a given category
> should be displayed or not.
> 
> First user will be introduced in the next changeset.
> 
> diff --git a/mercurial/ui.py b/mercurial/ui.py
> --- a/mercurial/ui.py
> +++ b/mercurial/ui.py
> @@ -921,5 +921,11 @@ class ui(object):
>  
>          ui.write(s, 'label') is equivalent to
>          ui.write(ui.label(s, 'label')).
>          '''
>          return msg
> +
> +    def develflag(self, flag):
> +        """check if a devel warning is requested for flag X
> +
> +        We do not just "config" because we want to support a 'all' value"""
> +        return self.config('devel', 'all') or self.config('devel', flag)

should be configbool() ?