[PATCH 1 of 4 V2 mergedriver] mergestate: add a constructor that sets up a fresh merge state

[timeless]

I know this is on clowncopter, but do you really want the first line of the
commit message to use "fresh" instead of "clean"?
On Nov 17, 2015 8:14 PM, "Siddharth Agarwal" <sid0 at fb.com> wrote:

> # HG changeset patch
> # User Siddharth Agarwal <sid0 at fb.com>
> # Date 1447808454 28800
> #      Tue Nov 17 17:00:54 2015 -0800
> # Node ID 681b710bd541703659aec3ac3c9a5b7b0d6e9493
> # Parent  a879917dec18a4621476c8af18724f5d5696c663
> mergestate: add a constructor that sets up a fresh merge state
>
> Eventually, we'll move the read call out of the constructor. This will:
> - avoid unnecessary reads when we're going to nuke the merge state anyway
> - avoid raising an exception if there's an unsupported merge record
>
> 'clean' seems like a good name for it because I wanted to avoid anything
> with
> the word 'new' in it, and 'reset' is more an action performed on a merge
> state
> than a way to get a new merge state.
>
> Thanks to Martin von Zweigbergk for feedback about naming this.
>
> diff --git a/mercurial/merge.py b/mercurial/merge.py
> --- a/mercurial/merge.py
> +++ b/mercurial/merge.py
> @@ -75,6 +75,14 @@ class mergestate(object):
>      statepathv1 = 'merge/state'
>      statepathv2 = 'merge/state2'
>
> +    @staticmethod
> +    def clean(repo, node=None, other=None):
> +        """Initialize a brand new merge state, removing any existing
> state on
> +        disk."""
> +        ms = mergestate(repo)
> +        ms.reset(node, other)
> +        return ms
> +
>      def __init__(self, repo):
>          self._repo = repo
>          self._dirty = False
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