[PATCH 1 of 5] extdata: add extdatasource reader

[Mathias De Maré]

On Thu, Sep 22, 2016 at 8:21 PM, Matt Mackall <mpm at selenic.com> wrote:

> # HG changeset patch
> # User Matt Mackall <mpm at selenic.com>
> # Date 1473794045 18000
> #      Tue Sep 13 14:14:05 2016 -0500
> # Node ID 19bf2776dfe39befdc479253e1e7d030b41c08f9
> # Parent  5271ae66615207f39cc41d78f4541bc6f8ca6ff6
> extdata: add extdatasource reader
>
> This adds basic support for extdata, a way to add external data
> sources for revsets and templates. An extdata data source is simply a
> list of lines of the form:
>
> <revision identifier>[<space><freeform text>]\n
>
> An extdata source is configured thusly:
>
> [extdata]
> name = <a url or path>
>
> urls of the form shell: are launch shell commands to generate data.
>

This looks great!
We've been using a small extension to load an external file with tags into
one of our repositories. Do you think that could fit here as well?

Something like this would be nice:
[extdata]
name = <a url or path>
name.type = tags
name.checkrev = <revisions that should be present in the repository before
loading the tags>
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