On Thu, 22 Sep 2016 13:21:35 -0500, Matt Mackall wrote:
> # HG changeset patch
> # User Matt Mackall <m...@selenic.com>
> # Date 1473794045 18000
> # Tue Sep 13 14:14:05 2016 -0500
> # Node ID 19bf2776dfe39befdc479253e1e7d030b41c08f9
> # Parent 5271ae66615207f39cc41d78f4541bc6f8ca6ff6
> extdata: add extdatasource reader
> +def extdatasource(repo, source):
> + """gather a map of rev -> value dict from the specified source
> +
> + A source spec is treated as a URL, with a special case shell: type
> + for parsing the output from a shell command.
> +
> + The data is parsed as a series of newline-separated records where
> + each record is a revision specifier optionally followed by a space
> + and a freeform string value. If the revision is known locally, it
> + is converted to a rev, otherwise the record is skipped.
> +
> + Note that both key and value are treated as UTF-8 and converted to
> + the local encoding. This allows uniformity between local and
> + remote data sources.
> + """
> +
> + spec = repo.ui.config("extdata", source)
> + if not spec:
> + raise util.Abourt(_("unknown extdata source '%s'") % source)
> +
> + try:
> + # prepare for future expansion
> + expand = spec % ()
> + except TypeError:
> + raise error.Abort(_("extdata doesn't support parameters yet"),
> + hint=_("use double % for escaping"))
Using '%' as a parameter symbol would be a bit unfortunate since URLs have
%HEX-escape syntax. How about using '$' or '{...}' ?
> + if spec.startswith("shell:"):
> + # external commands should be run relative to the repo root
> + cmd = spec[6:]
> + cwd = os.getcwd()
> + os.chdir(repo.root)
> + try:
> + src = util.popen(cmd)
> + finally:
> + os.chdir(cwd)
Temporary chdir() may cause problems in hgweb, which can be threaded.
> + else:
> + # treat as a URL or file
> + src = url.open(repo.ui, spec)
> +
> + try:
> + for l in src.readlines():
> + if " " in l:
> + k, v = l.strip().split(" ", 1)
> + else:
> + k, v = l.strip(), ""
> +
> + k = encoding.tolocal(k)
> + if k in repo:
If k is an ambiguous short hash, 'k in repo' would raise LookupError.
> + # we ignore data for nodes that don't exist locally
> + data[repo[k].rev()] = encoding.tolocal(v)
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