templater: replace templatepath() with function that also opens the file For frozen binaries, such as those created by PyOxidizer, I plan to make it so the templatespec can keep an opened file/resource to read from instead of needing a file path. Having `templatepath()` return an opened file should help with that. At this point, it's just a wasteful extra opening of mapfiles that we'll open again later. I'll update the read-side next so it reads from the file-like object without opening the file again. Differential Revision: https://phab.mercurial-scm.org/D8892

--- a/mercurial/debugcommands.py	Thu Jul 30 13:44:06 2020 -0700
+++ b/mercurial/debugcommands.py	Tue Aug 04 13:21:29 2020 -0700
@@ -1672,7 +1672,7 @@
     fm.write(b'templatedirs', b'checking templates (%s)...\n', p or b'')
     fm.condwrite(not p, b'', _(b" no template directories found\n"))
     if p:
-        m = templater.templatepath(b"map-cmdline.default")
+        (m, fp) = templater.open_template(b"map-cmdline.default")
         if m:
             # template found, check if it is working
             err = None