view .hgtags @ 19932:e3a5922e18c3

demandimport: support "absolute_import" for external libraries (issue4029)

Before this patch, demandimport of Mercurial may fail to load external
libraries using "from __future__ import absolute_import": for example,
importing "foo" in "bar.baz" module will load "bar.foo" if it exists,
even though "absolute_import" is enabled in "bar.baz" module.

So, extensions for Mercurial can't use such external libraries.

This patch saves "level" of import request for on-demand module
loading in the future: default value of level is -1, and level is 0
when "absolute_import" is enabled.

"level" value is passed to built-in import function in
"_demandmod._load()" and it should load target module correctly.

This patch changes only one "_demandmod" construction case other than
cases below:

    - construction in "_demandmod._load()"

      this code path should be used only in relative sub-module
      loading case

    - constructions other than patched one in"_demandimport()"

      these code paths shouldn't be used in "level != -1" case

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