windows: disable pager when packaged with py2exe
With Windows and py3, all output that got directed to the pager was lost. It
can be worked around by the user piping to `more`, but that's easy to forget,
and can be dangerous if `hg diff` or similar incorrectly shows no changes. The
problem appears to be the new WindowsConsoleIO in py3.6[1]. We've worked around
it with PyOxidizer by setting the `Py_LegacyWindowsStdioFlag` interpreter
option, and worked around it with `hg.bat` and `exewrapper.c` by internally
setting `PYTHONLEGACYWINDOWSSTDIO=1`.
Unfortunately, py2exe doesn't appear to be able to set the interpreter option,
and somehow seems to also ignore the environment variable. The latter isn't a
good fix anyway, since setting it in the environment would affect other python
programs too. We can't install a global config for this because a config closer
to the user (e.g. from before pager was turned on by default) can override it.
[1] https://peps.python.org/pep-0528/
Differential Revision: https://phab.mercurial-scm.org/D12556
--- a/mercurial/ui.py Wed Apr 13 14:37:57 2022 -0400
+++ b/mercurial/ui.py Wed Apr 13 15:02:01 2022 -0400
@@ -1432,6 +1432,14 @@
# HGPLAINEXCEPT=pager, and the user didn't specify --debug.
return
+ # py2exe doesn't appear to be able to use legacy I/O, and nothing is
+ # output to the pager for paged commands. Piping to `more` in cmd.exe
+ # works, but is easy to forget. Just disable pager for py2exe, but
+ # leave it working for pyoxidizer and exewrapper builds.
+ if pycompat.iswindows and getattr(sys, "frozen", None) == "console_exe":
+ self.debug(b"pager is unavailable with py2exe packaging\n")
+ return
+
pagercmd = self.config(b'pager', b'pager', rcutil.fallbackpager)
if not pagercmd:
return