https://bz.mercurial-scm.org/show_bug.cgi?id=6640
Bug ID: 6640
Summary: Color mode autodetection incorrect for modern
Cygwin/MSYS2 + Command Prompt
Product: Mercurial
Version: stable branch
Hardware: PC
OS: Windows
Status: UNCONFIRMED
Severity: feature
Priority: wish
Component: color
Assignee: bugzi...@mercurial-scm.org
Reporter: mhent...@mozilla.com
CC: mercurial-devel@mercurial-scm.org
Python Version: ---
(I'm guessing) that, when running on Windows, the color mode should be:
* "win32" if the terminal is Command Prompt (and perhaps Windows Terminal)
* "ansi" if the terminal is TTY-based, like Mintty, Conemu, etc.
The current Windows color mode detection does this by checking $TERM [1].
This used to work because older Cygwin/MSYS used `TERM=cygwin`.
However, modern Cygwin/MSYS2 uses `TERM=xterm-256color` in the Command Prompt
(and just `TERM=xterm` in Mintty).
This causes issues where colored output is mis-formatted.
You can reproduce this by:
1. Install Python 3
2. `py -m pip install mercurial --user`
3. Create a repo and put a changed file in it, do an `hg addremove`
4. Install MSYS2 [2]
5. Start a Command Prompt
6. `C:\msys64\msys2_shell.cmd -no-start -defterm`
7. `cd <path to repo you created`
8. `C:\Users\<User>\AppData\Roaming\Python\Python<version>\Scripts\hg.exe
commit -m "message"`
The "no username supplied" error should have raw ansi sequences on either side
of it.
I'm not sure what the solution is here. You can look for the `$TERM_PROGRAM`
environment variable, but that's not standardized. My Windows-foo is not
sufficiently advanced to have a straightforward recommendation :)
There is a workaround for others affected by this: set the "color.mode" option
to "win32".
[1] https://www.mercurial-scm.org/repo/hg/file/tip/mercurial/color.py#l258
[2] https://www.msys2.org/
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