*Issue #1425 <https://github.com/leo-editor/leo-editor/issues/1425>.
Settings > Open A Theme File can look like it's not working. The Leo
session that spawns the Leo-with-themefile locks and says "Not Responding"
in the title bar until the Leo-with-themefile session is closed. Read the
issue for more context. This is an ENB as I work towards resolution,*
...
As currently written this menu command, defined in
../commands/commanderFileCommands.py-->Themes-->c_file.open_theme_file,
will only work in Leo source code checkouts. That is, it's broken for
anyone who installs from Pypi.org, from pip in a non-editable mode, or some
other deployment mode that works similarly.
The problem part:
command = f'python launchLeo.py "{fn}"'
os.system(command)
launchLeo.py doesn't exist outside a source code repo. In a pip deployment
Leo is launched with PYTHONHOME/Scripts/leo. Others use their own launch
wrapper somewhere else.
A few different fixes suggest themselves:
1. search PATH for leo
2. ask current Leo session what it's launch command is/was
3. reproduce the contents of launchLeo.py as a python -c '...{py
code}...' command line expression. (It's short enough that this is
practical)
I don't like 1 & 3 much. I do like 2 but don't know yet how much work it
will be. Well, time to start learning!
Along the way, we might as well replace os.command with a current
recommended
<https://docs.python.org/3.6/library/subprocess.html#replacing-os-system>
method as
*"The subprocess
<https://docs.python.org/3.6/library/subprocess.html#module-subprocess>
module provides more powerful facilities for spawning new processes and
retrieving their results; using that module is preferable to using this
function. See the Replacing Older Functions with the subprocess Module
<https://docs.python.org/3.6/library/subprocess.html#subprocess-replacements>
section in the subprocess
<https://docs.python.org/3.6/library/subprocess.html#module-subprocess>
documentation for some helpful recipes." (ref
<https://docs.python.org/3.6/library/os.html#os.system>)*
-matt
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