How to escape the dollar sign?

[yuis-ice]

Here's an example tmuxp yaml config part:

    panes:
      - shell_command:
        - autossh -t -p 30360 tmp@localhost 'PATH=~/.nvm/versions/node/v20.16.0/bin:$PATH && cd pg && npx local-web-server -p 30361'

The problem is simply, the $PATH part expands on the tmux session (what I do not desire and expect) which breaks the command, so I need to disable the feature (?) or safely escape such character(s).

[joseph-flinn]

It seems like the expansion of all environment variables comes from this line:

tmuxp/src/tmuxp/workspace/loader.py

Line 26 in ef6b32a

return os.path.expandvars(os.path.expanduser(value)) # NOQA: PTH111

It doesn't look like there is currently a way to escape the dollar sign. I'll have to look further into the different cases where environment variables should and should not be expanded before proposing a solution.

Debugging notes to future self

• Manually running :send-keys "echo '$PATH'" Enter in tmux expands $PATH
• Manually running :send-keys 'echo "$PATH"' Enter in tmux does not expand $PATH
• pane.send_keys("PATH=$PATH") works as expected (does not expand in pane)
  • Can quickly be tested tmuxp shell
  • Implies that libtmux.pane.cmd() works as expected
  • Implies that libtmux.server.cmd() works as expected
• The issue has to be with how the command is loaded from the config
• Found it: tmuxp.workspace.loader.expandshell() defaults to expanding all $ and ${} with the user's local environment