Option to disable modification of the user's prompt.

[literatesnow]

Summary

Devbox prefixes the user's prompt (PS1) with (devbox) when inside the devbox shell. Unfortunately, this doesn't look great with prompts which have been customized (with starship for example).

Disable prompt modification by setting either DEVBOX_NO_PROMPT or devbox_no_prompt (fish) in your shell. Now the user can detect devbox and display it on their PS1 using the method if their choosing.

Fixes #845.

How was it tested?

bash and zsh

I ran the command in these shells with export DEVBOX_NO_PROMPT=true and without the variable (unset DEVBOX_NO_PROMPT) and observed the results.

if [ -z "$DEVBOX_NO_PROMPT" ]; then
  export PS1="(devbox) $PS1"
fi

fish

Disclaimer, I'm not a fish user. I installed fish and read the documentation.

I added set devbox_no_prompt true to my .config/fish/config.fish, then removed it and observed the results.

if not set -q devbox_no_prompt
    functions -c fish_prompt __devbox_fish_prompt_orig
    function fish_prompt
        echo "(devbox)" (__devbox_fish_prompt_orig)
    end
end

[savil]

@literatesnow thanks for submitting this PR! The proposal LGTM. Would you mind updating the two shellrc.golden files at:

• internal/devbox/testdata/shellrc/basic/shellrc.golden
• internal/devbox/testdata/shellrc/noshellrc/shellrc.golden
  ?

That should enable the CICD tests to pass

[literatesnow]

@literatesnow thanks for submitting this PR! The proposal LGTM. Would you mind updating the two shellrc.golden files at:

* `internal/devbox/testdata/shellrc/basic/shellrc.golden`

* `internal/devbox/testdata/shellrc/noshellrc/shellrc.golden`
  ?

That should enable the CICD tests to pass

Done, thanks for pointing out the files.

[literatesnow]

Thank you @savil !

[axkirillov]

Thank you!

[savil]

oh thank you @literatesnow !