Support for fish

[bugabinga]

Changed the function _fresh_preamble as discussed in #125 . Same logic as before, but in fish syntax.

Currently the function works exclusively for either bash/zsh or fish, depending on the users default shell.
If the user changes his/her default shell, the function would need to be re-run. Is this a problem? I am not sure at what times the function is called exactly.

[jasoncodes]

getent is not available on Mac OS X. Would it be possible to detect fish via the presence of an environment variable?

[bugabinga]

Would using the $SHELL variable be more portable?

[jasoncodes]

$SHELL should be fine.

[jasoncodes]

Ideally, a single preamble would be emitted which runs on both bash/zsh and fish. From a few minutes of research, I don’t see a way to do this though.

[bugabinga]

How would you like to proceed? There is no way for a unified preamble as far as I can tell.

[jasoncodes]

I would prefer to just have a way to disable the preamble completely. Perhaps expand FRESH_NO_PATH_EXPORT also suppress the FRESH_PATH export?

[bugabinga]

Ok, I will try that. _fresh_preamble gets called twice during fresh_install. Once because of _run_dsl install and once called directly. Is this intentional?

[jasoncodes]

This is intentional. The call in _dsl_install_fresh is to ensure the preamble is outputted before the first sourced shell content. The second call in fresh_install is to ensure the preamble is outputted with an empty freshrc file.