- Move theme installation to cli entry point (omf.fish)
- Generalize XDG_CONFIG_HOME code in `omf.xdg.config_home`
- Generalize prompt conflicts check in `omf.checks.fish_prompt`
* Migrate `omf.doctor` to use it
+ Change theme activation steps
- Create user function path if not existent
- Check for conflicts in fish_prompt, aborts if found
- Remove current theme from autoloading paths
- Add target theme to autoloading paths
- Link target theme's fish_prompt to user's
- Persist selected theme to $OMF_CONFIG/theme
This approach brings two major advantages:
- Theme prompt now shows accordingly in fish_config web interface
- Faster theme changes, reducing it from seconds to some milis
- Avoids calling refresh, which makes users much more happy
In order to pro-actively diagnose an issue on someone's computer, a
`omf doctor' command is being added. This command will initially check
errors that could cause a theme to not be loaded, but in the future more
checks are going to be added to prevent issues from being created for
problems that are fixable by the Oh My Fish user alone.
