Any way to configure where Alternate file looks?

[rsanheim]

I have projects where I have a fast_spec/ directory in addition to spec/ -- is there a way to have Alternate file look in fast_spec first for alternate files? I didn't see anywhere to easily configure how it searches through unit, spec, etc, but my vimscript knowledge is poor.

[tpope]

I wouldn't call it easy, but you can set b:rails_alternate from a rails.vim autocommand (:help rails-autocommands) to an arbitrary file and :A will respect it. Completely untested:

autocmd User Rails/app/**/*.rb let b:rails_alternate = 'fast_spec/' . rails#buffer().name()[4:-4] . '_spec.rb'

That's an all-or-nothing example; if you want it to fall back to the default, you'll want a filereadable() check in there. I'll leave that as an exercise to the reader.

[henrik]

Nice. Just did this:

" lib/foo.rb -> unit/lib/foo_spec.rb
autocmd User Rails/lib/* let b:rails_alternate = 'unit/' . rails#buffer().name()[0:-4] . '_spec.rb'
" unit/lib/foo_spec.rb -> lib/foo.rb
autocmd User Rails/unit/lib/* let b:rails_alternate = rails#buffer().name()[5:-9] . '.rb'

[henrik]

Here is an example of filereadable fallbacks:

" :A on engines/foo/bar.rb -> {spec,unit}/engines/foo/bar_spec.rb
autocmd User Rails/engines/* let common = rails#buffer().name()[0:-4].'_spec.rb' | let spec = 'spec/'.common | let unit = 'unit/'.common | let b:rails_alternate = filereadable(spec) ? spec : unit

[tpope]

The recently added "classifications" feature provides a more declarative way to do this at the same time as creating a navigation command.

[henrik]

Oh yes, someone pointed me to that. Haven't tried yet but probably will. Thanks!