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" Author: w0rp <devw0rp@gmail.com>
" Description: This file handles guessing file extensions for filetypes, etc.
function! ale#filetypes#LoadExtensionMap() abort
" Output includes:
" '*.erl setf erlang'
let l:output = execute('exec "autocmd"')
let l:map = {}
for l:line in split(l:output, "\n")
" Parse filetypes, like so:
"
" *.erl setf erlang
" *.md set filetype=markdown
" *.snippet setlocal filetype=snippets
let l:match = matchlist(l:line, '\v^ *\*(\.[^ ]+).*set(f *| *filetype=|local *filetype=)([^ ]+)')
if !empty(l:match)
let l:map[substitute(l:match[3], '^=', '', '')] = l:match[1]
endif
endfor
return l:map
endfunction
let s:cached_map = {}
function! s:GetCachedExtensionMap() abort
if empty(s:cached_map)
let s:cached_map = ale#filetypes#LoadExtensionMap()
endif
return s:cached_map
endfunction
function! ale#filetypes#GuessExtension(filetype) abort
let l:map = s:GetCachedExtensionMap()
let l:ext = get(l:map, a:filetype, '')
" If we have an exact match, like something for javascript.jsx, use that.
if !empty(l:ext)
return l:ext
endif
" If we don't have an exact match, use the first filetype in the compound
" filetype.
for l:part in split(a:filetype, '\.')
let l:ext = get(l:map, l:part, '')
if !empty(l:ext)
return l:ext
endif
endfor
" Return an empty string if we don't find anything.
return ''
endfunction
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