Add loader object to autoload available matchers on demand

Author: vitalk

autoload/fancy.vim

@@ -175,13 +175,51 @@ call s:add_methods('matcher', [
       \ 'search_forward', 'search_backward'
       \ ])
 
+" }}}
+" Loader prototype {{{
+
+let s:loader_prototype = {}
+
+fun! s:loader() abort
+  let loader = {
+        \ 'filetypes': {}
+        \ }
+  call extend(loader, s:loader_prototype, 'keep')
+  return loader
+endf
+
+fun! s:loader_load(ft) dict abort
+  return self.filetypes[a:ft]
+endf
+
+fun! s:loader_save(ft, list) dict abort
+  let self.filetypes[a:ft] = a:list
+endf
+
+fun! s:loader_is_cached(ft) dict abort
+  return has_key(self.filetypes, a:ft)
+endf
+
+fun! s:loader_load_by_filetype(ft) dict abort
+  if self.is_cached(a:ft)
+    return self.load(a:ft)
+  else
+    let matchers = fancy#ft#{a:ft}#matchers()
+    call self.save(a:ft, matchers)
+    return matchers
+endf
+
+call s:add_methods('loader', [
+      \ 'load', 'save', 'is_cached', 'load_by_filetype'
+      \ ])
+
 " }}}
 " Fancy prototype {{{
 
 let s:fancy_prototype = {}
 
 fun! s:fancy() abort
-  let matchers = s:get_filetype_matchers(&filetype)
+  let matchers = s:loader().load_by_filetype(&filetype)
   if empty(matchers)
     call s:error(printf('%s: no available matcher', &filetype))
     return
@@ -246,7 +284,7 @@ fun! s:lookup_fancy(id)
   return found[0]
 endf
 
-fun! s:get_filetype_matchers(ft)
+fun! s:matchers_by_filetype(ft)
   if has_key(g:fancy_filetypes, a:ft)
     return g:fancy_filetypes[a:ft]
   endif

autoload/fancy/ft/markdown.vim

@@ -0,0 +1,53 @@
+" Language: Markdown
+" Author: Vital Kudzelka
+" License: MIT
+
+fun! fancy#ft#markdown#matchers()
+  " Github Flavored Markdown {{{
+
+  let github_flavored_markdown = fancy#matcher()
+
+  fun! github_flavored_markdown.start_line(...) dict abort
+    return self.search_backward('^\(\s\+\)\?```\w\+$')
+  endf
+
+  fun! github_flavored_markdown.end_line(indent, ...) dict abort
+    return self.search_forward('^\(\s\{'.a:indent.'\}\)\?```$')
+  endf
+
+  fun! github_flavored_markdown.filetype(fancy) dict abort
+    let text = join(a:fancy.buffer.read(
+          \ a:fancy.matcher.start_at,
+          \ a:fancy.matcher.start_at),
+          \ '\n')
+    return substitute(text, '\(\s\+\)\?```', '', '')
+  endf
+
+  " }}}
+  " Bitbucket {{{
+
+  let bitbucket_markdown = fancy#matcher()
+
+  fun! bitbucket_markdown.start_line(...) dict abort
+    return self.search_backward('\(```\n\)\@<=\#!\w\+$')
+  endf
+
+  fun! bitbucket_markdown.end_line(...) dict abort
+    return self.search_forward('^```$')
+  endf
+
+  fun! bitbucket_markdown.filetype(fancy) dict abort
+    let text = join(a:fancy.buffer.read(
+          \ a:fancy.matcher.start_at,
+          \ a:fancy.matcher.start_at),
+          \ '\n')
+    return substitute(text, '\#!', '', '')
+  endf
+
+  " }}}
+
+  return [
+        \ bitbucket_markdown,
+        \ github_flavored_markdown,
+        \ ]
+endf

plugin/fancy.vim

@@ -24,51 +24,3 @@ augroup fancy_markdown
 augroup END
 
 " }}}
-" Configuration {{{
-
-let github_flavored_markdown = fancy#matcher()
-
-fun! github_flavored_markdown.start_line(...) dict abort
-  return self.search_backward('^\(\s\+\)\?```\w\+$')
-endf
-
-fun! github_flavored_markdown.end_line(indent, ...) dict abort
-  return self.search_forward('^\(\s\{'.a:indent.'\}\)\?```$')
-endf
-
-fun! github_flavored_markdown.filetype(fancy) dict abort
-  let text = join(a:fancy.buffer.read(
-        \ a:fancy.matcher.start_at,
-        \ a:fancy.matcher.start_at),
-        \ '\n')
-  return substitute(text, '\(\s\+\)\?```', '', '')
-endf
-
-
-let bitbucket_markdown = fancy#matcher()
-
-fun! bitbucket_markdown.start_line(...) dict abort
-  return self.search_backward('\(```\n\)\@<=\#!\w\+$')
-endf
-
-fun! bitbucket_markdown.end_line(...) dict abort
-  return self.search_forward('^```$')
-endf
-
-fun! bitbucket_markdown.filetype(fancy) dict abort
-  let text = join(a:fancy.buffer.read(
-        \ a:fancy.matcher.start_at,
-        \ a:fancy.matcher.start_at),
-        \ '\n')
-  return substitute(text, '\#!', '', '')
-endf
-
-let filetypes = {}
-let filetypes.markdown = [
-      \ bitbucket_markdown,
-      \ github_flavored_markdown,
-      \ ]
-
-let g:fancy_filetypes = get(g:, 'fancy_filetypes', filetypes)
-
-" }}}