Split file detecation function

autoload/requirements.vim

@@ -0,0 +1,31 @@
+" the Requirements File Format syntax support for Vim
+" Version: 0.1
+" Author:  raimon <raimon49@hotmail.com>
+" License: MIT LICENSE
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+if !exists('g:requirements#detect_filename_pattern')
+    let g:requirements#detect_filename_pattern = ''
+endif
+
+
+function! requirements#matched_filename(filename)
+    if a:filename =~# '\v.*require(ment)?s\.(txt|in)'
+        return 1
+    endif
+
+    if a:filename =~# '\v.require(ment)?s/.*\.(txt|in)'
+        return 1
+    endif
+
+    if len(g:requirements#detect_filename_pattern)
+        \ && a:filename =~# g:requirements#detect_filename_pattern
+        return 1
+    endif
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+" vim: et sw=4 ts=4 sts=4:

ftdetect/requirements.vim

@@ -6,15 +6,7 @@
 function! s:isRequirementsFile()
     let l:filename = expand("%:p")
 
-    if l:filename =~# '\v.*require(ment)?s\.(txt|in)'
-        return 1
-    endif
-
-    if l:filename =~# '\v.require(ment)?s/.*\.(txt|in)'
-        return 1
-    endif
-
-    return 0
+    return requirements#matched_filename(l:filename)
 endfunction
 
 au BufNewFile,BufRead *.{txt,in} if s:isRequirementsFile() | set ft=requirements

plugin/requirements.vim

@@ -0,0 +1,16 @@
+" the Requirements File Format syntax support for Vim
+" Version: 0.1
+" Author:  raimon <raimon49@hotmail.com>
+" License: MIT LICENSE
+
+if exists('g:loaded_requirements')
+    finish
+endif
+let g:loaded_requirements = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+" vim: et sw=4 ts=4 sts=4: