Re: function definition for only one file, not for other simultaneously opened files

I believe that as Gary hinted the best bet in this case is to inspect the file extension (".md" I guess) with the help of 

if matchstr(bufname(), '\.md$')

  " do something

endif

which should return a true value (the string '.md') if the extension matches and a false value otherwise. This might make the function a little more complicated, so that you may want to load it from an (autoload) file.

I actually have a small function which takes an extension (not a regex!) with or without a leading dot and a file name and returns true of false according to whether the extension is present on the filename or not.

" e.g. let bool =                  bpj#util#ext_is('md',              bufname())                       

fun! bpj#util#ext_is (ext,         filename) abort                  

    " prepend dot to ext if none   

  let wanted = substitute(a:       ext, '\v^[^\.]+$', '.&','')      

    " get ext incl dot from fn     

   let actual = matchstr(a:         filename, '\v\.[^\.]+$')         

   " return result of comparison     return actual ==# wanted        

 endfun

You may want to make that a case insensitive comparison (use `==?` instead of `==#`). I prefer not to. I can always pass the lowercased version of the file name if I want to ignore case.

--
Better --help|less than helpless

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