First pass at ctags integration

ftplugin/elm/ctags/elm.cnf

@@ -0,0 +1,11 @@
+--langdef=Elm
+--langmap=Elm:.elm
+--regex-Elm=/^ *([a-z][a-zA-Z0-9_-]+)[ \t ]*:[^:].*->(.*)/\1/f,function,functions type declarations,S:String s/
+--regex-Elm=/^ *([a-z][a-zA-Z0-9_-]+)[ \t ]*:([^:][^-]+)$/\1/c,constant,constants/
+--regex-Elm=/^port *([a-z][a-zA-Z0-9_-]+)[ \t ]*:[^:]/\1/p,port,ports/
+--regex-Elm=/^type *([A-Z][a-zA-Z0-9_-]*)/\1/t,type/
+--regex-Elm=/^type alias *([A-Z][a-zA-Z0-9_-]*)/\1/t,type,Declared types/
+--regex-Elm=/[ \r\n\t][\|=][ \r\n\t]*([A-Z][a-zA-Z0-9_-]*)(.*)/\1/C,constructor,constructors created by types/
+--regex-Elm=/^module *([A-Z][.a-zA-Z0-9_-]*)/\1/m,module,module definitions/
+--regex-Elm=/^import *([A-Z][.a-zA-Z0-9_-]*)(.*as *([A-Z][.a-zA-Z0-9_-]*))?.*(\(.*\))*/\1 (\2)/i,import,imported modules/
+

ftplugin/elm/tagbar.vim

@@ -4,11 +4,34 @@ elseif globpath(&rtp, 'plugin/tagbar.vim') == ""
     finish
 endif
 
+if !exists("g:elm_ctags_config")
+	let g:elm_ctags_config = expand('<sfile>:p:h:h') . '/elm/ctags/elm.cnf'
+endif
+
+if !exists("g:elm_ctags_target_dirs")
+	let g:elm_ctags_target_dirs = './elm-stuff ./src'
+endif
+
+if !exists("g:elm_ctags_exe")
+	let g:elm_ctags_exe = 'ctags-exuberant'
+endif
+
+function! GenerateElmTags()
+    exec system(g:elm_ctags_exe . ' -R --fields=+l --options=' . g:elm_ctags_config . ' ' . g:elm_ctags_target_dirs)
+endfunction
+command! ElmGenerateTags call GenerateElmTags()
+
+let g:Plugin_install_dir = expand('<sfile>:p:h:h')
 function! s:SetTagbar()
     if !exists("g:tagbar_type_elm")
         let g:tagbar_type_elm = {
                     \ 'ctagstype' : 'elm',
+                    \ 'deffile' : g:elm_ctags_config,
                     \ 'kinds'     : [
+                    \ 'm:module',
+                    \ 'i:imports',
+                    \ 't:types',
+                    \ 'C:constructors',
                     \ 'c:constants',
                     \ 'f:functions',
                     \ 'p:ports'