Add option to automatically update tags when a buffer is saved

README.md

@@ -62,6 +62,30 @@ Or within Vim by executing the following command:
 Note that for the latter command, the current working directory will be used
 (`:help pwd` to find out more).
 
+### Options
+
+#### `g:erlang_tags_ignore`
+
+Add ignore path for tags generation. Use a string or list of strings like:
+
+    let g:erlang_tags_ignore = 'rel'
+    let g:erlang_tags_ignore = ['rel']
+
+Default: doesn't exist.
+
+#### `g:erlang_tags_auto_update`
+
+If exists and set to 1, this plugin will be triggered when an Erlang buffer is
+written. Warning: this may cost lots of CPU if you have a large project. Note
+that it might not work on Windows.
+
+Default: doesn't exist.
+
+#### `g:erlang_tags_outfile`
+
+This option specifies the name of the generated tags file. By default, the
+output file will be `./tags`.
+
 ### Automating generating tags
 
 To keep the tags file up-to-date you can re-run these commands periodically, or

plugin/vim-erlang-tags.vim

@@ -23,7 +23,7 @@ autocmd FileType erlang call VimErlangTagsDefineMappings()
 
 let s:exec_script = expand('<sfile>:p:h') . "/../bin/vim-erlang-tags.erl"
 
-function! VimErlangTags()
+function! s:GetExecuteCmd()
     let script_opts = ""
 
     if exists("g:erlang_tags_ignore")
@@ -39,17 +39,31 @@ function! VimErlangTags()
     if exists("g:erlang_tags_outfile") && g:erlang_tags_outfile != ""
         let script_opts = script_opts . " --output " . g:erlang_tags_outfile
     endif
+    return s:exec_script . script_opts
+endfunction
+
+function! VimErlangTags()
+    let exec_cmd = s:GetExecuteCmd()
 
-    let script_output = system(s:exec_script . script_opts)
+    let script_output = system(exec_cmd)
     if !v:shell_error
         return 0
     else
         echoerr "vim-erlang-tag " . script_output
     endif
 endfunction
 
+function! AsyncVimErlangTags()
+    let exec_cmd = s:GetExecuteCmd()
+    call system(exec_cmd . '&')
+endfunction
+
 command! ErlangTags call VimErlangTags()
 
+if exists("g:erlang_tags_auto_update") && g:erlang_tags_auto_update == 1
+    au BufWritePost *.erl,*.hrl call AsyncVimErlangTags()
+endif
+
 function! VimErlangTagsSelect(split)
     if a:split
         split