Add option to ignore filetypes (#10)

* add beacon_ignore_filetypes
* update beacon.txt with beacon_ignore_filetypes

README.md

@@ -70,6 +70,12 @@ To ignore a buffer you can set list of regexes
 g:beacon_ignore_buffers = [\w*git*\w]
 ```
 
+### Ignoring filetypes
+To ignore filetypes you can set list of filetypes
+```viml
+g:beacon_ignore_filetypes = ['fzf']
+```
+
 ## Commands
 There is 4 commands available.
 - `:Beacon` highlight current position (even if plugin is disabled)

doc/beacon.txt

@@ -37,6 +37,10 @@ OPTIONS                                         *beacon-option*
         List of regexes that will be tested against buffer name, and if
         matches beacon will not show up. Default [].
 
+    g:beacon_ignore_filetypes                   *g:beacon_ignore_filetypes*
+        List of filetypes that will be tested against &filetype, and if
+        matches beacon will not show up. Default [].
+
 CHANGE COLOR                                    *hl-Beacon*
 
 Beacon is highlighted by `Beacon` group, so you can change it like this:

plugin/beacon.vim

@@ -38,6 +38,7 @@ let g:beacon_show_jumps = get(g:, 'beacon_show_jumps', 1)
 let g:beacon_shrink = get(g:, 'beacon_shrink', 1)
 let g:beacon_timeout = get(g:, 'beacon_timeout', 500)
 let g:beacon_ignore_buffers = get(g:, 'beacon_ignore_buffers', [])
+let g:beacon_ignore_filetypes = get(g:, 'beacon_ignore_filetypes', [])
 
 " buffer needed for floating window
 if has("nvim")
@@ -48,6 +49,17 @@ let s:float = 0 " floating win id
 let s:fade_timer = 0
 let s:close_timer = 0
 
+fun! s:IsIgnoreFiletype()
+    let name = &filetype
+
+    for i in g:beacon_ignore_filetypes
+        if name =~ i
+            return 1
+        endif
+    endfor
+    return 0
+endf
+
 fun! s:IsIgnoreBuffer()
     let name = bufname()
 
@@ -144,6 +156,10 @@ function! s:Highlight_position(force) abort
         return
     endif
 
+    if s:IsIgnoreFiletype()
+        return
+    endif
+
     " get some bugs when enabled in fugitive
     if has("nvim")
         if nvim_buf_get_option(0, "ft") == "fugitive"