Support negative patterns in g:rooter_targets

Author: intelfx

README.mkd

@@ -40,6 +40,13 @@ let g:rooter_targets = ['/', '*']
 let g:rooter_targets = ['/', '/home/*']
 ```
 
+Patterns are tried in order until one of them matches. To specify a negative pattern, prefix it with a `!`. If no patterns match, Rooter is not triggered:
+
+```viml
+" Everything (default), except files under /tmp
+let g:rooter_targets = ['!/tmp/*', '/', '*']
+```
+
 Comma-separated lists are also accepted:
 
 ```viml

doc/rooter.txt

@@ -60,6 +60,11 @@ Rooter. Use a literal `/` to match directory buffers. For example:
 >
     let g:rooter_targets = ['/', '/home/*']
 <
+Patterns are tried in order until one of them matches. To specify a negative
+pattern, prefix it with a `!`. If no patterns match, Rooter is not triggered:
+>
+    let g:rooter_targets = ['!/tmp/*', '/', '*']
+<
 A comma-separated list is also accepted instead of a native list:
 >
     let g:rooter_targets = '/,*.rb,*.haml,*.js'

plugin/rooter.vim

@@ -119,8 +119,13 @@ function! s:activate()
   if !exists('*glob2regpat') | return 1 | endif
 
   for p in filter(copy(patterns), 'v:val != "/"')
+    if p[0] == '!'
+      let [p, verdict] = [p[1:], 0]
+    else
+      let [p, verdict] = [p, 1]
+    endif
     if fn =~ glob2regpat(p)
-      return 1
+      return verdict
     endif
   endfor