From 4dd84d7165e40f6014226dca0810562888ee9c48 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Tue, 29 Sep 2015 22:35:58 +0900
Subject: [PATCH] [BTags] Try --language-force option the first time

---
 autoload/fzf/vim.vim | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/autoload/fzf/vim.vim b/autoload/fzf/vim.vim
index 5e2c6f8..af78a89 100644
--- a/autoload/fzf/vim.vim
+++ b/autoload/fzf/vim.vim
@@ -379,11 +379,22 @@ endfunction
 " BTags
 " ------------------------------------------------------------------
 function! s:btags_source()
-  let lines = map(split(system(printf(
-    \ 'ctags -f - --sort=no --excmd=number %s',
-    \ expand('%:S'))), "\n"), 'split(v:val, "\t")')
+  if !filereadable(expand('%'))
+    throw 'Save the file first'
+  endif
+
+  for cmd in [
+    \ printf('ctags -f - --sort=no --excmd=number --language-force=%s %s', &filetype, expand('%:S')),
+    \ printf('ctags -f - --sort=no --excmd=number %s', expand('%:S'))]
+    let lines = map(split(system(cmd), "\n"), 'split(v:val, "\t")')
+    if !v:shell_error
+      break
+    endif
+  endfor
   if v:shell_error
-    throw 'Failed to extract tags'
+    throw get(lines, 0, 'Failed to extract tags')
+  elseif empty(lines)
+    throw 'No tags found'
   endif
   return map(s:align_lists(lines), 'join(v:val, "\t")')
 endfunction