Support let g:gen_tags#find_tool options

.gitignore

@@ -1 +1,3 @@
 doc/tags
+*/__pycache__/
+*.pyc

autoload/gen_tags.vim

@@ -172,7 +172,7 @@ function! s:job_start(cmd, ...) abort
       let l:job.on_exit = a:1
     endif
 
-    let l:job_id = jobstart(a:cmd, l:job)
+    let l:job_id = jobstart(join(a:cmd), l:job)
   elseif has('job')
     let l:job = {
           \ 'out_cb': function('s:job_stdout'),
@@ -183,8 +183,12 @@ function! s:job_start(cmd, ...) abort
     if a:0 != 0
       let l:job.exit_cb = a:1
     endif
-
-    let l:job_id = job_start(a:cmd, l:job)
+    if has('unix')
+      let l:cmd = ['/bin/sh', '-c', join(a:cmd)]
+    else
+      let l:cmd = ['cmd', '/c', join(a:cmd)]
+    endif
+    let l:job_id = job_start(l:cmd, l:job)
   else
     if has('unix')
       let l:cmd = a:cmd + ['&']

autoload/gen_tags/ctags.vim

@@ -77,12 +77,26 @@ function! s:ctags_gen(filename, dir) abort
 
   let l:cmd = s:ctags_cmd_pre()
 
+  if exists('g:gen_tags#find_tool') && g:gen_tags#find_tool != ''
+    let l:find_tool_cmd = [g:gen_tags#find_tool, expand((gen_tags#find_project_root()))]
+    let l:find_tool_opt = ['-L', '-']
+    let l:cmd = l:find_tool_cmd + ['|'] + l:cmd + l:find_tool_opt
+  endif
+
   if empty(a:filename)
     let l:file = l:dir . '/' . s:ctags_db
-    let l:cmd += ['-f', l:file, '-R', expand(gen_tags#find_project_root())]
+    let l:cmd += ['-f', l:file]
+    " Don't use recursive mode if find_tool exists
+    if !exists('g:gen_tags#find_tool')
+      let l:cmd += ['-R', expand(gen_tags#find_project_root())]
+    endif
   else
     let l:file = a:filename
-    let l:cmd += ['-f', l:file, '-R', expand(a:dir)]
+    let l:cmd += ['-f', l:file]
+    " Don't use recursive mode if find_tool exists
+    if !exists('g:gen_tags#find_tool')
+      let l:cmd += ['-R', expand(gen_tags#find_project_root())]
+    endif
   endif
 
   call gen_tags#system_async(l:cmd)

autoload/gen_tags/gtags.vim

@@ -49,6 +49,12 @@ function! s:gtags_db_gen() abort
     let l:cmd += gen_tags#opt_converter(g:gen_tags#gtags_opts)
   endif
 
+  if exists('g:gen_tags#find_tool') && g:gen_tags#find_tool != ''
+    let l:find_tool_cmd = [g:gen_tags#find_tool, expand((gen_tags#find_project_root()))]
+    let l:find_tool_opt = ['-f', '-']
+    let l:cmd = l:find_tool_cmd + ['|'] + l:cmd + l:find_tool_opt
+  endif
+
   function! s:gtags_db_gen_done(...) abort
     call gen_tags#statusline#clear()