Check Vim plugin code with Vint

.github/workflows/checks.yml

@@ -15,3 +15,16 @@ jobs:
         run: make
       - name: Run
         run: test -x bin/ql && (bin/ql || true)
+  vint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.11
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install vim-vint
+      - name: Run vint
+        run: vint .

plugin/ql.vim

@@ -8,7 +8,7 @@ let s:cmd = exepath(s:path . '/bin/ql')
 
 if exists('g:ql_command')
   let s:cmd = g:ql_command
-elseif s:cmd != ''
+elseif !empty(s:cmd)
   let s:cmd = s:cmd . ' --title "$TITLE"'
 elseif executable('ql')
   let s:cmd = exepath('ql') . ' --title "$TITLE"'
@@ -37,13 +37,13 @@ endfunction
 function! s:view(...) abort
   let argc = a:0
 
-  if argc == 0
+  if argc > 0
+    let path = a:1
+    let name = fnamemodify(path, ':t')
+  else
     let name = expand('%:t')
     let path = tempname() . '.' . name
     silent execute 'write ' . fnameescape(path)
-  else
-    let path = a:1
-    let name = fnamemodify(path, ':t')
   endif
 
   if !filereadable(path)