Fix #246 Don't run flow if there's no .flowconfig

ale_linters/javascript/flow.vim

@@ -20,31 +20,40 @@ function! ale_linters#javascript#flow#GetExecutable(buffer) abort
 endfunction
 
 function! ale_linters#javascript#flow#GetCommand(buffer) abort
+    let l:flow_config = ale#util#FindNearestFile(a:buffer, '.flowconfig')
+
+    if empty(l:flow_config)
+        " Don't run Flow if we can't find a .flowconfig file.
+        return ''
+    endif
+
     return ale_linters#javascript#flow#GetExecutable(a:buffer)
     \   . ' check-contents --respect-pragma --json --from ale %s'
 endfunction
 
 function! ale_linters#javascript#flow#Handle(buffer, lines) abort
     let l:str = join(a:lines, '')
+
     if l:str ==# ''
         return []
     endif
-  let l:flow_output = json_decode(l:str)
 
-  if has_key(l:flow_output, 'errors')
+    let l:flow_output = json_decode(l:str)
     let l:output = []
 
-    for l:error in l:flow_output.errors
+    for l:error in get(l:flow_output, 'errors', [])
         " Each error is broken up into parts
         let l:text = ''
         let l:line = 0
         let l:col = 0
+
         for l:message in l:error.message
             " Comments have no line of column information
             if has_key(l:message, 'loc') && l:line ==# 0
                 let l:line = l:message.loc.start.line + 0
                 let l:col = l:message.loc.start.column + 0
             endif
+
             if l:text ==# ''
                 let l:text = l:message.descr . ':'
             else
@@ -67,9 +76,6 @@ function! ale_linters#javascript#flow#Handle(buffer, lines) abort
     endfor
 
     return l:output
-  else
-    return []
-  endif
 endfunction
 
 call ale#linter#Define('javascript', {

test/test_flow_command.vader

@@ -0,0 +1,17 @@
+Before:
+  runtime ale_linters/javascript/flow.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(flow should return a command to run if a .flowconfig file exists):
+  silent! cd /testplugin/test
+  :e! flow/a/sub/dummy
+
+  AssertEqual 'flow check-contents --respect-pragma --json --from ale %s', ale_linters#javascript#flow#GetCommand(bufnr('%'))
+
+Execute(flow should not return a command to run if no .flowconfig file exists):
+  silent! cd /testplugin/test
+  :e! flow/b/sub/dummy
+
+  AssertEqual '', ale_linters#javascript#flow#GetCommand(bufnr('%'))

test/test_flow_handler.vader

@@ -0,0 +1,132 @@
+Before:
+  let g:flow_output = {
+  \ "flowVersion": "0.39.0",
+  \ "errors": [
+  \   {
+  \     "kind": "infer",
+  \     "level": "error",
+  \     "message": [
+  \       {
+  \         "context": "  return 1",
+  \         "descr": "number",
+  \         "type": "Blame",
+  \         "loc": {
+  \           "source": "/home/w0rp/Downloads/graphql-js/src/language/parser.js",
+  \           "type": "SourceFile",
+  \           "start": {
+  \             "line": 417,
+  \             "column": 10,
+  \             "offset": 9503
+  \           },
+  \           "end": {
+  \             "line": 417,
+  \             "column": 10,
+  \             "offset": 9504
+  \           }
+  \         },
+  \         "path": "/home/w0rp/Downloads/graphql-js/src/language/parser.js",
+  \         "line": 417,
+  \         "endline": 417,
+  \         "start": 10,
+  \         "end": 10
+  \       },
+  \       {
+  \         "context": v:null,
+  \         "descr": "This type is incompatible with the expected return type of",
+  \         "type": "Comment",
+  \         "path": "",
+  \         "line": 0,
+  \         "endline": 0,
+  \         "start": 1,
+  \         "end": 0
+  \       },
+  \       {
+  \         "context": "function parseArguments(lexer: Lexer<*>): Array<ArgumentNode> {",
+  \         "descr": "array type",
+  \         "type": "Blame",
+  \         "loc": {
+  \           "source": "/home/w0rp/Downloads/graphql-js/src/language/parser.js",
+  \           "type": "SourceFile",
+  \           "start": {
+  \             "line": 416,
+  \             "column": 43,
+  \             "offset": 9472
+  \           },
+  \           "end": {
+  \             "line": 416,
+  \             "column": 61,
+  \             "offset": 9491
+  \           }
+  \         },
+  \         "path": "/home/w0rp/Downloads/graphql-js/src/language/parser.js",
+  \         "line": 416,
+  \         "endline": 416,
+  \         "start": 43,
+  \         "end": 61
+  \       }
+  \     ]
+  \   },
+  \   {
+  \     "kind": "infer",
+  \     "level": "warning",
+  \     "message": [
+  \       {
+  \         "context": "  return peek(lexer, TokenKind.PAREN_L) ?",
+  \         "descr": "unreachable code",
+  \         "type": "Blame",
+  \         "loc": {
+  \           "source": "/home/w0rp/Downloads/graphql-js/src/language/parser.js",
+  \           "type": "SourceFile",
+  \           "start": {
+  \             "line": 419,
+  \             "column": 3,
+  \             "offset": 9508
+  \           },
+  \           "end": {
+  \             "line": 421,
+  \             "column": 7,
+  \             "offset": 9626
+  \           }
+  \         },
+  \         "path": "/home/w0rp/Downloads/graphql-js/src/language/parser.js",
+  \         "line": 419,
+  \         "endline": 421,
+  \         "start": 3,
+  \         "end": 7
+  \       }
+  \     ]
+  \   }
+  \ ],
+  \ "passed": v:false
+  \}
+
+  runtime ale_linters/javascript/flow.vim
+
+After:
+  unlet! g:flow_output
+  unlet! g:expected
+  unlet! g:actual
+  call ale#linter#Reset()
+
+Execute(The flow handler should process errors correctly.):
+  let g:actual = ale_linters#javascript#flow#Handle(347, [json_encode(g:flow_output)])
+  let g:expected = [
+  \ {
+  \   'lnum': 417,
+  \   'bufnr': 347,
+  \   'vcol': 0,
+  \   'type': 'E',
+  \   'col': 10,
+  \   'text': 'number: This type is incompatible with the expected return type of array type',
+  \ },
+  \ {
+  \   'lnum': 419,
+  \   'bufnr': 347,
+  \   'vcol': 0,
+  \   'type': 'W',
+  \   'col': 3,
+  \   'text': 'unreachable code:',
+  \ },
+  \]
+
+  AssertEqual g:expected, g:actual