changed gqlint to lint the file on disk

- added a cd into the direcotry containing the file in the buffer
  in order to properly check for a config file
- added command_callback tests for graphql

ale_linters/graphql/gqlint.vim

@@ -1,9 +1,15 @@
 " Author: Michiel Westerbeek <happylinks@gmail.com>
 " Description: Linter for GraphQL Schemas
 
+function! ale_linters#graphql#gqlint#GetCommand(buffer) abort
+    return ale#path#BufferCdString(a:buffer)
+    \   . 'gqlint'
+    \   . ' --reporter=simple %t'
+endfunction
+
 call ale#linter#Define('graphql', {
 \   'name': 'gqlint',
 \   'executable': 'gqlint',
-\   'command': 'gqlint --reporter=simple %t',
+\   'command_callback': 'ale_linters#graphql#gqlint#GetCommand',
 \   'callback': 'ale#handlers#unix#HandleAsWarning',
 \})

test/command_callback/test_graphql_gqlint_command_callbacks.vader

@@ -0,0 +1,11 @@
+Before:
+  call ale#assert#SetUpLinterTest('graphql', 'gqlint')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The linter should run from the directory of the file in the buffer):
+  AssertLinter 'gqlint',
+  \ ale#path#CdString(expand('%:p:h'))
+  \   . 'gqlint --reporter=simple'
+  \   . ' %t'