Fix #1038 - Automatically detect and use htmlhint configuration files

test/command_callback/test_htmlhint_command_callback.vader

@@ -0,0 +1,71 @@
+Before:
+  Save g:ale_html_htmlhint_options
+  Save g:ale_html_htmlhint_executable
+  Save g:ale_html_htmlhint_use_global
+
+  unlet! g:ale_html_htmlhint_options
+  unlet! g:ale_html_htmlhint_executable
+  unlet! g:ale_html_htmlhint_use_global
+
+  runtime ale_linters/html/htmlhint.vim
+  call ale#test#SetDirectory('/testplugin/test/command_callback')
+  call ale#test#SetFilename('htmlhint_paths/test.html')
+
+  let g:node_executable = ale#path#Simplify(
+  \ g:dir
+  \ .  '/htmlhint_paths/node_modules/.bin/htmlhint'
+  \)
+  let g:config_path = ale#path#Simplify(
+  \ g:dir
+  \ .  '/htmlhint_paths/with_config/.htmlhintrc'
+  \)
+
+After:
+  Restore
+
+  unlet! g:node_executable
+  unlet! g:config_path
+
+  call ale#test#RestoreDirectory()
+  call ale#linter#Reset()
+
+Execute(The default command should be correct):
+  AssertEqual
+  \ ale#Escape(g:node_executable) . ' --format=unix %t',
+  \ ale_linters#html#htmlhint#GetCommand(bufnr(''))
+
+Execute(The global executable should be uesd if the option is set):
+  let g:ale_html_htmlhint_executable = 'foo'
+  let g:ale_html_htmlhint_use_global = 1
+
+  AssertEqual
+  \ ale#Escape('foo') . ' --format=unix %t',
+  \ ale_linters#html#htmlhint#GetCommand(bufnr(''))
+
+" This is so old configurations which might include this still work.
+Execute(--format=unix should be removed from the options if added):
+  let g:ale_html_htmlhint_options = '--format=unix'
+
+  AssertEqual
+  \ ale#Escape(g:node_executable) . ' --format=unix %t',
+  \ ale_linters#html#htmlhint#GetCommand(bufnr(''))
+
+Execute(The configuration file should be automatically detected):
+  call ale#test#SetFilename('htmlhint_paths/with_config/test.html')
+
+  AssertEqual
+  \ ale#Escape(g:node_executable)
+  \   . '  --config ' . ale#Escape(g:config_path)
+  \   . ' --format=unix %t',
+  \ ale_linters#html#htmlhint#GetCommand(bufnr(''))
+
+" This is so old configurations which might include the config will work.
+Execute(The configuration file should be configurable through the options variable):
+  call ale#test#SetFilename('htmlhint_paths/with_config/test.html')
+  let g:ale_html_htmlhint_options = '--config=/foo/bar/.htmlhintrc'
+
+  AssertEqual
+  \ ale#Escape(g:node_executable)
+  \   . ' --config=/foo/bar/.htmlhintrc'
+  \   . ' --format=unix %t',
+  \ ale_linters#html#htmlhint#GetCommand(bufnr(''))