Integration of qmlfmt linting tool (#1462)

* Add first qmlfmt support

* Add GetCommand() function

- pass --error/-e option

* Add handle unittest

- fix pattern regex
- store col as integer

* Update docs

* Add command callback unit test

1 files changed, 40 insertions, 0 deletions

diff --git a/ale_linters/qml/qmlfmt.vim b/ale_linters/qml/qmlfmt.vim
new file mode 100644
index 00000000..85b131fd
--- /dev/null
+++ b/ale_linters/qml/qmlfmt.vim
@@ -0,0 +1,40 @@
+" Author: pylipp (www.github.com/pylipp)
+" Description: qmlfmt for QML files
+
+let g:ale_qml_qmlfmt_executable = get(g:, 'ale_qml_qmlfmt_executable', 'qmlfmt')
+
+function! ale_linters#qml#qmlfmt#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'qml_qmlfmt_executable')
+endfunction
+
+function! ale_linters#qml#qmlfmt#GetCommand(buffer) abort
+    return ale#Escape(ale_linters#qml#qmlfmt#GetExecutable(a:buffer))
+    \   . ' -e'
+endfunction
+
+" Find lines like
+" Error:11:1: Expected token `}'
+function! ale_linters#qml#qmlfmt#Handle(buffer, lines) abort
+    let l:pattern = '\v^(Error|Warning):(\d+):(\d+): (.+)$'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:pattern)
+        let l:item = {
+        \   'lnum': l:match[2] + 0,
+        \   'col': l:match[3] + 0,
+        \   'text': l:match[4],
+        \   'type': l:match[1] is# 'Warning' ? 'W' : 'E',
+        \}
+        call add(l:output, l:item)
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('qml', {
+\   'name': 'qmlfmt',
+\   'output_stream': 'stderr',
+\   'executable_callback': 'ale_linters#qml#qmlfmt#GetExecutable',
+\   'command_callback': 'ale_linters#qml#qmlfmt#GetCommand',
+\   'callback': 'ale_linters#qml#qmlfmt#Handle',
+\})