Add golangci-lint (#1890)

ale_linters/go/golangci_lint.vim

@@ -0,0 +1,56 @@
+" Author: Sascha Grunert <mail@saschagrunert.de>
+" Description: Adds support of golangci-lint
+
+call ale#Set('go_golangci_lint_options', '--enable-all')
+call ale#Set('go_golangci_lint_executable', 'golangci-lint')
+call ale#Set('go_golangci_lint_package', 0)
+
+function! ale_linters#go#golangci_lint#GetCommand(buffer) abort
+    let l:filename = expand('#' . a:buffer . ':t')
+    let l:options = ale#Var(a:buffer, 'go_golangci_lint_options')
+    let l:lint_package = ale#Var(a:buffer, 'go_golangci_lint_package')
+
+    if l:lint_package
+        return ale#path#BufferCdString(a:buffer)
+        \   . '%e run '
+        \   .  l:options
+    endif
+
+    return ale#path#BufferCdString(a:buffer)
+    \   . '%e run '
+    \   . ale#util#EscapePCRE(l:filename)
+    \   . ' ' . l:options
+endfunction
+
+function! ale_linters#go#golangci_lint#GetMatches(lines) abort
+    let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+):?(\d+)?:?:?:?\s\*?(.+)$'
+
+    return ale#util#GetMatches(a:lines, l:pattern)
+endfunction
+
+function! ale_linters#go#golangci_lint#Handler(buffer, lines) abort
+    let l:dir = expand('#' . a:buffer . ':p:h')
+    let l:output = []
+
+    for l:match in ale_linters#go#golangci_lint#GetMatches(a:lines)
+        " l:match[1] will already be an absolute path, output from
+        " golangci_lint
+        call add(l:output, {
+        \   'filename': ale#path#GetAbsPath(l:dir, l:match[1]),
+        \   'lnum': l:match[2] + 0,
+        \   'col': l:match[3] + 0,
+        \   'type': 'E',
+        \   'text': l:match[4],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('go', {
+\   'name': 'golangci-lint',
+\   'executable_callback': ale#VarFunc('go_golangci_lint_executable'),
+\   'command_callback': 'ale_linters#go#golangci_lint#GetCommand',
+\   'callback': 'ale_linters#go#golangci_lint#Handler',
+\   'lint_file': 1,
+\})