Add swiftpm ale checker

Author: keith

ale_linters/swift/swiftpm.vim

@@ -0,0 +1,60 @@
+if !exists('g:ale_swift_swiftpm_executable')
+  let g:ale_swift_swiftpm_executable = 'swift'
+endif
+
+if !exists('g:ale_swift_swiftpm_arguments')
+  let g:ale_swift_swiftpm_arguments = 'build'
+endif
+
+function! ale_linters#swift#swiftpm#GetExecutable(buffer)
+  if !filereadable('Package.swift')
+    return ''
+  endif
+
+  return g:ale_swift_swiftpm_executable
+endfunction
+
+function! ale_linters#swift#swiftpm#GetCommand(buffer)
+  return g:ale_swift_swiftpm_executable
+        \ . ' '
+        \ . g:ale_swift_swiftpm_arguments
+endfunction
+
+function! ale_linters#swift#swiftpm#Handle(buffer, lines)
+  " Match and ignore file path (anything but :)
+  " Match and capture line number
+  " Match and capture column number
+  " Match and capture anything in the message
+  let l:pattern = '^[^:]\+:\(\d\+\):\(\d\+\):\s*error:\s*\(.*\)$'
+  let l:output = []
+
+  for l:line in a:lines
+    let l:match = matchlist(l:line, l:pattern)
+
+    if len(l:match) == 0
+      continue
+    endif
+
+    let l:line_number = l:match[1]
+    let l:column = l:match[2]
+    let l:text = l:match[3]
+
+    call add(l:output, {
+          \ 'bufnr': a:buffer,
+          \ 'lnum': l:line_number,
+          \ 'vcol': 0,
+          \ 'col': l:column,
+          \ 'text': l:text,
+          \ 'type': 'E',
+        \ })
+  endfor
+
+  return l:output
+endfunction
+
+call ale#linter#Define('swift', {
+      \ 'name': 'swiftpm',
+      \ 'executable_callback': 'ale_linters#swift#swiftpm#GetExecutable',
+      \ 'command_callback': 'ale_linters#swift#swiftpm#GetCommand',
+      \ 'callback': 'ale_linters#swift#swiftpm#Handle',
+    \ })