Check user systemd unit files with systemd-analyze

ale_linters/systemd/systemd_analyze.vim

@@ -0,0 +1,25 @@
+function! ale_linters#systemd#systemd_analyze#Handle(buffer, lines) abort
+    let l:re = '\v(.+):([0-9]+): (.+)'
+    let l:output = []
+
+    for l:match in ale#util#GetMatches(a:lines, l:re)
+        call add(l:output, {
+        \   'lnum': str2nr(l:match[2]),
+        \   'col': 1,
+        \   'type': 'W',
+        \   'text': l:match[3],
+        \})
+    endfor
+
+    return l:output
+endfunction
+
+call ale#linter#Define('systemd', {
+\   'name': 'systemd_analyze',
+\   'aliases': ['systemd-analyze'],
+\   'executable': 'systemd-analyze',
+\   'command': 'SYSTEMD_LOG_COLOR=0 %e --user verify %s',
+\   'callback': 'ale_linters#systemd#systemd_analyze#Handle',
+\   'output_stream': 'both',
+\   'lint_file': 1,
+\})