systemd unit checker

[holomorph]

i feel silly for having written this, but here you go! I just realized systemd-analyze had this, but in my brief testing: the line numbers the tool outputs are questionable, but the messages are useful and accurate.

(flycheck-define-checker systemd-analyze
  "A systemd unit checker using systemd-analyze(1).

See URL `https://www.freedesktop.org/software/systemd/man/systemd-analyze.html'."
  :command ("systemd-analyze" "verify" source-original)
  :error-patterns
  ((error line-start "["
          (file-name) ":" line "] " (message) line-end))
  :modes (systemd-mode))

[cpitclaudel]

Looks very nice, thanks! I think we'd be happy to include this by default with Flycheck. However, can you package this snippet as a pull request, with corresponding updates to the manual?

Thanks!

[manuel-uberti]

Interesting indeed, please open a PR. 👍