Add helper for .desktop file creation?

[Pierre Neidhardt <mail@ambrevar.xyz>]

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Hi,

Quite a bunch of packages need to provide their own .desktop since
upstream does not provide them.  It's very evident in games.scm in
particular.

It seems to be a good opportunity to factor this out.  What about the
following?

--8<---------------cut here---------------start------------->8---
(define* (make-desktop-file destination #:key
                            (encoding "UTF-8")
                            name
                            (generic-name name)
                            comment
                            exec
                            icon
                            (startup-notify "true")
                            (terminal "false")
                            (type "Application")
                            (categories "Application"))
  "Create a desktop file at DESTINATION for executable EXEC with name NAME.
Other arguments are optional."
  (let ((maybe-print (lambda (key value)
                       (if value
                           (string-append key "=" value "\n")
                           ""))))
    (mkdir-p (dirname destination))
    (with-output-to-file destination
      (lambda _
        (display
         (string-append
          "[Desktop Entry]" "\n"
          "Encoding=" encoding "\n"
          "Name=" name "\n"
          "GenericName=" generic-name "\n"
          (maybe-print "Comment" comment)
          "Exec=" exec "\n"
          (maybe-print "Icon" icon)
          "StartupNotify=" startup-notify "\n"
          "Terminal=" terminal "\n"
          "Type=" type "\n"
          "Categories=" categories "\n"))))))
--8<---------------cut here---------------end--------------->8---

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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