style: '-S format' canonicalizes comments.

* guix/scripts/style.scm (canonicalize-comment): New procedure.
(pretty-print-with-comments): Add #:format-comment. and honor it.
(object->string*): Add 'args' and honor them.
(format-package-definition): Pass #:format-comment to
'object->string*'.
* tests/style.scm ("pretty-print-with-comments, canonicalize-comment"):
New test.

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/style.scm b/tests/style.scm
index 7dae543860..8c6d37a661 100644
--- a/tests/style.scm
+++ b/tests/style.scm
@@ -485,6 +485,31 @@ mnopqrstuvwxyz.\")"
    '(#:phases %standard-phases
      #:tests? #f)))")
 
+(test-equal "pretty-print-with-comments, canonicalize-comment"
+  "\
+(list abc
+      ;; Not a margin comment.
+      ;; Ditto.
+      ;;
+      ;; There's a blank line above.
+      def ;margin comment
+      ghi)"
+  (let ((sexp (call-with-input-string
+                  "\
+(list abc
+  ;Not a margin comment.
+  ;;;  Ditto.
+  ;;;;;
+  ; There's a blank line above.
+  def  ;; margin comment
+  ghi)"
+                read-with-comments)))
+    (call-with-output-string
+      (lambda (port)
+        (pretty-print-with-comments port sexp
+                                    #:format-comment
+                                    canonicalize-comment)))))
+
 (test-end)
 
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