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etc: Break long lines in commit messages. 

* etc/committer.scm.in (break-string): New procedure.
(change-commit-message): Use it.
master
Ricardo Wurmus 2021-05-04 11:49:07 +02:00
parent 7694acebd1
commit 570b3d32b9
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GPG Key ID: 197A5888235FACAC
1 changed files with 40 additions and 12 deletions
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52
etc/committer.scm.in
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@ -38,6 +38,33 @@
(ice-9 rdelim)
(ice-9 textual-ports))
(define* (break-string str #:optional (max-line-length 70))
"Break the string STR into lines that are no longer than MAX-LINE-LENGTH.
Return a single string."
(define (restore-line words)
(string-join (reverse words) " "))
(if (<= (string-length str) max-line-length)
str
(let ((words+lengths (map (lambda (word)
(cons word (string-length word)))
(string-tokenize str))))
(match (fold (match-lambda*
(((word . length)
(count current lines))
(let ((new-count (+ count length 1)))
(if (< new-count max-line-length)
(list new-count
(cons word current)
lines)
(list length
(list word)
(cons (restore-line current) lines))))))
'(0 () ())
words+lengths)
((_ last-words lines)
(string-join (reverse (cons (restore-line last-words) lines))
"\n"))))))
(define (read-excursion port)
"Read an expression from PORT and reset the port position before returning
the expression."
@ -204,18 +231,19 @@ corresponding to the top-level definition containing the staged changes."
(added (lset-difference equal? new-values old-values)))
(format port
"[~a]: ~a~%" field
(match (list (map symbol->string removed)
(map symbol->string added))
((() added)
(format #f "Add ~a."
(listify added)))
((removed ())
(format #f "Remove ~a."
(listify removed)))
((removed added)
(format #f "Remove ~a; add ~a."
(listify removed)
(listify added)))))))))
(break-string
(match (list (map symbol->string removed)
(map symbol->string added))
((() added)
(format #f "Add ~a."
(listify added)))
((removed ())
(format #f "Remove ~a."
(listify removed)))
((removed added)
(format #f "Remove ~a; add ~a."
(listify removed)
(listify added))))))))))
'(inputs propagated-inputs native-inputs)))
(define* (add-commit-message file-name variable-name #:optional (port (current-output-port)))