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import: hackage: Make it resilient to missing final newline.

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* guix/import/cabal.scm (peek-next-line-indent): Check for missing final
  newline.
This commit is contained in:
Federico Beffa 2015-11-11 15:31:46 +01:00
parent 9be54eb1b1
commit 876fd23ab6
1 changed files with 18 additions and 13 deletions
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31
guix/import/cabal.scm
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@ -227,19 +227,24 @@ (define (peek-next-line-indent port)
"This function can be called when the next character on PORT is #\newline
and returns the indentation of the line starting after the #\newline
character. Discard (and consume) empty and comment lines."
(let ((initial-newline (string (read-char port))))
(let loop ((char (peek-char port))
(word ""))
(cond ((eqv? char #\newline) (read-char port)
(loop (peek-char port) ""))
((or (eqv? char #\space) (eqv? char #\tab))
(let ((c (read-char port)))
(loop (peek-char port) (string-append word (string c)))))
((comment-line port char) (loop (peek-char port) ""))
(else
(let ((len (string-length word)))
(unread-string (string-append initial-newline word) port)
len))))))
(if (eof-object? (peek-char port))
;; If the file is missing the #\newline on the last line, add it and act
;; as if it were there. This is needed for proper operation of
;; indentation based block recognition (based on ‘port-column’).
(begin (unread-char #\newline port) (read-char port) 0)
(let ((initial-newline (string (read-char port))))
(let loop ((char (peek-char port))
(word ""))
(cond ((eqv? char #\newline) (read-char port)
(loop (peek-char port) ""))
((or (eqv? char #\space) (eqv? char #\tab))
(let ((c (read-char port)))
(loop (peek-char port) (string-append word (string c)))))
((comment-line port char) (loop (peek-char port) ""))
(else
(let ((len (string-length word)))
(unread-string (string-append initial-newline word) port)
len)))))))
(define* (read-value port value min-indent #:optional (separator " "))
"The next character on PORT must be #\newline. Append to VALUE the