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gnus-shorten-url: Improve and avoid args-out-of-range error

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'gnus-shorten-url' (used by 'gnus-summary-browse-url') ignored
fragment identifiers and didn't check substring bounds, in some cases
leading to runtime errors, e.g.:

  (gnus-shorten-url "https://some.url.with/path/and#also_a_long_target" 40)
  ;; => Lisp error: (args-out-of-range "/path/and" -18 nil)

This commit makes it account for #fragments and fixes faulty string
computation.  (bug#39980)

Do not merge to master, where the helper is put to subr-x.el.

* lisp/gnus/gnus-sum.el (gnus--string-truncate-left): New helper
function (copied from 'ediff-truncate-string-left').
(gnus-shorten-url): Use it and don't drop #fragments.
This commit is contained in:
Štěpán Němec 2020-04-12 19:57:59 +02:00
parent 1dfc497fac
commit 81d07da788
1 changed files with 17 additions and 7 deletions
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24
lisp/gnus/gnus-sum.el
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@ -9493,16 +9493,26 @@ The 1st element is the button named by `gnus-collect-urls-primary-text'."
(push primary urls))
(delete-dups urls)))
;; cf. `ediff-truncate-string-left', to become `string-truncate-left'
;; in Emacs 28
(defun gnus--string-truncate-left (string length)
"Truncate STRING to LENGTH, replacing initial surplus with \"...\"."
(let ((strlen (length string)))
(if (<= strlen length)
string
(setq length (max 0 (- length 3)))
(concat "..." (substring string (max 0 (- strlen 1 length)))))))
(defun gnus-shorten-url (url max)
"Return an excerpt from URL."
"Return an excerpt from URL not exceeding MAX characters."
(if (<= (length url) max)
url
(let ((parsed (url-generic-parse-url url)))
(concat (url-host parsed)
"..."
(substring (url-filename parsed)
(- (length (url-filename parsed))
(max (- max (length (url-host parsed))) 0)))))))
(let* ((parsed (url-generic-parse-url url))
(host (url-host parsed))
(rest (concat (url-filename parsed)
(when-let ((target (url-target parsed)))
(concat "#" target)))))
(concat host (gnus--string-truncate-left rest (- max (length host)))))))
(defun gnus-summary-browse-url (&optional external)
"Scan the current article body for links, and offer to browse them.