+ (gnus-continuum-version gnus-newsrc-file-version)))
+ (gcv (gnus-continuum-version)))
+ (when fcv
+ ;; A newsrc file was loaded.
+ (let (prompt-displayed
+ (converters
+ (sort
+ (mapcar (lambda (date-func)
+ (cons (gnus-continuum-version (car date-func))
+ date-func))
+ ;; This is a list of converters that must be run
+ ;; to bring the newsrc file up to the current
+ ;; version. If you create an incompatibility
+ ;; with older versions, you should create an
+ ;; entry here. The entry should consist of the
+ ;; current gnus version (hardcoded so that it
+ ;; doesn't change with each release) and the
+ ;; function that must be applied to convert the
+ ;; previous version into the current version.
+ '(("September Gnus v0.1" nil
+ gnus-convert-old-ticks)
+ ("Oort Gnus v0.08" "legacy-gnus-agent"
+ gnus-agent-convert-to-compressed-agentview)
+ ("Gnus v5.10.7" "legacy-gnus-agent"
+ gnus-agent-unlist-expire-days)
+ ("Gnus v5.10.7" "legacy-gnus-agent"
+ gnus-agent-unhook-expire-days)))
+ #'car-less-than-car)))
+ ;; Skip converters older than the file version
+ (while (and converters (>= fcv (caar converters)))
+ (pop converters))
+
+ ;; Perform converters to bring older version up to date.
+ (when (and converters (< fcv (caar converters)))
+ (while (and converters (< fcv (caar converters))
+ (<= (caar converters) gcv))
+ (let* ((converter-spec (pop converters))
+ (convert-to (nth 1 converter-spec))
+ (load-from (nth 2 converter-spec))
+ (func (nth 3 converter-spec)))
+ (when (and load-from
+ (not (fboundp func)))
+ (load load-from t))
+ (or prompt-displayed
+ (not (gnus-convert-converter-needs-prompt func))
+ (while (let (c
+ (cursor-in-echo-area t)
+ (echo-keystrokes 0))
+ (message "Convert gnus from version '%s' to '%s'? (n/y/?)"
+ gnus-newsrc-file-version gnus-version)
+ (setq c (read-char-exclusive))
+
+ (cond ((or (eq c ?n) (eq c ?N))
+ (error "Can not start gnus without converting"))
+ ((or (eq c ?y) (eq c ?Y))
+ (setq prompt-displayed t)
+ nil)
+ ((eq c ?\?)
+ (message "This conversion is irreversible. \
+ To be safe, you should backup your files before proceeding.")
+ (sit-for 5)
+ t)
+ (t
+ (gnus-message 3 "Ignoring unexpected input")
+ (sit-for 3)
+ t)))))
+
+ (funcall func convert-to)))
+ (gnus-dribble-enter
+ (format ";Converted gnus from version '%s' to '%s'."
+ gnus-newsrc-file-version gnus-version)))))))
+
+(defun gnus-convert-mark-converter-prompt (converter no-prompt)
+ "Indicate whether CONVERTER requires gnus-convert-old-newsrc to
+ display the conversion prompt. NO-PROMPT may be nil (prompt),
+ t (no prompt), or any form that can be called as a function.
+ The form should return either t or nil."
+ (put converter 'gnus-convert-no-prompt no-prompt))
+
+(defun gnus-convert-converter-needs-prompt (converter)
+ (let ((no-prompt (get converter 'gnus-convert-no-prompt)))
+ (not (if (memq no-prompt '(t nil))
+ no-prompt
+ (funcall no-prompt)))))
+
+(defun gnus-convert-old-ticks (converting-to)
projects / gnus / blobdiff