job-specifier: Adapt 'bump-time' to 'next-...-from' procedures

This is a follow-up to commit 913e3c65e4.

Since 'next-...-from' procedures now uses an '#:optional' argument
instead of a dotted optional arguments list, 'bump-time' doesn't need to
unwrap VALUE-LIST anymore.

* src/mcron/job-specifier.scm (bump-time): Pass VALUE-LIST directly to
'%find-best-next'.
* tests/job-specifier.scm ("next-hour-from"): New test.
* NEWS: Update.

Reported-by: Ludovic Courtès <ludo@gnu.org>

NEWS

@@ -10,6 +10,12 @@ GNU Mcron NEWS                                    -*- outline -*-
   The programs now sets the GUILE_LOAD_PATH and GUILE_LOAD_COMPILED_PATH
   environment variables with the location of the installed Guile modules.
 
+  'next-year-from', 'next-year', 'next-month-from', 'next-month',
+  'next-day-from', 'next-day', 'next-hour-from', 'next-hour',
+  'next-minute-from', 'next-minute', 'next-second-from', and 'next-second' no
+  longer crashes when passing an optional arguments.
+  [bug introduced in mcron-1.1]
+
 ** Improvements
 
   Some basic tests for the installed programs can be run after 'make install'

src/mcron/job-specifier.scm

@@ -85,21 +85,15 @@ go into the list.  For example, (range 1 6 2) returns '(1 3 5)."
   ;;
   ;; ... except that the function is actually generalized to deal with
   ;; seconds, minutes, etc., in an obvious way :-)
-  ;;
-  ;; Note that value-list always comes from an optional argument to a
-  ;; procedure, so is wrapped up as the first element of a list (i.e. it is a
-  ;; list inside a list).
-  (match value-list
-    (()
-     (set-component! time (1+ (component time))))
-    ((val . rest)
-     (match (%find-best-next (component time) val)
-       ((smallest . closest+)
-        (cond ((inf? closest+)
-               (set-higher-component! time (1+ (higher-component time)))
-               (set-component! time smallest))
-              (else
-               (set-component! time closest+)))))))
+  (if (null? value-list)
+      (set-component! time (1+ (component time)))
+      (match (%find-best-next (component time) value-list)
+        ((smallest . closest+)
+         (cond ((inf? closest+)
+                (set-higher-component! time (1+ (higher-component time)))
+                (set-component! time smallest))
+               (else
+                (set-component! time closest+))))))
   (first (mktime time)))
 
 ;; Set of configuration methods which use the above general function to bump

tests/job-specifier.scm

@@ -49,4 +49,8 @@
   (match (pk 'match (%find-best-next 1 '(0 2)))
     ((a . b) (and (exact? a) (exact? b)))))
 
+(test-equal "next-hour-from"
+  7200
+  (next-hour-from 10 '(0 3 7)))
+
 (test-end)