Add seconds-to-condensed-time-string

[kmrcl.git] / datetime.lisp

diff --git a/datetime.lisp b/datetime.lisp
index b3dbc1a47f895895e549064059d876202c0b5a74..b865f48a3ece1d541d2ecea8e2d3119ec5e5939e 100644 (file)
--- a/datetime.lisp
+++ b/datetime.lisp
@@ -50,6 +50,42 @@
                 year
                 hr min sec))))
 
                 year
                 hr min sec))))
 

+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (defconstant +minute-seconds+ 60)
+  (defconstant +hour-seconds+ (* 60 +minute-seconds+))
+  (defconstant +day-seconds+ (* 24 +hour-seconds+))
+  (defconstant +week-seconds+ (* +day-seconds+ 7))
+  (defconstant +month-seconds+ (* +day-seconds+ (/ 365.25 12)))
+  (defconstant +year-seconds+ (* +day-seconds+ 365.25)))
+
+(defun seconds-to-condensed-time-string (sec &key (dp-digits 0))
+  "Prints a quantity of seconds as a condensed string. DP-DIGITS controls
+how many digits after decimal point."
+  (multiple-value-bind (year yrem) (floor (coerce sec 'double-float) +year-seconds+)
+    (multiple-value-bind (month mrem) (floor yrem +month-seconds+)
+      (multiple-value-bind (week wrem) (floor mrem +week-seconds+)
+        (multiple-value-bind (day drem) (floor wrem +day-seconds+)
+          (multiple-value-bind (hour hrem) (floor drem +hour-seconds+)
+            (multiple-value-bind (minute minrem) (floor hrem +minute-seconds+)
+              (let ((secstr (if (zerop dp-digits)
+                                (format nil "~Ds" (round minrem))
+                                (format nil (format nil "~~,~DFs" dp-digits) minrem))))
+                (cond
+                  ((plusp year)
+                   (format nil "~Dy~DM~Dw~Dd~Dh~Dm~A" year month week day hour minute secstr))
+                  ((plusp month)
+                   (format nil "~DM~Dw~Dd~Dh~Dm~A" month week day hour minute secstr))
+                  ((plusp week)
+                   (format nil "~Dw~Dd~Dh~Dm~A" week day hour minute secstr))
+                  ((plusp day)
+                   (format nil "~Dd~Dh~Dm~A" day hour minute secstr))
+                  ((plusp hour)
+                   (format nil "~Dh~Dm~A" hour minute secstr))
+                  ((plusp minute)
+                   (format nil "~Dm~A" minute secstr))
+                  (t
+                   secstr))))))))))
+

 (defun print-seconds (secs)
   (print-float-units secs "sec"))
 
 (defun print-seconds (secs)
   (print-float-units secs "sec"))