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(in-package #:trivial-backtrace)
(defparameter *date-time-format* "%Y-%m-%d-%H:%M"
"The default format to use when printing dates and times.
* %% - A '%' character
* %d - Day of the month as a decimal number [01-31]
* %e - Same as %d but does not print the leading 0 for days 1 through 9
[unlike strftime[], does not print a leading space]
* %H - Hour based on a 24-hour clock as a decimal number [00-23]
*%I - Hour based on a 12-hour clock as a decimal number [01-12]
* %m - Month as a decimal number [01-12]
* %M - Minute as a decimal number [00-59]
* %S - Second as a decimal number [00-59]
* %w - Weekday as a decimal number [0-6], where Sunday is 0
* %y - Year without century [00-99]
* %Y - Year with century [such as 1990]
This code is borrowed from the `format-date` function in
[metatilities-base][].")
;; modified from metatilities-base
(eval-when (:compile-toplevel :load-toplevel :execute)
(defmacro generate-time-part-function (part-name position)
(let ((function-name
(intern
(concatenate 'string
(symbol-name 'time) "-" (symbol-name part-name))
:trivial-backtrace)))
`(eval-when (:compile-toplevel :load-toplevel :execute)
(defun ,function-name
(&optional (universal-time (get-universal-time))
(time-zone nil))
,(format nil "Returns the ~(~A~) part of the given time." part-name)
(nth-value ,position
(apply #'decode-universal-time
universal-time time-zone))))))
(generate-time-part-function second 0)
(generate-time-part-function minute 1)
(generate-time-part-function hour 2)
(generate-time-part-function date 3)
(generate-time-part-function month 4)
(generate-time-part-function year 5)
(generate-time-part-function day-of-week 6)
(generate-time-part-function daylight-savings-time-p 7))
(defun date-time-string (&key (date/time (get-universal-time))
(format *date-time-format*))
(format-date format date/time nil))
(defun format-date (format date &optional stream time-zone)
(declare (ignore time-zone))
(let ((format-length (length format)))
(format
stream "~{~A~}"
(loop for index = 0 then (1+ index)
while (< index format-length) collect
(let ((char (aref format index)))
(cond
((char= #\% char)
(setf char (aref format (incf index)))
(cond
;; %% - A '%' character
((char= char #\%) #\%)
;; %d - Day of the month as a decimal number [01-31]
((char= char #\d) (format nil "~2,'0D" (time-date date)))
;; %e - Same as %d but does not print the leading 0 for
;; days 1 through 9. Unlike strftime, does not print a
;; leading space
((char= char #\e) (format nil "~D" (time-date date)))
;; %H - Hour based on a 24-hour clock as a decimal number [00-23]
((char= char #\H) (format nil "~2,'0D" (time-hour date)))
;; %I - Hour based on a 12-hour clock as a decimal number [01-12]
((char= char #\I) (format nil "~2,'0D"
(1+ (mod (time-hour date) 12))))
;; %m - Month as a decimal number [01-12]
((char= char #\m) (format nil "~2,'0D" (time-month date)))
;; %M - Minute as a decimal number [00-59]
((char= char #\M) (format nil "~2,'0D" (time-minute date)))
;; %S - Second as a decimal number [00-59]
((char= char #\S) (format nil "~2,'0D" (time-second date)))
;; %w - Weekday as a decimal number [0-6], where Sunday is 0
((char= char #\w) (format nil "~D" (time-day-of-week date)))
;; %y - Year without century [00-99]
((char= char #\y)
(let ((year-string (format nil "~,2A" (time-year date))))
(subseq year-string (- (length year-string) 2))))
;; %Y - Year with century [such as 1990]
((char= char #\Y) (format nil "~D" (time-year date)))
(t
(error "Ouch - unknown formatter '%~c" char))))
(t char)))))))
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