91 lines
3 KiB
Common Lisp
91 lines
3 KiB
Common Lisp
(defpackage 🕰️.bin
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(:shadow :describe)
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(:use :cl :opts)
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(:import-from :uiop :quit)
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(:import-from :local-time
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:now :timestamp-subtimezone :+utc-zone+
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:*default-timezone* :define-timezone)
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(:import-from :klatre :format-dottime-offset)
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(:import-from :🕰️ :⌚)
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(:export :🚂))
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(in-package :🕰️.bin)
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(declaim (optimize (safety 3)))
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(opts:define-opts
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(:name :help
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:description "Print this help text"
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:short #\h
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:long "help")
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(:name :dot-time
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:description "Use pseudo dot-time format (implies -u)"
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:short #\d
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:long "dot-time")
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(:name :utc
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:description "Display time in UTC instead of local time"
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:short #\u
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:long "utc")
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(:name :no-newline
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:description "Don't print a trailing newline"
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:short #\n
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:long "no-newline"))
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(defun make-slash-terminated (str)
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(if (eq (char str (1- (length str))) #\/)
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str
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(concatenate 'string str "/")))
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; TODO(sterni): upstream this into local-time
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(defun setup-default-timezone ()
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(let* ((tz (remove #\: (uiop:getenv "TZ") :count 1))
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(tz-dir (uiop:getenv "TZDIR"))
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(tz-file (if (and tz tz-dir)
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(merge-pathnames
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(pathname tz)
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(pathname (make-slash-terminated tz-dir)))
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(pathname "/etc/localtime"))))
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(handler-case
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(define-timezone *default-timezone* tz-file :load t)
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(t () (setf *default-timezone* +utc-zone+)))))
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(defun 🚂 ()
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(let ((ts (now)))
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(multiple-value-bind (options free-args)
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(handler-case (opts:get-opts)
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; only handle subset of conditions that can happen here
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(opts:unknown-option (c)
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(format t "error: unknown option ~s~%" (opts:option c))
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(quit 100)))
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; check if we have any free args we don't know what to do with
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(when (> (length free-args) 0)
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(write-string "error: unexpected command line argument(s): ")
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(loop for arg in free-args
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do (progn (write-string arg) (write-char #\space)))
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(write-char #\newline)
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(quit 100))
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; print help and exit
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(when (getf options :help)
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(opts:describe :usage-of "🕰️")
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(quit 0))
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; reinit *default-timezone* as it is cached from compilation
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(setup-default-timezone)
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; dot-time implies UTC, naturally
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(when (getf options :dot-time)
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(setf (getf options :utc) t))
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; print clock face
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(format t "~A" (⌚ ts (if (getf options :utc)
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local-time:+utc-zone+
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local-time:*default-timezone*)))
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; render dot-time offset if necessary
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(when (getf options :dot-time)
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(multiple-value-bind (offset-secs _dst _name)
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(timestamp-subtimezone ts local-time:*default-timezone*)
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(write-string
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(format-dottime-offset (round (/ offset-secs 3600))))))
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; write newline if necessary
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(when (not (getf options :no-newline))
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(write-char #\newline)))))
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