From 512f81407c772992bc2ac355ebef002df2bfdf1f Mon Sep 17 00:00:00 2001 From: Stefan Monnier Date: Mon, 4 Dec 2017 15:36:22 -0500 Subject: [PATCH] * lisp/calendar/solar.el: Use lexical-binding (date): Don't declare globally. (solar-time-string): Use calendar-dlet*. * lisp/calendar/calendar.el (calendar-dlet*): New macro. --- lisp/calendar/calendar.el | 31 +++++++++++++++++++++++++++++++ lisp/calendar/solar.el | 21 +++++++++++---------- 2 files changed, 42 insertions(+), 10 deletions(-) diff --git a/lisp/calendar/calendar.el b/lisp/calendar/calendar.el index 96ccd94382c..76b077ba95c 100644 --- a/lisp/calendar/calendar.el +++ b/lisp/calendar/calendar.el @@ -115,6 +115,37 @@ (load "cal-loaddefs" nil t) +;; Calendar has historically relied heavily on dynamic scoping. +;; Concretely, this manifests in the use of references to let-bound variables +;; in Custom vars as well as code in diary files. +;; `eval` is hence the core of the culprit. It's used on: +;; - calendar-date-display-form +;; - calendar-time-display-form +;; - calendar-chinese-time-zone +;; - in cal-dst's there are various calls to `eval' but they seem not to refer +;; to let-bound variables, surprisingly. +;; - calendar-date-echo-text +;; - calendar-mode-line-format +;; - cal-tex-daily-string +;; - diary-date-forms +;; - diary-remind-message +;; - calendar-holidays +;; - calendar-location-name +;; - whatever is passed to calendar-string-spread +;; - whatever is passed to calendar-insert-at-column +;; - whatever is passed to diary-sexp-entry +;; - whatever is passed to diary-remind + +(defmacro calendar-dlet* (binders &rest body) + "Like `let*' but using dynamic scoping." + (declare (indent 1) (debug let)) + `(progn + (with-no-warnings ;Silence "lacks a prefix" warnings! + ,@(mapcar (lambda (binder) + `(defvar ,(if (consp binder) (car binder) binder))) + binders)) + (let* ,binders ,@body))) + ;; Avoid recursive load of calendar when loading cal-menu. Yuck. (provide 'calendar) (require 'cal-menu) diff --git a/lisp/calendar/solar.el b/lisp/calendar/solar.el index 5bf072384fd..84e8bb3d259 100644 --- a/lisp/calendar/solar.el +++ b/lisp/calendar/solar.el @@ -1,4 +1,4 @@ -;;; solar.el --- calendar functions for solar events +;;; solar.el --- calendar functions for solar events -*- lexical-binding:t -*- ;; Copyright (C) 1992-1993, 1995, 1997, 2001-2017 Free Software ;; Foundation, Inc. @@ -552,12 +552,14 @@ degrees to find out if polar regions have 24 hours of sun or only night." "Printable form for decimal fraction TIME in TIME-ZONE. Format used is given by `calendar-time-display-form'." (let* ((time (round (* 60 time))) - (24-hours (/ time 60)) + (24-hours (/ time 60))) + (calendar-dlet* + ((time-zone time-zone) (minutes (format "%02d" (% time 60))) (12-hours (format "%d" (1+ (% (+ 24-hours 11) 12)))) (am-pm (if (>= 24-hours 12) "pm" "am")) (24-hours (format "%02d" 24-hours))) - (mapconcat 'eval calendar-time-display-form ""))) + (mapconcat #'eval calendar-time-display-form "")))) (defun solar-daylight (time) "Printable form for TIME expressed in hours." @@ -661,10 +663,10 @@ Optional NOLOCATION non-nil means do not print the location." (format "%s, %s%s (%s hrs daylight)" (if (car l) - (concat "Sunrise " (apply 'solar-time-string (car l))) + (concat "Sunrise " (apply #'solar-time-string (car l))) "No sunrise") (if (cadr l) - (concat "sunset " (apply 'solar-time-string (cadr l))) + (concat "sunset " (apply #'solar-time-string (cadr l))) "no sunset") (if nolocation "" (format " at %s" (eval calendar-location-name))) @@ -749,7 +751,7 @@ The values of `calendar-daylight-savings-starts', (+ 4.9353929 (* 62833.1961680 U) (* 0.0000001 - (apply '+ + (apply #'+ (mapcar (lambda (x) (* (car x) (sin (mod @@ -889,13 +891,12 @@ Accurate to a few seconds." (insert (format "%s %2d: " (calendar-month-name month t) (1+ i)) (solar-sunrise-sunset-string date t) "\n"))))) -(defvar date) - -;; To be called from diary-list-sexp-entries, where DATE is bound. ;;;###diary-autoload (defun diary-sunrise-sunset () "Local time of sunrise and sunset as a diary entry. Accurate to a few seconds." + ;; To be called from diary-list-sexp-entries, where DATE is bound. + (with-no-warnings (defvar date)) (or (and calendar-latitude calendar-longitude calendar-time-zone) (solar-setup)) (solar-sunrise-sunset-string date)) @@ -938,7 +939,7 @@ Accurate to within a minute between 1951 and 2050." (W (- (* 35999.373 T) 2.47)) (Delta-lambda (+ 1 (* 0.0334 (solar-cosine-degrees W)) (* 0.0007 (solar-cosine-degrees (* 2 W))))) - (S (apply '+ (mapcar (lambda(x) + (S (apply #'+ (mapcar (lambda(x) (* (car x) (solar-cosine-degrees (+ (* (nth 2 x) T) (cadr x))))) solar-seasons-data))) -- 2.39.5