643 lines
23 KiB
EmacsLisp
643 lines
23 KiB
EmacsLisp
;;; compat-27.el --- Compatibility Layer for Emacs 27.1 -*- lexical-binding: t; -*-
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;; Copyright (C) 2021, 2022 Free Software Foundation, Inc.
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;; Author: Philip Kaludercic <philipk@posteo.net>
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;; Maintainer: Compat Development <~pkal/compat-devel@lists.sr.ht>
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;; URL: https://git.sr.ht/~pkal/compat/
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;; Keywords: lisp
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Find here the functionality added in Emacs 27.1, needed by older
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;; versions.
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;;
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;; Do NOT load this library manually. Instead require `compat'.
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;;; Code:
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(eval-when-compile (require 'compat-macs))
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;;;; Defined in fns.c
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(compat-defun proper-list-p (object)
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"Return OBJECT's length if it is a proper list, nil otherwise.
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A proper list is neither circular nor dotted (i.e., its last cdr
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is nil)."
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:min-version "26.1"
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:max-version "26.3"
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:realname compat--proper-list-p-length-signal
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(condition-case nil
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(and (listp object) (length object))
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(wrong-type-argument nil)
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(circular-list nil)))
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(compat-defun proper-list-p (object)
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"Return OBJECT's length if it is a proper list, nil otherwise.
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A proper list is neither circular nor dotted (i.e., its last cdr
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is nil)."
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:max-version "25.3"
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:realname compat--proper-list-p-tortoise-hare
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(when (listp object)
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(catch 'cycle
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(let ((hare object) (tortoise object)
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(max 2) (q 2))
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(while (consp hare)
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(setq hare (cdr hare))
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(when (and (or (/= 0 (setq q (1- q)))
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(ignore
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(setq max (ash max 1)
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q max
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tortoise hare)))
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(eq hare tortoise))
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(throw 'cycle nil)))
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(and (null hare) (length object))))))
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(compat-defun string-distance (string1 string2 &optional bytecompare)
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"Return Levenshtein distance between STRING1 and STRING2.
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The distance is the number of deletions, insertions, and substitutions
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required to transform STRING1 into STRING2.
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If BYTECOMPARE is nil or omitted, compute distance in terms of characters.
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If BYTECOMPARE is non-nil, compute distance in terms of bytes.
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Letter-case is significant, but text properties are ignored."
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;; https://en.wikipedia.org/wiki/Levenshtein_distance
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(let ((s1 (if bytecompare
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(encode-coding-string string1 'raw-text)
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(concat string1 "")))
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(s2 (if bytecompare
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(encode-coding-string string2 'raw-text)
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string2)))
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(let* ((len1 (length s1))
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(len2 (length s2))
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(column (make-vector (1+ len1) 0)))
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(dotimes (y len1)
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(setf (aref column (1+ y)) y))
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(dotimes (x len2)
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(setf (aref column 0) (1+ x))
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(let ((lastdiag x) olddiag)
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(dotimes (y len1)
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(setf olddiag (aref column (1+ y))
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(aref column (1+ y))
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(min (+ (if (= (aref s1 y) (aref s2 x)) 0 1)
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lastdiag)
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(1+ (aref column (1+ y)))
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(1+ (aref column y)))
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lastdiag olddiag))))
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(aref column len1))))
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;;;; Defined in window.c
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(compat-defun recenter (&optional arg redisplay)
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"Handle optional argument REDISPLAY."
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:prefix t
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(recenter arg)
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(when (and redisplay recenter-redisplay)
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(redisplay)))
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;;;; Defined in keymap.c
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(compat-defun lookup-key (keymap key &optional accept-default)
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"Allow for KEYMAP to be a list of keymaps."
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:prefix t
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(cond
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((keymapp keymap)
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(lookup-key keymap key accept-default))
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((listp keymap)
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(catch 'found
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(dolist (map keymap)
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(let ((fn (lookup-key map key accept-default)))
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(when fn (throw 'found fn))))))
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((signal 'wrong-type-argument (list 'keymapp keymap)))))
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;;;; Defined in json.c
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(declare-function json-parse-string nil (string &rest args))
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(declare-function json-encode-string "json" (object))
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(declare-function json-read-from-string "json" (string))
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(declare-function json-read "json" ())
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(defvar json-object-type)
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(defvar json-array-type)
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(defvar json-false)
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(defvar json-null)
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(compat-defun json-serialize (object &rest args)
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"Return the JSON representation of OBJECT as a string.
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OBJECT must be t, a number, string, vector, hashtable, alist, plist,
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or the Lisp equivalents to the JSON null and false values, and its
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elements must recursively consist of the same kinds of values. t will
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be converted to the JSON true value. Vectors will be converted to
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JSON arrays, whereas hashtables, alists and plists are converted to
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JSON objects. Hashtable keys must be strings without embedded null
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characters and must be unique within each object. Alist and plist
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keys must be symbols; if a key is duplicate, the first instance is
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used.
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The Lisp equivalents to the JSON null and false values are
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configurable in the arguments ARGS, a list of keyword/argument pairs:
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The keyword argument `:null-object' specifies which object to use
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to represent a JSON null value. It defaults to `:null'.
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The keyword argument `:false-object' specifies which object to use to
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represent a JSON false value. It defaults to `:false'.
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In you specify the same value for `:null-object' and `:false-object',
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a potentially ambiguous situation, the JSON output will not contain
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any JSON false values."
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:cond (condition-case nil
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(let ((inhibit-message t))
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(equal (json-parse-string "[]") nil))
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(json-unavailable t)
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(void-function t))
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:realname compat--json-serialize
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(require 'json)
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(let ((json-false (or (plist-get args :false-object) :false))
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(json-null (or (plist-get args :null-object) :null)))
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(json-encode-string object)))
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(compat-defun json-insert (object &rest args)
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"Insert the JSON representation of OBJECT before point.
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This is the same as (insert (json-serialize OBJECT)), but potentially
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faster. See the function `json-serialize' for allowed values of
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OBJECT."
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:cond (condition-case nil
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(let ((inhibit-message t))
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(equal (json-parse-string "[]") nil))
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(json-unavailable t)
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(void-function t))
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(insert (apply #'compat--json-serialize object args)))
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(compat-defun json-parse-string (string &rest args)
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"Parse the JSON STRING into a Lisp object.
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This is essentially the reverse operation of `json-serialize', which
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see. The returned object will be the JSON null value, the JSON false
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value, t, a number, a string, a vector, a list, a hashtable, an alist,
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or a plist. Its elements will be further objects of these types. If
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there are duplicate keys in an object, all but the last one are
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ignored. If STRING doesn't contain a valid JSON object, this function
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signals an error of type `json-parse-error'.
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The arguments ARGS are a list of keyword/argument pairs:
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The keyword argument `:object-type' specifies which Lisp type is used
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to represent objects; it can be `hash-table', `alist' or `plist'. It
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defaults to `hash-table'.
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The keyword argument `:array-type' specifies which Lisp type is used
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to represent arrays; it can be `array' (the default) or `list'.
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The keyword argument `:null-object' specifies which object to use
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to represent a JSON null value. It defaults to `:null'.
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The keyword argument `:false-object' specifies which object to use to
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represent a JSON false value. It defaults to `:false'."
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:cond (condition-case nil
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(let ((inhibit-message t))
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(equal (json-parse-string "[]") nil))
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(json-unavailable t)
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(void-function t))
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(require 'json)
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(condition-case err
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(let ((json-object-type (or (plist-get args :object-type) 'hash-table))
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(json-array-type (or (plist-get args :array-type) 'vector))
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(json-false (or (plist-get args :false-object) :false))
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(json-null (or (plist-get args :null-object) :null)))
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(when (eq json-array-type 'array)
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(setq json-array-type 'vector))
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(json-read-from-string string))
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(json-error (signal 'json-parse-error err))))
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(compat-defun json-parse-buffer (&rest args)
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"Read JSON object from current buffer starting at point.
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Move point after the end of the object if parsing was successful.
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On error, don't move point.
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The returned object will be a vector, list, hashtable, alist, or
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plist. Its elements will be the JSON null value, the JSON false
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value, t, numbers, strings, or further vectors, lists, hashtables,
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alists, or plists. If there are duplicate keys in an object, all
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but the last one are ignored.
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If the current buffer doesn't contain a valid JSON object, the
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function signals an error of type `json-parse-error'.
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The arguments ARGS are a list of keyword/argument pairs:
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The keyword argument `:object-type' specifies which Lisp type is used
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to represent objects; it can be `hash-table', `alist' or `plist'. It
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defaults to `hash-table'.
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The keyword argument `:array-type' specifies which Lisp type is used
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to represent arrays; it can be `array' (the default) or `list'.
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The keyword argument `:null-object' specifies which object to use
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to represent a JSON null value. It defaults to `:null'.
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The keyword argument `:false-object' specifies which object to use to
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represent a JSON false value. It defaults to `:false'."
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:cond (condition-case nil
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(let ((inhibit-message t))
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(equal (json-parse-string "[]") nil))
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(json-unavailable t)
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(void-function t))
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(require 'json)
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(condition-case err
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(let ((json-object-type (or (plist-get args :object-type) 'hash-table))
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(json-array-type (or (plist-get args :array-type) 'vector))
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(json-false (or (plist-get args :false-object) :false))
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(json-null (or (plist-get args :null-object) :null)))
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(when (eq json-array-type 'array)
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(setq json-array-type 'vector))
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(json-read))
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(json-error (signal 'json-parse-buffer err))))
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;;;; Defined in timefns.c
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(compat-defun time-equal-p (t1 t2)
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"Return non-nil if time value T1 is equal to time value T2.
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A nil value for either argument stands for the current time."
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:note "This function is not as accurate as the actual `time-equal-p'."
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(cond
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((eq t1 t2))
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((and (consp t1) (consp t2))
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(equal t1 t2))
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((let ((now (current-time)))
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;; Due to inaccuracies and the relatively slow evaluating of
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;; Emacs Lisp compared to C, we allow for slight inaccuracies
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;; (less than a millisecond) when comparing time values.
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(< (abs (- (float-time (or t1 now))
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(float-time (or t2 now))))
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1e-5)))))
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;;;; Defined in subr.el
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(compat-defmacro setq-local (&rest pairs)
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"Handle multiple assignments."
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:prefix t
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(unless (zerop (mod (length pairs) 2))
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(error "PAIRS must have an even number of variable/value members"))
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(let (body)
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(while pairs
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(let* ((sym (pop pairs))
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(val (pop pairs)))
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(unless (symbolp sym)
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(error "Attempting to set a non-symbol: %s" (car pairs)))
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(push `(set (make-local-variable ,sym) ,val)
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body)))
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(cons 'progn (nreverse body))))
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;;* UNTESTED
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(compat-defmacro ignore-error (condition &rest body)
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"Execute BODY; if the error CONDITION occurs, return nil.
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Otherwise, return result of last form in BODY.
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CONDITION can also be a list of error conditions."
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(declare (debug t) (indent 1))
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`(condition-case nil (progn ,@body) (,condition nil)))
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;;* UNTESTED
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(compat-defmacro dolist-with-progress-reporter (spec reporter-or-message &rest body)
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"Loop over a list and report progress in the echo area.
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Evaluate BODY with VAR bound to each car from LIST, in turn.
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Then evaluate RESULT to get return value, default nil.
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REPORTER-OR-MESSAGE is a progress reporter object or a string. In the latter
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case, use this string to create a progress reporter.
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At each iteration, print the reporter message followed by progress
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percentage in the echo area. After the loop is finished,
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print the reporter message followed by the word \"done\".
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\(fn (VAR LIST [RESULT]) REPORTER-OR-MESSAGE BODY...)"
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(declare (indent 2) (debug ((symbolp form &optional form) form body)))
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(let ((prep (make-symbol "--dolist-progress-reporter--"))
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(count (make-symbol "--dolist-count--"))
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(list (make-symbol "--dolist-list--")))
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`(let ((,prep ,reporter-or-message)
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(,count 0)
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(,list ,(cadr spec)))
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(when (stringp ,prep)
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(setq ,prep (make-progress-reporter ,prep 0 (1- (length ,list)))))
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(dolist (,(car spec) ,list)
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,@body
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(progress-reporter-update ,prep (setq ,count (1+ ,count))))
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(progress-reporter-done ,prep)
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(or ,@(cdr (cdr spec)) nil))))
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(compat-defun flatten-tree (tree)
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"Return a \"flattened\" copy of TREE.
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In other words, return a list of the non-nil terminal nodes, or
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leaves, of the tree of cons cells rooted at TREE. Leaves in the
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returned list are in the same order as in TREE.
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\(flatten-tree \\='(1 (2 . 3) nil (4 5 (6)) 7))
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=> (1 2 3 4 5 6 7)"
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(let (elems)
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(while (consp tree)
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(let ((elem (pop tree)))
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(while (consp elem)
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(push (cdr elem) tree)
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(setq elem (car elem)))
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(if elem (push elem elems))))
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(if tree (push tree elems))
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(nreverse elems)))
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(compat-defun xor (cond1 cond2)
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"Return the boolean exclusive-or of COND1 and COND2.
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If only one of the arguments is non-nil, return it; otherwise
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return nil."
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(declare (pure t) (side-effect-free error-free))
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(cond ((not cond1) cond2)
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((not cond2) cond1)))
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(compat-defvar regexp-unmatchable "\\`a\\`"
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"Standard regexp guaranteed not to match any string at all."
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:constant t)
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(compat-defun assoc-delete-all (key alist &optional test)
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"Delete from ALIST all elements whose car is KEY.
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Compare keys with TEST. Defaults to `equal'.
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Return the modified alist.
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Elements of ALIST that are not conses are ignored."
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:prefix t
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(unless test (setq test #'equal))
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(while (and (consp (car alist))
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(funcall test (caar alist) key))
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(setq alist (cdr alist)))
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(let ((tail alist) tail-cdr)
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(while (setq tail-cdr (cdr tail))
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(if (and (consp (car tail-cdr))
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(funcall test (caar tail-cdr) key))
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(setcdr tail (cdr tail-cdr))
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(setq tail tail-cdr))))
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alist)
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;;;; Defined in simple.el
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;;* UNTESTED
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(compat-defun decoded-time-second (time)
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"The seconds in TIME, which is a value returned by `decode-time'.
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This is an integer between 0 and 60 (inclusive). (60 is a leap
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second, which only some operating systems support.)"
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(nth 0 time))
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;;* UNTESTED
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(compat-defun decoded-time-minute (time)
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"The minutes in TIME, which is a value returned by `decode-time'.
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This is an integer between 0 and 59 (inclusive)."
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(nth 1 time))
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;;* UNTESTED
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(compat-defun decoded-time-hour (time)
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"The hours in TIME, which is a value returned by `decode-time'.
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This is an integer between 0 and 23 (inclusive)."
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(nth 2 time))
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;;* UNTESTED
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(compat-defun decoded-time-day (time)
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"The day-of-the-month in TIME, which is a value returned by `decode-time'.
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This is an integer between 1 and 31 (inclusive)."
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(nth 3 time))
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;;* UNTESTED
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(compat-defun decoded-time-month (time)
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"The month in TIME, which is a value returned by `decode-time'.
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This is an integer between 1 and 12 (inclusive). January is 1."
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(nth 4 time))
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;;* UNTESTED
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(compat-defun decoded-time-year (time)
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"The year in TIME, which is a value returned by `decode-time'.
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This is a four digit integer."
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(nth 5 time))
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;;* UNTESTED
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(compat-defun decoded-time-weekday (time)
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"The day-of-the-week in TIME, which is a value returned by `decode-time'.
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This is a number between 0 and 6, and 0 is Sunday."
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(nth 6 time))
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;;* UNTESTED
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(compat-defun decoded-time-dst (time)
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"The daylight saving time in TIME, which is a value returned by `decode-time'.
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This is t if daylight saving time is in effect, and nil if not."
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(nth 7 time))
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;;* UNTESTED
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(compat-defun decoded-time-zone (time)
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"The time zone in TIME, which is a value returned by `decode-time'.
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This is an integer indicating the UTC offset in seconds, i.e.,
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the number of seconds east of Greenwich."
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(nth 8 time))
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;; TODO define gv-setters
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;;;; Defined in files.el
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(compat-defun file-size-human-readable (file-size &optional flavor space unit)
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"Handle the optional third and forth argument:
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Optional third argument SPACE is a string put between the number and unit.
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It defaults to the empty string. We recommend a single space or
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non-breaking space, unless other constraints prohibit a space in that
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position.
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Optional fourth argument UNIT is the unit to use. It defaults to \"B\"
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when FLAVOR is `iec' and the empty string otherwise. We recommend \"B\"
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in all cases, since that is the standard symbol for byte."
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:prefix t
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(let ((power (if (or (null flavor) (eq flavor 'iec))
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1024.0
|
||
1000.0))
|
||
(prefixes '("" "k" "M" "G" "T" "P" "E" "Z" "Y")))
|
||
(while (and (>= file-size power) (cdr prefixes))
|
||
(setq file-size (/ file-size power)
|
||
prefixes (cdr prefixes)))
|
||
(let* ((prefix (car prefixes))
|
||
(prefixed-unit (if (eq flavor 'iec)
|
||
(concat
|
||
(if (string= prefix "k") "K" prefix)
|
||
(if (string= prefix "") "" "i")
|
||
(or unit "B"))
|
||
(concat prefix unit))))
|
||
(format (if (and (>= (mod file-size 1.0) 0.05)
|
||
(< (mod file-size 1.0) 0.95))
|
||
"%.1f%s%s"
|
||
"%.0f%s%s")
|
||
file-size
|
||
(if (string= prefixed-unit "") "" (or space ""))
|
||
prefixed-unit))))
|
||
|
||
(declare-function compat--file-name-quote "compat-26"
|
||
(name &optional top))
|
||
|
||
;;*UNTESTED
|
||
(compat-defun exec-path ()
|
||
"Return list of directories to search programs to run in remote subprocesses.
|
||
The remote host is identified by `default-directory'. For remote
|
||
hosts that do not support subprocesses, this returns nil.
|
||
If `default-directory' is a local directory, this function returns
|
||
the value of the variable `exec-path'."
|
||
:realname compat--exec-path
|
||
(cond
|
||
((let ((handler (find-file-name-handler default-directory 'exec-path)))
|
||
;; FIXME: The handler was added in 27.1, and this compatibility
|
||
;; function only applies to versions of Emacs before that.
|
||
(when handler
|
||
(condition-case nil
|
||
(funcall handler 'exec-path)
|
||
(error nil)))))
|
||
((file-remote-p default-directory)
|
||
;; TODO: This is not completely portable, even if "sh" and
|
||
;; "getconf" should be provided on every POSIX system, the chance
|
||
;; of this not working are greater than zero.
|
||
;;
|
||
;; FIXME: This invokes a shell process every time exec-path is
|
||
;; called. It should instead be cached on a host-local basis.
|
||
(with-temp-buffer
|
||
(if (condition-case nil
|
||
(zerop (process-file "sh" nil t nil "-c" "getconf PATH"))
|
||
(file-missing t))
|
||
(list "/bin" "/usr/bin")
|
||
(let (path)
|
||
(while (re-search-forward "\\([^:]+?\\)[\n:]" nil t)
|
||
(push (match-string 1) path))
|
||
(nreverse path)))))
|
||
(exec-path)))
|
||
|
||
(declare-function compat--file-local-name "compat-26"
|
||
(file))
|
||
|
||
;;*UNTESTED
|
||
(compat-defun executable-find (command &optional remote)
|
||
"Search for COMMAND in `exec-path' and return the absolute file name.
|
||
Return nil if COMMAND is not found anywhere in `exec-path'. If
|
||
REMOTE is non-nil, search on the remote host indicated by
|
||
`default-directory' instead."
|
||
:prefix t
|
||
(if (and remote (file-remote-p default-directory))
|
||
(let ((res (locate-file
|
||
command
|
||
(mapcar
|
||
(apply-partially
|
||
#'concat (file-remote-p default-directory))
|
||
(compat--exec-path))
|
||
exec-suffixes 'file-executable-p)))
|
||
(when (stringp res) (compat--file-local-name res)))
|
||
(executable-find command)))
|
||
|
||
;; TODO provide advice for directory-files-recursively
|
||
|
||
;;;; Defined in format-spec.el
|
||
|
||
;; TODO provide advice for format-spec
|
||
|
||
;;;; Defined in regexp-opt.el
|
||
|
||
(compat-defun regexp-opt (strings &optional paren)
|
||
"Handle an empty list of strings."
|
||
:prefix t
|
||
(if (null strings)
|
||
(let ((re "\\`a\\`"))
|
||
(cond ((null paren)
|
||
(concat "\\(?:" re "\\)"))
|
||
((stringp paren)
|
||
(concat paren re "\\)"))
|
||
((eq paren 'words)
|
||
(concat "\\<\\(" re "\\)\\>"))
|
||
((eq paren 'symbols)
|
||
(concat "\\_\\(<" re "\\)\\_>"))
|
||
((concat "\\(" re "\\)"))))
|
||
(regexp-opt strings paren)))
|
||
|
||
;;;; Defined in package.el
|
||
|
||
(declare-function lm-header "lisp-mnt")
|
||
|
||
;;* UNTESTED
|
||
(compat-defun package-get-version ()
|
||
"Return the version number of the package in which this is used.
|
||
Assumes it is used from an Elisp file placed inside the top-level directory
|
||
of an installed ELPA package.
|
||
The return value is a string (or nil in case we can’t find it)."
|
||
;; In a sense, this is a lie, but it does just what we want: precompute
|
||
;; the version at compile time and hardcodes it into the .elc file!
|
||
(declare (pure t))
|
||
;; Hack alert!
|
||
(let ((file
|
||
(or (and (boundp 'byte-compile-current-file) byte-compile-current-file)
|
||
load-file-name
|
||
buffer-file-name)))
|
||
(cond
|
||
((null file) nil)
|
||
;; Packages are normally installed into directories named "<pkg>-<vers>",
|
||
;; so get the version number from there.
|
||
((string-match
|
||
"/[^/]+-\\([0-9]\\(?:[0-9.]\\|pre\\|beta\\|alpha\\|snapshot\\)+\\)/[^/]+\\'"
|
||
file)
|
||
(match-string 1 file))
|
||
;; For packages run straight from the an elpa.git clone, there's no
|
||
;; "-<vers>" in the directory name, so we have to fetch the version
|
||
;; the hard way.
|
||
((let* ((pkgdir (file-name-directory file))
|
||
(pkgname (file-name-nondirectory (directory-file-name pkgdir)))
|
||
(mainfile (expand-file-name (concat pkgname ".el") pkgdir)))
|
||
(when (file-readable-p mainfile)
|
||
(require 'lisp-mnt)
|
||
(with-temp-buffer
|
||
(insert-file-contents mainfile)
|
||
(or (lm-header "package-version")
|
||
(lm-header "version")))))))))
|
||
|
||
|
||
;;;; Defined in dired.el
|
||
|
||
(declare-function
|
||
dired-get-marked-files "dired.el"
|
||
(&optional localp arg filter distinguish-one-marked error))
|
||
|
||
;;* UNTESTED
|
||
(compat-defun dired-get-marked-files
|
||
(&optional localp arg filter distinguish-one-marked error)
|
||
"Return the marked files’ names as list of strings."
|
||
:feature 'dired
|
||
:prefix t
|
||
(let ((result (dired-get-marked-files localp arg filter distinguish-one-marked)))
|
||
(if (and (null result) error)
|
||
(user-error (if (stringp error) error "No files specified"))
|
||
result)))
|
||
|
||
;;;; Defined in time-date.el
|
||
|
||
(compat-defun date-days-in-month (year month)
|
||
"The number of days in MONTH in YEAR."
|
||
:feature 'time-date
|
||
(unless (and (numberp month)
|
||
(<= 1 month)
|
||
(<= month 12))
|
||
(error "Month %s is invalid" month))
|
||
(if (= month 2)
|
||
(if (date-leap-year-p year)
|
||
29
|
||
28)
|
||
(if (memq month '(1 3 5 7 8 10 12))
|
||
31
|
||
30)))
|
||
|
||
(provide 'compat-27)
|
||
;;; compat-27.el ends here
|