624 lines
22 KiB
EmacsLisp
624 lines
22 KiB
EmacsLisp
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;;; compat-26.el --- Compatibility Layer for Emacs 26.1 -*- 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 26.1, 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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(declare-function compat-func-arity "compat" (func))
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;;;; Defined in eval.c
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(compat-defun func-arity (func)
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"Return minimum and maximum number of args allowed for FUNC.
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FUNC must be a function of some kind.
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The returned value is a cons cell (MIN . MAX). MIN is the minimum number
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of args. MAX is the maximum number, or the symbol ‘many’, for a
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function with ‘&rest’ args, or ‘unevalled’ for a special form."
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:realname compat--func-arity
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(cond
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((or (null func) (and (symbolp func) (not (fboundp func))))
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(signal 'void-function func))
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((and (symbolp func) (not (null func)))
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(compat--func-arity (symbol-function func)))
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((eq (car-safe func) 'macro)
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(compat--func-arity (cdr func)))
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((subrp func)
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(subr-arity func))
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((memq (car-safe func) '(closure lambda))
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;; See lambda_arity from eval.c
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(when (eq (car func) 'closure)
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(setq func (cdr func)))
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(let ((syms-left (if (consp func)
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(car func)
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(signal 'invalid-function func)))
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(min-args 0) (max-args 0) optional)
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(catch 'many
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(dolist (next syms-left)
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(cond
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((not (symbolp next))
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(signal 'invalid-function func))
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((eq next '&rest)
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(throw 'many (cons min-args 'many)))
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((eq next '&optional)
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(setq optional t))
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(t (unless optional
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(setq min-args (1+ min-args)))
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(setq max-args (1+ max-args)))))
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(cons min-args max-args))))
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((and (byte-code-function-p func) (numberp (aref func 0)))
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;; See get_byte_code_arity from bytecode.c
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(let ((at (aref func 0)))
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(cons (logand at 127)
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(if (= (logand at 128) 0)
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(ash at -8)
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'many))))
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((and (byte-code-function-p func) (numberp (aref func 0)))
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;; See get_byte_code_arity from bytecode.c
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(let ((at (aref func 0)))
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(cons (logand at 127)
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(if (= (logand at 128) 0)
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(ash at -8)
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'many))))
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((and (byte-code-function-p func) (listp (aref func 0)))
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;; Based on `byte-compile-make-args-desc', this is required for
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;; old versions of Emacs that don't use a integer for the argument
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;; list description, per e2abe5a13dffb08d6371b6a611bc39c3a9ac2bc6.
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(let ((arglist (aref func 0)) (mandatory 0) nonrest)
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(while (and arglist (not (memq (car arglist) '(&optional &rest))))
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(setq mandatory (1+ mandatory))
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(setq arglist (cdr arglist)))
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(setq nonrest mandatory)
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(when (eq (car arglist) '&optional)
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(setq arglist (cdr arglist))
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(while (and arglist (not (eq (car arglist) '&rest)))
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(setq nonrest (1+ nonrest))
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(setq arglist (cdr arglist))))
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(cons mandatory (if arglist 'many nonrest))))
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((autoloadp func)
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(autoload-do-load func)
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(compat--func-arity func))
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((signal 'invalid-function func))))
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;;;; Defined in fns.c
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(compat-defun assoc (key alist &optional testfn)
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"Handle the optional argument TESTFN.
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Equality is defined by the function TESTFN, defaulting to
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‘equal’. TESTFN is called with 2 arguments: a car of an alist
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element and KEY. With no optional argument, the function behaves
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just like `assoc'."
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:prefix t
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(if testfn
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(catch 'found
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(dolist (ent alist)
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(when (funcall testfn (car ent) key)
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(throw 'found ent))))
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(assoc key alist)))
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(compat-defun mapcan (func sequence)
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"Apply FUNC to each element of SEQUENCE.
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Concatenate the results by altering them (using `nconc').
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SEQUENCE may be a list, a vector, a boolean vector, or a string."
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(apply #'nconc (mapcar func sequence)))
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;;* UNTESTED
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(compat-defun line-number-at-pos (&optional position absolute)
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"Handle optional argument ABSOLUTE:
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If the buffer is narrowed, the return value by default counts the lines
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from the beginning of the accessible portion of the buffer. But if the
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second optional argument ABSOLUTE is non-nil, the value counts the lines
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from the absolute start of the buffer, disregarding the narrowing."
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:prefix t
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(if absolute
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(save-restriction
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(widen)
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(line-number-at-pos position))
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(line-number-at-pos position)))
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;;;; Defined in subr.el
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(declare-function compat--alist-get-full-elisp "compat-25"
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(key alist &optional default remove testfn))
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(compat-defun alist-get (key alist &optional default remove testfn)
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"Handle TESTFN manually."
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:realname compat--alist-get-handle-testfn
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:prefix t
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(if testfn
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(compat--alist-get-full-elisp key alist default remove testfn)
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(alist-get key alist default remove)))
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(gv-define-expander compat-alist-get
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(lambda (do key alist &optional default remove testfn)
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(macroexp-let2 macroexp-copyable-p k key
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(gv-letplace (getter setter) alist
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(macroexp-let2 nil p `(if (and ,testfn (not (eq ,testfn 'eq)))
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(compat-assoc ,k ,getter ,testfn)
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(assq ,k ,getter))
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(funcall do (if (null default) `(cdr ,p)
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`(if ,p (cdr ,p) ,default))
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(lambda (v)
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(macroexp-let2 nil v v
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(let ((set-exp
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`(if ,p (setcdr ,p ,v)
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,(funcall setter
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`(cons (setq ,p (cons ,k ,v))
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,getter)))))
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`(progn
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,(cond
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((null remove) set-exp)
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((or (eql v default)
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(and (eq (car-safe v) 'quote)
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(eq (car-safe default) 'quote)
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(eql (cadr v) (cadr default))))
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`(if ,p ,(funcall setter `(delq ,p ,getter))))
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(t
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`(cond
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((not (eql ,default ,v)) ,set-exp)
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(,p ,(funcall setter
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`(delq ,p ,getter))))))
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,v))))))))))
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(compat-defun string-trim-left (string &optional regexp)
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"Trim STRING of leading string matching REGEXP.
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REGEXP defaults to \"[ \\t\\n\\r]+\"."
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:realname compat--string-trim-left
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:prefix t
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(if (string-match (concat "\\`\\(?:" (or regexp "[ \t\n\r]+") "\\)") string)
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(substring string (match-end 0))
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string))
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(compat-defun string-trim-right (string &optional regexp)
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"Trim STRING of trailing string matching REGEXP.
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REGEXP defaults to \"[ \\t\\n\\r]+\"."
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:realname compat--string-trim-right
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:prefix t
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(let ((i (string-match-p
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(concat "\\(?:" (or regexp "[ \t\n\r]+") "\\)\\'")
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string)))
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(if i (substring string 0 i) string)))
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(compat-defun string-trim (string &optional trim-left trim-right)
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"Trim STRING of leading with and trailing matching TRIM-LEFT and TRIM-RIGHT.
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TRIM-LEFT and TRIM-RIGHT default to \"[ \\t\\n\\r]+\"."
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:prefix t
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;; `string-trim-left' and `string-trim-right' were moved from subr-x
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;; to subr in Emacs 27, so to avoid loading subr-x we use the
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;; compatibility function here:
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(compat--string-trim-left
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(compat--string-trim-right
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string
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trim-right)
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trim-left))
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(compat-defun caaar (x)
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"Return the `car' of the `car' of the `car' of X."
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(declare (pure t))
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(car (car (car x))))
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(compat-defun caadr (x)
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"Return the `car' of the `car' of the `cdr' of X."
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(declare (pure t))
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(car (car (cdr x))))
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(compat-defun cadar (x)
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"Return the `car' of the `cdr' of the `car' of X."
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(declare (pure t))
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(car (cdr (car x))))
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(compat-defun caddr (x)
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"Return the `car' of the `cdr' of the `cdr' of X."
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(declare (pure t))
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(car (cdr (cdr x))))
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(compat-defun cdaar (x)
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"Return the `cdr' of the `car' of the `car' of X."
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(declare (pure t))
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(cdr (car (car x))))
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(compat-defun cdadr (x)
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"Return the `cdr' of the `car' of the `cdr' of X."
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(declare (pure t))
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(cdr (car (cdr x))))
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(compat-defun cddar (x)
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"Return the `cdr' of the `cdr' of the `car' of X."
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(declare (pure t))
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(cdr (cdr (car x))))
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(compat-defun cdddr (x)
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"Return the `cdr' of the `cdr' of the `cdr' of X."
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(declare (pure t))
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(cdr (cdr (cdr x))))
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(compat-defun caaaar (x)
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"Return the `car' of the `car' of the `car' of the `car' of X."
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(declare (pure t))
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(car (car (car (car x)))))
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(compat-defun caaadr (x)
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"Return the `car' of the `car' of the `car' of the `cdr' of X."
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(declare (pure t))
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(car (car (car (cdr x)))))
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(compat-defun caadar (x)
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"Return the `car' of the `car' of the `cdr' of the `car' of X."
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(declare (pure t))
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(car (car (cdr (car x)))))
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(compat-defun caaddr (x)
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"Return the `car' of the `car' of the `cdr' of the `cdr' of X."
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(declare (pure t))
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(car (car (cdr (cdr x)))))
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(compat-defun cadaar (x)
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"Return the `car' of the `cdr' of the `car' of the `car' of X."
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(declare (pure t))
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(car (cdr (car (car x)))))
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(compat-defun cadadr (x)
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"Return the `car' of the `cdr' of the `car' of the `cdr' of X."
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(declare (pure t))
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(car (cdr (car (cdr x)))))
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(compat-defun caddar (x)
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"Return the `car' of the `cdr' of the `cdr' of the `car' of X."
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(declare (pure t))
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(car (cdr (cdr (car x)))))
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(compat-defun cadddr (x)
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"Return the `car' of the `cdr' of the `cdr' of the `cdr' of X."
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(declare (pure t))
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(car (cdr (cdr (cdr x)))))
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(compat-defun cdaaar (x)
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"Return the `cdr' of the `car' of the `car' of the `car' of X."
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(declare (pure t))
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(cdr (car (car (car x)))))
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(compat-defun cdaadr (x)
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"Return the `cdr' of the `car' of the `car' of the `cdr' of X."
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(declare (pure t))
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(cdr (car (car (cdr x)))))
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(compat-defun cdadar (x)
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"Return the `cdr' of the `car' of the `cdr' of the `car' of X."
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(declare (pure t))
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(cdr (car (cdr (car x)))))
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(compat-defun cdaddr (x)
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"Return the `cdr' of the `car' of the `cdr' of the `cdr' of X."
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(declare (pure t))
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(cdr (car (cdr (cdr x)))))
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(compat-defun cddaar (x)
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"Return the `cdr' of the `cdr' of the `car' of the `car' of X."
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(declare (pure t))
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(cdr (cdr (car (car x)))))
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(compat-defun cddadr (x)
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"Return the `cdr' of the `cdr' of the `car' of the `cdr' of X."
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|||
|
|
(declare (pure t))
|
|||
|
|
(cdr (cdr (car (cdr x)))))
|
|||
|
|
|
|||
|
|
(compat-defun cdddar (x)
|
|||
|
|
"Return the `cdr' of the `cdr' of the `cdr' of the `car' of X."
|
|||
|
|
(declare (pure t))
|
|||
|
|
(cdr (cdr (cdr (car x)))))
|
|||
|
|
|
|||
|
|
(compat-defun cddddr (x)
|
|||
|
|
"Return the `cdr' of the `cdr' of the `cdr' of the `cdr' of X."
|
|||
|
|
(declare (pure t))
|
|||
|
|
(cdr (cdr (cdr (cdr x)))))
|
|||
|
|
|
|||
|
|
(compat-defvar gensym-counter 0
|
|||
|
|
"Number used to construct the name of the next symbol created by `gensym'.")
|
|||
|
|
|
|||
|
|
(compat-defun gensym (&optional prefix)
|
|||
|
|
"Return a new uninterned symbol.
|
|||
|
|
The name is made by appending `gensym-counter' to PREFIX.
|
|||
|
|
PREFIX is a string, and defaults to \"g\"."
|
|||
|
|
(let ((num (prog1 gensym-counter
|
|||
|
|
(setq gensym-counter
|
|||
|
|
(1+ gensym-counter)))))
|
|||
|
|
(make-symbol (format "%s%d" (or prefix "g") num))))
|
|||
|
|
|
|||
|
|
;;;; Defined in files.el
|
|||
|
|
|
|||
|
|
(declare-function temporary-file-directory nil)
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun make-nearby-temp-file (prefix &optional dir-flag suffix)
|
|||
|
|
"Create a temporary file as close as possible to `default-directory'.
|
|||
|
|
If PREFIX is a relative file name, and `default-directory' is a
|
|||
|
|
remote file name or located on a mounted file systems, the
|
|||
|
|
temporary file is created in the directory returned by the
|
|||
|
|
function `temporary-file-directory'. Otherwise, the function
|
|||
|
|
`make-temp-file' is used. PREFIX, DIR-FLAG and SUFFIX have the
|
|||
|
|
same meaning as in `make-temp-file'."
|
|||
|
|
(let ((handler (find-file-name-handler
|
|||
|
|
default-directory 'make-nearby-temp-file)))
|
|||
|
|
(if (and handler (not (file-name-absolute-p default-directory)))
|
|||
|
|
(funcall handler 'make-nearby-temp-file prefix dir-flag suffix)
|
|||
|
|
(let ((temporary-file-directory (temporary-file-directory)))
|
|||
|
|
(make-temp-file prefix dir-flag suffix)))))
|
|||
|
|
|
|||
|
|
(compat-defvar mounted-file-systems
|
|||
|
|
(eval-when-compile
|
|||
|
|
(if (memq system-type '(windows-nt cygwin))
|
|||
|
|
"^//[^/]+/"
|
|||
|
|
(concat
|
|||
|
|
"^" (regexp-opt '("/afs/" "/media/" "/mnt" "/net/" "/tmp_mnt/")))))
|
|||
|
|
"File systems that ought to be mounted.")
|
|||
|
|
|
|||
|
|
(compat-defun file-local-name (file)
|
|||
|
|
"Return the local name component of FILE.
|
|||
|
|
This function removes from FILE the specification of the remote host
|
|||
|
|
and the method of accessing the host, leaving only the part that
|
|||
|
|
identifies FILE locally on the remote system.
|
|||
|
|
The returned file name can be used directly as argument of
|
|||
|
|
`process-file', `start-file-process', or `shell-command'."
|
|||
|
|
:realname compat--file-local-name
|
|||
|
|
(or (file-remote-p file 'localname) file))
|
|||
|
|
|
|||
|
|
(compat-defun file-name-quoted-p (name &optional top)
|
|||
|
|
"Whether NAME is quoted with prefix \"/:\".
|
|||
|
|
If NAME is a remote file name and TOP is nil, check the local part of NAME."
|
|||
|
|
:realname compat--file-name-quoted-p
|
|||
|
|
(let ((file-name-handler-alist (unless top file-name-handler-alist)))
|
|||
|
|
(string-prefix-p "/:" (compat--file-local-name name))))
|
|||
|
|
|
|||
|
|
(compat-defun file-name-quote (name &optional top)
|
|||
|
|
"Add the quotation prefix \"/:\" to file NAME.
|
|||
|
|
If NAME is a remote file name and TOP is nil, the local part of
|
|||
|
|
NAME is quoted. If NAME is already a quoted file name, NAME is
|
|||
|
|
returned unchanged."
|
|||
|
|
(let ((file-name-handler-alist (unless top file-name-handler-alist)))
|
|||
|
|
(if (compat--file-name-quoted-p name top)
|
|||
|
|
name
|
|||
|
|
(concat (file-remote-p name) "/:" (compat--file-local-name name)))))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun temporary-file-directory ()
|
|||
|
|
"The directory for writing temporary files.
|
|||
|
|
In case of a remote `default-directory', this is a directory for
|
|||
|
|
temporary files on that remote host. If such a directory does
|
|||
|
|
not exist, or `default-directory' ought to be located on a
|
|||
|
|
mounted file system (see `mounted-file-systems'), the function
|
|||
|
|
returns `default-directory'.
|
|||
|
|
For a non-remote and non-mounted `default-directory', the value of
|
|||
|
|
the variable `temporary-file-directory' is returned."
|
|||
|
|
(let ((handler (find-file-name-handler
|
|||
|
|
default-directory 'temporary-file-directory)))
|
|||
|
|
(if handler
|
|||
|
|
(funcall handler 'temporary-file-directory)
|
|||
|
|
(if (string-match mounted-file-systems default-directory)
|
|||
|
|
default-directory
|
|||
|
|
temporary-file-directory))))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-type (attributes)
|
|||
|
|
"The type field in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
The value is either t for directory, string (name linked to) for
|
|||
|
|
symbolic link, or nil."
|
|||
|
|
(nth 0 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-link-number (attributes)
|
|||
|
|
"Return the number of links in ATTRIBUTES returned by `file-attributes'."
|
|||
|
|
(nth 1 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-user-id (attributes)
|
|||
|
|
"The UID field in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
This is either a string or a number. If a string value cannot be
|
|||
|
|
looked up, a numeric value, either an integer or a float, is
|
|||
|
|
returned."
|
|||
|
|
(nth 2 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-group-id (attributes)
|
|||
|
|
"The GID field in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
This is either a string or a number. If a string value cannot be
|
|||
|
|
looked up, a numeric value, either an integer or a float, is
|
|||
|
|
returned."
|
|||
|
|
(nth 3 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-access-time (attributes)
|
|||
|
|
"The last access time in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
This a Lisp timestamp in the style of `current-time'."
|
|||
|
|
(nth 4 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-modification-time (attributes)
|
|||
|
|
"The modification time in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
This is the time of the last change to the file's contents, and
|
|||
|
|
is a Lisp timestamp in the style of `current-time'."
|
|||
|
|
(nth 5 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-status-change-time (attributes)
|
|||
|
|
"The status modification time in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
This is the time of last change to the file's attributes: owner
|
|||
|
|
and group, access mode bits, etc., and is a Lisp timestamp in the
|
|||
|
|
style of `current-time'."
|
|||
|
|
(nth 6 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-size (attributes)
|
|||
|
|
"The integer size (in bytes) in ATTRIBUTES returned by `file-attributes'."
|
|||
|
|
(nth 7 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-modes (attributes)
|
|||
|
|
"The file modes in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
This is a string of ten letters or dashes as in ls -l."
|
|||
|
|
(nth 8 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-inode-number (attributes)
|
|||
|
|
"The inode number in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
It is a nonnegative integer."
|
|||
|
|
(nth 10 attributes))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun file-attribute-device-number (attributes)
|
|||
|
|
"The file system device number in ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
It is an integer."
|
|||
|
|
(nth 11 attributes))
|
|||
|
|
|
|||
|
|
(compat-defun file-attribute-collect (attributes &rest attr-names)
|
|||
|
|
"Return a sublist of ATTRIBUTES returned by `file-attributes'.
|
|||
|
|
ATTR-NAMES are symbols with the selected attribute names.
|
|||
|
|
|
|||
|
|
Valid attribute names are: type, link-number, user-id, group-id,
|
|||
|
|
access-time, modification-time, status-change-time, size, modes,
|
|||
|
|
inode-number and device-number."
|
|||
|
|
(let ((idx '((type . 0)
|
|||
|
|
(link-number . 1)
|
|||
|
|
(user-id . 2)
|
|||
|
|
(group-id . 3)
|
|||
|
|
(access-time . 4)
|
|||
|
|
(modification-time . 5)
|
|||
|
|
(status-change-time . 6)
|
|||
|
|
(size . 7)
|
|||
|
|
(modes . 8)
|
|||
|
|
(inode-number . 10)
|
|||
|
|
(device-number . 11)))
|
|||
|
|
result)
|
|||
|
|
(while attr-names
|
|||
|
|
(let ((attr (pop attr-names)))
|
|||
|
|
(if (assq attr idx)
|
|||
|
|
(push (nth (cdr (assq attr idx))
|
|||
|
|
attributes)
|
|||
|
|
result)
|
|||
|
|
(error "Wrong attribute name '%S'" attr))))
|
|||
|
|
(nreverse result)))
|
|||
|
|
|
|||
|
|
;;;; Defined in subr-x.el
|
|||
|
|
|
|||
|
|
(compat-defmacro if-let* (varlist then &rest else)
|
|||
|
|
"Bind variables according to VARLIST and evaluate THEN or ELSE.
|
|||
|
|
This is like `if-let' but doesn't handle a VARLIST of the form
|
|||
|
|
\(SYMBOL SOMETHING) specially."
|
|||
|
|
:realname compat--if-let*
|
|||
|
|
:feature 'subr-x
|
|||
|
|
(declare (indent 2)
|
|||
|
|
(debug ((&rest [&or symbolp (symbolp form) (form)])
|
|||
|
|
body)))
|
|||
|
|
(let ((empty (make-symbol "s"))
|
|||
|
|
(last t) list)
|
|||
|
|
(dolist (var varlist)
|
|||
|
|
(push `(,(if (cdr var) (car var) empty)
|
|||
|
|
(and ,last ,(or (cadr var) (car var))))
|
|||
|
|
list)
|
|||
|
|
(when (or (cdr var) (consp (car var)))
|
|||
|
|
(setq last (caar list))))
|
|||
|
|
`(let* ,(nreverse list)
|
|||
|
|
(if ,(caar list) ,then ,@else))))
|
|||
|
|
|
|||
|
|
(compat-defmacro when-let* (varlist &rest body)
|
|||
|
|
"Bind variables according to VARLIST and conditionally evaluate BODY.
|
|||
|
|
This is like `when-let' but doesn't handle a VARLIST of the form
|
|||
|
|
\(SYMBOL SOMETHING) specially."
|
|||
|
|
;; :feature 'subr-x
|
|||
|
|
(declare (indent 1) (debug if-let*))
|
|||
|
|
(let ((empty (make-symbol "s"))
|
|||
|
|
(last t) list)
|
|||
|
|
(dolist (var varlist)
|
|||
|
|
(push `(,(if (cdr var) (car var) empty)
|
|||
|
|
(and ,last ,(or (cadr var) (car var))))
|
|||
|
|
list)
|
|||
|
|
(when (or (cdr var) (consp (car var)))
|
|||
|
|
(setq last (caar list))))
|
|||
|
|
`(let* ,(nreverse list)
|
|||
|
|
(when ,(caar list) ,@body))))
|
|||
|
|
|
|||
|
|
(compat-defmacro and-let* (varlist &rest body)
|
|||
|
|
"Bind variables according to VARLIST and conditionally evaluate BODY.
|
|||
|
|
Like `when-let*', except if BODY is empty and all the bindings
|
|||
|
|
are non-nil, then the result is non-nil."
|
|||
|
|
:feature 'subr-x
|
|||
|
|
(declare (indent 1) (debug if-let*))
|
|||
|
|
(let ((empty (make-symbol "s"))
|
|||
|
|
(last t) list)
|
|||
|
|
(dolist (var varlist)
|
|||
|
|
(push `(,(if (cdr var) (car var) empty)
|
|||
|
|
(and ,last ,(or (cadr var) (car var))))
|
|||
|
|
list)
|
|||
|
|
(when (or (cdr var) (consp (car var)))
|
|||
|
|
(setq last (caar list))))
|
|||
|
|
`(let* ,(nreverse list)
|
|||
|
|
(if ,(caar list) ,(macroexp-progn (or body '(t)))))))
|
|||
|
|
|
|||
|
|
;;;; Defined in image.el
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(compat-defun image-property (image property)
|
|||
|
|
"Return the value of PROPERTY in IMAGE.
|
|||
|
|
Properties can be set with
|
|||
|
|
|
|||
|
|
(setf (image-property IMAGE PROPERTY) VALUE)
|
|||
|
|
|
|||
|
|
If VALUE is nil, PROPERTY is removed from IMAGE."
|
|||
|
|
(plist-get (cdr image) property))
|
|||
|
|
|
|||
|
|
;;* UNTESTED
|
|||
|
|
(unless (get 'image-property 'gv-expander)
|
|||
|
|
(gv-define-setter image-property (image property value)
|
|||
|
|
(let ((image* (make-symbol "image"))
|
|||
|
|
(property* (make-symbol "property"))
|
|||
|
|
(value* (make-symbol "value")))
|
|||
|
|
`(let ((,image* ,image)
|
|||
|
|
(,property* ,property)
|
|||
|
|
(,value* ,value))
|
|||
|
|
(if
|
|||
|
|
(null ,value*)
|
|||
|
|
(while
|
|||
|
|
(cdr ,image*)
|
|||
|
|
(if
|
|||
|
|
(eq
|
|||
|
|
(cadr ,image*)
|
|||
|
|
,property*)
|
|||
|
|
(setcdr ,image*
|
|||
|
|
(cdddr ,image*))
|
|||
|
|
(setq ,image*
|
|||
|
|
(cddr ,image*))))
|
|||
|
|
(setcdr ,image*
|
|||
|
|
(plist-put
|
|||
|
|
(cdr ,image*)
|
|||
|
|
,property* ,value*)))))))
|
|||
|
|
|
|||
|
|
(provide 'compat-26)
|
|||
|
|
;;; compat-26.el ends here
|