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+;;; erc-compat.el --- ERC compatibility code for older Emacsen  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2002-2003, 2005-2021 Free Software Foundation, Inc.
+
+;; Author: Alex Schroeder <alex@gnu.org>
+;; Maintainer: Amin Bandali <bandali@gnu.org>
+;; URL: https://www.emacswiki.org/emacs/ERC
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This mostly defines stuff that cannot be worked around easily.
+
+;;; Code:
+
+;;;###autoload(autoload 'erc-define-minor-mode "erc-compat")
+(define-obsolete-function-alias 'erc-define-minor-mode
+  #'define-minor-mode "28.1")
+
+(defun erc-decode-coding-string (s coding-system)
+  "Decode S using CODING-SYSTEM."
+  (declare (obsolete decode-coding-string "28.1"))
+  (decode-coding-string s coding-system t))
+
+(defun erc-encode-coding-string (s coding-system)
+  "Encode S using CODING-SYSTEM.
+Return the same string, if the encoding operation is trivial.
+See `erc-encoding-coding-alist'."
+  (declare (obsolete encode-coding-string "28.1"))
+  (encode-coding-string s coding-system t))
+
+(define-obsolete-function-alias 'erc-propertize #'propertize "28.1")
+(define-obsolete-function-alias 'erc-view-mode-enter #'view-mode-enter "28.1")
+(autoload 'help-function-arglist "help-fns")
+(define-obsolete-function-alias 'erc-function-arglist #'help-function-arglist "28.1")
+(define-obsolete-function-alias 'erc-delete-dups #'delete-dups "28.1")
+(define-obsolete-function-alias 'erc-replace-regexp-in-string #'replace-regexp-in-string "28.1")
+
+(defun erc-set-write-file-functions (new-val)
+  (declare (obsolete nil "28.1"))
+  (set (make-local-variable 'write-file-functions) new-val))
+
+(defvar erc-emacs-build-time
+  (if (or (stringp emacs-build-time) (not emacs-build-time))
+      emacs-build-time
+    (format-time-string "%Y-%m-%d" emacs-build-time))
+  "Time at which Emacs was dumped out, or nil if not available.")
+(make-obsolete-variable 'erc-emacs-build-time 'emacs-build-time "28.1")
+(define-obsolete-variable-alias 'erc-user-emacs-directory 'user-emacs-directory "28.1")
+
+(defun erc-replace-match-subexpression-in-string
+  (newtext string _match subexp _start &optional fixedcase literal)
+  "Replace the subexpression SUBEXP of the last match in STRING with NEWTEXT.
+MATCH is the text which matched the subexpression (see `match-string').
+START is the beginning position of the last match (see `match-beginning').
+See `replace-match' for explanations of FIXEDCASE and LITERAL."
+  (declare (obsolete replace-match "28.1"))
+  (replace-match newtext fixedcase literal string subexp))
+
+(define-obsolete-function-alias 'erc-with-selected-window
+  #'with-selected-window "28.1")
+(define-obsolete-function-alias 'erc-cancel-timer #'cancel-timer "28.1")
+(define-obsolete-function-alias 'erc-make-obsolete #'make-obsolete "28.1")
+(define-obsolete-function-alias 'erc-make-obsolete-variable
+  #'make-obsolete-variable "28.1")
+
+;; Provide a simpler replacement for `cl-member-if'
+(defun erc-member-if (predicate list)
+  "Find the first item satisfying PREDICATE in LIST.
+Return the sublist of LIST whose car matches."
+  (declare (obsolete cl-member-if "28.1"))
+  (let ((ptr list))
+    (catch 'found
+      (while ptr
+	(when (funcall predicate (car ptr))
+	  (throw 'found ptr))
+	(setq ptr (cdr ptr))))))
+
+;; Provide a simpler replacement for `cl-delete-if'
+(defun erc-delete-if (predicate seq)
+  "Remove all items satisfying PREDICATE in SEQ.
+This is a destructive function: it reuses the storage of SEQ
+whenever possible."
+  (declare (obsolete cl-delete-if "28.1"))
+  ;; remove from car
+  (while (when (funcall predicate (car seq))
+	   (setq seq (cdr seq))))
+  ;; remove from cdr
+  (let ((ptr seq)
+	(next (cdr seq)))
+    (while next
+      (when (funcall predicate (car next))
+	(setcdr ptr (if (consp next)
+			(cdr next)
+		      nil)))
+      (setq ptr (cdr ptr))
+      (setq next (cdr ptr))))
+  seq)
+
+;; Provide a simpler replacement for `cl-remove-if-not'
+(defun erc-remove-if-not (predicate seq)
+  "Remove all items not satisfying PREDICATE in SEQ.
+This is a non-destructive function; it makes a copy of SEQ to
+avoid corrupting the original SEQ."
+  (declare (obsolete cl-remove-if-not "28.1"))
+  (let (newseq)
+    (dolist (el seq)
+      (when (funcall predicate el)
+	(setq newseq (cons el newseq))))
+    (nreverse newseq)))
+
+;; Copied from cl-extra.el
+(defun erc-subseq (seq start &optional end)
+  "Return the subsequence of SEQ from START to END.
+If END is omitted, it defaults to the length of the sequence.
+If START or END is negative, it counts from the end."
+  (declare (obsolete cl-subseq "28.1"))
+  (if (stringp seq) (substring seq start end)
+    (let (len)
+      (and end (< end 0) (setq end (+ end (setq len (length seq)))))
+      (if (< start 0) (setq start (+ start (or len (setq len (length seq))))))
+      (cond ((listp seq)
+	     (if (> start 0) (setq seq (nthcdr start seq)))
+	     (if end
+		 (let ((res nil))
+		   (while (>= (setq end (1- end)) start)
+		     (push (pop seq) res))
+		   (nreverse res))
+	       (copy-sequence seq)))
+	    (t
+	     (or end (setq end (or len (length seq))))
+	     (let ((res (make-vector (max (- end start) 0) nil))
+		   (i 0))
+	       (while (< start end)
+		 (aset res i (aref seq start))
+		 (setq i (1+ i) start (1+ start)))
+	       res))))))
+
+(provide 'erc-compat)
+
+;;; erc-compat.el ends here
+;;
+;; Local Variables:
+;; generated-autoload-file: "erc-loaddefs.el"
+;; End: