(require 'format-spec)
(defalias 'erc-define-minor-mode 'define-minor-mode)
(put 'erc-define-minor-mode 'edebug-form-spec 'define-minor-mode)
(defun erc-decode-coding-string (s coding-system)
"Decode S using CODING-SYSTEM."
(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'."
(encode-coding-string s coding-system t))
(defalias 'erc-propertize 'propertize)
(defalias 'erc-view-mode-enter 'view-mode-enter)
(defalias 'erc-function-arglist 'help-function-arglist)
(defalias 'erc-delete-dups 'delete-dups)
(defalias 'erc-replace-regexp-in-string 'replace-regexp-in-string)
(defvar erc-emacs-build-time
(if (stringp emacs-build-time)
emacs-build-time
(format-time-string "%Y-%m-%d" emacs-build-time))
"Time at which Emacs was dumped out.")
(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."
(cond ((featurep 'xemacs)
(string-match match string start)
(replace-match newtext fixedcase literal string))
(t (replace-match newtext fixedcase literal string subexp))))
(defalias 'erc-cancel-timer 'cancel-timer)
(defalias 'erc-make-obsolete 'make-obsolete)
(defalias 'erc-make-obsolete-variable 'make-obsolete-variable)
(defun erc-const-expr-p (x)
(cond ((consp x)
(or (eq (car x) 'quote)
(and (memq (car x) '(function function*))
(or (symbolp (nth 1 x))
(and (eq (and (consp (nth 1 x))
(car (nth 1 x))) 'lambda) 'func)))))
((symbolp x) (and (memq x '(nil t)) t))
(t t)))
(put 'erc-assertion-failed 'error-conditions '(error))
(put 'erc-assertion-failed 'error-message "Assertion failed")
(defun erc-list* (arg &rest rest)
"Return a new list with specified args as elements, cons'd to last arg.
Thus, `(list* A B C D)' is equivalent to `(nconc (list A B C) D)', or to
`(cons A (cons B (cons C D)))'."
(cond ((not rest) arg)
((not (cdr rest)) (cons arg (car rest)))
(t (let* ((n (length rest))
(copy (copy-sequence rest))
(last (nthcdr (- n 2) copy)))
(setcdr last (car (cdr last)))
(cons arg copy)))))
(defmacro erc-assert (form &optional show-args string &rest args)
"Verify that FORM returns non-nil; signal an error if not.
Second arg SHOW-ARGS means to include arguments of FORM in message.
Other args STRING and ARGS... are arguments to be passed to `error'.
They are not evaluated unless the assertion fails. If STRING is
omitted, a default message listing FORM itself is used."
(let ((sargs
(and show-args
(delq nil (mapcar
(function
(lambda (x)
(and (not (erc-const-expr-p x)) x)))
(cdr form))))))
(list 'progn
(list 'or form
(if string
(erc-list* 'error string (append sargs args))
(list 'signal '(quote erc-assertion-failed)
(erc-list* 'list (list 'quote form) sargs))))
nil)))
(defun erc-member-if (predicate list)
"Find the first item satisfying PREDICATE in LIST.
Return the sublist of LIST whose car matches."
(let ((ptr list))
(catch 'found
(while ptr
(when (funcall predicate (car ptr))
(throw 'found ptr))
(setq ptr (cdr ptr))))))
(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."
(while (when (funcall predicate (car seq))
(setq seq (cdr seq))))
(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)
(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."
(let (newseq)
(dolist (el seq)
(when (funcall predicate el)
(setq newseq (cons el newseq))))
(nreverse newseq)))
(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."
(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)