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+;;; pcvs-util.el --- Utitlity functions for pcl-cvs
+
+;; Copyright (C) 1998-2000  Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@cs.yale.edu>
+;; Keywords: pcl-cvs
+;; Version: $Name:  $
+;; Revision: $Id: pcl-cvs-util.el,v 1.26 2000/03/05 21:32:21 monnier Exp $
+
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+;;;;
+;;;; list processing
+;;;l
+
+(defsubst cvs-car (x) (if (consp x) (car x) x))
+(defalias 'cvs-cdr 'cdr-safe)
+(defsubst cvs-append (&rest xs)
+  (apply 'append (mapcar (lambda (x) (if (listp x) x (list x))) xs)))
+
+(defsubst cvs-every (-cvs-every-f -cvs-every-l)
+  (while (consp -cvs-every-l)
+    (unless (funcall -cvs-every-f (pop -cvs-every-l))
+      (setq -cvs-every-l t)))
+  (not -cvs-every-l))
+
+(defun cvs-union (xs ys)
+  (let ((zs ys))
+    (dolist (x xs zs)
+      (unless (member x ys) (push x zs)))))
+      
+
+(defun cvs-map (-cvs-map-f &rest -cvs-map-ls)
+  (unless (cvs-every 'null -cvs-map-ls)
+    (cons (apply -cvs-map-f (mapcar 'car -cvs-map-ls))
+	  (apply 'cvs-map -cvs-map-f (mapcar 'cdr -cvs-map-ls)))))
+
+(defun cvs-first (l &optional n)
+  (if (null n) (car l)
+    (when l
+      (let* ((nl (list (pop l)))
+	     (ret nl))
+	(while (and l (> n 1))
+	  (setcdr nl (list (pop l)))
+	  (setq nl (cdr nl))
+	  (decf n))
+	ret))))
+
+(defun cvs-partition (p l)
+  "Partition a list L into two lists based on predicate P.
+The function returns a `cons' cell where the `car' contains
+elements of L for which P is true while the `cdr' contains
+the other elements.  The ordering among elements is maintained."
+  (let (car cdr)
+    (dolist (x l)
+      (if (funcall p x) (push x car) (push x cdr)))
+    (cons (nreverse car) (nreverse cdr))))
+
+;;;; 
+;;;; frame, window, buffer handling
+;;;; 
+
+(defun cvs-pop-to-buffer-same-frame (buf)
+  "Pop to BUF like `pop-to-buffer' but staying on the same frame.
+If `pop-to-buffer' would have opened a new frame, this function would
+try to split the a new window instead."
+  (let ((pop-up-windows (or pop-up-windows pop-up-frames))
+	(pop-up-frames nil))
+    (or (let ((buf (get-buffer-window buf))) (and buf (select-window buf)))
+	(and pop-up-windows
+	     (ignore-errors (select-window (split-window-vertically)))
+	     (switch-to-buffer buf))
+	(pop-to-buffer (current-buffer)))))
+
+(defun cvs-bury-buffer (buf &optional mainbuf)
+  "Hide the buffer BUF that was temporarily popped up.
+BUF is assumed to be a temporary buffer used from the buffer MAINBUF."
+  (interactive (list (current-buffer)))
+  (save-current-buffer
+    (let ((win (if (eq buf (window-buffer (selected-window))) (selected-window)
+		 (get-buffer-window buf t))))
+      (when win
+	(if (window-dedicated-p win)
+	    (condition-case ()
+		(delete-window win)
+	      (error (iconify-frame (window-frame win))))
+	  (if (and mainbuf (get-buffer-window mainbuf))
+	      (delete-window win)))))
+    (with-current-buffer buf
+      (bury-buffer (unless (and (eq buf (window-buffer (selected-window)))
+				(not (window-dedicated-p (selected-window))))
+		     buf)))
+    (when mainbuf
+      (let ((mainwin (or (get-buffer-window mainbuf)
+			 (get-buffer-window mainbuf 'visible))))
+	(when mainwin (select-window mainwin))))))
+	      
+(defun cvs-get-buffer-create (name &optional noreuse)
+  "Create a buffer NAME unless such a buffer already exists.
+If the NAME looks like an absolute file name, the buffer will be created
+with `create-file-buffer' and will probably get another name than NAME.
+In such a case, the search for another buffer with the same name doesn't
+use the buffer name but the buffer's `list-buffers-directory' variable.
+If NOREUSE is non-nil, always return a new buffer."
+  (or (and (not (file-name-absolute-p name)) (get-buffer-create name))
+      (unless noreuse
+	(dolist (buf (buffer-list))
+	  (with-current-buffer buf
+	    (when (equal name list-buffers-directory)
+	      (return buf)))))
+      (with-current-buffer (create-file-buffer name)
+	(set (make-local-variable 'list-buffers-directory) name)
+	(current-buffer))))
+
+;;;;
+;;;; string processing
+;;;;
+
+(defun cvs-file-to-string (file &optional oneline args)
+  "Read the content of FILE and return it as a string.
+If ONELINE is t, only the first line (no \\n) will be returned.
+If ARGS is non-nil, the file will be executed with ARGS as its
+arguments.  If ARGS is not a list, no argument will be passed."
+  (with-temp-buffer
+    (condition-case nil
+	(progn
+	  (if args
+	      (apply 'call-process
+		     file nil t nil (when (listp args) args))
+	    (insert-file-contents file))
+	  (buffer-substring (point-min)
+			    (if oneline
+				(progn (goto-char (point-min)) (end-of-line) (point))
+			      (point-max))))
+      (file-error nil))))
+
+(defun cvs-string-prefix-p (str1 str2)
+  "Tell whether STR1 is a prefix of STR2."
+  (let ((length1 (length str1)))
+    (and (>= (length str2) length1)
+	 (string= str1 (substring str2 0 length1)))))
+
+;; (string->strings (strings->string X)) == X
+(defun cvs-strings->string (strings &optional separator)
+  "Concatenate the STRINGS, adding the SEPARATOR (default \" \").
+This tries to quote the strings to avoid ambiguity such that
+  (cvs-string->strings (cvs-strings->string strs)) == strs
+Only some SEPARATOR will work properly."
+  (let ((sep (or separator " ")))
+    (mapconcat
+     (lambda (str)
+       (if (string-match "[\\\"]" str)
+	   (concat "\"" (replace-regexps-in-string "[\\\"]" "\\\\\\&" str) "\"")
+	 str))
+     strings sep)))
+
+;; (string->strings (strings->string X)) == X
+(defun cvs-string->strings (string &optional separator)
+  "Split the STRING into a list of strings.
+It understands elisp style quoting within STRING such that
+  (cvs-string->strings (cvs-strings->string strs)) == strs
+The SEPARATOR regexp defaults to \"\\s-+\"."
+  (let ((sep (or separator "\\s-+"))
+	(i (string-match "[\"]" string)))
+    (if (null i) (split-string string sep)	; no quoting:  easy
+      (append (unless (eq i 0) (split-string (substring string 0 i) sep))
+	      (let ((rfs (read-from-string string i)))
+		(cons (car rfs)
+		      (cvs-string->strings (substring string (cdr rfs)) sep)))))))
+      
+
+(defun cvs-string-fill (str n &optional filling truncate)
+  "Add FILLING (defaults to the space char) to STR to reach size N.
+If STR is longer than N, truncate if TRUNCATE is set, else don't do anything."
+  (let ((l (length str)))
+    (if (> l n)
+	(if truncate (substring str 0 n) str)
+      (concat str (make-string (- n l) (or filling ? ))))))
+
+;;;; 
+;;;; file names
+;;;; 
+
+(defsubst cvs-expand-dir-name (d)
+  (file-name-as-directory (expand-file-name d)))
+
+;;;;
+;;;; (interactive <foo>) support function
+;;;;
+
+(defstruct (cvs-qtypedesc
+	    (:constructor nil) (:copier nil)
+	    (:constructor cvs-qtypedesc-create
+			  (str2obj obj2str &optional complete hist-sym require)))
+  str2obj
+  obj2str
+  hist-sym
+  complete
+  require)
+
+
+(defconst cvs-qtypedesc-string1 (cvs-qtypedesc-create 'identity 'identity t))
+(defconst cvs-qtypedesc-string (cvs-qtypedesc-create 'identity 'identity))
+(defconst cvs-qtypedesc-strings
+  (cvs-qtypedesc-create 'cvs-string->strings 'cvs-strings->string nil))
+
+(defun cvs-query-read (default prompt qtypedesc &optional hist-sym)
+  (let* ((qtypedesc (or qtypedesc cvs-qtypedesc-strings))
+	 (hist-sym (or hist-sym (cvs-qtypedesc-hist-sym qtypedesc)))
+	 (complete (cvs-qtypedesc-complete qtypedesc))
+	 (completions (and (functionp complete) (funcall complete)))
+	 (initval (funcall (cvs-qtypedesc-obj2str qtypedesc) default)))
+    (funcall (cvs-qtypedesc-str2obj qtypedesc)
+	     (cond
+	      ((null complete) (read-string prompt initval hist-sym))
+	      ((functionp complete)
+	       (completing-read prompt completions
+				nil (cvs-qtypedesc-require qtypedesc)
+				initval hist-sym))
+	      (t initval)))))
+
+;;;; 
+;;;; Flags handling
+;;;; 
+
+(defstruct (cvs-flags
+	    (:constructor nil)
+	    (:constructor -cvs-flags-make
+			  (desc defaults &optional qtypedesc hist-sym)))
+  defaults persist desc qtypedesc hist-sym)
+
+(defmacro cvs-flags-define (sym defaults
+				&optional desc qtypedesc hist-sym docstring)
+  `(defconst ,sym
+     (let ((bound (boundp ',sym)))
+       (if (and bound (cvs-flags-p ,sym)) ,sym
+	 (let ((defaults ,defaults))
+	   (-cvs-flags-make ,desc
+			    (if bound (cons ,sym (cdr defaults)) defaults)
+			    ,qtypedesc ,hist-sym))))
+     ,docstring))
+
+(defun cvs-flags-query (sym &optional desc arg)
+  "Query flags based on SYM.
+Optional argument DESC will be used for the prompt
+If ARG (or a prefix argument) is nil, just use the 0th default.
+If it is a non-negative integer, use the corresponding default.
+If it is a negative integer query for a new value of the corresponding
+  default and return that new value.
+If it is \\[universal-argument], just query and return a value without
+  altering the defaults.
+If it is \\[universal-argument] \\[universal-argument], behave just
+  as if a negative zero was provided."
+  (let* ((flags (symbol-value sym))
+	 (desc (or desc (cvs-flags-desc flags)))
+	 (qtypedesc (cvs-flags-qtypedesc flags))
+	 (hist-sym (cvs-flags-hist-sym flags))
+	 (arg (if (eq arg 'noquery) 0 (or arg current-prefix-arg 0)))
+	 (numarg (prefix-numeric-value arg))
+	 (defaults (cvs-flags-defaults flags))
+	 (permstr (if (< numarg 0) (format " (%sth default)" (- numarg)))))
+    ;; special case for universal-argument
+    (when (consp arg)
+      (setq permstr (if (> numarg 4) " (permanent)" ""))
+      (setq numarg 0))
+
+    ;; sanity check
+    (unless (< (abs numarg) (length defaults))
+      (error "There is no %sth default." (abs numarg)))
+
+    (if permstr
+	(let* ((prompt (format "%s%s: " desc permstr))
+	       (fs (cvs-query-read (nth (- numarg) (cvs-flags-defaults flags))
+				   prompt qtypedesc hist-sym)))
+	  (when (not (equal permstr ""))
+	    (setf (nth (- numarg) (cvs-flags-defaults flags)) fs))
+	  fs)
+      (nth numarg defaults))))
+
+(defsubst cvs-flags-set (sym index value)
+  "Set SYM's INDEX'th setting to VALUE."
+  (setf (nth index (cvs-flags-defaults (symbol-value sym))) value))
+
+;;;; 
+;;;; Prefix keys
+;;;; 
+
+(defconst cvs-prefix-number 10)
+
+(defsubst cvs-prefix-sym (sym) (intern (concat (symbol-name sym) "-cps")))
+
+(defmacro cvs-prefix-define (sym docstring desc defaults
+				 &optional qtypedesc hist-sym)
+  (let ((cps (cvs-prefix-sym sym)))
+    `(progn
+       (defvar ,sym nil ,(cons (or docstring "") "
+See `cvs-prefix-set' for further description of the behavior."))
+       (defconst ,cps
+	 (let ((defaults ,defaults))
+	   ;; sanity ensurance
+	   (unless (>= (length defaults) cvs-prefix-number)
+	     (setq defaults (append defaults
+				    (make-list (1- cvs-prefix-number)
+					       (first defaults)))))
+	   (-cvs-flags-make ,desc defaults ,qtypedesc ,hist-sym))))))
+
+(defun cvs-prefix-make-local (sym)
+  (let ((cps (cvs-prefix-sym sym)))
+    (make-local-variable sym)
+    (set (make-local-variable cps) (copy-cvs-flags (symbol-value cps)))))
+
+(defun cvs-prefix-set (sym arg)
+  ;; we could distinguish between numeric and non-numeric prefix args instead of
+  ;; relying on that magic `4'.
+  "Set the cvs-prefix contained in SYM.
+If ARG is between 0 and 9, it selects the corresponding default.
+If ARG is negative (or \\[universal-argument] which corresponds to negative 0),
+  it queries the user and sets the -ARG'th default.
+If ARG is greater than 9 (or \\[universal-argument] \\[universal-argument]),
+  the (ARG mod 10)'th prefix is made persistent.
+If ARG is NIL toggle the PREFIX's value between its 0th default and NIL
+  and reset the persistence."
+  (let* ((prefix (symbol-value (cvs-prefix-sym sym)))
+	 (numarg (if (integerp arg) arg 0))
+	 (defs (cvs-flags-defaults prefix)))
+
+    ;; set persistence if requested
+    (when (> (prefix-numeric-value arg) 9)
+      (setf (cvs-flags-persist prefix) t)
+      (setq numarg (mod numarg 10)))
+
+    ;; set the value
+    (set sym
+	 (cond
+	  ((null arg)
+	   (setf (cvs-flags-persist prefix) nil)
+	   (unless (symbol-value sym) (first (cvs-flags-defaults prefix))))
+
+	  ((or (consp arg) (< numarg 0))
+	   (setf (nth (- numarg) (cvs-flags-defaults prefix))
+		 (cvs-query-read (nth (- numarg) (cvs-flags-defaults prefix))
+				 (format "%s: " (cvs-flags-desc prefix))
+				 (cvs-flags-qtypedesc prefix)
+				 (cvs-flags-hist-sym prefix))))
+	  (t (nth numarg (cvs-flags-defaults prefix)))))
+    (force-mode-line-update)))
+
+(defun cvs-prefix-get (sym &optional read-only)
+  "Return the current value of the prefix SYM.
+and reset it unless READ-ONLY is non-nil."
+  (prog1 (symbol-value sym)
+    (unless (or read-only
+		(cvs-flags-persist (symbol-value (cvs-prefix-sym sym))))
+      (set sym nil)
+      (force-mode-line-update))))
+
+(provide 'pcvs-util)
+
+;;; pcl-cvs-util.el ends here