lisp/ibuf-macs.el

   1 ;;; ibuf-macs.el --- macros for ibuffer
   2
   3 ;; Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5 ;; Author: Colin Walters <walters@verbum.org>
   6 ;; Maintainer: John Paul Wallington <jpw@gnu.org>
   7 ;; Created: 6 Dec 2001
   8 ;; Keywords: buffer, convenience
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; This program is free software; you can redistribute it and/or
  13 ;; modify it under the terms of the GNU General Public License as
  14 ;; published by the Free Software Foundation; either version 2, or (at
  15 ;; your option) any later version.
  16
  17 ;; This program is distributed in the hope that it will be useful, but
  18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 ;; General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with this program ; see the file COPYING.  If not, write to
  24 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 (eval-when-compile
  32   (require 'cl))
  33
  34 ;; From Paul Graham's "ANSI Common Lisp", adapted for Emacs Lisp here.
  35 (defmacro ibuffer-aif (test true-body &rest false-body)
  36   "Evaluate TRUE-BODY or FALSE-BODY depending on value of TEST.
  37 If TEST returns non-nil, bind `it' to the value, and evaluate
  38 TRUE-BODY.  Otherwise, evaluate forms in FALSE-BODY as if in `progn'.
  39 Compare with `if'."
  40   (let ((sym (make-symbol "ibuffer-aif-sym")))
  41     `(let ((,sym ,test))
  42        (if ,sym
  43            (let ((it ,sym))
  44              ,true-body)
  45          (progn
  46            ,@false-body)))))
  47 ;; (put 'ibuffer-aif 'lisp-indent-function 2)
  48
  49 (defmacro ibuffer-awhen (test &rest body)
  50   "Evaluate BODY if TEST returns non-nil.
  51 During evaluation of body, bind `it' to the value returned by TEST."
  52   `(ibuffer-aif ,test
  53        (progn ,@body)
  54      nil))
  55 ;; (put 'ibuffer-awhen 'lisp-indent-function 1)
  56
  57 (defmacro ibuffer-save-marks (&rest body)
  58   "Save the marked status of the buffers and execute BODY; restore marks."
  59   (let ((bufsym (make-symbol "bufsym")))
  60     `(let ((,bufsym (current-buffer))
  61            (ibuffer-save-marks-tmp-mark-list (ibuffer-current-state-list)))
  62        (unwind-protect
  63            (progn
  64              (save-excursion
  65                ,@body))
  66          (with-current-buffer ,bufsym
  67            (ibuffer-redisplay-engine
  68             ;; Get rid of dead buffers
  69             (delq nil
  70                   (mapcar #'(lambda (e) (when (buffer-live-p (car e))
  71                                           e))
  72                           ibuffer-save-marks-tmp-mark-list)))
  73            (ibuffer-redisplay t))))))
  74 ;; (put 'ibuffer-save-marks 'lisp-indent-function 0)
  75
  76 ;;;###autoload
  77 (defmacro* define-ibuffer-column (symbol (&key name inline props
  78                                                summarizer) &rest body)
  79   "Define a column SYMBOL for use with `ibuffer-formats'.
  80
  81 BODY will be called with `buffer' bound to the buffer object, and
  82 `mark' bound to the current mark on the buffer.  The original ibuffer
  83 buffer will be bound to `ibuffer-buf'.
  84
  85 If NAME is given, it will be used as a title for the column.
  86 Otherwise, the title will default to a capitalized version of the
  87 SYMBOL's name.  PROPS is a plist of additional properties to add to
  88 the text, such as `mouse-face'.  And SUMMARIZER, if given, is a
  89 function which will be passed a list of all the strings in its column;
  90 it should return a string to display at the bottom.
  91
  92 Note that this macro expands into a `defun' for a function named
  93 ibuffer-make-column-NAME.  If INLINE is non-nil, then the form will be
  94 inlined into the compiled format versions.  This means that if you
  95 change its definition, you should explicitly call
  96 `ibuffer-recompile-formats'."
  97   (let* ((sym (intern (concat "ibuffer-make-column-"
  98                               (symbol-name symbol))))
  99          (bod-1 `(with-current-buffer buffer
 100                    ,@body))
 101          (bod (if props
 102                  `(propertize
 103                    ,bod-1
 104                    ,@props)
 105                 bod-1)))
 106     `(progn
 107        ,(if inline
 108             `(push '(,sym ,bod) ibuffer-inline-columns)
 109           `(defun ,sym (buffer mark)
 110              ,bod))
 111        (put (quote ,sym) 'ibuffer-column-name
 112             ,(if (stringp name)
 113                  name
 114                (capitalize (symbol-name symbol))))
 115        ,(if summarizer
 116             ;; Store the name of the summarizing function.
 117             `(put (quote ,sym) 'ibuffer-column-summarizer
 118                   (quote ,summarizer)))
 119        ,(if summarizer
 120             ;; This will store the actual values of the column
 121             ;; summary.
 122             `(put (quote ,sym) 'ibuffer-column-summary nil))
 123        :autoload-end)))
 124 ;; (put 'define-ibuffer-column 'lisp-indent-function 'defun)
 125
 126 ;;;###autoload
 127 (defmacro* define-ibuffer-sorter (name documentation
 128                                        (&key
 129                                         description)
 130                                        &rest body)
 131   "Define a method of sorting named NAME.
 132 DOCUMENTATION is the documentation of the function, which will be called
 133 `ibuffer-do-sort-by-NAME'.
 134 DESCRIPTION is a short string describing the sorting method.
 135
 136 For sorting, the forms in BODY will be evaluated with `a' bound to one
 137 buffer object, and `b' bound to another.  BODY should return a non-nil
 138 value if and only if `a' is \"less than\" `b'."
 139   `(progn
 140      (defun ,(intern (concat "ibuffer-do-sort-by-" (symbol-name name))) ()
 141        ,(or documentation "No :documentation specified for this sorting method.")
 142        (interactive)
 143        (setq ibuffer-sorting-mode ',name)
 144        (ibuffer-redisplay t))
 145      (push (list ',name ,description
 146                  #'(lambda (a b)
 147                      ,@body))
 148            ibuffer-sorting-functions-alist)
 149      :autoload-end))
 150 ;; (put 'define-ibuffer-sorter 'lisp-indent-function 1)
 151
 152 ;;;###autoload
 153 (defmacro* define-ibuffer-op (op args
 154                                  documentation
 155                                  (&key
 156                                   interactive
 157                                   mark
 158                                   modifier-p
 159                                   dangerous
 160                                   (opstring "operated on")
 161                                   (active-opstring "Operate on")
 162                                   complex)
 163                                  &rest body)
 164   "Generate a function which operates on a buffer.
 165 OP becomes the name of the function; if it doesn't begin with
 166 `ibuffer-do-', then that is prepended to it.
 167 When an operation is performed, this function will be called once for
 168 each marked buffer, with that buffer current.
 169
 170 ARGS becomes the formal parameters of the function.
 171 DOCUMENTATION becomes the docstring of the function.
 172 INTERACTIVE becomes the interactive specification of the function.
 173 MARK describes which type of mark (:deletion, or nil) this operation
 174 uses.  :deletion means the function operates on buffers marked for
 175 deletion, otherwise it acts on normally marked buffers.
 176 MODIFIER-P describes how the function modifies buffers.  This is used
 177 to set the modification flag of the Ibuffer buffer itself.  Valid
 178 values are:
 179  nil - the function never modifiers buffers
 180  t - the function it always modifies buffers
 181  :maybe - attempt to discover this information by comparing the
 182   buffer's modification flag.
 183 DANGEROUS is a boolean which should be set if the user should be
 184 prompted before performing this operation.
 185 OPSTRING is a string which will be displayed to the user after the
 186 operation is complete, in the form:
 187  \"Operation complete; OPSTRING x buffers\"
 188 ACTIVE-OPSTRING is a string which will be displayed to the user in a
 189 confirmation message, in the form:
 190  \"Really ACTIVE-OPSTRING x buffers?\"
 191 COMPLEX means this function is special; see the source code of this
 192 macro for exactly what it does."
 193   `(progn
 194     (defun ,(intern (concat (if (string-match "^ibuffer-do" (symbol-name op))
 195                                 "" "ibuffer-do-") (symbol-name op)))
 196       ,args
 197      ,(if (stringp documentation)
 198           documentation
 199         (format "%s marked buffers." active-opstring))
 200      ,(if (not (null interactive))
 201           `(interactive ,interactive)
 202         '(interactive))
 203      (assert (eq major-mode 'ibuffer-mode))
 204      (setq ibuffer-did-modification nil)
 205      (let ((marked-names  (,(case mark
 206                               (:deletion
 207                                'ibuffer-deletion-marked-buffer-names)
 208                               (t
 209                                'ibuffer-marked-buffer-names)))))
 210        (when (null marked-names)
 211          (setq marked-names (list (buffer-name (ibuffer-current-buffer))))
 212          (ibuffer-set-mark ,(case mark
 213                               (:deletion
 214                                'ibuffer-deletion-char)
 215                               (t
 216                                'ibuffer-marked-char))))
 217        ,(let* ((finish (append
 218                         '(progn)
 219                         (if (eq modifier-p t)
 220                             '((setq ibuffer-did-modification t))
 221                           ())
 222                         `((ibuffer-redisplay t)
 223                           (message ,(concat "Operation finished; " opstring " %s buffers") count))))
 224                (inner-body (if complex
 225                                `(progn ,@body)
 226                              `(progn
 227                                 (with-current-buffer buf
 228                                   (save-excursion
 229                                     ,@body))
 230                                 t)))
 231                (body `(let ((count
 232                              (,(case mark
 233                                  (:deletion
 234                                   'ibuffer-map-deletion-lines)
 235                                  (t
 236                                   'ibuffer-map-marked-lines))
 237                               #'(lambda (buf mark)
 238                                   ,(if (eq modifier-p :maybe)
 239                                        `(let ((ibuffer-tmp-previous-buffer-modification
 240                                                (buffer-modified-p buf)))
 241                                           (prog1 ,inner-body
 242                                             (when (not (eq ibuffer-tmp-previous-buffer-modification
 243                                                            (buffer-modified-p buf)))
 244                                               (setq ibuffer-did-modification t))))
 245                                      inner-body)))))
 246                         ,finish)))
 247           (if dangerous
 248               `(when (ibuffer-confirm-operation-on ,active-opstring marked-names)
 249                  ,body)
 250             body))))
 251     :autoload-end))
 252 ;; (put 'define-ibuffer-op 'lisp-indent-function 2)
 253
 254 ;;;###autoload
 255 (defmacro* define-ibuffer-filter (name documentation
 256                                        (&key
 257                                         reader
 258                                         description)
 259                                        &rest body)
 260   "Define a filter named NAME.
 261 DOCUMENTATION is the documentation of the function.
 262 READER is a form which should read a qualifier from the user.
 263 DESCRIPTION is a short string describing the filter.
 264
 265 BODY should contain forms which will be evaluated to test whether or
 266 not a particular buffer should be displayed or not.  The forms in BODY
 267 will be evaluated with BUF bound to the buffer object, and QUALIFIER
 268 bound to the current value of the filter."
 269   (let ((fn-name (intern (concat "ibuffer-filter-by-" (symbol-name name)))))
 270     `(progn
 271        (defun ,fn-name (qualifier)
 272          ,(concat (or documentation "This filter is not documented."))
 273          (interactive (list ,reader))
 274          (ibuffer-push-filter (cons ',name qualifier))
 275          (message
 276           (format ,(concat (format "Filter by %s added: " description)
 277                            " %s")
 278                   qualifier))
 279          (ibuffer-update nil t))
 280        (push (list ',name ,description
 281                    #'(lambda (buf qualifier)
 282                        ,@body))
 283              ibuffer-filtering-alist)
 284        :autoload-end)))
 285 ;; (put 'define-ibuffer-filter 'lisp-indent-function 2)
 286
 287 (provide 'ibuf-macs)
 288
 289 ;;; ibuf-macs.el ends here