Mercurial > hg > xemacs-beta
view lisp/view-less.el @ 665:fdefd0186b75
[xemacs-hg @ 2001-09-20 06:28:42 by ben]
The great integral types renaming.
The purpose of this is to rationalize the names used for various
integral types, so that they match their intended uses and follow
consist conventions, and eliminate types that were not semantically
different from each other.
The conventions are:
-- All integral types that measure quantities of anything are
signed. Some people disagree vociferously with this, but their
arguments are mostly theoretical, and are vastly outweighed by
the practical headaches of mixing signed and unsigned values,
and more importantly by the far increased likelihood of
inadvertent bugs: Because of the broken "viral" nature of
unsigned quantities in C (operations involving mixed
signed/unsigned are done unsigned, when exactly the opposite is
nearly always wanted), even a single error in declaring a
quantity unsigned that should be signed, or even the even more
subtle error of comparing signed and unsigned values and
forgetting the necessary cast, can be catastrophic, as
comparisons will yield wrong results. -Wsign-compare is turned
on specifically to catch this, but this tends to result in a
great number of warnings when mixing signed and unsigned, and
the casts are annoying. More has been written on this
elsewhere.
-- All such quantity types just mentioned boil down to EMACS_INT,
which is 32 bits on 32-bit machines and 64 bits on 64-bit
machines. This is guaranteed to be the same size as Lisp
objects of type `int', and (as far as I can tell) of size_t
(unsigned!) and ssize_t. The only type below that is not an
EMACS_INT is Hashcode, which is an unsigned value of the same
size as EMACS_INT.
-- Type names should be relatively short (no more than 10
characters or so), with the first letter capitalized and no
underscores if they can at all be avoided.
-- "count" == a zero-based measurement of some quantity. Includes
sizes, offsets, and indexes.
-- "bpos" == a one-based measurement of a position in a buffer.
"Charbpos" and "Bytebpos" count text in the buffer, rather than
bytes in memory; thus Bytebpos does not directly correspond to
the memory representation. Use "Membpos" for this.
-- "Char" refers to internal-format characters, not to the C type
"char", which is really a byte.
-- For the actual name changes, see the script below.
I ran the following script to do the conversion. (NOTE: This script
is idempotent. You can safely run it multiple times and it will
not screw up previous results -- in fact, it will do nothing if
nothing has changed. Thus, it can be run repeatedly as necessary
to handle patches coming in from old workspaces, or old branches.)
There are two tags, just before and just after the change:
`pre-integral-type-rename' and `post-integral-type-rename'. When
merging code from the main trunk into a branch, the best thing to
do is first merge up to `pre-integral-type-rename', then apply the
script and associated changes, then merge from
`post-integral-type-change' to the present. (Alternatively, just do
the merging in one operation; but you may then have a lot of
conflicts needing to be resolved by hand.)
Script `fixtypes.sh' follows:
----------------------------------- cut ------------------------------------
files="*.[ch] s/*.h m/*.h config.h.in ../configure.in Makefile.in.in ../lib-src/*.[ch] ../lwlib/*.[ch]"
gr Memory_Count Bytecount $files
gr Lstream_Data_Count Bytecount $files
gr Element_Count Elemcount $files
gr Hash_Code Hashcode $files
gr extcount bytecount $files
gr bufpos charbpos $files
gr bytind bytebpos $files
gr memind membpos $files
gr bufbyte intbyte $files
gr Extcount Bytecount $files
gr Bufpos Charbpos $files
gr Bytind Bytebpos $files
gr Memind Membpos $files
gr Bufbyte Intbyte $files
gr EXTCOUNT BYTECOUNT $files
gr BUFPOS CHARBPOS $files
gr BYTIND BYTEBPOS $files
gr MEMIND MEMBPOS $files
gr BUFBYTE INTBYTE $files
gr MEMORY_COUNT BYTECOUNT $files
gr LSTREAM_DATA_COUNT BYTECOUNT $files
gr ELEMENT_COUNT ELEMCOUNT $files
gr HASH_CODE HASHCODE $files
----------------------------------- cut ------------------------------------
`fixtypes.sh' is a Bourne-shell script; it uses 'gr':
----------------------------------- cut ------------------------------------
#!/bin/sh
# Usage is like this:
# gr FROM TO FILES ...
# globally replace FROM with TO in FILES. FROM and TO are regular expressions.
# backup files are stored in the `backup' directory.
from="$1"
to="$2"
shift 2
echo ${1+"$@"} | xargs global-replace "s/$from/$to/g"
----------------------------------- cut ------------------------------------
`gr' in turn uses a Perl script to do its real work,
`global-replace', which follows:
----------------------------------- cut ------------------------------------
: #-*- Perl -*-
### global-modify --- modify the contents of a file by a Perl expression
## Copyright (C) 1999 Martin Buchholz.
## Copyright (C) 2001 Ben Wing.
## Authors: Martin Buchholz <martin@xemacs.org>, Ben Wing <ben@xemacs.org>
## Maintainer: Ben Wing <ben@xemacs.org>
## Current Version: 1.0, May 5, 2001
# This program 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.
#
# This program 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 XEmacs; see the file COPYING. If not, write to the Free
# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
eval 'exec perl -w -S $0 ${1+"$@"}'
if 0;
use strict;
use FileHandle;
use Carp;
use Getopt::Long;
use File::Basename;
(my $myName = $0) =~ s@.*/@@; my $usage="
Usage: $myName [--help] [--backup-dir=DIR] [--line-mode] [--hunk-mode]
PERLEXPR FILE ...
Globally modify a file, either line by line or in one big hunk.
Typical usage is like this:
[with GNU print, GNU xargs: guaranteed to handle spaces, quotes, etc.
in file names]
find . -name '*.[ch]' -print0 | xargs -0 $0 's/\bCONST\b/const/g'\n
[with non-GNU print, xargs]
find . -name '*.[ch]' -print | xargs $0 's/\bCONST\b/const/g'\n
The file is read in, either line by line (with --line-mode specified)
or in one big hunk (with --hunk-mode specified; it's the default), and
the Perl expression is then evalled with \$_ set to the line or hunk of
text, including the terminating newline if there is one. It should
destructively modify the value there, storing the changed result in \$_.
Files in which any modifications are made are backed up to the directory
specified using --backup-dir, or to `backup' by default. To disable this,
use --backup-dir= with no argument.
Hunk mode is the default because it is MUCH MUCH faster than line-by-line.
Use line-by-line only when it matters, e.g. you want to do a replacement
only once per line (the default without the `g' argument). Conversely,
when using hunk mode, *ALWAYS* use `g'; otherwise, you will only make one
replacement in the entire file!
";
my %options = ();
$Getopt::Long::ignorecase = 0;
&GetOptions (
\%options,
'help', 'backup-dir=s', 'line-mode', 'hunk-mode',
);
die $usage if $options{"help"} or @ARGV <= 1;
my $code = shift;
die $usage if grep (-d || ! -w, @ARGV);
sub SafeOpen {
open ((my $fh = new FileHandle), $_[0]);
confess "Can't open $_[0]: $!" if ! defined $fh;
return $fh;
}
sub SafeClose {
close $_[0] or confess "Can't close $_[0]: $!";
}
sub FileContents {
my $fh = SafeOpen ("< $_[0]");
my $olddollarslash = $/;
local $/ = undef;
my $contents = <$fh>;
$/ = $olddollarslash;
return $contents;
}
sub WriteStringToFile {
my $fh = SafeOpen ("> $_[0]");
binmode $fh;
print $fh $_[1] or confess "$_[0]: $!\n";
SafeClose $fh;
}
foreach my $file (@ARGV) {
my $changed_p = 0;
my $new_contents = "";
if ($options{"line-mode"}) {
my $fh = SafeOpen $file;
while (<$fh>) {
my $save_line = $_;
eval $code;
$changed_p = 1 if $save_line ne $_;
$new_contents .= $_;
}
} else {
my $orig_contents = $_ = FileContents $file;
eval $code;
if ($_ ne $orig_contents) {
$changed_p = 1;
$new_contents = $_;
}
}
if ($changed_p) {
my $backdir = $options{"backup-dir"};
$backdir = "backup" if !defined ($backdir);
if ($backdir) {
my ($name, $path, $suffix) = fileparse ($file, "");
my $backfulldir = $path . $backdir;
my $backfile = "$backfulldir/$name";
mkdir $backfulldir, 0755 unless -d $backfulldir;
print "modifying $file (original saved in $backfile)\n";
rename $file, $backfile;
}
WriteStringToFile ($file, $new_contents);
}
}
----------------------------------- cut ------------------------------------
In addition to those programs, I needed to fix up a few other
things, particularly relating to the duplicate definitions of
types, now that some types merged with others. Specifically:
1. in lisp.h, removed duplicate declarations of Bytecount. The
changed code should now look like this: (In each code snippet
below, the first and last lines are the same as the original, as
are all lines outside of those lines. That allows you to locate
the section to be replaced, and replace the stuff in that
section, verifying that there isn't anything new added that
would need to be kept.)
--------------------------------- snip -------------------------------------
/* Counts of bytes or chars */
typedef EMACS_INT Bytecount;
typedef EMACS_INT Charcount;
/* Counts of elements */
typedef EMACS_INT Elemcount;
/* Hash codes */
typedef unsigned long Hashcode;
/* ------------------------ dynamic arrays ------------------- */
--------------------------------- snip -------------------------------------
2. in lstream.h, removed duplicate declaration of Bytecount.
Rewrote the comment about this type. The changed code should
now look like this:
--------------------------------- snip -------------------------------------
#endif
/* The have been some arguments over the what the type should be that
specifies a count of bytes in a data block to be written out or read in,
using Lstream_read(), Lstream_write(), and related functions.
Originally it was long, which worked fine; Martin "corrected" these to
size_t and ssize_t on the grounds that this is theoretically cleaner and
is in keeping with the C standards. Unfortunately, this practice is
horribly error-prone due to design flaws in the way that mixed
signed/unsigned arithmetic happens. In fact, by doing this change,
Martin introduced a subtle but fatal error that caused the operation of
sending large mail messages to the SMTP server under Windows to fail.
By putting all values back to be signed, avoiding any signed/unsigned
mixing, the bug immediately went away. The type then in use was
Lstream_Data_Count, so that it be reverted cleanly if a vote came to
that. Now it is Bytecount.
Some earlier comments about why the type must be signed: This MUST BE
SIGNED, since it also is used in functions that return the number of
bytes actually read to or written from in an operation, and these
functions can return -1 to signal error.
Note that the standard Unix read() and write() functions define the
count going in as a size_t, which is UNSIGNED, and the count going
out as an ssize_t, which is SIGNED. This is a horrible design
flaw. Not only is it highly likely to lead to logic errors when a
-1 gets interpreted as a large positive number, but operations are
bound to fail in all sorts of horrible ways when a number in the
upper-half of the size_t range is passed in -- this number is
unrepresentable as an ssize_t, so code that checks to see how many
bytes are actually written (which is mandatory if you are dealing
with certain types of devices) will get completely screwed up.
--ben
*/
typedef enum lstream_buffering
--------------------------------- snip -------------------------------------
3. in dumper.c, there are four places, all inside of switch()
statements, where XD_BYTECOUNT appears twice as a case tag. In
each case, the two case blocks contain identical code, and you
should *REMOVE THE SECOND* and leave the first.
| author | ben |
|---|---|
| date | Thu, 20 Sep 2001 06:31:11 +0000 |
| parents | 1ccc32a20af4 |
| children | 74f176715ed2 |
line wrap: on
line source
;;; view-less.el --- Minor mode for browsing files with keybindings like `less' ;; Copyright (C) 1994, 1995 Tinker Systems and INS Engineering Corp. ;; Author: Jonathan Stigelman <stig@hackvan.com> ;; Maintainer: XEmacs Development Team ;; Keywords: wp, unix ;; This file is part of XEmacs. ;; ;; XEmacs 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 of the License, or ;; (at your option) any later version. ;; ;; XEmacs 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 XEmacs; if not, write to the Free Software ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. ;;; Synched up with: Not in FSF. ;;; Commentary: ;; This mode is for browsing files without changing them. Keybindings ;; similar to those used by the less(1) program are used. ;; ;; Originally written for v18 by David Gudeman (gudeman@arizona.edu) ;; Mods by Bengt Martensson, to closely resemble less (July 1987) ;; ;; If you would like all write-protected files to be visited in view-mode, ;; then add the following to your .emacs file: ;; ;; (add-hook 'find-file-hooks 'auto-view-mode) ;;; Code: (defvar view-search-string "" "Last string searched for with view-search functions.") (defvar view-search-arg 1 "Argument to last view search.") (defvar view-default-lines 10 "Default value for the \"d\" and \"u\" commands in view-mode") (defvar view-minor-mode nil "Non-nil when view-mode is active. Call `view-mode' to toggle.") (make-variable-buffer-local 'view-minor-mode) ;;;###autoload (defvar view-minor-mode-map (let ((map (make-keymap))) (set-keymap-name map 'view-minor-mode-map) (suppress-keymap map) (define-key map "-" 'negative-argument) (define-key map " " 'scroll-up) (define-key map "f" 'scroll-up) (define-key map "b" 'scroll-down) (define-key map 'backspace 'scroll-down) (define-key map 'delete 'scroll-down) (define-key map "\r" 'view-scroll-lines-up) (define-key map "\n" 'view-scroll-lines-up) (define-key map "e" 'view-scroll-lines-up) (define-key map "j" 'view-scroll-lines-up) (define-key map "y" 'view-scroll-lines-down) (define-key map "k" 'view-scroll-lines-down) (define-key map "d" 'view-scroll-some-lines-up) (define-key map "u" 'view-scroll-some-lines-down) (define-key map "r" 'recenter) (define-key map "t" 'toggle-truncate-lines) (define-key map "N" 'view-buffer) (define-key map "E" 'view-file) (define-key map "P" 'view-buffer) (define-key map "!" 'shell-command) (define-key map "|" 'shell-command-on-region) (define-key map "=" 'what-line) (define-key map "?" 'view-search-backward) (define-key map "h" 'view-mode-describe) (define-key map "s" 'view-repeat-search) (define-key map "n" 'view-repeat-search) (define-key map "/" 'view-search-forward) (define-key map "\\" 'view-search-backward) (define-key map "g" 'view-goto-line) (define-key map "G" 'view-last-windowful) (define-key map "%" 'view-goto-percent) (define-key map "p" 'view-goto-percent) (define-key map "m" 'point-to-register) (define-key map "'" 'register-to-point) (define-key map "C" 'view-cleanup-backspaces) (define-key map "\C-c\C-c" 'view-quit) ;; #### - should this use substitute-command-keys? (define-key map "\C-x\C-q" 'view-quit-toggle-ro) (define-key map "q" 'view-quit) map )) (add-minor-mode 'view-minor-mode " View" view-minor-mode-map) ;;;###autoload (defvar view-mode-map (let ((map (copy-keymap view-minor-mode-map))) (set-keymap-name map 'view-mode-map) map)) ;;;###autoload (defun view-file (filename &optional other-window-p) "Find FILENAME, enter view mode. With prefix arg OTHER-WINDOW-P, use other window." (interactive "fView File: \nP") (let ((old-p (get-file-buffer filename)) (obuf (current-buffer))) (if other-window-p (find-file-other-window filename) (find-file filename)) (view-mode (if other-window-p nil obuf) (if old-p nil 'kill-buffer)) nil)) ;;;###autoload (defun view-buffer (buffer &optional other-window-p) "Switch to BUFFER, enter view mode. With prefix arg use other window." (interactive "bView Buffer: \nP") (let ((obuf (current-buffer))) (if other-window-p (switch-to-buffer-other-window buffer) (switch-to-buffer buffer)) (view-mode (if other-window-p nil obuf) (if other-window-p nil 'bury-buffer)))) ;;;###autoload (defun view-file-other-window (filename) "Find FILENAME in other window, and enter view mode." (interactive "fView File: ") (view-file filename t)) ;;;###autoload (defun view-buffer-other-window (buffer) "Switch to BUFFER in another window, and enter view mode." (interactive "bView Buffer: ") (view-buffer buffer t)) (defun view-brief-help () (message (substitute-command-keys "\\<view-minor-mode-map>\\[scroll-up] = page forward; \\[scroll-down] = page back; \ \\[view-mode-describe] = help; \\[view-quit] = quit."))) (defvar view-major-mode) (defvar view-exit-position) (defvar view-prev-buffer) (defvar view-exit-action) (defvar view-old-buffer-read-only) ;;;###autoload (defun view-minor-mode (&optional prev-buffer exit-action) "Minor mode for viewing text, with bindings like `less'. Commands are: \\<view-minor-mode-map> 0..9 prefix args - prefix minus \\[scroll-up] page forward \\[scroll-down] page back \\[view-scroll-lines-up] scroll prefix-arg lines forward, default 1. \\[view-scroll-lines-down] scroll prefix-arg lines backward, default 1. \\[view-scroll-some-lines-down] scroll prefix-arg lines backward, default 10. \\[view-scroll-some-lines-up] scroll prefix-arg lines forward, default 10. \\[what-line] print line number \\[view-mode-describe] print this help message \\[view-search-forward] regexp search, uses previous string if you just hit RET \\[view-search-backward] as above but searches backward \\[view-repeat-search] repeat last search \\[view-goto-line] goto line prefix-arg, default 1 \\[view-last-windowful] goto line prefix-arg, default last line \\[view-goto-percent] goto a position by percentage \\[toggle-truncate-lines] toggle truncate-lines \\[view-file] view another file \\[view-buffer] view another buffer \\[view-cleanup-backspaces] cleanup backspace constructions \\[shell-command] execute a shell command \\[shell-command-on-region]\ execute a shell command with the region as input \\[view-quit] exit view-mode, and bury the current buffer. If invoked with the optional (prefix) arg non-nil, view-mode cleans up backspace constructions. More precisely: \\{view-minor-mode-map}" (interactive) (make-local-variable 'view-default-lines) (set (make-local-variable 'view-exit-position) (point)) (set (make-local-variable 'view-prev-buffer) prev-buffer) (set (make-local-variable 'view-exit-action) exit-action) (set (make-local-variable 'view-old-buffer-read-only) buffer-read-only) (add-hook (make-local-variable 'change-major-mode-hook) 'view-fixup-read-only) (setq view-minor-mode t buffer-read-only t) (view-brief-help)) ;;;###autoload (defun view-mode (&optional prev-buffer exit-action clean-bs) "View the current buffer using view-minor-mode. This exists to be 99.9% compatible with the implementations of `view-mode' in view.el and older versions of view-less.el." (interactive (list nil 'bury-buffer current-prefix-arg)) ;; #### - The first two arguments provide compatibility with view.el (and ;; thus FSFmacs), while the third argument as a prefix argument maintains ;; interactive compatibility with older versions of view-less. --Stig (if clean-bs (cleanup-backspaces)) (view-minor-mode prev-buffer exit-action)) ;;;###autoload (defun view-major-mode (&optional prev-buffer exit-action clean-bs) "View the current buffer using view-mode, as a major mode. This function has a nonstandard name because `view-mode' is wrongly named but is like this for compatibility reasons." ;; #### - The first two arguments provide compatibility with view.el (and ;; thus FSFmacs), while the third argument as a prefix argument maintains ;; interactive compatibility with older versions of view-less. --Stig (interactive (list nil 'bury-buffer current-prefix-arg)) (kill-all-local-variables) (use-local-map view-mode-map) (setq major-mode 'view-mode) (set (make-local-variable 'view-exit-position) (point)) (set (make-local-variable 'view-prev-buffer) prev-buffer) (set (make-local-variable 'view-exit-action) exit-action) (set (make-local-variable 'view-old-buffer-read-only) buffer-read-only) (set (make-local-variable 'view-major-mode) t) (setq buffer-read-only t) (if clean-bs (cleanup-backspaces)) (run-hooks 'view-mode-hook)) ;;;###autoload (defun auto-view-mode () "If the file of the current buffer is not writable, call view-mode. This is meant to be added to `find-file-hooks'." (or (file-writable-p buffer-file-name) (view-minor-mode))) (defun view-fixup-read-only () ;; doing M-x normal mode should NOT leave the buffer read-only (and (boundp 'view-old-buffer-read-only) (progn (setq buffer-read-only view-old-buffer-read-only) (kill-local-variable 'view-old-buffer-read-only)))) (defun view-quit-toggle-ro () "Exit view mode and execute the global binding of the key that invoked this command. Normally, this will toggle the state of `buffer-read-only', perhaps invoking some version-control mechanism." (interactive) (setq view-exit-position nil) ;; Kludge so this works as advertised. Stig, why can't you write ;; bug-free code??? (let ((buffer-read-only buffer-read-only)) (view-quit t)) ;; no longer in view-minor-mode, so the keymap has changed... (call-interactively (key-binding (this-command-keys)))) (defun view-quit (&optional no-exit-action) "Exit view mode. With prefix argument, keep the current buffer selected." (interactive "P") (view-fixup-read-only) (setq view-minor-mode nil) (if view-exit-position (goto-char view-exit-position)) (if (and (boundp 'view-major-mode) view-major-mode) (fundamental-mode) (let ((pbuf view-prev-buffer) (exitact view-exit-action)) (if no-exit-action nil (if exitact (funcall exitact (current-buffer))) (if pbuf (switch-to-buffer pbuf)))))) ;; #### - similar to what's in man.el and this ought to be written in C anyway... --Stig (defun cleanup-backspaces () "Cleanup backspace constructions. _^H and ^H_ sequences are deleted. x^Hx sequences are turned into x for all characters x. ^^H| and |^H^ sequences are turned into ^. +^Ho and o^H+ are turned into (+)." (interactive) (save-excursion (goto-char (point-min)) (while (= (following-char) ?\C-h) (delete-char 1)) (while (search-forward "\C-h" nil t) (backward-char 2) (cond ((looking-at "_\C-h\\|\\(.\\)\C-h\\1\\||\C-h\\^") (delete-char 2)) ((looking-at ".\C-h_\\|\\^\C-h|") (forward-char 1) (delete-char 2)) ((looking-at "+\C-ho\\|o\C-h+") (delete-char 3) (insert "(+)")) ((looking-at "|\C-h-") (delete-char 3) (insert "*")) (t (forward-char 2)))))) (defun view-cleanup-backspaces () "Cleanup backspaces and if buffer is currently unmodified, don't flag it as a modified buffer. This works even if the buffer is read-only." (interactive) (let ((buffer-read-only) (buf-mod (buffer-modified-p))) (cleanup-backspaces) ;; #### - THIS IS PROBABLY A REALLY DANGEROUS THING TO DO IN A MINOR MODE!! (set-buffer-modified-p buf-mod))) ;;;###autoload (defun toggle-truncate-lines (&optional p) "Toggles the values of truncate-lines. Positive prefix arg sets, negative disables." (interactive "P") (setq truncate-lines (if p (> (prefix-numeric-value p) 0) (not truncate-lines))) (recenter)) (defun view-scroll-lines-up (p) "Scroll up prefix-arg lines, default 1." (interactive "p") (scroll-up p)) (defun view-scroll-lines-down (p) "Scroll down prefix-arg lines, default 1." (interactive "p") (scroll-up (- p))) (defun view-scroll-some-lines-down (&optional n) "Scroll down prefix-arg lines, default 10, or last argument." (interactive "p") (if (> n 1) (setq view-default-lines n)) (scroll-down view-default-lines)) (defun view-scroll-some-lines-up (&optional n) "Scroll up prefix-arg lines, default 10, or last argument." (interactive "p") (if (> n 1) (setq view-default-lines n)) (scroll-up view-default-lines)) (defun view-goto-line (&optional n) "Goto prefix arg line N. N = 1 by default.." (interactive "p") (goto-line n)) (defun view-last-windowful (&optional n) "Goto prefix arg line N or the first line of the last windowful in buffer." (interactive "p") (if current-prefix-arg (goto-line n) (end-of-buffer) (recenter -1) (move-to-window-line 0))) (defun view-goto-percent (&optional percent) "Set mark and go to a position PERCENT way into the current buffer." (interactive "p") (set-mark-command nil) (goto-char (+ (point-min) (/ (* percent (- (point-max) (point-min))) 100))) (beginning-of-line)) (defun view-mode-describe () (interactive) (let ((mode-name "View") (major-mode 'view-mode)) (describe-mode))) (defun view-search-forward (s p) "Search forward for REGEXP. If regexp is empty, use last search string. With prefix ARG, search forward that many occurrences." (interactive "sView search: \np") (unwind-protect (re-search-forward (if (string-equal "" s) view-search-string s) nil nil p) (setq view-search-arg p) (or (string-equal "" s) (setq view-search-string s)))) (defun view-search-backward (s p) "Search backward for REGEXP. If regexp is empty, use last search string. With prefix ARG, search forward that many occurrences." (interactive "sView search backward: \np") (view-search-forward s (- p))) (defun view-repeat-search (p) "Repeat last view search command. If a prefix arg is given, use that instead of the previous arg, if the prefix is just a -, then take the negative of the last prefix arg." (interactive "P") (view-search-forward view-search-string (cond ((null p) view-search-arg) ((eq p '-) (- view-search-arg)) (t (prefix-numeric-value p))))) (provide 'view) (provide 'view-less) ;;; view-less.el ends here