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#!/usr/bin/perl
#-
# Copyright (C) 2011, 2012 Mikolaj Izdebski
# Copyright (C) 2008, 2009, 2010 Laszlo Ersek
#
# 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 3 of the License, 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
use Text::Wrap;
$il = 2; # indentation level
$lw = 19; # label width
$sw = 80; # screen width
$ind = ' 'x$il;
undef $Text::Wrap::unexpand;
while (<DATA>) {
if (!/^@(.*)/) { $s.=$_; next }
$label=$1;
@d=();
while (<DATA>) {
last unless /./;
chop;
push @d,$_;
}
$desc = join " ", @d;
$Text::Wrap::columns = $lw+$il;
$s .= wrap $ind,$ind,$label;
$s =~ s/\n([^\n]*)$/\n/; $t=$1;
$t .= ' 'x($il+$lw-length$t);
$Text::Wrap::columns = $sw;
$s .= wrap "$t: ",' 'x($il+$lw+2),$desc;
$s .= "\n";
}
@c = map {s/\n/\\n/g; $_} grep {/./} split /([^\0]{509})/, $s;
unshift @c,'%s'x@c;
$_ = join '", "', @c;
$_ = "#define USAGE_STRING \"$_\"";
$s = "";
while (1) {
if (length($_) <= 77) {
$s.="$_\n";
last;
}
/^(.{77}[^\\]?)(.*)$/;
$s.="$1\\\n";
$_="$2";
}
open F, "src/main.c" or die;
undef $/; $_=<F>;
s/#define USAGE_STRING.*(.*\\\n)*.*[^\\]\n/$s\n/ or die;
open F, ">src/main.c" or die;
print F;
__END__
Usage:
1. PROG [-n WTHRS] [-k|-c|-t] [-d|-z] [-1 .. -9] [-f] [-v] [-S] {FILE}
2. PROG -h|-V
Recognized PROG names:
@bunzip2, lbunzip2
Decompress. Forceable with `-d'.
@bzcat, lbzcat
Decompress to stdout. Forceable with `-cd'.
@<otherwise>
Compress. Forceable with `-z'.
Environment variables:
@LBZIP2, BZIP2, BZIP
Insert arguments between PROG and the rest of the command line. Tokens are
separated by spaces and tabs; no escaping.
Options:
@-n WTHRS
Set the number of (de)compressor threads to WTHRS, where WTHRS is a positive
integer.
@-k, --keep
Don't remove FILE operands. Open regular input files with more than one link.
@-c, --stdout
Write output to stdout even with FILE operands. Implies `-k'. Incompatible
with `-t'.
@-t, --test
Test decompression; discard output instead of writing it to files or stdout.
Implies `-k'. Incompatible with `-c'.
@-d, --decompress
Force decompression over the selection by PROG.
@-z, --compress
Force compression over the selection by PROG.
@-1 .. -9
Set the compression block size to 100K .. 900K.
@--fast
Alias for `-1'.
@--best
Alias for `-9'. This is the default.
@-f, --force
Open non-regular input files. Open input files with more than one link. Try to
remove each output file before opening it. With `-cd' copy files not in bzip2
format.
@-s, --small
Reduce memory usage at cost of performance.
@-u, --sequential
Perform splitting input blocks sequentially. This may improve compression ratio
and decrease CPU usage, but will degrade scalability.
@-v, --verbose
Log each (de)compression start to stderr. Display compression ratio and space
savings. Display progress information if stderr is connected to a terminal.
@-S
Print condition variable statistics to stderr.
@-q, --quiet, --repetitive-fast, --repetitive-best, --exponential
Accepted for compatibility, otherwise ignored.
@-h, --help
Print this help to stdout and exit.
@-L, --license, -V, --version
Print version information to stdout and exit.
Operands:
@FILE
Specify files to compress or decompress. If no FILE is given, work as a
filter. FILEs with `.bz2', `.tbz', `.tbz2' and `.tz2' name suffixes will be
skipped when compressing. When decompressing, `.bz2' suffixes will be removed
in output filenames; `.tbz', `.tbz2' and `.tz2' suffixes will be replaced by
`.tar'; other filenames will be suffixed with `.out'.
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