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#!/usr/local/bin/perl
#
# Heuristically converts line endings to the current OS's preferred format
#
# All existing line endings must be identical (e.g. lf's only, or even
# the accedental cr.cr.lf sequence.) If some lines end lf, and others as
# cr.lf, the file is presumed binary. If the cr character appears anywhere
# except prefixed to an lf, the file is presumed binary. If there is no
# change in the resulting file size, or the file is binary, the conversion
# is discarded.
#
# Todo: Handle NULL stdin characters gracefully.
#
use IO::File;
use File::Find;
# The ignore list is '-' seperated, with this leading hyphen and
# trailing hyphens in ever concatinated list below.
$ignore = "-";
# Image formats
$ignore .= "gif-jpg-jpeg-png-ico-bmp-";
# Archive formats
$ignore .= "tar-gz-z-zip-jar-war-bz2-tgz-";
# Many document formats
$ignore .= "eps-psd-pdf-chm-ai-";
# Some encodings
$ignore .= "ucs2-ucs4-";
# Some binary objects
$ignore .= "class-so-dll-exe-obj-lib-a-o-lo-slo-sl-dylib-";
# Some build env files
$ignore .= "mcp-xdc-ncb-opt-pdb-ilk-exp-res-pch-idb-sbr-";
$preservedate = 1;
$forceending = 0;
$givenpaths = 0;
$notnative = 0;
while (defined @ARGV[0]) {
if (@ARGV[0] eq '--touch') {
$preservedate = 0;
}
elsif (@ARGV[0] eq '--nocr') {
$notnative = -1;
}
elsif (@ARGV[0] eq '--cr') {
$notnative = 1;
}
elsif (@ARGV[0] eq '--force') {
$forceending = 1;
}
elsif (@ARGV[0] eq '--FORCE') {
$forceending = 2;
}
elsif (@ARGV[0] =~ m/^-/) {
die "What is " . @ARGV[0] . " supposed to mean?\n\n"
. "Syntax:\t$0 [option()s] [path(s)]\n\n" . <<'OUTCH'
Where: paths specifies the top level directory to convert (default of '.')
options are;
--cr keep/add one ^M
--nocr remove ^M's
--touch the datestamp (default: keeps date/attribs)
--force mismatched corrections (unbalanced ^M's)
--FORCE all files regardless of file name!
OUTCH
}
else {
find(\&totxt, @ARGV[0]);
print "scanned " . @ARGV[0] . "\n";
$givenpaths = 1;
}
shift @ARGV;
}
if (!$givenpaths) {
find(\&totxt, '.');
print "did .\n";
}
sub totxt {
$oname = $_;
$tname = '.#' . $_;
if (!-f) {
return;
}
@exts = split /\./;
if ($forceending < 2) {
while ($#exts && ($ext = pop(@exts))) {
if ($ignore =~ m|-$ext-|i) {
return;
}
}
}
return if ($File::Find::dir =~ m|^(.+/)?.svn(/.+)?$|);
@ostat = stat($oname);
$srcfl = new IO::File $oname, "r" or die;
$dstfl = new IO::File $tname, "w" or die;
binmode $srcfl;
if ($notnative) {
binmode $dstfl;
}
undef $t;
while (<$srcfl>) {
if (s/(\r*)\n$/\n/) {
$n = length $1;
if (!defined $t) {
$t = $n;
}
if (!$forceending && (($n != $t) || m/\r/)) {
print "mismatch in " .$oname. ":" .$n. " expected " .$t. "\n";
undef $t;
last;
}
elsif ($notnative > 0) {
s/\n$/\r\n/;
}
}
print $dstfl $_;
}
if (defined $t && (tell $srcfl == tell $dstfl)) {
undef $t;
}
undef $srcfl;
undef $dstfl;
if (defined $t) {
unlink $oname or die;
rename $tname, $oname or die;
@anames = ($oname);
if ($preservedate) {
utime $ostat[9], $ostat[9], @anames;
}
chmod $ostat[2] & 07777, @anames;
chown $ostat[5], $ostat[6], @anames;
print "Converted file " . $oname . " to text in " . $File::Find::dir . "\n";
}
else {
unlink $tname or die;
}
}
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