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|
#!/usr/bin/perl -w
$doc = <<'';
# perl editor : edit files in place
#
# ped edits files via perl command(s) in place and saves a backup file.
#
# Files are loaded and edited in one chunk, not line by line.
# Symbolic and hard links are handled correctly, in opposition to
# "sed -i" or "perl -p -i -e" which breaks links.
# A file is assigend to $_, which you can modify with any Perl commands.
# ped can also edit STDIN in one chunk (multiline edit).
#
# Hint: use s/^.../.../gm to modify each line begin.
# 2016-09-11 keep hard and soft links
# 2016-09-14 added option -q
use Getopt::Std;
$0 =~ s:.*/::;
local $/;
$usage =
"usage: $0 [-n] [-v] [-q] 'perl command(s)' file(s)\n".
"options: -n no backup\n".
" -v verbose mode\n".
" -q quiet mode (no warnings)\n".
"example: $0 's/ /_/g' *.txt\n".
"\n".
"usage: ... | $0 'perl command(s)'\n".
"example: ifconfig | $0 's/(.+?)\\n\\n/{\$1\\n}\\n/sg'\n";
$opt_h = $opt_n = $opt_v = $opt_q = 0;
getopts('hnvq') or die $usage;
if ($opt_h) {
print $doc,"\n",$usage;
exit;
}
$opt_q = 0 if $opt_v;
$cmd = shift or die $usage;
if ($vv = pathsearch('vv') and slurp($vv) !~ /visual versioning/) {
$vv = '';
}
$STDOUT = '';
tie *STDOUT => "Buffer",\$STDOUT;
if (@ARGV) {
foreach $file (@ARGV) {
unless (-e $file) {
$status = 2;
warn "$0: $file does not exist\n";
next;
}
unless (-f $file) {
$status = 3;
warn "$0: $file is not a regular file\n";
next;
}
unless (-w $file) {
$status = 4;
warn "$0: no write permission for $file\n";
next;
}
$file = realfilename($file) if -l $file;
@stat = stat $file;
$fid = $stat[0].':'.$stat[1];
if ($fhl = $file{$fid}) {
if (not $opt_q and $file ne $fhl) {
warn "$0: ignoring hard link $file of $fhl\n";
}
next;
}
$file{$fid} = $file;
unless (open $file,'+>>',$file) {
$status = $?;
warn "$0: cannot write $file - $!\n";
next;
}
seek $file,0,0;
$_ = $__ = <$file>;
eval $cmd;
$_ .= $STDOUT;
if ($@) {
$status = 2;
warn "$0: $@";
} elsif ($_ eq $__) {
warn "$0: $file not modified\n" if $opt_v;
} else {
unless ($opt_n) {
if ($vv) {
if ($opt_v) {
print STDERR "$0: creating backup file: ";
system qw'vv -vs',$file
} else {
system qw'vv -sq',$file
}
} else {
warn "$0: creating backup file $file~\n" if $opt_v;
system qw'rsync -aA',$file,"$file~";
}
}
truncate $file,0;
seek $file,0,0;
print {$file} $_;
$status ||= 0;
warn "$0: $file modified\n" if $opt_v;
}
close $file;
}
if (defined $status) { exit $status } else { exit 99 }
} else {
$_ = <STDIN>;
eval $cmd;
die "$0: $@" if $@;
$^W = 0;
untie *STDOUT;
$_ .= $STDOUT;
print;
exit;
}
# resolve symlinks
sub realfilename {
my $file = shift;
if (-e $file) {
if (-l $file) {
my $link = readlink($file);
if ($link !~ /^\// and $file =~ m:(.*/).:) {
$link = $1 . $link;
}
return realfilename($link);
} else {
return $file;
}
} else {
return undef;
}
}
sub pathsearch {
my $prg = shift;
foreach my $dir (split(':',$ENV{PATH})) {
return "$dir/$prg" if -x "$dir/$prg";
}
}
sub slurp {
my $file = shift;
local $_;
local $/;
if (open $file,$file) {
$_ = <$file>;
close $file;
}
return $_;
}
# tie STDOUT to buffer variable (redefining print and printf)
package Buffer;
sub TIEHANDLE {
my ($class,$buffer) = @_;
bless $buffer,$class;
}
sub PRINT {
my $buffer = shift;
$$buffer .= $_ foreach @_;
}
sub PRINTF {
my $buffer = shift;
my $fmt = shift @_;
$$buffer .= sprintf($fmt,@_);
}
1;
|
