##e2ctags.pl
##Convert an Emacs-style TAGS file to a standard ctags file.
##Runs in a single pass over the TAGS file and keeps the first
##tag entry found, and the file name and line number the tag can
##be found on.
##Then it opens all relevant files and builds the regular expression
##for ctags.
##Run over a few test files and compared with a real ctags file shows
##only extra tags in the translated file, which probably won't hurt
##vi.
##
use strict;
my $filename;
my ($tag,$line_no,$line);
my %tags = ();
my %filetags = ();
my %files = ();
my @lines = ();
while (<>) {
if ($_ eq "\x0C\n") {
##Grab next line and parse it for the filename
$_ = <>;
chomp;
s/,\d+$//;
$filename = $_;
++$files{$filename};
next;
}
##Figure out how many records in this line and
##extract the tag name and the line that it is found on
next if /struct/;
if (/\x01/) {
($tag,$line_no) = /\x7F(\w+)\x01(\d+)/;
}
else {
tr/(//d;
($tag,$line_no) = /(\w+)\s*\x7F(\d+),/;
}
next unless $tag;
##Take only the first entry per tag
next if defined($tags{$tag});
$tags{$tag}{FILE} = $filename;
$tags{$tag}{LINE_NO} = $line_no;
push @{$filetags{$filename}}, $tag;
}
foreach $filename (keys %files) {
open FILE, $filename or die "Couldn't open $filename: $!\n";
@lines = <FILE>;
close FILE;
chomp @lines;
foreach $tag ( @{$filetags{$filename}} ) {
$line = $lines[$tags{$tag}{LINE_NO}-1];
if (length($line) >= 50) {
$line = substr($line,0,50);
}
else {
$line .= '$';
}
$line =~ s#\\#\\\\#;
$tags{$tag}{LINE} = join '', '/^',$line,'/';
}
}
foreach $tag ( sort keys %tags ) {
print "$tag\t$tags{$tag}{FILE}\t$tags{$tag}{LINE}\n";
}