FreeBSD/Linux Kernel Cross Reference
sys/scripts/checkincludes.pl

     #!/usr/bin/perl
     #
     # checkincludes: find/remove files included more than once
     #
     # Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
     # Copyright 2009 Luis R. Rodriguez <mcgrof@gmail.com>
     #
     # This script checks for duplicate includes. It also has support
     # to remove them in place. Note that this will not take into
    # consideration macros so you should run this only if you know
    # you do have real dups and do not have them under #ifdef's. You
    # could also just review the results.
    
    use strict;
    
    sub usage {
            print "Usage: checkincludes.pl [-r]\n";
            print "By default we just warn of duplicates\n";
            print "To remove duplicated includes in place use -r\n";
            exit 1;
    }
    
    my $remove = 0;
    
    if ($#ARGV < 0) {
            usage();
    }
    
    if ($#ARGV >= 1) {
            if ($ARGV[0] =~ /^-/) {
                    if ($ARGV[0] eq "-r") {
                            $remove = 1;
                            shift;
                    } else {
                            usage();
                    }
            }
    }
    
    foreach my $file (@ARGV) {
            open(my $f, '<', $file)
                or die "Cannot open $file: $!.\n";
    
            my %includedfiles = ();
            my @file_lines = ();
    
            while (<$f>) {
                    if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
                            ++$includedfiles{$1};
                    }
                    push(@file_lines, $_);
            }
    
            close($f);
    
            if (!$remove) {
                    foreach my $filename (keys %includedfiles) {
                            if ($includedfiles{$filename} > 1) {
                                    print "$file: $filename is included more than once.\n";
                            }
                    }
                    next;
            }
    
            open($f, '>', $file)
                or die("Cannot write to $file: $!");
    
            my $dups = 0;
            foreach (@file_lines) {
                    if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
                            foreach my $filename (keys %includedfiles) {
                                    if ($1 eq $filename) {
                                            if ($includedfiles{$filename} > 1) {
                                                    $includedfiles{$filename}--;
                                                    $dups++;
                                            } else {
                                                    print {$f} $_;
                                            }
                                    }
                            }
                    } else {
                            print {$f} $_;
                    }
            }
            if ($dups > 0) {
                    print "$file: removed $dups duplicate includes\n";
            }
            close($f);
    }

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