#!/usr/bin/env perl
# Look for and count the blanks or tabs at the end of lines
# --Kent Nassen, 5/26/99, 6/11/99, 6/28/00

# 6/28/00: only print longest string of whitespace message if the file
# had trailing whitespace.  Added run_time to header.

# TODO:
#   update to use a new header for each file. See for example
#   the longline program.

use FileHandle;
use Getopt::Std;

#use strict;
# Can't use string ("fh01") as a symbol ref while "strict refs" in use
# at cktb line 50.

use vars qw($file $filename $input $line $len $whitespace $match
  $matchcount $ProgName $version $pagesize $longest $longline $opt_l
  $run_time);

$pagesize=54;
STDOUT->format_lines_per_page($pagesize);

$version="v1.1, 6/11/99";
$run_time=localtime(time);


#($ProgName = $0) =~ s%.*/%%; # Unix
($ProgName = lc $0) =~ s%.*\\%%;  # DOS

die "\n*** $ProgName: need a filename to test. \n\
$ProgName: Find lines with trailing white space (tabs or spaces) in files,\
      by Kent Nassen, $version\n\
     Usage: $ProgName [-l] filename [filename...]\
            where -l gives long output, instead of a summary.\n\n"
        unless defined($file=$ARGV[0]);

getopts('l');

# Print program header
if (!$opt_l) { print "   $ProgName: Find lines with trailing spaces or tabs,",
    " by Kent Nassen, $version\n   Report generated: $run_time\n";
    }

# Check a file for trailing blanks/white space
foreach $file (@ARGV) {
    process($file, 'fh00');
}

sub process {
    # Print Header?
    $line=$matchcount=$match=$longest=$longline=0;
    local($filename, $input) = @_;
    $input++;
    unless (open $input, $filename) {
        print STDERR "\n  $ProgName: *** Can't open $filename: $!\n\n";
        return;
    }
    while (<$input>) {
        chomp;
        $line++;
        if (/([\t\s]+)$/) {
            $match=$1;
            $matchcount++;
            if (length($match)>$longest) {
                $longest=length($match); $longline=$line
            }
            if ($opt_l) { write } # do long report (line# & count)
        }
    } # end of while()
    if (!$matchcount) {
        print "\n   *** No lines found with trailing white space";
        $longest=0;
        $longline=$line
    }
    print "\n   $line total lines in the file '$file'.\n";
    if ($matchcount) {
        print "   Longest string of trailing whitespace was $longest",
                " characters at line $longline.\n\n";
    }
    $longest=$longline=0;
    close $input;
}

format STDOUT_TOP =

   @||||@||
   "Page",$%

   @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
   "$ProgName: Find lines with trailing spaces or tabs, by Kent Nassen, $version";
   @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<@<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
   "Scanning for trailing white space in the file: ",$file
   @<<<<<<<<<<<<<<<<<@<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
   "Report generated: ",$run_time

              Trailing WS
     Line#       Length
    -------   -----------
.

format STDOUT =
    @>>>>>> @>>>>>>>>>
$line, length($match)
.

Back to Kent's Perl Page