114 lines
2.9 KiB
Plaintext
114 lines
2.9 KiB
Plaintext
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#! /usr/bin/perl -w
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# Script to take the output of nroff -man and remove all the backspacing and
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# the page footers and the screen commands etc so that it is more usefully
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# readable online. In fact, in the latest nroff, intermediate footers don't
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# seem to be generated any more.
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$blankcount = 0;
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$lastwascut = 0;
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$firstheader = 1;
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# Input on STDIN; output to STDOUT.
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while (<STDIN>)
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{
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s/\x1b\[\d+m//g; # Remove screen controls "ESC [ number m"
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s/.\x8//g; # Remove "char, backspace"
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# Handle header lines. Retain only the first one we encounter, but remove
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# the blank line that follows. Any others (e.g. at end of document) and the
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# following blank line are dropped.
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if (/^PCRE(\w*)\(([13])\)\s+PCRE\1\(\2\)$/)
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{
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if ($firstheader)
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{
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$firstheader = 0;
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print;
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$lastprinted = $_;
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$lastwascut = 0;
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}
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$_=<STDIN>; # Remove a blank that follows
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next;
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}
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# Count runs of empty lines
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if (/^\s*$/)
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{
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$blankcount++;
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$lastwascut = 0;
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next;
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}
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# If a chunk of lines has been cut out (page footer) and the next line
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# has a different indentation, put back one blank line.
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if ($lastwascut && $blankcount < 1 && defined($lastprinted))
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{
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($a) = $lastprinted =~ /^(\s*)/;
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($b) = $_ =~ /^(\s*)/;
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$blankcount++ if ($a ne $b);
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}
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# We get here only when we have a non-blank line in hand. If it was preceded
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# by 3 or more blank lines, read the next 3 lines and see if they are blank.
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# If so, remove all 7 lines, and remember that we have just done a cut.
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if ($blankcount >= 3)
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{
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for ($i = 0; $i < 3; $i++)
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{
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$next[$i] = <STDIN>;
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$next[$i] = "" if !defined $next[$i];
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$next[$i] =~ s/\x1b\[\d+m//g; # Remove screen controls "ESC [ number m"
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$next[$i] =~ s/.\x8//g; # Remove "char, backspace"
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}
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# Cut out chunks of the form <3 blanks><non-blank><3 blanks>
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if ($next[0] =~ /^\s*$/ &&
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$next[1] =~ /^\s*$/ &&
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$next[2] =~ /^\s*$/)
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{
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$blankcount -= 3;
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$lastwascut = 1;
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}
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# Otherwise output the saved blanks, the current, and the next three
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# lines. Remember the last printed line.
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else
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{
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for ($i = 0; $i < $blankcount; $i++) { print "\n"; }
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print;
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for ($i = 0; $i < 3; $i++)
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{
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$next[$i] =~ s/.\x8//g;
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print $next[$i];
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$lastprinted = $_;
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}
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$lastwascut = 0;
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$blankcount = 0;
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}
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}
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# This non-blank line is not preceded by 3 or more blank lines. Output
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# any blanks there are, and the line. Remember it. Force two blank lines
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# before headings.
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else
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{
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$blankcount = 2 if /^\S/ && !/^Last updated/ && !/^Copyright/ &&
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defined($lastprinted);
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for ($i = 0; $i < $blankcount; $i++) { print "\n"; }
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print;
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$lastprinted = $_;
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$lastwascut = 0;
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$blankcount = 0;
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}
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}
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# End
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