85 lines
2.4 KiB
Perl
85 lines
2.4 KiB
Perl
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#!/usr/bin/perl -w
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use Text::Wrap;
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my $test_text =
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"Change from Melissa O'Neill <oneill at cs.sfu.ca>:
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Removed some superfluous tests from conditionals (it's true that they
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make it clear what is true at that point, but that could be expressed
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in a comment, rather than in executed code). (Unfortunately, this
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meant that I outdented a fairly large chunk of code, making the diff
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look like a more extensive change than it really is.)
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This paragraph has been entirely indented. It consists of six
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lines, each of which is indented by no less than three spaces.
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This paragraph has been entirely indented. It consists of six
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lines, each of which is indented by no less than three spaces.
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This paragraph has been entirely indented. It consists of six
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lines, each of which is indented by no less than three spaces.
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This script demonstrates a bug in Text::Wrap. The very long line of
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equal signs that ought to come right after this paragraph will be
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wrongly relocated:
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====================================================================
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See? When the bug happens, we'll get the line of equal signs below,
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even though it should be above.";
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### My reimplementation of Text::Wrap().
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sub my_wrap ()
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{
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my $initial_indent = shift;
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my $subsequent_indent = shift;
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my $text = shift;
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$text =~ s/\n/ /g;
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}
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# Print out the test text with no wrapping:
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print "$test_text";
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print "\n";
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print "\n";
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# Now print it out wrapped, and see the bug:
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print wrap ("\t", " ", "$test_text");
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print "\n";
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print "\n";
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__END__
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If the line of equal signs were one shorter, then the bug doesn't
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happen. Interesting.
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Anyway, rather than fix this in Text::Wrap, we might as well write a
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new wrap() which has the following much-needed features:
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* initial indentation, like current Text::Wrap()
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* subsequent line indentation, like current Text::Wrap()
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* user chooses among: force-break long words, leave them alone, or die()?
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* preserve existing indentation: chopped chunks from an indented line
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are indented by same (like this line, not counting the asterisk!)
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* optional list of things to preserve on line starts, default ">"
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Note that the last two are essentially the same concept, so unify in
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implementation and give a good interface to controlling them.
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And how about:
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Optionally, when encounter a line pre-indented by same as previous
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line, then strip the newline and refill, but indent by the same.
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Yeah...
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