37 lines
865 B
Perl
Executable file
37 lines
865 B
Perl
Executable file
#!/usr/bin/perl -an
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# field 1
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# field 3,1
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# field 6,2-3
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# field 6-
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# field 2,6-,2-3
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BEGIN {
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@ranges = split(/,/, shift);
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for (@ranges) {
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/^(\d+)$/ and push (@fields,($1-1));
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/^(\d+)-(\d+)$/ and push (@fields,($1-1) .. ($2-1));
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/^(\d+)-$/ and do {
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push (@fields,($1-1)." .. \$#F");
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$must_eval = 1;
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};
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}
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# Default: field 1
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if(not @fields) { @fields=(1-1); }
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# Perl counts from 0 - not from 1
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$fields = join(",", @fields);
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}
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if($must_eval) {
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if(not $Calc::f{$#F}) {
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# Eval is expensive, so only do it if we have not done before
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# If an argument ends in '-' then we must figure out the last field
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# which depends on the number of fields in the line
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$Calc::f{$#F}++;
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@{$Calc::fields->{$#F}} = eval $fields;
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}
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print join(" ",@F[@{$Calc::fields->{$#F}}]),"\n";
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} else {
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print join(" ",@F[@fields]),"\n";
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}
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