Re: [MacPerl] Perl Filter Demos?

[Ken Williams <ken@forum.swarthmore.edu>]

I don't tend to use filters much, but I thought a little and here are a
few I came up with.


1) Number the lines in selected region.  It's useful when you want to
number the lines starting with 1 somewhere in the middle of the file.

  #!perl -n
  printf("%4d: $_",++$i);

2) Reverse the elements of all comma-separated lists in the region.  For
instance, turn (one, two, "three", 4) into (4, "three", two, one).

  #!perl -p
  s/\((.*?)\)/
    '('. join ('', reverse split m{(\s*,\s*)}, $1) . ')'
  /eg;

3) Alphabetical list of all words in the selection.

  #!perl -nl
  @h{/(\w+)/g} = ();
  END { foreach (sort {lc $a cmp lc $b} keys %h) {print} }




rdm@cfcl.com (Rich Morin) wrote:
>BBEdit (a fine GUI-based text editor for Macs) is capable of running
>MacPerl-based filters on selected text.  I understand that some other
>editors (e.g., vim) also have this capability.
>
>I would love to have some intriguing demo filters on hand at WWDC (the
>Apple World Wide Developers Conference) in a week or so.  They should
>have a strong "Gee Whiz!" factor.  It would also be nice if they can
>be explained to mortal programmers...
>
>Does anyone feel like suggesting (or even coding up :-) something?
>
>-r
>--
>Rich Morin:          rdm@cfcl.com, +1 650-873-7841, http://www.ptf.com/~rdm
>Prime Time Freeware: info@ptf.com, +1 408-433-9662, http://www.ptf.com
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  -------------------                            -------------------
  Ken Williams                             Last Bastion of Euclidity
  ken@forum.swarthmore.edu                            The Math Forum



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