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Date: Mon, 30 Nov 2009 15:51:51 +1100
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From: Bruce Ellis <bruce.ellis@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans]
	=?iso-8859-1?q?gr=EBp_=28rhymes_with_creep=29_and_cptmp?=
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i like the approach. back in basser computational linguistics days
frank was indexing a greek verb dictionary. to sort the keys - he used
tr | sort | tr.

i'm glad you didn't screw with grep. it's brilliant but the
implementation is not easily understood. i was in the room at the
time, so i have a headstart.

brucee

On 11/30/09, Jason Catena <jason.catena@gmail.com> wrote:
> I wrote a wrapper around grep to search for words regardless of
> accents.  I didn't want to worry about whether I used accents on
> characters (I sometimes use them inconsistently, and others decidedly
> do), but I still wanted to limit the results to exact matches if I
> supplied an accent.  Here's an example run.
>
>
> $ grep facade word
> treatment <a museum's east facade>.  A false, superficial, or artificial
>
> $ gr=EBp facade word
> 89: to bow to man. fa=E7ade. circa 1681.  French fa=E7ade, from Italian
> 92: treatment <a museum's east facade>.  A false, superficial, or artific=
ial
>
> $ gr=EBp fa=E7ade *
> style:21: crucial difference to pronunciation: clich=E9, soup=E7on, fa=E7=
ade, caf=E9,
> wabisabi:51: or the crumbling stone fa=E7ade of an old building.   Transi=
ence,
> word:89: to bow to man. fa=E7ade. circa 1681.  French fa=E7ade, from Ital=
ian
>
>
> Note that line word:92 (output by the second command) is not output by
> the third command, since I supplied an accent on that particular
> character (=E7) in my input pattern.  I chose the umlaut or di=E6resis to
> remind me that gr=EBp provides the -n option by default, so I'll get a
> line number and : in the output.  (I should probably just pass through
> all of grep's command-line options.)
>
>
> <gr=EBp>=3D
> #!/usr/local/plan9/bin/rc
>
> regex=3D$1
> shift
>
> classes=3D`{cptmp classes}
> sed '/-/d;s,^\[(.),s/\1/\[\1,;s,$,/g,' charclass > $classes
>
> grep -n `{echo $regex | sed -f $classes} $*
>
>
> I translate each ordinary latin character in the input pattern (eg
> [0-9A-Za-z]) into a character class (the attached charclass file,
> which doesn't cut-and-paste well), and then call grep with the updated
> pattern.  The first sed command in gr=EBp turns the character classes in
> charclass into s commands for sed.  The charclass file contains the
> square brackets because I also use it to cut-and-paste from when I
> need a character class for a sed script.
>
> The script cptmp creates a temporary copy of an existing file, or a
> temporary new file.
>
>
> <cptmp>=3D
> #!/usr/local/plan9/bin/rc
> flag e +
>
> if(~ $#TMPDIR 0)
>        TMPDIR=3D/tmp
> base=3D`{basename $1}
> tmp=3D$TMPDIR/$base.$USER.$pid
>
> if (test -f $1) {
>        cp -pr $1 $tmp
> }
> if not {
>        touch $tmp
> }
> chmod +wx $tmp
> echo $tmp
>
>
> Jason Catena
>
>