From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Sun, 29 Nov 2009 13:01:33 -0600
Message-ID: <d50d7d460911291101k7420eb0fna61f87646606e991@mail.gmail.com>
From: Jason Catena <jason.catena@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: [9fans] =?iso-8859-1?q?gr=EBp_=28rhymes_with_creep=29_and_cptmp?=
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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 artificia=
l

$ gr=EBp fa=E7ade *
style:21: crucial difference to pronunciation: clich=E9, soup=E7on, fa=E7ad=
e, caf=E9,
wabisabi:51: or the crumbling stone fa=E7ade of an old building.   Transien=
ce,
word:89: to bow to man. fa=E7ade. circa 1681.  French fa=E7ade, from Italia=
n


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

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