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Re: [SVN-DEV] Re: Diff options

From: C. Scott Ananian <cananian_at_lesser-magoo.lcs.mit.edu>
Date: 2001-09-04 18:26:52 CEST

On 4 Sep 2001, Ben Collins-Sussman wrote:

> My feeling is: either have two switch-spaces, and be open about it, or
> have one, and be open about it. And I definitely vote for staying on
> the present course with one global space. I'm not sure that as GNU
> diff evolves, that Subversion *must* be able to take advantage of
> every new switch that it grows. Choose a reasonable subset of GNU
> diff switches, and reserve them in the Subversion global switch-space.
> We'll deal with the consequences.
>
> Thoughts?

Very bad, and this cuts the heart out of the 'user-selectable diff' idea.

Rather, let's use a 'diff options' option. Such as:

% svn diff -X "-ruHp" ...

I chose '-X' here as 'unknown' not as a particular suggested option flag.
Put the point being that by putting diff options into the *argument*
space, you can avoid polluting "option" space and still have the maximal
diff flexibility. Keep this option short! I don't want to keep typing
--with-diff-options-argument "-ruHp" ....

The "diff options argument" should be specifiable in a global .svnrc file
as well, of course.
 --s

NRA Moscow Attache United Nations strategic DNC Sugar Grove Diplomat
nuclear agent overthrow NSA General Peking Rule Psix domestic disruption
              ( http://lesser-magoo.lcs.mit.edu/~cananian )
 --
 "These students are going to have to find out what law and order is
 all about." -- Brig. General Robert Canterbury, Noon, May 4, 1970,
 minutes before his troops shot 13 unarmed Kent State students, killing 4.
 --
            [http://www.cs.cmu.edu/~dst/DeCSS/Gallery/]
#!/usr/bin/perl -w
# 526-byte qrpff, Keith Winstein and Marc Horowitz <sipb-iap-dvd@mit.edu>
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
$_='while(read+STDIN,$_,2048){$a=29;$c=142;if((@a=unx"C*",$_)[20]&48){$h=5;
$_=unxb24,join"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$d=
unxV,xb25,$_;$b=73;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=($t=255)&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<<9
,$_=(map{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t
^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)[$_%8]}(16..271))
[$_]^(($h>>=8)+=$f+(~$g&$t))for@a[128..$#a]}print+x"C*",@a}';s/x/pack+/g;eval

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Received on Sat Oct 21 14:36:39 2006

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