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Re: Improve the use of GNU readline

From: Thomas Walter
Subject: Re: Improve the use of GNU readline
Date: Tue, 13 Apr 1999 10:41:15 +0200

>>>>> "John" == John W Eaton <address@hidden> writes:

    John> On  7-Apr-1999, Thomas Walter <address@hidden> wrote:
    John> | has anybody investigated some time on the use of GNU readline in
    John> | 'octave' ?
    John> | 
    John> | The improvement I mean is to add a new entry in the history only if
    John> | the current line has changed compared with the previous line.

    John> I don't know of anyone who has done this.  If anyone is interested in
    John> working on it, I think it would be best to do something similar to the
    John> HISTCONTROL feature from bash, though it might be better to use a
    John> regular expression match instead of a shell pattern match.

Currently I do not know anything about this feature.

My idea about adding new entries to the history list is this:
Nothing with regular expressions and / or shell pattern.

+ Read a new command line
+ Compare this line with the top most entry in the history list
+ If they differ add it to the history else don't.

For speed string compare may slow down your response:
+ first compare the first characters of the two strings
+ if they are equal
    convert the first 4 characters of each string to an unsigend
    32-bit integer and compare them
+ if this is still equal do a string compare

I would give it a try, but I'm not so familiar with C++ and the
affected code to do the changes.



"Beweiss" fuer die These: 'Alle ungeraden Zahlen sind prim.'
3, 5, 7, 11, alle sind ungerade und prim.
9 ist ist ein irrelevanter Messfehler.
==> Bingo!  8-))))))

Dipl. Phys. Thomas Walter
Inst. f. Physiklische Chemie II
Egerlandstr. 3                          Tel.: ++9131-85 27326 / 27330
91058 Erlangen, Germany                 email: address@hidden

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