[9fans] sam mod for delete-forward

[9fans] sam mod for delete-forward

[Douglas A. Gwyn]

Recently I got tired of not being able to delete in front of the cursor
with DEL the way most other text editors work these days, so I changed
"samterm" to do that.  I made it conditional on DELFWD so you can compile
it to work either way; this could be made an environmental switch or
command-line option instead.  Or, my preference, officially change sam
to always work this way.

term% diff main.BAK main.c
488d487
< 			case '\b':
489a489,494
> #ifdef DELFWD	/* DAG -- want DEL key to delete forward, not backward */
> 				l->p0 = a;
> 				l->p1 = a<l->origin+l->f.nchars? a+1 : a;
> 				break;
> #endif
> 			case '\b':
490a496
> 				l->p1 = a;
493a500
> 				l->p1 = a;
496a504
> 				l->p1 = a;
499d506
< 			l->p1 = a;

Here is what the updated section of /sys/src/cmd/samterm/main.c looks like:

	}else if(backspacing && !hostlock){
		if(l->f.p0>0 && a>0){
			switch(c){
			case 0x7F:	/* del */
#ifdef DELFWD	/* DAG -- want DEL key to delete forward, not backward */
				l->p0 = a;
				l->p1 = a<l->origin+l->f.nchars? a+1 : a;
				break;
#endif
			case '\b':
				l->p0 = a-1;
				l->p1 = a;
				break;
			case 0x15:	/* ctrl-u */
				l->p0 = ctlu(&t->rasp, l->origin, a);
				l->p1 = a;
				break;
			case 0x17:	/* ctrl-w */
				l->p0 = ctlw(&t->rasp, l->origin, a);
				l->p1 = a;
				break;
			}
			if(l->p1 != l->p0){
				/* cut locally if possible */

Re: [9fans] sam mod for delete-forward

[Boyd Roberts]

Douglas A. Gwyn <DAGwyn@null.net> a crit dans le message :
> WHILE YOU'RE AT IT WHY NOT ADD DOSKEY FUNCTIONALITY TOO THE COMMAND
WINDOW?
> (There were unnecessary figure/letter shifts around the spaces.)

While I've rarely agreed with you I know you're no fool.

Re: [9fans] sam mod for delete-forward

[Douglas A. Gwyn]

Dan Cross wrote:
> It's a paper tape image.  I'm not sure what the text says, though.

Since it has 5 levels, one assumes it uses Baudot code.
(He may have put the sprocket track in the wrong row.)
Translating:
WHILE YOU'RE AT IT WHY NOT ADD DOSKEY FUNCTIONALITY TOO THE COMMAND WINDOW?
(There were unnecessary figure/letter shifts around the spaces.)

Re: [9fans] sam mod for delete-forward

[Dan Cross]

In article <01032709015600.08511@softnet> you write:
>At the risk of asking a perhaps foolish question . . .
>What the hell is this!?!

It's a paper tape image.  I'm not sure what the text says, though.
I think the first letter is ``I,'' though.

	- Dan C.

Re: [9fans] sam mod for delete-forward

[Sam]

At the risk of asking a perhaps foolish question . . .
What the hell is this!?!

:),

sam
On Tuesday 27 March 2001 03:25, you wrote:
> Douglas A. Gwyn <gwyn@arl.army.mil> a crit dans le message :
> 3ABF5D54.B549A18B@arl.army.mil...
>
> > I appreciate the point.  It is a pity that the industry didn't agree on
> > standard uses for control keystrokes.  Actually DEL is RUBOUT, which
> > should be ignored since it is where the punched paper tape was
> > backspaced and overpunched to remove an erroneous character.  ESC is
> > supposed to introduce a *sequence* of characters.
> >
> |-------------|
> | o o .     o |
> |     . o   o |
> |   o . o     |
> |   o .     o |
> | o   .       |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o   . o   o |
> |     .   o o |
> | o o . o     |
> | o o .   o o |
> | o o .   o   |
> | o o . o o o |
> |   o .   o   |
> | o   .       |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o o .       |
> |     .     o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> |   o . o     |
> |     .     o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o o .     o |
> |     . o   o |
> | o   . o   o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> |     . o o   |
> |     .   o o |
> |     .     o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o o .       |
> | o   .   o   |
> | o   .   o   |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o   .   o   |
> |     .   o o |
> | o   . o     |
> | o o . o o   |
> | o   .       |
> | o   . o   o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o   . o o   |
> | o o . o     |
> |     . o o   |
> |   o . o o   |
> |     .     o |
> |   o . o     |
> |     .   o o |
> |     . o o   |
> | o o .       |
> |   o .     o |
> |   o . o     |
> |     .     o |
> | o   . o   o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> |     .     o |
> |     .   o o |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> |     .     o |
> |     . o   o |
> | o   .       |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> |   o . o o   |
> |     .   o o |
> |     . o o o |
> |     . o o o |
> | o o .       |
> |     . o o   |
> | o   .   o   |
> | o o .   o o |
> |     . o     |
> | o o . o o o |
> | o o .     o |
> |   o . o     |
> |     . o o   |
> | o   .   o   |
> |     .   o o |
> | o o .     o |
> | o o .   o o |
> | o   .   o o |
> |   o .       |
> |-------------|

-- 


Sam Hopkins
------------------------------------------------
Random QOTD:
"It now costs more to amuse a child,
	than it once did to educate his father."

Re: [9fans] sam mod for delete-forward

[Boyd Roberts]

Douglas A. Gwyn <gwyn@arl.army.mil> a crit dans le message :
3ABF5D54.B549A18B@arl.army.mil...
> I appreciate the point.  It is a pity that the industry didn't agree on
> standard uses for control keystrokes.  Actually DEL is RUBOUT, which
> should be ignored since it is where the punched paper tape was
> backspaced and overpunched to remove an erroneous character.  ESC is
> supposed to introduce a *sequence* of characters.

|-------------|
| o o .     o |
|     . o   o |
|   o . o     |
|   o .     o |
| o   .       |
| o o .   o o |
|     . o     |
| o o . o o o |
| o   . o   o |
|     .   o o |
| o o . o     |
| o o .   o o |
| o o .   o   |
| o o . o o o |
|   o .   o   |
| o   .       |
| o o .   o o |
|     . o     |
| o o . o o o |
| o o .       |
|     .     o |
| o o .   o o |
|     . o     |
| o o . o o o |
|   o . o     |
|     .     o |
| o o .   o o |
|     . o     |
| o o . o o o |
| o o .     o |
|     . o   o |
| o   . o   o |
| o o .   o o |
|     . o     |
| o o . o o o |
|     . o o   |
|     .   o o |
|     .     o |
| o o .   o o |
|     . o     |
| o o . o o o |
| o o .       |
| o   .   o   |
| o   .   o   |
| o o .   o o |
|     . o     |
| o o . o o o |
| o   .   o   |
|     .   o o |
| o   . o     |
| o o . o o   |
| o   .       |
| o   . o   o |
| o o .   o o |
|     . o     |
| o o . o o o |
| o   . o o   |
| o o . o     |
|     . o o   |
|   o . o o   |
|     .     o |
|   o . o     |
|     .   o o |
|     . o o   |
| o o .       |
|   o .     o |
|   o . o     |
|     .     o |
| o   . o   o |
| o o .   o o |
|     . o     |
| o o . o o o |
|     .     o |
|     .   o o |
| o o .   o o |
|     . o     |
| o o . o o o |
|     .     o |
|     . o   o |
| o   .       |
| o o .   o o |
|     . o     |
| o o . o o o |
|   o . o o   |
|     .   o o |
|     . o o o |
|     . o o o |
| o o .       |
|     . o o   |
| o   .   o   |
| o o .   o o |
|     . o     |
| o o . o o o |
| o o .     o |
|   o . o     |
|     . o o   |
| o   .   o   |
|     .   o o |
| o o .     o |
| o o .   o o |
| o   .   o o |
|   o .       |
|-------------|

Re: [9fans] sam mod for delete-forward

[Scott Schwartz]

| I'm nervous about this because rio can't do the same thing, and if you
| get in the habit in sam place you'll be sorry in rio when you kill the
| process.  I regret the different interpretations of ESC and don't want
| to make another mistake like that.

Does rio really need to use the delete key for that?  Most keyboards
these days have some spare function keys, if not a key that's actually
labled something like "Break".

Re: [9fans] sam mod for delete-forward

[Douglas A. Gwyn]

rob pike wrote:
> I'm nervous about this because rio can't do the same thing, and if you
> get in the habit in sam place you'll be sorry in rio when you kill the
> process.  I regret the different interpretations of ESC and don't want
> to make another mistake like that.

I appreciate the point.  It is a pity that the industry didn't agree on
standard uses for control keystrokes.  Actually DEL is RUBOUT, which
should be ignored since it is where the punched paper tape was
backspaced and overpunched to remove an erroneous character.  ESC is
supposed to introduce a *sequence* of characters.  Etc.  I'm not sure
why the early Unix use of DEL to generate an INTR signal was carried
into Plan 9, but frankly it seems like a poor choice.  ETX (^C) is a
semi-standard for this function, just as DEL deletes
forward in most text processors these days.

I doubt you want to go the X11-init-file route, but it might be
useful to employ *some* sort of functional key map, defaulting to
whatever you think is best.  Then sam, rio, and other apps could be
uniformly coded to test for the key corresponding to the function
Delete-Word-Backward, Delete-Char-Forward, Generate-Signal, etc.
instead of hard-wiring the functions.  I know that hard-wired
functions make it easier to use somebody else's environment, but I
don't think that trumps the desire to be able to switch among Plan 9
and other OSes without having to retrain one's fingers.

I just realized that while preparing this message under Solaris with
Netscape's Compose window, I used DEL for delete-forward several times.

Re: [9fans] sam mod for delete-forward

[rob pike]

I'm nervous about this because rio can't do the same thing, and if you
get in the habit in sam place you'll be sorry in rio when you kill the
process.  I regret the different interpretations of ESC and don't want
to make another mistake like that.

-rob