[9fans] Practical issue on using rc shell

[9fans] Practical issue on using rc shell

[Maurí­cio CA]

Hi,

I'm new to plan9 from user space. I've started using rc shell for
scripts and, for daily use, I would like to solve a problem.

I see that rc isn't built with readline or similar. So, do you use
some alternative? Or do you think I can live without it?

Thanks,
Maur�cio

Re: [9fans] Practical issue on using rc shell

[erik quanstrom]

what i find i can't live without is a record
of the commands i've typed.  sometimes a
one-liner from last week is useful.  i use the
commands - and -- (source: /n/sources/contrib/quanstro/src/history.c)
along with the following patch to rc to make it
go.

- erik

; 9diff fns.h
/n/sources/plan9//sys/src/cmd/rc/fns.h:61,66 - fns.h:61,67
  void	start(code*, int, var*);
  int	truestatus(void);
  void	usage(char*);
+ void whistory(tree*);
  int	wordchr(int);
  void	yyerror(char*);
  int	yylex(void);
; 9diff *.y
post...
/n/sources/plan9//sys/src/cmd/rc/syn.y:12,17 - syn.y:12,28
  %{
  #include "rc.h"
  #include "fns.h"
+
+ int
+ hcompile(tree *t)
+ {
+ 	int i;
+
+ 	if(i = compile(t))
+ 		whistory(t);
+ 	return !i;
+ }
+
  %}
  %union{
  	struct tree *tree;
/n/sources/plan9//sys/src/cmd/rc/syn.y:22,28 - syn.y:33,39
  %type<tree> WORD REDIR DUP PIPE
  %%
  rc:				{ return 1;}
- |	line '\n'		{return !compile($1);}
+ |	line '\n'			{ return hcompile($1); }
  line:	cmd
  |	cmdsa line		{$$=tree2(';', $1, $2);}
  body:	cmd
; cat history.c
#include "rc.h"
#include "exec.h"
#include "fns.h"
#include "io.h"

void
whistory(tree *t){
	char* s;
	int fd, flags;
	io* o;
	var* v;

	if(!runq->iflag || !t)
		return;
	v = vlook("history");
	if(!v->val || count(v->val) != 1)
		return;
	if(v->fn)
		return;	/* fn history {echo $*>>$history_file} ? */

	s = v->val->word;
	flags = OWRITE;
	if((fd=open(s, flags))<0 && (fd=create(s, flags, DMAPPEND|0666L))<0){
		/* setvar("history", 0); */
		return;
	}

	o = openfd(fd);
	seek(fd, 0, 2);
	pfmt(o, "%t\n", t);
	closeio(o);
}

Re: [9fans] Practical issue on using rc shell

[Tim Newsham]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 630 bytes --]

> Hi,
>
> I'm new to plan9 from user space. I've started using rc shell for
> scripts and, for daily use, I would like to solve a problem.
>
> I see that rc isn't built with readline or similar. So, do you use
> some alternative? Or do you think I can live without it?

For scripting it shouldn't be an issue. For interactive use
it can be a pain if you are using a normal terminal environment.
In plan9 you'd usually run rc in a rio window or in acme where
the environment lets you edit and reuse commands from the scrollback.

> Thanks,
> Maurício

Tim Newsham | www.thenewsh.com/~newsham | thenewsh.blogspot.com

Re: [9fans] Practical issue on using rc shell

[David Leimbach]

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On Fri, Nov 13, 2009 at 10:54 AM, Tim Newsham <newsham@lava.net> wrote:

> Hi,
>>
>> I'm new to plan9 from user space. I've started using rc shell for
>> scripts and, for daily use, I would like to solve a problem.
>>
>> I see that rc isn't built with readline or similar. So, do you use
>> some alternative? Or do you think I can live without it?
>>
>
> For scripting it shouldn't be an issue. For interactive use
> it can be a pain if you are using a normal terminal environment.
> In plan9 you'd usually run rc in a rio window or in acme where
> the environment lets you edit and reuse commands from the scrollback.
>
>
If you've already got plan9 from user space, try using rc with 9term, or
inside an Acme "win" session.

Plan 9 is very mouse driven and you should use a terminal window that lets
you take advantage of that interactivity.

Dave



>  Thanks,
>> Maurício
>>
>
> Tim Newsham | www.thenewsh.com/~newsham | thenewsh.blogspot.com

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Re: [9fans] Practical issue on using rc shell

[pmarin]

Fortu

On Fri, Nov 13, 2009 at 8:02 PM, David Leimbach <leimy2k@gmail.com> wrote:
>
>
> On Fri, Nov 13, 2009 at 10:54 AM, Tim Newsham <newsham@lava.net> wrote:
>>>
>>> Hi,
>>>
>>> I'm new to plan9 from user space. I've started using rc shell for
>>> scripts and, for daily use, I would like to solve a problem.
>>>
>>> I see that rc isn't built with readline or similar. So, do you use
>>> some alternative? Or do you think I can live without it?
>>
>> For scripting it shouldn't be an issue. For interactive use
>> it can be a pain if you are using a normal terminal environment.
>> In plan9 you'd usually run rc in a rio window or in acme where
>> the environment lets you edit and reuse commands from the scrollback.
>>
>
> If you've already got plan9 from user space, try using rc with 9term, or
> inside an Acme "win" session.
> Plan 9 is very mouse driven and you should use a terminal window that lets
> you take advantage of that interactivity.
> Dave
>
>>>
>>> Thanks,
>>> Maurício
>>
>> Tim Newsham | www.thenewsh.com/~newsham | thenewsh.blogspot.com
>

fortunately, the unix world is less radical, you can use rlfe
http://per.bothner.com/software/

pmarin

Re: [9fans] Practical issue on using rc shell

[Venkatesh Srinivas]

The other (Byron Rakitzis) unix port of rc can be linked against
either readline or editline.

-- vs

Re: [9fans] Practical issue on using rc shell

[Roman Shaposhnik]

On Fri, Nov 13, 2009 at 12:46 PM, pmarin <pacogeek@gmail.com> wrote:
> fortunately, the unix world is less radical, you can use rlfe
> http://per.bothner.com/software/

There's also versatile socat:
    http://www.dest-unreach.org/socat/doc/socat.html#EXAMPLE_ADDRESS_READLINE

Thanks,
Roman.

Re: [9fans] Practical issue on using rc shell

[Nick LaForge]

On Fri, Nov 13, 2009 at 12:46 PM, pmarin <pacogeek@gmail.com> wrote:
> Fortu
>
> fortunately, the unix world is less radical, you can use rlfe
> http://per.bothner.com/software/
>
> pmarin

fortunately, plan9 includes a c compiler

Nick

Re: [9fans] Practical issue on using rc shell

[pmarin]

fortunately,  in unix you can run go :).


On Fri, Nov 13, 2009 at 10:00 PM, Nick LaForge <nicklaforge@gmail.com> wrote:
> On Fri, Nov 13, 2009 at 12:46 PM, pmarin <pacogeek@gmail.com> wrote:
>> Fortu
>>
>> fortunately, the unix world is less radical, you can use rlfe
>> http://per.bothner.com/software/
>>
>> pmarin
>
> fortunately, plan9 includes a c compiler
>
> Nick
>
>