variable containing the current command

variable containing the current command

[benjamin]

Is there a zsh environment variable that contains the current command
so that it can be referenced in preexec() or precmd() (or ideally both)?

e.g.

precmd() { echo "Just did:$CURRENT_CMD" }
preexec() { echo "Ready to do:$CURRENT_CMD" }

localhost[1]% ls
Ready to do:ls
foo		bar		snafu		tarfu
Just did:ls
localhost[2]%

Ben
-- 
Benjamin Korvemaker
benjamin@cs.ualberta.ca
	I have yet to meet a C compiler that is more friendly
	   and easier to use than eating soup with a knife.

Re: variable containing the current command

[Sweth Chandramouli]

On Wed, May 26, 1999 at 02:23:10PM -0600, benjamin@cs.ualberta.ca wrote:
> Is there a zsh environment variable that contains the current command
> so that it can be referenced in preexec() or precmd() (or ideally both)?
> 
> e.g.
> 
> precmd() { echo "Just did:$CURRENT_CMD" }
> preexec() { echo "Ready to do:$CURRENT_CMD" }
> 
> localhost[1]% ls
> Ready to do:ls
> foo		bar		snafu		tarfu
> Just did:ls
> localhost[2]%
	$_ is almost what you are looking for; it is supposed to be set for
any command to the full name of that command.  if you use it as you use 
CURRENT_CMD above, however, you get something like this:

(astaroth/1)~: precmd() { echo "Just did:$_" }
Just did:precmd
(astaroth/2)~: preexec() { echo "Ready to do:$_" }
Just did:preexec
(astaroth/3)~: ls
Ready to do:preexec
appconfig    Mail         News         public_html  working
bin          mail         news         src          www
docs         misc         nohup.out    tmp
Just did:ls
(astaroth/4)~: 

	i could never figure out why it acts that way, though, so i've
never really used it.

	-- sweth.

-- 
Sweth Chandramouli
IS Coordinator, The George Washington University
<sweth@gwu.edu> / (202) 994 - 8521 (V) / (202) 994 - 0458 (F)
<a href="http://astaroth.nit.gwu.edu/~sweth/disc.html">*</a>

Re: variable containing the current command

[Bart Schaefer]

On May 26,  2:23pm, benjamin@cs.ualberta.ca wrote:
> Subject: variable containing the current command
> Is there a zsh environment variable that contains the current command
> so that it can be referenced in preexec() or precmd() (or ideally both)?

In preexec, the positional parameter $1 holds the entire command line just
as it was read from the terminal (after history expansion but before any
other expansions/substitutions).

You could have preexec copy this to a global parameter where precmd can
see it later.

On May 26,  5:40pm, Sweth Chandramouli wrote:
> Subject: Re: variable containing the current command
> 	$_ is almost what you are looking for; it is supposed to be set for
> any command to the full name of that command.

That's not quite correct.  From the doc:

`_'
     The last argument of the previous command.  Also, this parameter
     is set in the environment of every command executed to the full
     pathname of the command.

So it's only during the execution of a command that you can find the path
of that command in $_.  Once you're back in the shell (as during precmd),
you get the last word of the previous command line (not the first; try
your "ls" example with some file name arguments to "ls").

As for this:

> (astaroth/3)~: ls
> Ready to do:preexec

I suspect it has something to do with how or when preexec is executed.
PWS could tell us more, but he's out for a few days.

Re: variable containing the current command

[Michael Barnes]

here is my preexec

~ which preexec
preexec () {
	word=$* 
	word=$word[(w)0] 
	case $word in
		cd*|ls*)  ;;
		*) print -Pn "\e]2;%n@%m $word \a" ;;
	esac
}

for some reason $1 does not get set properly under 3.0.5 extended so I
manually parse it out from $*, dunno about newer versions.

Mike

On Wed, May 26, 1999 at 10:17:41PM +0000, Bart Schaefer wrote:
> On May 26,  2:23pm, benjamin@cs.ualberta.ca wrote:
> > Subject: variable containing the current command
> > Is there a zsh environment variable that contains the current command
> > so that it can be referenced in preexec() or precmd() (or ideally both)?
> 
> In preexec, the positional parameter $1 holds the entire command line just
> as it was read from the terminal (after history expansion but before any
> other expansions/substitutions).
> 
> You could have preexec copy this to a global parameter where precmd can
> see it later.
> 
> On May 26,  5:40pm, Sweth Chandramouli wrote:
> > Subject: Re: variable containing the current command
> > 	$_ is almost what you are looking for; it is supposed to be set for
> > any command to the full name of that command.
> 
> That's not quite correct.  From the doc:
> 
> `_'
>      The last argument of the previous command.  Also, this parameter
>      is set in the environment of every command executed to the full
>      pathname of the command.
> 
> So it's only during the execution of a command that you can find the path
> of that command in $_.  Once you're back in the shell (as during precmd),
> you get the last word of the previous command line (not the first; try
> your "ls" example with some file name arguments to "ls").
> 
> As for this:
> 
> > (astaroth/3)~: ls
> > Ready to do:preexec
> 
> I suspect it has something to do with how or when preexec is executed.
> PWS could tell us more, but he's out for a few days.

Re: variable containing the current command

[Bart Schaefer]

On May 26,  6:50pm, Michael Barnes wrote:
} Subject: Re: variable containing the current command
}
} preexec () {
} 	word=$* 
} 	word=$word[(w)0] 
} 	case $word in
} 		cd*|ls*)  ;;
} 		*) print -Pn "\e]2;%n@%m $word \a" ;;
} 	esac
} }
} 
} for some reason $1 does not get set properly under 3.0.5 extended so I
} manually parse it out from $*, dunno about newer versions.

I'm not sure why you say $1 does not get set properly.  $1 gets set to
the entire command line, which is exactly how it's documented:

`preexec'
     Executed just after a command has been read and is about to be
     executed.  If the history mechanism is active, the string to be
     executed is passed as an argument.             ^^^^!!!!!!^^^^^^
     ^^^^^^^^^^^^^^^^^^^^^^!!^^^^^^^^^

Is that in fact what you see, or is there a bug that I can't reproduce?

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Re: variable containing the current command

[benjamin]

Thanks. That's EXACTLY what I was looking for. Reading the man page
carefully reveals that I am too stupid to live. :)

Ben

Bart Schaefer said:
> On May 26,  2:23pm, benjamin@cs.ualberta.ca wrote:
> > Subject: variable containing the current command
> > Is there a zsh environment variable that contains the current command
> > so that it can be referenced in preexec() or precmd() (or ideally both)?
> 
> In preexec, the positional parameter $1 holds the entire command line just
> as it was read from the terminal (after history expansion but before any
> other expansions/substitutions).
> 
> You could have preexec copy this to a global parameter where precmd can
> see it later.
> 
> On May 26,  5:40pm, Sweth Chandramouli wrote:
> > Subject: Re: variable containing the current command
> > 	$_ is almost what you are looking for; it is supposed to be set for
> > any command to the full name of that command.
> 
> That's not quite correct.  From the doc:
> 
> `_'
>      The last argument of the previous command.  Also, this parameter
>      is set in the environment of every command executed to the full
>      pathname of the command.
> 
> So it's only during the execution of a command that you can find the path
> of that command in $_.  Once you're back in the shell (as during precmd),
> you get the last word of the previous command line (not the first; try
> your "ls" example with some file name arguments to "ls").
> 
> As for this:
> 
> > (astaroth/3)~: ls
> > Ready to do:preexec
> 
> I suspect it has something to do with how or when preexec is executed.
> PWS could tell us more, but he's out for a few days.
> 


-- 
Benjamin Korvemaker
benjamin@cs.ualberta.ca
     The programmer's national anthem is 'AAAAAAAARRRRGHHHHH!!'.