* function to replace the command line text
@ 2014-04-18 19:49 Dave Yost
2014-04-18 21:55 ` Frank Terbeck
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Dave Yost @ 2014-04-18 19:49 UTC (permalink / raw)
To: zsh-workers
Is there a builtin function that replaces the command line with the function's output? The completion mechanism must use such a function, so there has to be something like that.
I want to use that function to build a function I can use to run a demo consisting of a sequence of commands.
* Make an array of strings
* For each step of the demo
* Type a command or a keyboard shortcut that grabs the next string from the array and places it on the command line
* Hit Enter to execute the command
Thanks
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: function to replace the command line text
2014-04-18 19:49 function to replace the command line text Dave Yost
@ 2014-04-18 21:55 ` Frank Terbeck
2014-04-19 3:27 ` Bart Schaefer
2014-04-24 20:34 ` zsh script to run prepared shell commands for a demo Dave Yost
2 siblings, 0 replies; 4+ messages in thread
From: Frank Terbeck @ 2014-04-18 21:55 UTC (permalink / raw)
To: Dave Yost; +Cc: zsh-workers
Dave Yost wrote:
> Is there a builtin function that replaces the command line with the
> function's output? The completion mechanism must use such a function,
> so there has to be something like that.
>
> I want to use that function to build a function I can use to run a
> demo consisting of a sequence of commands.
>
> * Make an array of strings
> * For each step of the demo
> * Type a command or a keyboard shortcut that grabs the next string
> from the array and places it on the command line
> * Hit Enter to execute the command
Here's an outline:
zsh% foo=( FOO BAR BAZ QUUZ )
zsh% j=1
zsh% FOO() { BUFFER=${foo[j++]}; CURSOR=${#BUFFER} }
zsh% zle -N FOO
zsh% bindkey '^L' FOO
Then press Ctrl-L to get (_ is the cursor position):
zsh% FOO_
Then Ctrl-L again for:
zsh% BAR_
etc... You get the idea.
Regards, Frank
--
In protocol design, perfection has been reached not when there is
nothing left to add, but when there is nothing left to take away.
-- RFC 1925
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: function to replace the command line text
2014-04-18 19:49 function to replace the command line text Dave Yost
2014-04-18 21:55 ` Frank Terbeck
@ 2014-04-19 3:27 ` Bart Schaefer
2014-04-24 20:34 ` zsh script to run prepared shell commands for a demo Dave Yost
2 siblings, 0 replies; 4+ messages in thread
From: Bart Schaefer @ 2014-04-19 3:27 UTC (permalink / raw)
To: Dave Yost, zsh-workers
On Apr 18, 12:49pm, Dave Yost wrote:
}
} Is there a builtin function that replaces the command line with the
} function's output?
As Frank demonstrated, the most basic "function" for this is to assign
to the special parameter $BUFFER from inside a user-defined ZLE widget.
However ...
} I want to use that function to build a function I can use to run a
} demo consisting of a sequence of commands.
} * Make an array of strings
} * For each step of the demo
} * Type a command or a keyboard shortcut that grabs the next string
} from the array and places it on the command line
} * Hit Enter to execute the command
There are a bunch of ways to do this. If you just want to execute the
commands one after another, you could:
- Store the commands in a file, one per line;
- Load the file as history with "fc -R" or "fc -p";
- bindkey ^M accept-and-infer-next-history;
- scroll back (up-history) to the first command;
- each subseqent enter executes the command and advances to the next.
This has the advantage that you can up-history to redo any command. If
that isn't likely to be necessary you can:
- push the commands onto the buffer stack, in reverse order, with
one "print -z" per command;
- press enter to load the first command;
- each subseqent enter executes the command and pops the next.
Here you'd have to use the push-line widget and then up-history if you
want to redo a command.
If you want to be able to go off-script to execute some other commands
and then resume the demo, then you'll need something like what Frank
outlined, with a key binding to produce the next step when ready. If
you hit the "next step" key more than once, though, you'll skip over
a command step and have no way to get back to it, unless you also
create another binding that steps down through the array.
Here's a variation of Frank's FOO widget that lets you select which
step of the demo you want, and by default goes on to the next:
FOO() {
if (( NUMERIC > 0 ))
then (( j=NUMERIC ))
elif (( NUMERIC < 0 ))
then (( NUMERIC > -j ? (j+=NUMERIC) : (j=1) ))
fi
BUFFER=${foo[j++]}; CURSOR=${#BUFFER}
}
You press ESC 2 ^L, for example, to select the second step, or to go
backward, ESC - ESC 1 ^L (repeats the last step).
^ permalink raw reply [flat|nested] 4+ messages in thread
* zsh script to run prepared shell commands for a demo
2014-04-18 19:49 function to replace the command line text Dave Yost
2014-04-18 21:55 ` Frank Terbeck
2014-04-19 3:27 ` Bart Schaefer
@ 2014-04-24 20:34 ` Dave Yost
2 siblings, 0 replies; 4+ messages in thread
From: Dave Yost @ 2014-04-24 20:34 UTC (permalink / raw)
To: zsh-workers
With the kind help of Bart Schaefer and Frank Terbeck, I think this is pretty much done.
See http://yost.com/computers/demo-shell-commands/demo-shell-commands.zsh
On Fri 2014-04-18, at 12:49 PM, Dave Yost <Dave@Yost.com> wrote:
> Is there a builtin function that replaces the command line with the function's output? The completion mechanism must use such a function, so there has to be something like that.
>
> I want to use that function to build a function I can use to run a demo consisting of a sequence of commands.
> * Make an array of strings
> * For each step of the demo
> * Type a command or a keyboard shortcut that grabs the next string from the array and places it on the command line
> * Hit Enter to execute the command
>
> Thanks
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-04-24 20:35 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2014-04-18 19:49 function to replace the command line text Dave Yost
2014-04-18 21:55 ` Frank Terbeck
2014-04-19 3:27 ` Bart Schaefer
2014-04-24 20:34 ` zsh script to run prepared shell commands for a demo Dave Yost
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