Zsh Mailing List Archive
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Re: function to replace the command line text
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.
} 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:
if (( NUMERIC > 0 ))
then (( j=NUMERIC ))
elif (( NUMERIC < 0 ))
then (( NUMERIC > -j ? (j+=NUMERIC) : (j=1) ))
You press ESC 2 ^L, for example, to select the second step, or to go
backward, ESC - ESC 1 ^L (repeats the last step).
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