Shell interface
Up: Kawa
Running commands
(run command arg ...)The
command is an executable program or script,
and the arg are command line arguments.
(For now leave it open if these evaluated or quoted.)
The result of standard output of the command is effectively redirected
to a temporary file, and the contents of this file, viewed
as a string or text object, becomes the result of the run
expression.
If the output consumer for the run is an
output port then the command's standard output is re-directed
to that port. In the initial case, the output consumer is the
standard output stream of the containing JVM, so no redirection is needed.
The standard error output of the command
is piped to the current error port. If the error port matches the
initial error port, no re-direction is needed.
The standard input of the command
is connected to the current input port of the dynamic context.
Discussion: An alternative is to define run
so the output from the comm and is written to the current output port.
One could then re-ify the output from a command with some kind of a
with-output-to-string macro.
File name expansion
(glob regexp)
Return a set of Path values that match the regexp,
as multiple values. The can be interpolated in a run
argument list.