On Wed, Feb 25, 2009 at 09:48:08PM +0000, Nicolas Cellier wrote:
> Marcus Denker <den...@...> writes:
>
> > On 25.02.2009, at 22:27, Matthew Fulmer wrote:
> >
> > >>
> > >> Each command will then be a message sent to the object referenced by
> > >> the variable 'shell'.
> > >>
> > >> entering 'ls' will then invoke 'shell.ls'...
> >
> > I would say that a command like "ls" is not a method. It's an object
> > (instance of a sublass of "Script" or "Command").
> >
> > You want, for example, inherit things like command line parsing,
> > standard options
> > (e.g. --help) and things liket that. A command like ls is far too
> > complex to be
> > just one method.
>
> I would say ls is a message, and Shell ls answer with a LSCommand which is
> kindOf: Command.
> A Command use lazy evaluation: it does not evaluate until a end of line or
> pipe
> message triggers evaluation (i mean send the message #value).
>
> Before being evaluated, Command behaviour can be modified by sending all sort
> of
> message, like -l --help etc...
> Of course, apart options which are messages sent to the command (eventually
> with
> arguments), a list of arguments can be passed to the Command itself (Command
> valueWithArguments: aList).
>
> Just have to invent the syntax now...
You may be interested in ExternalCommandShell which is part of the CommandShell
package (SqueakMap, SqueakSource, etc). This lets you use Squeak as a command
line shell replacing /bin/sh, and uses pipes to connect Smalltalk expressions,
command objects, and external OS programs.
http://wiki.squeak.org/squeak/6023
http://wiki.squeak.org/squeak/2153
http://wiki.squeak.org/squeak/1914
The syntax is a mashup of Smalltalk and unix shell conventions. The pipes are
OS pipes where necessary to interact with external programs, or an object
that minics OS pipe behavior if the "commands" being connected are Smalltalk
expressions or command objects.
For example, if you enter "help | cat" at the command prompt, you will get
a Smalltalk command object that evaluates "help" and writes its output to
a Unix pipe connected to an OS process running the /bin/cat command, which
reads the output of the "help" command, and copies it to the shell output:
sqsh> help | cat
cd [path] - change default directory
help - help on sqsh commands
history - display command history list
pwd - print current working directory
sls [filepatterns] - list current directory contents
snapshot - save the Squeak image
exit - exit shell and quit Squeak without saving image
type [names...] - indicate how each name would be interpreted if used as a
command
simple Smalltalk expression! evaluates a simple expression as a doIt
<ctl-C> to interrupt a running program
<ctl-D> to end input to a running program
sqsh>
Dave
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