Lamu REPL Processor

Design Goal

Lamu REPL should be able to interact directly with humans and also be able to work with standard-input/output in order to automate the controlling of Lamu’s control-flow.

Overview

The commands and other data are passed from the standard-input as text-data.
The data is processed line-wise. The processor has a buffer to store the text-data. A line which is prefixed with specific characters is treated as a command-line; otherwise the line is accumulated in the buffer.

The default command-line prefix is ;lamu:. This can be changed by a command which is described later.

The command-line can take an argument. The command and the argument are separated by blank characters. The string literal after the blank characters is treated as an argument.

Available Commands

• hello
• alive?
• prefix
• ?
• help
• bye
• quit
• load
• save
• delete
• echo
• exec
• list
• clear
• show
• error

hello

Returns a simple greeting. This command has no effect to the current state.

;lamu:hello

alive?

This always returns #t unless the application is malfunctioning.

prefix

Change the command-line prefix.

;lamu:prefix ;lambda-music:

After executing above, you can execute a command by the following.

;lambda-music:hello

help

Returns a list of available command names.

?

Same as help

bye

End the program.

quit

End the program.

show

Returns the content of the buffer.

clear

Clear the buffer.

exec

Executes the content of the buffer. After executing this command, the buffer will be cleared.

save

Save the content of the buffer to the specified buffer-storage. After executing this command, the buffer will be cleared.

load

Load data from the specified buffer-storage and set it to the buffer.

delete

Delete the specified buffer-storage.

echo

Output the content of the buffer. After executing this command, the buffer will be cleared.

list

Output the list of the available buffer-storages.

error

Returns an error message with the specified reason.