1. $0
2. $1
3. $2
4. $3
5. $4
6. $5
7. $6
8. $7
9. $8
10. $9
11. repl

A user-friendly REPL with line editing and signal handling. The default REPL provided by chibi-scheme is very minimal, meant primarily to be small and work on any platform. This module provides an advanced REPL that handles vt100 line editing and signal handling, so that C-c will interrupt a computation and bring you back to the REPL prompt. To use this repl, run

chibi-scheme -R

from the command line or within Emacs.Runs an interactive REPL. Repeatedly displays a prompt, then Reads an expression, Evaluates the expression, Prints the result then Loops. Terminates when the end of input is reached or the \exit command is given.

Basic Emacs-style line editing with persistent history completion is provided. C-c can be used to interrupt the current computation and drop back to the prompt. The following keyword arguments customize the REPL:

• in: - the input port (default (current-input-port))
• out: - the output port (default (current-output-port))
• module: - the initial module
• environment: - the initial environment (default (interaction-environment))
• escape: - the command escape character (default #\\)
• make-prompt: - a procedure taking one argument (the current module name as a list) and returning a string to be used as the prompt
• history: - the initial command history
• history-file: - the file to save history to (default ~/.chibi-repl-history)

The module: and environment: keyword arguments should not both be given.

REPL commands in the style of Scheme48 are available to control out-of-band properties. By default a command is written as an identifier beginning with an "@" character, but this can be customized with the escape: keyword. The following commands are available:

• \import <import-spec> - import the <import-spec> in the interaction-environment, useful if the import binding is not available
• \import-only <import-spec> - replace the interaction-environment with the given <import-spec>
• \in [<module>] - switch to <module>, or the interaction-environment if <module> is not specified
• \meta <expr> - evaluate <expr> in the (meta) module
• \meta-module-is <module> - switch the meta module to <module>
• \exit - exit the REPL

The results of the last ten successful evaluations are available via a history facility. $0 holds the most recent result while $9 holds the tenth-most recent result. Evaluations yielding single values are stored as single values while evaluations that yield multiple values are stored as lists of values.