SCM

5.10: Line Editing

These procedures provide input line editing and recall.

These functions are defined in `edline.c' and `Iedline.scm' using the editline or GNU readline (see Top) libraries available from:

• ftp.sys.toronto.edu:/pub/rc/editline.shar
• prep.ai.mit.edu:/pub/gnu/readline-2.0.tar.gz

When `Iedline.scm' is loaded, if the current input port is the default input port and the environment variable EMACS is not defined, line-editing mode will be entered.

Function: default-input-port

Returns the initial current-input-port SCM was invoked with (stdin).

Function: default-output-port

Returns the initial current-output-port SCM was invoked with (stdout).

Function: make-edited-line-port

Returns an input/output port that allows command line editing and retrieval of history.

Function: line-editing

Returns the current edited line port or #f.

Function: line-editing bool

If bool is false, exits line-editing mode and returns the previous value of (line-editing). If bool is true, sets the current input and output ports to an edited line port and returns the previous value of (line-editing).