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Article contents:[[tags: manual]] [[toc:]] == Module (chicken csi) This module provides procedures to access features specific to the {{csi}} interactive interpreter. === toplevel-command <procedure>(toplevel-command SYMBOL PROC [HELPSTRING])</procedure> Defines or redefines a toplevel interpreter command which can be invoked by entering {{,SYMBOL}}. {{PROC}} will be invoked when the command is entered and may read any required argument via {{read}} (or {{read-line}}). If the optional argument {{HELPSTRING}} is given, it will be listed by the {{,?}} command. === set-describer! <procedure>(set-describer! TAG PROC)</procedure> Sets a custom description handler that invokes {{PROC}} when the {{,d}} command is invoked with a record-type object that has the type {{TAG}} (a symbol). {{PROC}} is called with two arguments: the object to be described and an output-port. It should write a possibly useful textual description of the object to the passed output-port. For example: #;1> (define-record-type point (make-point x y) point? (x point-x) (y point-y)) #;2> (set-describer! 'point (lambda (pt o) (with-output-to-port o (lambda () (print "a point with x=" (point-x pt) " and y=" (point-y pt)))))) #;3> ,d (make-point 1 2) a point with x=1 and y=2 === default-evaluator <procedure>(default-evaluator EXPR)</procedure> Takes {{EXPR}} and processes any of the built-in toplevel commands provided by {{csi}}. If {{EXPR}} is not a toplevel command, then it is evaluated using {{eval}}. This procedure is intended to be passed as an argument to {{repl}} to allow using {{csi}}s toplevel commands and history management in user-defined read-eval-print loops. === editor-command <parameter>editor-command</parameter> Holds the name of an editor that should be used when the toplevel command {{,e}} is used. --- Previous: [[Module (chicken continuation)]] Next: [[Module (chicken errno)]] Description of your changes:

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