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Article contents:== live-define [[toc:]] Hack to simplify some cases of interactive development. === Requirements * matchable === Documentation <macro> (define name (lambda arguments body ...))</macro> <macro> (define (name arguments) body ...)</macro> A macro that replaces the standard Scheme {{define}} with one that, when it detects that a procedure is bound to {{name}}, mutates that procedure in place instead of binding the name to a new procedure. This is useful in situations where you pass the procedure {{name}} as an argument to another and want to change it’s behavior while the program is running. For example by using your text editor’s facility to send code to a running instance of csi. '''Please note that this is only intented to be used within the interpreter and will probably break in various ways if used in compiled code''' === Examples This is a pretty contrived example, but it shows the modified behavior quite well. Run it with {{csi -s example.scm}} <enscript highlight="scheme"> (import srfi-18) ;; try commenting this next line to see the standard behavior (import live-define) (define (thread-proc thunk) (lambda () (let lp () (thread-sleep! 1) (thunk) (lp)))) (define (the-thunk) (print "hi!")) (thread-start! (thread-proc the-thunk)) ;; -> prints "hi!" every second (thread-sleep! 5) (define (the-thunk) (print "coucou !")) ;; -> thread now prints "coucou !" every second (thread-sleep! 5) </enscript> === Version History ==== Version 1.1 30 November 2018 * Fix a bug that prevented the redefinition of a symbol imported from a module ==== Version 1.0 30 November 2018 * Original release === Source repository Source available in [[https://www.upyum.com/cgit.cgi/live-define/|a git repository]] Bug reports and patches welcome! Bugs can be reported to kooda@upyum.com === Authors Adrien (Kooda) Ramos === License Public Domain Description of your changes:

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