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Let­Settings­Kendal

cowan
2013-03-15 23:52:42
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SettingsListsCowan is nice, but would be even better with some syntax for using settings lists in one's own procedures, perhaps:

(let-settings (keywords settings-list) . body)

where keywords is a list of symbol names to extract from the settings-list, which will be bound to the named values in the current environment. The open-input-process procedures from ProcessPortsCowan might then be defined thus for the case where their filename argument is a list:

(define (open-[input|output|input/output]-process filename) (let-settings ((path arguments environment stdin-redirection stdout-redirection) filename) ... (execvp path arguments environment) ; or whatever ...))

(It could be written in terms of a call-with-settings procedure, of course.)