76 lines
2.3 KiB
Scheme
76 lines
2.3 KiB
Scheme
;;; Syntax definitions for scsh.
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;;; Translating process forms into Scheme code.
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;;; Copyright (c) 1993 by Olin Shivers.
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(define-syntax define-simple-syntax
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(syntax-rules ()
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((define-simple-syntax (name . pattern) result)
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(define-syntax name (syntax-rules () ((name . pattern) result))))))
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;;; The three basic forms for running an extended process form:
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;;; EXEC-EPF, &, and RUN. EXEC-EPF is the foundation.
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;; This is used by the macro for the << redirection to prevent the temporary
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;; port from being closed by a GC before the process exec's
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(define <<-port-holder)
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(define-syntax exec-epf
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(lambda (form rename compare)
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(transcribe-extended-process-form (cdr form) rename compare)))
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(define-simple-syntax (& . epf)
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(fork (lambda () (exec-epf . epf))))
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(define-simple-syntax (run . epf)
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(wait (& . epf)))
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;;; Sequencing operators:
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;;;
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;;; (|| pf1 ... pfn)
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;;; Run each proc until one completes successfully (i.e., exit status 0).
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;;; Return true if some proc completes successfully; otherwise #f.
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;;;
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;;; (&& pf1 ... pfn)
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;;; Run each proc until one fails (i.e., exit status non-0).
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;;; Return true if all procs complete successfully; otherwise #f.
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;;; WARNING: || is not a readable symbol in R4RS.
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(define-simple-syntax (|| pf ...) (or (zero? (run pf)) ...))
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(define-simple-syntax (:or: pf ...) (or (zero? (run pf)) ...))
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(define-simple-syntax (&& pf ...) (and (zero? (run pf)) ...))
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(define-simple-syntax (run/collecting fds . epf)
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(run/collecting* `fds (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/port+proc . epf)
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(run/port+proc* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/port . epf)
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(run/port* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/strings . epf)
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(run/strings* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/file . epf)
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(run/file* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/string . epf)
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(run/string* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/sexp . epf)
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(run/sexp* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/sexps . epf)
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(run/sexps* (lambda () (exec-epf . epf))))
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(define-simple-syntax (run/pty . epf)
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(run/pty* (lambda () (exec-epf . epf))))
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;(define (expand-mac transformer form)
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; (transformer form (lambda (x) x) eq?))
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;(define-simple-syntax (test-mac trans . form)
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; (pp (expand-mac trans (quote form))))
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