84 lines
2.8 KiB
Scheme
84 lines
2.8 KiB
Scheme
;;; Scsh start-up code.
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;;; Copyright (c) 1995 by Olin Shivers.
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;;; A scsh starter takes the command line args, parses them,
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;;; initialises the scsh system, and either starts up a repl loop
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;;; or executes the -s script.
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(define (make-scsh-starter)
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(let ((context (user-context)))
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(lambda (args)
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(parse-switches-and-execute args context))))
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;;; Had to define these as the ones in s48's build.scm do not properly
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;;; initialise ERROR-OUTPUT-PORT to stderr -- this is a bug in the vm's
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;;; handoff to the very first Scheme form (it passes two ports -- not three).
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;;; Until Kelsey fixes these, we hack it with these replacements, which
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;;; invoke INIT-SCSH-HINDBRAIN, which re-initialises the I/O system to be
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;;; what you wanted.
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;;; WRITE-IMAGE calls the starter after installing a fatal top-level
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;;; error handler. MAKE-SCSH-STARTER shadows it in the interactive case.
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(define (really-dump-scsh-program start filename)
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(let ((filename (translate filename)))
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(display (string-append "Writing " filename) (command-output))
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(newline (command-output))
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;JMG: it is set to #f in the vm, so I omit it now
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;;;(flush-the-symbol-table!) ;Gets restored at next use of string->symbol
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(write-image filename
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(scsh-stand-alone-resumer start)
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"Scsh 0.6")
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#t))
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;;; This one relies on the scsh top-level command-line switch parser
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;;; to decide whether to do the scsh-var inits quietly or with warnings.
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(define (dump-scsh fname)
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(really-dump-scsh-program (make-scsh-starter) fname))
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;;; Init the scsh run-time's vars quietly before running the program.
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;;; This is what we export to the user for his programs.
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(define (dump-scsh-program start filename)
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(let ((context (user-context)))
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(really-dump-scsh-program (lambda (args)
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(with-scsh-sighandlers
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#f
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(lambda ()
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(with-autoreaping
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(lambda ()
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(install-env)
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(initialize-cwd)
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(init-scsh-vars #f) ; Do it quietly.
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(start-new-session context
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(current-input-port)
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(current-output-port)
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(current-error-port)
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args
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#f)
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(with-interaction-environment
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(user-environment)
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(lambda ()
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(start args))))))))
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filename)))
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(define (scsh-stand-alone-resumer start)
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(usual-resumer ;sets up exceptions, interrupts, and current input & output
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(lambda (args) ; VM gives us our args, but not our program.
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(init-fdports!)
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(call-with-current-continuation
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(lambda (halt)
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(set! %vm-prog-args (cons "scsh" args)) ; WRONG -- use image.
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(set-command-line-args! %vm-prog-args)
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(with-handler
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(simple-condition-handler halt (current-error-port))
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(lambda ()
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(let ((exit-val (start (command-line))))
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(if (integer? exit-val) exit-val 0))))))))) ; work around bug.
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(define %vm-prog-args #f)
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