313 lines
10 KiB
Scheme
313 lines
10 KiB
Scheme
;;; The scsh argv switch parser.
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;;; Copyright (c) 1995 by Olin Shivers.
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;;; Imports:
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;;; COMMAND-PROCESSOR: set-batch-mode?! command-loop
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;;; ENSURES-LOADED: really-ensure-loaded
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;;; ENVIRONMENTS: set-interaction-environment! environment-ref
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;;; environment-define!
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;;; ERROR-PACKAGE: error
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;;; EVALUATION: eval
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;;; EXTENDED-PORTS: make-string-input-port
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;;; INTERFACES: make-simple-interface
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;;; INTERRUPTS: interrupt-before-heap-overflow!
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;;; PACKAGE-COMMANDS-INTERNAL: user-environment config-package
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;;; get-reflective-tower
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;;; PACKAGE-MUTATION: package-open!
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;;; PACKAGES: structure-package structure? make-structure
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;;; make-simple-package
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;;; RECEIVING: mv return stuff
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;;; SCSH-LEVEL-0-INTERNALS: set-command-line-args!
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;;; SCSH-VERSION: scsh-version-string
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;;;
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;;; This should be defined by the package code, but it isn't.
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(define (get-struct config-pack struct-name)
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(let ((s (environment-ref config-pack struct-name)))
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(cond ((structure? s) s)
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(else (error "not a structure" s struct-name)))))
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;;; The switches:
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;;; -o <struct> Open the structure in current package.
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;;; -n <package> Create new package, make it current package.
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;;; -m <struct> <struct>'s package becomes current package.
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;;;
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;;; -l <file> Load <file> into current package.
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;;; -lm <file> Load <file> into config package.
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;;;
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;;; These two require terminating -s <script> arg:
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;;; -ds Load terminating script into current package.
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;;; -dm Load terminating script into config package.
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;;;
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;;; -e <entry> Call (<entry>) to start program.
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;;;
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;;; Terminating switches:
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;;; -c <exp> Eval <exp>, then exit.
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;;; -s <script> Specify <script> to be loaded by a -ds or -dm.
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;;; -s<num> Script is on file descriptor <num>.
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;;; -- Interactive scsh.
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;;; Return switch list, terminating switch, with arg, top-entry,
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;;; and command-line args.
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;;; - We first expand out any initial \ <filename> meta-arg.
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;;; - A switch-list elt is either "-ds", "-dm", or a (switch . arg) pair
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;;; for a -o, -n, -m, -l, or -lm switch.
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;;; - Terminating switch is one of {s, c, #f} for -s or -s<num>, -c,
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;;; and -- respectively.
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;;; - Terminating arg is the <exp> arg to -c, the <script> arg to -s,
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;;; the input port for -s<num>, otw #f.
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;;; - top-entry is the <entry> arg to a -e; #f if none.
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;;; - command-line args are what's left over after picking off the scsh
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;;; switches.
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(define (parse-scsh-args args)
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(let lp ((args (meta-arg-process-arglist args))
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(switches '()) ; A list of handler thunks
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(top-entry #f) ; -t <entry>
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(need-script? #f)) ; Found a -ds or -dm?
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(if (pair? args)
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(let ((arg (car args))
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(args (cdr args)))
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(cond ((string=? arg "-c")
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(if (or need-script? top-entry (not (pair? args)))
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(bad-arg)
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(values (reverse switches) 'c (car args)
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top-entry (cdr args))))
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((string=? arg "-s")
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(if (not (pair? args))
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(bad-arg "-s switch requires argument")
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(values (reverse switches) 's (car args)
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top-entry (cdr args))))
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;; -s<num>
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((regexp-exec fd-script-regexp arg) =>
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(lambda (m)
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(let* ((fd (string->number (match:substring m 1) 10))
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(p (fdes->inport fd)))
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(release-port-handle p) ; Unreveal the port.
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(values (reverse switches)
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's
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(fdes->inport fd)
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top-entry args))))
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((string=? arg "--")
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(if need-script?
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(bad-arg "-ds or -dm switch requires -s <script>")
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(values (reverse switches) #f #f top-entry args)))
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((or (string=? arg "-ds")
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(string=? arg "-dm"))
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(lp args (cons arg switches) top-entry #t))
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((or (string=? arg "-l")
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(string=? arg "-lm"))
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(if (pair? args)
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(lp (cdr args)
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(cons (cons arg (car args)) switches)
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top-entry
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need-script?)
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(bad-arg "Switch requires argument" arg)))
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((or (string=? arg "-o")
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(string=? arg "-n")
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(string=? arg "-m"))
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(if (pair? args)
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(let* ((s (car args))
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(name (if (and (string=? arg "-n")
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(string=? s "#f"))
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#f ; -n #f treated specially.
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(string->symbol s))))
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(lp (cdr args)
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(cons (cons arg name) switches)
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top-entry
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need-script?))
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(bad-arg "Switch requires argument" arg)))
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((string=? arg "-e")
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(lp (cdr args) switches
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(string->symbol (car args)) need-script?))
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(else (bad-arg "Unknown switch" arg))))
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(values (reverse switches) #f #f top-entry '()))))
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(define fd-script-regexp (make-regexp "^-s([0-9]+)$"))
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;;; Do each -ds, -dm, -o, -n, -m, -l, and -lm switch, and return the final
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;;; result package and a flag saying if the script was loaded by a -ds or -dm.
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(define (do-switches switches script-file)
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; (format #t "Switches = ~a~%" switches)
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(let lp ((switches switches)
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(script-loaded? #f))
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(if (pair? switches)
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(let ((switch (car switches))
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(switches (cdr switches)))
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; (format #t "Doing switch ~a~%" switch)
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(cond
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((equal? switch "-ds")
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(load-quietly script-file (interaction-environment))
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; (format #t "loaded script ~s~%" script-file)
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(lp switches #t))
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((equal? switch "-dm")
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(load-quietly script-file (config-package))
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; (format #t "loaded module ~s~%" script-file)
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(lp switches #t))
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((string=? (car switch) "-l")
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; (format #t "loading file ~s~%" (cdr switch))
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(load-quietly (cdr switch) (interaction-environment))
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(lp switches script-loaded?))
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((string=? (car switch) "-lm")
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; (format #t "loading module file ~s~%" (cdr switch))
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(load-quietly (cdr switch) (config-package))
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(lp switches script-loaded?))
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((string=? (car switch) "-o")
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(let ((struct-name (cdr switch))
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(cp (config-package)))
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;; Should not be necessary to do this ensure-loaded, but it is.
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(really-ensure-loaded #f (get-struct cp struct-name))
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(package-open! (interaction-environment)
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(lambda () (get-struct cp struct-name)))
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; (format #t "Opened ~s~%" struct-name)
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(lp switches script-loaded?)))
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((string=? (car switch) "-n")
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(let* ((name (cdr switch))
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(pack (new-empty-package name))) ; Contains nothing
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(if name ; & exports nothing.
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(let* ((iface (make-simple-interface #f '()))
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(struct (make-structure pack iface)))
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(environment-define! (config-package) name struct)))
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(set-interaction-environment! pack)
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(lp switches script-loaded?)))
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((string=? (car switch) "-m")
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; (format #t "struct-name ~s~%" (cdr switch))
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(let ((struct (get-struct (config-package) (cdr switch))))
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; (format #t "struct-name ~s, struct ~s~%" (cdr switch) struct)
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(let ((pack (structure-package struct)))
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; (format #t "package ~s~%" pack)
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(set-interaction-environment! pack)
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(really-ensure-loaded #f struct)
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; (format #t "Switched to ~s~%" pack)
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(lp switches script-loaded?))))
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(else (error "Impossible error in do-switches. Report to developers."))))
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script-loaded?)))
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;;; (user-environment) probably isn't right. What is this g-r-t stuff?
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;;; Check w/jar.
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(define (new-empty-package name)
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(make-simple-package '() #t
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(get-reflective-tower (user-environment)) ; ???
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name))
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(define (parse-switches-and-execute args context)
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(receive (switches term-switch term-val top-entry args)
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(parse-scsh-args args)
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((with-new-session context ; "Log in" user.
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(current-input-port) (current-output-port)
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args
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term-switch ; batch? (or interactive?)
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(lambda ()
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(with-interaction-environment (user-environment) ; <-- from CONTEXT.
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(lambda ()
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;; Have to do these before calling DO-SWITCHES, because actions
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;; performed while processing the switches may use these guys.
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(set-command-line-args!
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(cons (if (eq? term-switch 's)
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(if (string? term-val)
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term-val ; Script file.
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"file-descriptor-script"); -s<num>
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"scsh")
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args))
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;; Set HOME-DIRECTORY and EXEC-PATH-LIST,
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;; quietly if not running an interactive script.
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(init-scsh-vars term-switch)
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(let* ((script-loaded? (do-switches switches term-val)))
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(if (and (not script-loaded?) ; There wasn't a -ds or -dm,
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(eq? term-switch 's)) ; but there is a script,
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(load-quietly term-val ; so load it now.
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(interaction-environment)))
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(cond ((not term-switch) ; -- interactive
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(interrupt-before-heap-overflow!)
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(command-loop (lambda ()
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(display "Scsh ")
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(display scsh-version-string)
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(newline))
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#f))
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;; COMMAND-LOOP returns a continuation when it exits,
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;; which gets invoked outside the W-N-S above. I.e.,
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;; we "log out" and start over.
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((eq? term-switch 'c)
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(eval (read-exactly-one-sexp-from-string term-val)
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(interaction-environment))
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(exit 0))
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(top-entry ; There was a -e <entry>.
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((eval top-entry (interaction-environment))
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(command-line))
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(exit 0))
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;; Otherwise, the script executed as it loaded,
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;; so we're done.
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(else (exit 0))
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)))))))))
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(define (read-exactly-one-sexp-from-string s)
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(with-current-input-port (make-string-input-port s)
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(let ((val (read)))
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(if (eof-object? (read)) val
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(error "More than one value read from string" s)))))
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(define (bad-arg . msg)
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(with-current-output-port (error-output-port)
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(for-each (lambda (x) (display x) (write-char #\space)) msg)
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(newline)
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(display "Useage: scsh [meta-arg] [switch ..] [end-option arg ...]
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meta-arg: \\ <script-file-name>
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switch: -e <entry-point> Specify top-level entry point.
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-o <structure> Open structure in current package.
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-m <package> Switch to package.
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-n <new-package> Switch to new package.
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-lm <module-file-name> Load module into config package.
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-l <file-name> Load file into current package.
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-ds Do script.
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-dm Do script module.
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end-option: -s <script> Specify script.
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-s<num> Script is on file descriptor <num>.
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-c <exp> Evaluate expression.
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-- Interactive session.
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"))
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(exit -1))
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(define (repl)
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(command-loop (lambda () (set-batch-mode?! #f))
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#f))
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