;;; The packages that scsh uses/defines.
;;; Copyright (c) 1994 by Olin Shivers.

;;; Note: field-reader package (fr.scm) and here docs use READ-LINE.
;;; It is defined in rdelim.scm.

;;; You link up a scsh package by defining a package named OS-DEPENDENT
;;; that satisfies the interfaces for packages
;;;     buffered-io-flags
;;;     posix-fdflags 
;;;     posix-errno
;;;     posix-signals
;;; Anything else it provides should be specified in an interface called
;;; os-extras-interface. See the scsh structure below.
;;; Then the scsh structure can be instantiated.
;;;
;;; The architecture directories, like next/ and irix/ and so forth,
;;; provide packages that can serve as the os-dependent package. E.g.,
;;; the next-defs package, defined in next/packages.
;;;
;;; This whole mechanism would be better solved with a functor.
;;;     -Olin


;;; The LET-OPT package for optional argument parsing & defaulting
;;; is found in the let-opt.scm file.


(define-structure error-package (export error warn)
  (open signals))


(define-structure scsh-utilities scsh-utilities-interface
  (open bitwise error-package let-opt scheme)
  (files utilities))


;;; This guy goes into the FOR-SYNTAX part of scsh's syntax exports.
(define-structure scsh-syntax-helpers
  (export transcribe-extended-process-form)
  (open receiving	; receive
	error-package
	syntactic	; generated?
	scsh-utilities	; check-arg
	scheme
	)
  (files syntax-helpers))


;;; The bufpol/{block, line, none} values
(define-structure buffered-io-flags buffered-io-flags-interface
  (open defenum-package scheme)
  (files (machine bufpol)))

(define-structures ((scsh-regexp-package scsh-regexp-interface)
		    (scsh-regexp-internals (export %filter-C-strings!)))
  (open	defrec-package
	scsh-utilities
	define-foreign-syntax
	receiving
	error-package
	let-opt			; optional-arg parsing & defaulting
	scheme)
  (files re))


(define-structure char-set-package char-set-interface  
  (open error-package ascii scheme)
  (files char-set))


(define-structure field-reader-package scsh-field-reader-interface
  (open receiving		; receive
	char-set-package
	scsh-utilities
	error-package		; error
	scsh-level-0		; regexes and delimited readers
	let-opt			; optional-arg parsing & defaulting
	scheme
	)
  (files fr))


(define-structures
  ((awk-expander-package (export expand-awk))
   (awk-support-package (export next-range next-:range
				next-range: next-:range:)))
  (open receiving		; receive
	scsh-utilities	
	error-package		; error
	char-set-package
	scheme
	)
  (files awk))
	 

(define-structure awk-package awk-interface
  (open awk-support-package scsh-regexp-package receiving scheme)
  (for-syntax (open awk-expander-package scheme))
  (begin (define-syntax awk expand-awk)))


(define-structures ((tty-flags tty-flags-interface)
		    (scsh-internal-tty-flags scsh-internal-tty-flags-interface))
  (open scheme ascii bitwise)
  (files (machine tty-consts)))


(define-structure scsh-version scsh-version-interface
  (open scheme)
  (files scsh-version))

;;; The scsh-level-0 package is for implementation convenience.
;;; The scsh startup and top-level modules need access to scsh
;;; procedures, but they export procedures that are themselves
;;; part of scsh. So scsh-level-0 is the core scsh stuff, which is
;;; imported by these two modules. These modules all collectively
;;; export the whole scsh enchilada.

(define-structures
  ((scsh-level-0-internals (export set-command-line-args!
				   init-scsh-hindbrain
				   init-scsh-vars))
   (scsh-level-0
    (compound-interface posix-fdflags-interface
			posix-errno-interface
			posix-signals-interface
			sockets-network-interface ; Standard Network Interface
			os-extras-interface ; Extra stuff from OS.
			scsh-delimited-readers-interface
			scsh-errors-interface
			scsh-io-interface
			scsh-file-interface
			scsh-process-interface
			scsh-process-state-interface
			scsh-user/group-db-interface
			scsh-command-line-interface
			scsh-signals-interface
			scsh-environment-interface
			scsh-home-interface
			scsh-string-interface
			scsh-file-names-interface
			scsh-misc-interface
			scsh-high-level-process-interface
			scsh-time-interface ; new in 0.2
			scsh-sockets-interface ; new in 0.3
			tty-interface ; new in 0.4
			scsh-version-interface
			char-set-interface
			signal-handler-interface
			;; This stuff would probably be better off kept
			;; in separate modules, but we'll toss it in for now.
			(interface-of ascii) ; char<->ascii
			string-ports-interface
			)))
  (for-syntax (open scsh-syntax-helpers scheme))
  (open externals
	structure-refs
	cig-aux
	receiving
	defrec-package
	define-foreign-syntax
	formats
	os-dependent		; OS dependent stuff
	buffered-io-flags	; stdio dependent
	ascii
	records
	extended-ports
	ports
	build
	bigbit
	bitwise
	signals
	conditions
	scsh-utilities
	handle
	fluids
	weak

	scsh-regexp-package
	scsh-regexp-internals
	char-set-package
	scsh-version
	tty-flags
	scsh-internal-tty-flags	; Not exported
	let-opt			; optional-arg parsing & defaulting
	
	interrupts	; signal handler code

	scheme
	)

  (access command-processor
	  escapes
	  ports		; S48's force-output
	  formats
	  records	; I don't think this is necessary. !!!
	  scheme)	; For accessing the normal I/O operators.

  (begin (define set-batch-mode?!
	   (structure-ref command-processor set-batch-mode?!))
	 (define with-continuation (structure-ref escapes with-continuation)))

  (files syntax
	 syscalls
	 select
	 fname
	 stringcoll
	 scsh-condition
	 rw
	 newports
	 fdports
	 procobj		; New in release 0.4.
	 (machine waitcodes)	; OS dependent code.
	 filesys
	 fileinfo
	 glob
	 filemtch
	 rdelim
	 time			; New in release 0.2.
	 (machine time_dep)
	 network		; New in release 0.3.
	 endian			; New in release 0.4.
	 flock			; New in release 0.4.
	 tty			; New in release 0.4.
	 pty			; New in release 0.4.
	 sighandlers		; New in release 0.5.
	 scsh
	 ))

(define-structure defrec-package (export (define-record :syntax))
  (open records scheme)
  (for-syntax (open scheme error-package receiving))
  (files defrec))

(define-structure defenum-package (export (define-enum-constant  :syntax)
					  (define-enum-constants :syntax))
  (open scheme)
  (files enumconst))

;;; This code opens so many modules of gruesome, low-level S48 internals 
;;; that these two modules are segregated into separate packages, each
;;; exporting just two definitions.

(define-structure scsh-startup-package (export dump-scsh-program dump-scsh)
  (open scsh-level-0-internals	; init-scsh-* set-command-line-args!
	scsh-level-0		; error-output-port command-line-arguments
	scsh-top-package	; parse-switches-and-execute
	handle			; with-handler
	command-processor	; user-context
	write-images		; write-image
	build-internals		; simple-condition-handler
	low-level		; flush-the-symbol-table!
	command-processor	; command-output
	filenames		; translate
	scheme-level-2-internal	; usual-resumer
	scheme)
  (files startup))

(define-structure scsh-top-package (export parse-switches-and-execute repl)
  (open command-processor
	ensures-loaded
	environments
	error-package
	evaluation
	extended-ports
	interfaces
	interrupts
	package-commands-internal
	package-mutation
	packages
	receiving
	scsh-version
	scsh-level-0		; with-current-input-port error-output-port
				; with-current-output-port exit regexp
	scsh-level-0-internals	; set-command-line-args! init-scsh-vars
	scheme)
  (files top meta-arg))


(define-structure scsh
  (compound-interface (interface-of scsh-level-0)
		      (interface-of scsh-startup-package)
		      scsh-field-reader-interface 	; new in 0.3
;		      scsh-dbm-interface
		      (export repl)
		      awk-interface)

  (open structure-refs
	scsh-level-0
	scsh-level-0-internals
	scsh-startup-package
;	dbm
	awk-package
	field-reader-package
	scheme)

  (access scsh-top-package)
  (begin (define repl (structure-ref scsh-top-package repl))))

(define-structure scsh-here-string-hax (export)
  (open reading
	receiving
	scsh		; Just need the delimited readers.
	features	; make-immutable!
	scheme)
  (files here))