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+;;; cmuscheme.el -- Scheme process in a buffer. Adapted from tea.el.
+;;; Copyright Olin Shivers (1988)
+;;; Please imagine a long, tedious, legalistic 5-page gnu-style copyright
+;;; notice appearing here to the effect that you may use this code any
+;;; way you like, as long as you don't charge money for it, remove this
+;;; notice, or hold me liable for its results.
+;;;
+;;;    This is a customisation of comint-mode (see comint.el)
+;;;
+;;; Written by Olin Shivers (olin.shivers@cs.cmu.edu). With bits and pieces
+;;; lifted from scheme.el, shell.el, clisp.el, newclisp.el, cobol.el, et al..
+;;; 8/88
+;;;
+;;; Please send me bug reports, bug fixes, and extensions, so that I can
+;;; merge them into the master source.
+;;;
+;;; The changelog is at the end of this file.
+;;;
+;;; NOTE: MIT Cscheme, when invoked with the -emacs flag, has a special user
+;;; interface that communicates process state back to the superior emacs by
+;;; outputting special control sequences. The gnumacs package, xscheme.el, has
+;;; lots and lots of special purpose code to read these control sequences, and
+;;; so is very tightly integrated with the cscheme process. The cscheme
+;;; interrupt handler and debugger read single character commands in cbreak
+;;; mode; when this happens, xscheme.el switches to special keymaps that bind
+;;; the single letter command keys to emacs functions that directly send the
+;;; character to the scheme process.  Cmuscheme mode does *not* provide this
+;;; functionality. If you are a cscheme user, you may prefer to use the
+;;; xscheme.el/cscheme -emacs interaction.
+;;; 
+;;; Here's a summary of the pros and cons, as I see them.
+;;; xscheme: Tightly integrated with inferior cscheme process!  A few commands
+;;;	     not in cmuscheme. But. Integration is a bit of a hack.  Input
+;;;	     history only keeps the immediately prior input. Bizarre
+;;;	     keybindings.
+;;; 
+;;; cmuscheme: Not tightly integrated with inferior cscheme process.  But.
+;;;            Carefully integrated functionality with the entire suite of
+;;;            comint-derived CMU process modes. Keybindings reminiscent of
+;;;            Zwei and Hemlock. Good input history. A few commands not in
+;;;            xscheme.
+;;;  
+;;; It's a tradeoff. Pay your money; take your choice. If you use a Scheme
+;;; that isn't Cscheme, of course, there isn't a choice. Xscheme.el is *very*
+;;; Cscheme-specific; you must use cmuscheme.el.  Interested parties are
+;;; invited to port xscheme functionality on top of comint mode...
+
+;; YOUR .EMACS FILE
+;;=============================================================================
+;; Some suggestions for your .emacs file.
+;;
+;; ; If cmuscheme lives in some non-standard directory, you must tell emacs
+;; ; where to get it. This may or may not be necessary.
+;; (setq load-path (cons (expand-file-name "~jones/lib/emacs") load-path))
+;;
+;; ; Autoload run-scheme from file cmuscheme.el
+;; (autoload 'run-scheme "cmuscheme"
+;;           "Run an inferior Scheme process."
+;;           t)
+;;
+;; ; Files ending in ".scm" are Scheme source, 
+;; ; so put their buffers in scheme-mode.
+;; (setq auto-mode-alist 
+;;       (cons '("\\.scm$" . scheme-mode)  
+;;             auto-mode-alist))
+;;
+;; ; Define C-c t to run my favorite command in inferior scheme mode:
+;; (setq cmuscheme-load-hook
+;;       '((lambda () (define-key inferior-scheme-mode-map "\C-ct"
+;;                                'favorite-cmd))))
+;;;
+;;; Unfortunately, scheme.el defines run-scheme to autoload from xscheme.el.
+;;; This will womp your declaration to autoload run-scheme from cmuscheme.el
+;;; if you haven't loaded cmuscheme in before scheme. Three fixes:
+;;; - Put the autoload on your scheme mode hook and in your .emacs toplevel:
+;;;   (setq scheme-mode-hook
+;;;         '((lambda () (autoload 'run-scheme "cmuscheme"
+;;;                                "Run an inferior Scheme" t))))
+;;;   (autoload 'run-scheme "cmuscheme" "Run an inferior Scheme" t)
+;;;   Now when scheme.el autoloads, it will restore the run-scheme autoload.
+;;; - Load cmuscheme.el in your .emacs: (load-library 'cmuscheme)
+;;; - Change autoload declaration in scheme.el to point to cmuscheme.el:
+;;;   (autoload 'run-scheme "cmuscheme" "Run an inferior Scheme" t)
+;;;   *or* just delete the autoload declaration from scheme.el altogether,
+;;;   which will allow the autoload in your .emacs to have its say.
+
+(provide 'cmuscheme)
+(require 'scheme)
+(require 'comint)
+
+;;; INFERIOR SCHEME MODE STUFF
+;;;============================================================================
+
+(defvar inferior-scheme-mode-hook nil
+  "*Hook for customising inferior-scheme mode.")
+(defvar inferior-scheme-mode-map nil)
+
+(cond ((not inferior-scheme-mode-map)
+       (setq inferior-scheme-mode-map
+	     (full-copy-sparse-keymap comint-mode-map))
+       (define-key inferior-scheme-mode-map "\M-\C-x" ;gnu convention
+	           'scheme-send-definition)
+       (define-key inferior-scheme-mode-map "\C-x\C-e" 'scheme-send-last-sexp)
+       (define-key inferior-scheme-mode-map "\C-c\C-l" 'scheme-load-file)
+       (define-key inferior-scheme-mode-map "\C-c\C-k" 'scheme-compile-file)
+       (scheme-mode-commands inferior-scheme-mode-map))) 
+
+;; Install the process communication commands in the scheme-mode keymap.
+(define-key scheme-mode-map "\M-\C-x" 'scheme-send-definition);gnu convention
+(define-key scheme-mode-map "\C-x\C-e" 'scheme-send-last-sexp);gnu convention
+(define-key scheme-mode-map "\C-c\C-e" 'scheme-send-definition)
+(define-key scheme-mode-map "\C-c\M-e" 'scheme-send-definition-and-go)
+(define-key scheme-mode-map "\C-c\C-r" 'scheme-send-region)
+(define-key scheme-mode-map "\C-c\M-r" 'scheme-send-region-and-go)
+(define-key scheme-mode-map "\C-c\M-c" 'scheme-compile-definition)
+(define-key scheme-mode-map "\C-c\C-c" 'scheme-compile-definition-and-go)
+(define-key scheme-mode-map "\C-c\C-z" 'switch-to-scheme)
+(define-key scheme-mode-map "\C-c\C-l" 'scheme-load-file)
+(define-key scheme-mode-map "\C-c\C-k" 'scheme-compile-file) ;k for "kompile"
+
+(defun inferior-scheme-mode ()
+  "Major mode for interacting with an inferior Scheme process.
+
+The following commands are available:
+\\{inferior-scheme-mode-map}
+
+A Scheme process can be fired up with M-x run-scheme.
+
+Customisation: Entry to this mode runs the hooks on comint-mode-hook and
+inferior-scheme-mode-hook (in that order).
+
+You can send text to the inferior Scheme process from other buffers containing
+Scheme source.  
+    switch-to-scheme switches the current buffer to the Scheme process buffer.
+    scheme-send-definition sends the current definition to the Scheme process.
+    scheme-compile-definition compiles the current definition.
+    scheme-send-region sends the current region to the Scheme process.
+    scheme-compile-region compiles the current region.
+
+    scheme-send-definition-and-go, scheme-compile-definition-and-go,
+        scheme-send-region-and-go, and scheme-compile-region-and-go
+        switch to the Scheme process buffer after sending their text.
+For information on running multiple processes in multiple buffers, see
+documentation for variable scheme-buffer.
+
+Commands:
+Return after the end of the process' output sends the text from the 
+    end of process to point.
+Return before the end of the process' output copies the sexp ending at point
+    to the end of the process' output, and sends it.
+Delete converts tabs to spaces as it moves back.
+Tab indents for Scheme; with argument, shifts rest
+    of expression rigidly with the current line.
+C-M-q does Tab on each line starting within following expression.
+Paragraphs are separated only by blank lines.  Semicolons start comments.
+If you accidentally suspend your process, use \\[comint-continue-subjob]
+to continue it."
+  (interactive)
+  (comint-mode)
+  ;; Customise in inferior-scheme-mode-hook
+  (setq comint-prompt-regexp "^[^>]*>+ *") ; OK for cscheme, oaklisp, T,...
+  (scheme-mode-variables)
+  (setq major-mode 'inferior-scheme-mode)
+  (setq mode-name "Inferior Scheme")
+  (setq mode-line-process '(": %s"))
+  (use-local-map inferior-scheme-mode-map)
+  (setq comint-input-filter (function scheme-input-filter))
+  (setq comint-input-sentinel (function ignore))
+  (setq comint-get-old-input (function scheme-get-old-input))
+  (run-hooks 'inferior-scheme-mode-hook))
+
+(defun scheme-input-filter (str)
+  "Don't save anything matching inferior-scheme-filter-regexp"
+  (not (string-match inferior-scheme-filter-regexp str)))
+
+(defvar inferior-scheme-filter-regexp "\\`\\s *\\S ?\\S ?\\s *\\'"
+  "*Input matching this regexp are not saved on the history list.
+Defaults to a regexp ignoring all inputs of 0, 1, or 2 letters.")
+
+(defun scheme-get-old-input ()
+  "Snarf the sexp ending at point"
+  (save-excursion
+    (let ((end (point)))
+      (backward-sexp)
+      (buffer-substring (point) end))))
+
+(defun scheme-args-to-list (string)
+  (let ((where (string-match "[ \t]" string)))
+    (cond ((null where) (list string))
+	  ((not (= where 0))
+	   (cons (substring string 0 where)
+		 (scheme-args-to-list (substring string (+ 1 where)
+						 (length string)))))
+	  (t (let ((pos (string-match "[^ \t]" string)))
+	       (if (null pos)
+		   nil
+		 (scheme-args-to-list (substring string pos
+						 (length string)))))))))
+
+(defvar scheme-program-name "scheme"
+  "*Program invoked by the run-scheme command")
+
+;;; Obsolete
+(defun scheme (&rest foo)
+  "Use run-scheme"
+  (interactive)
+  (message "Use run-scheme")
+  (ding))
+
+(defun run-scheme (cmd)
+  "Run an inferior Scheme process, input and output via buffer *scheme*.
+If there is a process already running in *scheme*, just switch to that buffer.
+With argument, allows you to edit the command line (default is value
+of scheme-program-name).  Runs the hooks from inferior-scheme-mode-hook
+\(after the comint-mode-hook is run).
+\(Type \\[describe-mode] in the process buffer for a list of commands.)"
+
+  (interactive (list (if current-prefix-arg
+			 (read-string "Run Scheme: " scheme-program-name)
+			 scheme-program-name)))
+  (if (not (comint-check-proc "*scheme*"))
+      (let ((cmdlist (scheme-args-to-list cmd)))
+	(set-buffer (apply 'make-comint "scheme" (car cmdlist)
+			   nil (cdr cmdlist)))
+	(inferior-scheme-mode)))
+  (setq scheme-buffer "*scheme*")
+  (switch-to-buffer "*scheme*"))
+
+
+(defun scheme-send-region (start end)
+  "Send the current region to the inferior Scheme process."
+  (interactive "r")
+  (comint-send-region (scheme-proc) start end)
+  (comint-send-string (scheme-proc) "\n"))
+
+(defun scheme-send-definition ()
+  "Send the current definition to the inferior Scheme process."
+  (interactive)
+  (save-excursion
+   (end-of-defun)
+   (let ((end (point)))
+     (beginning-of-defun)
+     (scheme-send-region (point) end))))
+
+(defun scheme-send-last-sexp ()
+  "Send the previous sexp to the inferior Scheme process."
+  (interactive)
+  (scheme-send-region (save-excursion (backward-sexp) (point)) (point)))
+
+(defvar scheme-compile-exp-command "(compile '%s)"
+  "*Template for issuing commands to compile arbitrary Scheme expressions.")
+
+(defun scheme-compile-region (start end)
+  "Compile the current region in the inferior Scheme process
+\(A BEGIN is wrapped around the region: (BEGIN <region>))"
+  (interactive "r")
+  (comint-send-string (scheme-proc) (format scheme-compile-exp-command
+					    (format "(begin %s)"
+						    (buffer-substring start end))))
+  (comint-send-string (scheme-proc) "\n"))
+
+(defun scheme-compile-definition ()
+  "Compile the current definition in the inferior Scheme process."
+  (interactive)
+  (save-excursion
+   (end-of-defun)
+   (let ((end (point)))
+     (beginning-of-defun)
+     (scheme-compile-region (point) end))))
+
+(defun switch-to-scheme (eob-p)
+  "Switch to the scheme process buffer.
+With argument, positions cursor at end of buffer."
+  (interactive "P")
+  (if (get-buffer scheme-buffer)
+      (pop-to-buffer scheme-buffer)
+      (error "No current process buffer. See variable scheme-buffer."))
+  (cond (eob-p
+	 (push-mark)
+	 (goto-char (point-max)))))
+
+(defun scheme-send-region-and-go (start end)
+  "Send the current region to the inferior Scheme process,
+and switch to the process buffer."
+  (interactive "r")
+  (scheme-send-region start end)
+  (switch-to-scheme t))
+
+(defun scheme-send-definition-and-go ()
+  "Send the current definition to the inferior Scheme, 
+and switch to the process buffer."
+  (interactive)
+  (scheme-send-definition)
+  (switch-to-scheme t))
+
+(defun scheme-compile-definition-and-go ()
+  "Compile the current definition in the inferior Scheme, 
+and switch to the process buffer."
+  (interactive)
+  (scheme-compile-definition)
+  (switch-to-scheme t))
+
+(defun scheme-compile-region-and-go (start end)
+  "Compile the current region in the inferior Scheme, 
+and switch to the process buffer."
+  (interactive "r")
+  (scheme-compile-region start end)
+  (switch-to-scheme t))
+
+(defvar scheme-source-modes '(scheme-mode)
+  "*Used to determine if a buffer contains Scheme source code.
+If it's loaded into a buffer that is in one of these major modes, it's
+considered a scheme source file by scheme-load-file and scheme-compile-file.
+Used by these commands to determine defaults.")
+
+(defvar scheme-prev-l/c-dir/file nil
+  "Caches the (directory . file) pair used in the last scheme-load-file or
+scheme-compile-file command. Used for determining the default in the 
+next one.")
+
+(defun scheme-load-file (file-name)
+  "Load a Scheme file into the inferior Scheme process."
+  (interactive (comint-get-source "Load Scheme file: " scheme-prev-l/c-dir/file
+				  scheme-source-modes t)) ; T because LOAD 
+                                                          ; needs an exact name
+  (comint-check-source file-name) ; Check to see if buffer needs saved.
+  (setq scheme-prev-l/c-dir/file (cons (file-name-directory    file-name)
+				       (file-name-nondirectory file-name)))
+  (comint-send-string (scheme-proc) (concat "(load \""
+					    file-name
+					    "\"\)\n")))
+
+(defun scheme-compile-file (file-name)
+  "Compile a Scheme file in the inferior Scheme process."
+  (interactive (comint-get-source "Compile Scheme file: "
+				  scheme-prev-l/c-dir/file
+				  scheme-source-modes
+				  nil)) ; NIL because COMPILE doesn't
+                                        ; need an exact name.
+  (comint-check-source file-name) ; Check to see if buffer needs saved.
+  (setq scheme-prev-l/c-dir/file (cons (file-name-directory    file-name)
+				       (file-name-nondirectory file-name)))
+  (comint-send-string (scheme-proc) (concat "(compile-file \""
+					    file-name
+					    "\"\)\n")))
+
+
+(defvar scheme-buffer nil "*The current scheme process buffer.
+
+MULTIPLE PROCESS SUPPORT
+===========================================================================
+Cmuscheme.el supports, in a fairly simple fashion, running multiple Scheme
+processes. To run multiple Scheme processes, you start the first up with
+\\[run-scheme]. It will be in a buffer named *scheme*. Rename this buffer
+with \\[rename-buffer]. You may now start up a new process with another
+\\[run-scheme]. It will be in a new buffer, named *scheme*. You can
+switch between the different process buffers with \\[switch-to-buffer].
+
+Commands that send text from source buffers to Scheme processes --
+like scheme-send-definition or scheme-compile-region -- have to choose a
+process to send to, when you have more than one Scheme process around. This
+is determined by the global variable scheme-buffer. Suppose you
+have three inferior Schemes running:
+    Buffer	Process
+    foo		scheme
+    bar		scheme<2>
+    *scheme*    scheme<3>
+If you do a \\[scheme-send-definition-and-go] command on some Scheme source
+code, what process do you send it to?
+
+- If you're in a process buffer (foo, bar, or *scheme*), 
+  you send it to that process.
+- If you're in some other buffer (e.g., a source file), you
+  send it to the process attached to buffer scheme-buffer.
+This process selection is performed by function scheme-proc.
+
+Whenever \\[run-scheme] fires up a new process, it resets scheme-buffer
+to be the new process's buffer. If you only run one process, this will
+do the right thing. If you run multiple processes, you can change
+scheme-buffer to another process buffer with \\[set-variable].
+
+More sophisticated approaches are, of course, possible. If you find youself
+needing to switch back and forth between multiple processes frequently,
+you may wish to consider ilisp.el, a larger, more sophisticated package
+for running inferior Lisp and Scheme processes. The approach taken here is
+for a minimal, simple implementation. Feel free to extend it.")
+
+(defun scheme-proc ()
+  "Returns the current scheme process. See variable scheme-buffer."
+  (let ((proc (get-buffer-process (if (eq major-mode 'inferior-scheme-mode)
+				      (current-buffer)
+				      scheme-buffer))))
+    (or proc
+	(error "No current process. See variable scheme-buffer"))))
+
+
+;;; Do the user's customisation...
+
+(defvar cmuscheme-load-hook nil
+  "This hook is run when cmuscheme is loaded in.
+This is a good place to put keybindings.")
+	
+(run-hooks 'cmuscheme-load-hook)
+
+
+;;; CHANGE LOG
+;;; ===========================================================================
+;;; 8/88 Olin
+;;; Created. 
+;;;
+;;; 2/15/89 Olin
+;;; Removed -emacs flag from process invocation. It's only useful for
+;;; cscheme, and makes cscheme assume it's running under xscheme.el,
+;;; which messes things up royally. A bug.
+;;;
+;;; 5/22/90 Olin
+;;; - Upgraded to use comint-send-string and comint-send-region.
+;;; - run-scheme now offers to let you edit the command line if
+;;;   you invoke it with a prefix-arg. M-x scheme is redundant, and
+;;;   has been removed.
+;;; - Explicit references to process "scheme" have been replaced with
+;;;   (scheme-proc). This allows better handling of multiple process bufs.
+;;; - Added scheme-send-last-sexp, bound to C-x C-e. A gnu convention.
+;;; - Have not added process query facility a la cmulisp.el's lisp-show-arglist
+;;;   and friends, but interested hackers might find a useful application
+;;;   of this facility.
+;;;
+;;; 3/12/90 Olin
+;;; - scheme-load-file and scheme-compile-file no longer switch-to-scheme.
+;;;   Tale suggested this.