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1 ;;; cmuscheme.el --- Scheme process in a buffer. Adapted from tea.el.
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2
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3 ;; Copyright (C) 1988, 1994 Free Software Foundation, Inc.
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4
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5 ;; Author: Olin Shivers <olin.shivers@cs.cmu.edu>
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6 ;; Maintainer: FSF
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7 ;; Keywords: processes, lisp
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Synched up with: FSF 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; This is a customisation of comint-mode (see comint.el)
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30 ;;
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31 ;; Written by Olin Shivers (olin.shivers@cs.cmu.edu). With bits and pieces
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32 ;; lifted from scheme.el, shell.el, clisp.el, newclisp.el, cobol.el, et al..
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33 ;; 8/88
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34 ;;
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35 ;; Please send me bug reports, bug fixes, and extensions, so that I can
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36 ;; merge them into the master source.
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37 ;;
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38 ;; The changelog is at the end of this file.
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39 ;;
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40 ;; NOTE: MIT Cscheme, when invoked with the -emacs flag, has a special user
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41 ;; interface that communicates process state back to the superior emacs by
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42 ;; outputting special control sequences. The gnumacs package, xscheme.el, has
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43 ;; lots and lots of special purpose code to read these control sequences, and
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44 ;; so is very tightly integrated with the cscheme process. The cscheme
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45 ;; interrupt handler and debugger read single character commands in cbreak
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46 ;; mode; when this happens, xscheme.el switches to special keymaps that bind
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47 ;; the single letter command keys to emacs functions that directly send the
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48 ;; character to the scheme process. Cmuscheme mode does *not* provide this
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49 ;; functionality. If you are a cscheme user, you may prefer to use the
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50 ;; xscheme.el/cscheme -emacs interaction.
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51 ;;
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52 ;; Here's a summary of the pros and cons, as I see them.
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53 ;; xscheme: Tightly integrated with inferior cscheme process! A few commands
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54 ;; not in cmuscheme. But. Integration is a bit of a hack. Input
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55 ;; history only keeps the immediately prior input. Bizarre
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56 ;; keybindings.
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57 ;;
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58 ;; cmuscheme: Not tightly integrated with inferior cscheme process. But.
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59 ;; Carefully integrated functionality with the entire suite of
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60 ;; comint-derived CMU process modes. Keybindings reminiscent of
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61 ;; Zwei and Hemlock. Good input history. A few commands not in
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62 ;; xscheme.
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63 ;;
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64 ;; It's a tradeoff. Pay your money; take your choice. If you use a Scheme
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65 ;; that isn't Cscheme, of course, there isn't a choice. Xscheme.el is *very*
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66 ;; Cscheme-specific; you must use cmuscheme.el. Interested parties are
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67 ;; invited to port xscheme functionality on top of comint mode...
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68
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69 ;;; Code:
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70
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71 (require 'scheme)
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72 (require 'comint)
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73
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74 ;;; INFERIOR SCHEME MODE STUFF
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75 ;;;============================================================================
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76
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77 (defvar inferior-scheme-mode-hook nil
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78 "*Hook for customising inferior-scheme mode.")
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79 (defvar inferior-scheme-mode-map nil)
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80
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81 (cond ((not inferior-scheme-mode-map)
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82 (setq inferior-scheme-mode-map
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83 (copy-keymap comint-mode-map))
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84 (define-key inferior-scheme-mode-map "\M-\C-x" ;gnu convention
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85 'scheme-send-definition)
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86 (define-key inferior-scheme-mode-map "\C-x\C-e" 'scheme-send-last-sexp)
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87 (define-key inferior-scheme-mode-map "\C-c\C-l" 'scheme-load-file)
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88 (define-key inferior-scheme-mode-map "\C-c\C-k" 'scheme-compile-file)
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89 (scheme-mode-commands inferior-scheme-mode-map)))
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90
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91 ;; Install the process communication commands in the scheme-mode keymap.
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92 (define-key scheme-mode-map "\M-\C-x" 'scheme-send-definition);gnu convention
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93 (define-key scheme-mode-map "\C-x\C-e" 'scheme-send-last-sexp);gnu convention
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94 (define-key scheme-mode-map "\C-c\C-e" 'scheme-send-definition)
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95 (define-key scheme-mode-map "\C-c\M-e" 'scheme-send-definition-and-go)
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96 (define-key scheme-mode-map "\C-c\C-r" 'scheme-send-region)
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97 (define-key scheme-mode-map "\C-c\M-r" 'scheme-send-region-and-go)
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98 (define-key scheme-mode-map "\C-c\M-c" 'scheme-compile-definition)
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99 (define-key scheme-mode-map "\C-c\C-c" 'scheme-compile-definition-and-go)
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100 (define-key scheme-mode-map "\C-c\C-z" 'switch-to-scheme)
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101 (define-key scheme-mode-map "\C-c\C-l" 'scheme-load-file)
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102 (define-key scheme-mode-map "\C-c\C-k" 'scheme-compile-file) ;k for "kompile"
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103
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104 (defvar scheme-buffer)
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105
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106 (defun inferior-scheme-mode ()
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107 "Major mode for interacting with an inferior Scheme process.
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108
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109 The following commands are available:
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110 \\{inferior-scheme-mode-map}
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111
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112 A Scheme process can be fired up with M-x run-scheme.
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113
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114 Customisation: Entry to this mode runs the hooks on comint-mode-hook and
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115 inferior-scheme-mode-hook (in that order).
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116
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117 You can send text to the inferior Scheme process from other buffers containing
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118 Scheme source.
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119 switch-to-scheme switches the current buffer to the Scheme process buffer.
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120 scheme-send-definition sends the current definition to the Scheme process.
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121 scheme-compile-definition compiles the current definition.
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122 scheme-send-region sends the current region to the Scheme process.
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123 scheme-compile-region compiles the current region.
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124
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125 scheme-send-definition-and-go, scheme-compile-definition-and-go,
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126 scheme-send-region-and-go, and scheme-compile-region-and-go
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127 switch to the Scheme process buffer after sending their text.
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128 For information on running multiple processes in multiple buffers, see
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129 documentation for variable scheme-buffer.
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130
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131 Commands:
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132 Return after the end of the process' output sends the text from the
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133 end of process to point.
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134 Return before the end of the process' output copies the sexp ending at point
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135 to the end of the process' output, and sends it.
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136 Delete converts tabs to spaces as it moves back.
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137 Tab indents for Scheme; with argument, shifts rest
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138 of expression rigidly with the current line.
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139 C-M-q does Tab on each line starting within following expression.
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140 Paragraphs are separated only by blank lines. Semicolons start comments.
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141 If you accidentally suspend your process, use \\[comint-continue-subjob]
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142 to continue it."
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143 (interactive)
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144 (comint-mode)
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145 ;; Customise in inferior-scheme-mode-hook
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146 (setq comint-prompt-regexp "^[^>\n]*>+ *") ; OK for cscheme, oaklisp, T,...
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147 (scheme-mode-variables)
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148 (setq major-mode 'inferior-scheme-mode)
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149 (setq mode-name "Inferior Scheme")
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150 (setq mode-line-process '(":%s"))
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151 (use-local-map inferior-scheme-mode-map)
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152 (setq comint-input-filter (function scheme-input-filter))
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153 (setq comint-get-old-input (function scheme-get-old-input))
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154 (run-hooks 'inferior-scheme-mode-hook))
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155
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156 (defvar inferior-scheme-filter-regexp "\\`\\s *\\S ?\\S ?\\s *\\'"
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157 "*Input matching this regexp are not saved on the history list.
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158 Defaults to a regexp ignoring all inputs of 0, 1, or 2 letters.")
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159
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160 (defun scheme-input-filter (str)
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161 "Don't save anything matching inferior-scheme-filter-regexp"
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162 (not (string-match inferior-scheme-filter-regexp str)))
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163
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164 (defun scheme-get-old-input ()
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165 "Snarf the sexp ending at point"
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166 (save-excursion
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167 (let ((end (point)))
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168 (backward-sexp)
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169 (buffer-substring (point) end))))
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170
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171 (defun scheme-args-to-list (string)
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172 (let ((where (string-match "[ \t]" string)))
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173 (cond ((null where) (list string))
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174 ((not (= where 0))
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175 (cons (substring string 0 where)
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176 (scheme-args-to-list (substring string (+ 1 where)
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177 (length string)))))
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178 (t (let ((pos (string-match "[^ \t]" string)))
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179 (if (null pos)
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180 nil
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181 (scheme-args-to-list (substring string pos
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182 (length string)))))))))
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183
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184 (defvar scheme-program-name "scheme"
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185 "*Program invoked by the run-scheme command")
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186
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187 (defun run-scheme (cmd)
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188 "Run an inferior Scheme process, input and output via buffer *scheme*.
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189 If there is a process already running in `*scheme*', switch to that buffer.
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190 With argument, allows you to edit the command line (default is value
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191 of `scheme-program-name'). Runs the hooks `inferior-scheme-mode-hook'
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192 \(after the `comint-mode-hook' is run).
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193 \(Type \\[describe-mode] in the process buffer for a list of commands.)"
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194
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195 (interactive (list (if current-prefix-arg
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196 (read-string "Run Scheme: " scheme-program-name)
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197 scheme-program-name)))
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198 (if (not (comint-check-proc "*scheme*"))
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199 (let ((cmdlist (scheme-args-to-list cmd)))
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200 (set-buffer (apply 'make-comint "scheme" (car cmdlist)
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201 nil (cdr cmdlist)))
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202 (inferior-scheme-mode)))
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203 (setq scheme-program-name cmd)
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204 (setq scheme-buffer "*scheme*")
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205 (pop-to-buffer "*scheme*"))
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206 ;;;###autoload (add-hook 'same-window-buffer-names "*scheme*")
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207
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208 (defun scheme-send-region (start end)
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209 "Send the current region to the inferior Scheme process."
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210 (interactive "r")
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211 (comint-send-region (scheme-proc) start end)
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212 (comint-send-string (scheme-proc) "\n"))
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213
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214 (defun scheme-send-definition ()
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215 "Send the current definition to the inferior Scheme process."
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216 (interactive)
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217 (save-excursion
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218 (end-of-defun)
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219 (let ((end (point)))
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220 (beginning-of-defun)
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221 (scheme-send-region (point) end))))
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222
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223 (defun scheme-send-last-sexp ()
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224 "Send the previous sexp to the inferior Scheme process."
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225 (interactive)
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226 (scheme-send-region (save-excursion (backward-sexp) (point)) (point)))
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227
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228 (defvar scheme-compile-exp-command "(compile '%s)"
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229 "*Template for issuing commands to compile arbitrary Scheme expressions.")
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230
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231 (defun scheme-compile-region (start end)
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232 "Compile the current region in the inferior Scheme process.
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233 \(A BEGIN is wrapped around the region: (BEGIN <region>))"
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234 (interactive "r")
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235 (comint-send-string (scheme-proc) (format scheme-compile-exp-command
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236 (format "(begin %s)"
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237 (buffer-substring start end))))
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238 (comint-send-string (scheme-proc) "\n"))
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239
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240 (defun scheme-compile-definition ()
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241 "Compile the current definition in the inferior Scheme process."
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242 (interactive)
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243 (save-excursion
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244 (end-of-defun)
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245 (let ((end (point)))
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246 (beginning-of-defun)
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247 (scheme-compile-region (point) end))))
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248
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249 (defun switch-to-scheme (eob-p)
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250 "Switch to the scheme process buffer.
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251 With argument, positions cursor at end of buffer."
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252 (interactive "P")
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253 (if (get-buffer scheme-buffer)
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254 (pop-to-buffer scheme-buffer)
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255 (error "No current process buffer. See variable scheme-buffer."))
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256 (cond (eob-p
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257 (push-mark)
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258 (goto-char (point-max)))))
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259
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260 (defun scheme-send-region-and-go (start end)
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261 "Send the current region to the inferior Scheme process.
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262 Then switch to the process buffer."
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263 (interactive "r")
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264 (scheme-send-region start end)
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265 (switch-to-scheme t))
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266
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267 (defun scheme-send-definition-and-go ()
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268 "Send the current definition to the inferior Scheme.
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269 Then switch to the process buffer."
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270 (interactive)
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271 (scheme-send-definition)
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272 (switch-to-scheme t))
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273
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274 (defun scheme-compile-definition-and-go ()
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275 "Compile the current definition in the inferior Scheme.
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276 Then switch to the process buffer."
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277 (interactive)
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278 (scheme-compile-definition)
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279 (switch-to-scheme t))
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280
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281 (defun scheme-compile-region-and-go (start end)
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282 "Compile the current region in the inferior Scheme.
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283 Then switch to the process buffer."
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284 (interactive "r")
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285 (scheme-compile-region start end)
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286 (switch-to-scheme t))
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287
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288 (defvar scheme-source-modes '(scheme-mode)
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289 "*Used to determine if a buffer contains Scheme source code.
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290 If it's loaded into a buffer that is in one of these major modes, it's
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291 considered a scheme source file by scheme-load-file and scheme-compile-file.
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292 Used by these commands to determine defaults.")
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293
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294 (defvar scheme-prev-l/c-dir/file nil
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295 "Caches the last (directory . file) pair.
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296 Caches the last pair used in the last scheme-load-file or
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297 scheme-compile-file command. Used for determining the default in the
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298 next one.")
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299
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300 (defun scheme-load-file (file-name)
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301 "Load a Scheme file into the inferior Scheme process."
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302 (interactive (comint-get-source "Load Scheme file: " scheme-prev-l/c-dir/file
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303 scheme-source-modes t)) ; T because LOAD
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304 ; needs an exact name
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305 (comint-check-source file-name) ; Check to see if buffer needs saved.
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306 (setq scheme-prev-l/c-dir/file (cons (file-name-directory file-name)
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307 (file-name-nondirectory file-name)))
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308 (comint-send-string (scheme-proc) (concat "(load \""
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309 file-name
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310 "\"\)\n")))
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311
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312 (defun scheme-compile-file (file-name)
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313 "Compile a Scheme file in the inferior Scheme process."
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314 (interactive (comint-get-source "Compile Scheme file: "
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315 scheme-prev-l/c-dir/file
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316 scheme-source-modes
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317 nil)) ; NIL because COMPILE doesn't
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318 ; need an exact name.
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319 (comint-check-source file-name) ; Check to see if buffer needs saved.
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320 (setq scheme-prev-l/c-dir/file (cons (file-name-directory file-name)
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321 (file-name-nondirectory file-name)))
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322 (comint-send-string (scheme-proc) (concat "(compile-file \""
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323 file-name
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324 "\"\)\n")))
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325
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326
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327 (defvar scheme-buffer nil "*The current scheme process buffer.
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328
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329 MULTIPLE PROCESS SUPPORT
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330 ===========================================================================
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331 Cmuscheme.el supports, in a fairly simple fashion, running multiple Scheme
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332 processes. To run multiple Scheme processes, you start the first up with
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333 \\[run-scheme]. It will be in a buffer named *scheme*. Rename this buffer
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334 with \\[rename-buffer]. You may now start up a new process with another
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335 \\[run-scheme]. It will be in a new buffer, named *scheme*. You can
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336 switch between the different process buffers with \\[switch-to-buffer].
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337
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338 Commands that send text from source buffers to Scheme processes --
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339 like scheme-send-definition or scheme-compile-region -- have to choose a
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340 process to send to, when you have more than one Scheme process around. This
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341 is determined by the global variable scheme-buffer. Suppose you
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342 have three inferior Schemes running:
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343 Buffer Process
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344 foo scheme
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345 bar scheme<2>
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346 *scheme* scheme<3>
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347 If you do a \\[scheme-send-definition-and-go] command on some Scheme source
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348 code, what process do you send it to?
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349
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350 - If you're in a process buffer (foo, bar, or *scheme*),
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351 you send it to that process.
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352 - If you're in some other buffer (e.g., a source file), you
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353 send it to the process attached to buffer scheme-buffer.
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354 This process selection is performed by function scheme-proc.
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355
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356 Whenever \\[run-scheme] fires up a new process, it resets scheme-buffer
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357 to be the new process's buffer. If you only run one process, this will
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358 do the right thing. If you run multiple processes, you can change
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359 scheme-buffer to another process buffer with \\[set-variable].
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360
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361 More sophisticated approaches are, of course, possible. If you find yourself
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362 needing to switch back and forth between multiple processes frequently,
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363 you may wish to consider ilisp.el, a larger, more sophisticated package
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364 for running inferior Lisp and Scheme processes. The approach taken here is
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365 for a minimal, simple implementation. Feel free to extend it.")
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366
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367 (defun scheme-proc ()
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368 "Returns the current scheme process. See variable scheme-buffer."
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369 (let ((proc (get-buffer-process (if (eq major-mode 'inferior-scheme-mode)
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370 (current-buffer)
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371 scheme-buffer))))
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372 (or proc
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373 (error "No current process. See variable scheme-buffer"))))
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374
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375
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376 ;;; Do the user's customisation...
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377
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378 (defvar cmuscheme-load-hook nil
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379 "This hook is run when cmuscheme is loaded in.
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380 This is a good place to put keybindings.")
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381
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382 (run-hooks 'cmuscheme-load-hook)
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383
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384
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385 ;;; CHANGE LOG
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386 ;;; ===========================================================================
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387 ;;; 8/88 Olin
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388 ;;; Created.
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389 ;;;
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390 ;;; 2/15/89 Olin
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391 ;;; Removed -emacs flag from process invocation. It's only useful for
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392 ;;; cscheme, and makes cscheme assume it's running under xscheme.el,
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393 ;;; which messes things up royally. A bug.
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394 ;;;
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395 ;;; 5/22/90 Olin
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396 ;;; - Upgraded to use comint-send-string and comint-send-region.
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397 ;;; - run-scheme now offers to let you edit the command line if
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398 ;;; you invoke it with a prefix-arg. M-x scheme is redundant, and
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399 ;;; has been removed.
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400 ;;; - Explicit references to process "scheme" have been replaced with
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401 ;;; (scheme-proc). This allows better handling of multiple process bufs.
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402 ;;; - Added scheme-send-last-sexp, bound to C-x C-e. A gnu convention.
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403 ;;; - Have not added process query facility a la cmulisp.el's lisp-show-arglist
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404 ;;; and friends, but interested hackers might find a useful application
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405 ;;; of this facility.
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406 ;;;
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407 ;;; 3/12/90 Olin
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408 ;;; - scheme-load-file and scheme-compile-file no longer switch-to-scheme.
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409 ;;; Tale suggested this.
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410
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411 (provide 'cmuscheme)
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412
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413 ;;; cmuscheme.el ends here
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