1 | ;;; top-level.lisp |
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2 | ;;; |
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3 | ;;; Copyright (C) 2003 Peter Graves |
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4 | ;;; $Id: top-level.lisp,v 1.2 2003-09-26 19:19:14 piso Exp $ |
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5 | ;;; |
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6 | ;;; This program is free software; you can redistribute it and/or |
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7 | ;;; modify it under the terms of the GNU General Public License |
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8 | ;;; as published by the Free Software Foundation; either version 2 |
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9 | ;;; of the License, or (at your option) any later version. |
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10 | ;;; |
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11 | ;;; This program is distributed in the hope that it will be useful, |
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12 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | ;;; GNU General Public License for more details. |
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15 | ;;; |
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16 | ;;; You should have received a copy of the GNU General Public License |
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17 | ;;; along with this program; if not, write to the Free Software |
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18 | ;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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19 | |
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20 | ;;; Adapted from SB-ACLREPL (originally written by Kevin Rosenberg). |
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21 | |
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22 | (in-package "EXTENSIONS") |
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23 | |
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24 | (export '(*saved-backtrace* bt)) |
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25 | |
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26 | (defvar *saved-backtrace* nil) |
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27 | |
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28 | (defun bt (&optional count) |
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29 | (let ((count (if (fixnump count) count 7)) |
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30 | (n 0)) |
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31 | (dolist (frame *saved-backtrace*) |
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32 | (format t " ~D: ~A~%" n frame) |
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33 | (incf n) |
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34 | (when (>= n count) |
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35 | (return)))) |
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36 | (values)) |
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37 | |
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38 | (in-package "TOP-LEVEL") |
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39 | |
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40 | (defparameter *command-char* #\:) |
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41 | |
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42 | (defvar *cmd-number* 1 |
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43 | "Number of the next command") |
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44 | |
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45 | (defun prompt-package-name () |
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46 | (car (sort (append |
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47 | (package-nicknames cl:*package*) |
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48 | (list (package-name cl:*package*))) |
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49 | (lambda (a b) (< (length a) (length b)))))) |
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50 | |
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51 | (defun repl-prompt-fun (stream) |
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52 | (fresh-line stream) |
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53 | (write-string (prompt-package-name) stream) |
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54 | (write-string "(" stream) |
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55 | (princ *cmd-number* stream) |
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56 | (write-string "): " stream)) |
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57 | |
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58 | (defparameter *repl-prompt-fun* #'repl-prompt-fun) |
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59 | |
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60 | (defvar *last-files-loaded* nil) |
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61 | |
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62 | (defun peek-char-non-whitespace (stream) |
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63 | (loop |
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64 | (let ((c (read-char stream nil))) |
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65 | (unless (eql c #\Space) |
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66 | (unread-char c stream) |
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67 | (return c))))) |
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68 | |
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69 | (defun read-cmd (stream) |
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70 | (let ((c (peek-char-non-whitespace stream))) |
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71 | (if (eql c *command-char*) |
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72 | (read-line stream) |
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73 | (read stream nil)))) |
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74 | |
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75 | (defun tokenize (string) |
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76 | (do* ((res nil) |
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77 | (string (string-left-trim " " string) |
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78 | (string-left-trim " " (subseq string end))) |
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79 | (end (position #\Space string) (position #\Space string))) |
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80 | ((zerop (length string)) (nreverse res)) |
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81 | (unless end |
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82 | (setf end (length string))) |
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83 | (push (subseq string 0 end) res))) |
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84 | |
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85 | (defun process-cmd (form) |
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86 | (when (and (stringp form) (> (length form) 1) (eql (char form 0) *command-char*)) |
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87 | (let* ((pos (position #\Space form)) |
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88 | (cmd (subseq form 1 pos)) |
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89 | (args (if pos (subseq form (1+ pos)) nil))) |
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90 | (when args |
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91 | (setf args (string-trim " " args)) |
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92 | (when (zerop (length args)) |
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93 | (setf args nil))) |
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94 | (cond ((string= cmd "ld") |
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95 | (let ((files (if args (tokenize args) *last-files-loaded*))) |
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96 | (setf *last-files-loaded* files) |
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97 | (dolist (file files) |
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98 | (load file))) |
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99 | ) |
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100 | ((string= cmd "de") |
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101 | (let ((obj (eval (read-from-string args)))) |
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102 | (describe obj))) |
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103 | ((string= cmd "ap") |
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104 | (apropos args)) |
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105 | ((string= cmd "pwd") |
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106 | (format t "~A~%" *default-pathname-defaults*)) |
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107 | ((string= cmd "cd") |
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108 | (cond ((or (null args) (string= args "~")) |
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109 | (setf args (namestring (user-homedir-pathname)))) |
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110 | ((and (> (length args) 1) (string= (subseq args 0 2) "~/") |
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111 | (setf args (concatenate 'string |
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112 | (namestring (user-homedir-pathname)) |
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113 | (subseq args 2)))))) |
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114 | (let ((dir (probe-directory args))) |
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115 | (if dir |
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116 | (progn |
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117 | (setf *default-pathname-defaults* dir) |
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118 | (format *standard-output* "~A" (namestring *default-pathname-defaults*))) |
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119 | (format *standard-output* "Error: no such directory (~S).~%" args)))) |
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120 | ((string= cmd "bt") |
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121 | (let ((count (or (and args (ignore-errors (parse-integer args))) 7))) |
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122 | (bt count))) |
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123 | ((string= cmd "pa") |
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124 | (cond ((null args) |
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125 | (format *standard-output* "The ~A package is current.~%" |
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126 | (package-name *package*))) |
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127 | (t |
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128 | (when (and (plusp (length args)) (eql (char args 0) #\:)) |
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129 | (setf args (subseq args 1))) |
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130 | (setf args (nstring-upcase args)) |
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131 | (let ((pkg (find-package args))) |
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132 | (if pkg |
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133 | (setf *package* pkg) |
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134 | (format *standard-output* "Unknown package ~A.~%" args)))))) |
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135 | ((string= cmd "ex") |
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136 | (format t "Bye!~%") |
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137 | (exit)) |
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138 | (t |
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139 | (format *standard-output* "Unknown top-level command ~S.~%" cmd) |
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140 | ))) |
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141 | (return-from process-cmd t)) |
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142 | nil) |
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143 | |
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144 | (defun repl-read-form-fun (in out) |
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145 | (loop |
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146 | (let ((form (read-cmd in))) |
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147 | (setf (charpos out) 0) |
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148 | (incf *cmd-number*) |
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149 | (cond ((process-cmd form) |
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150 | (funcall *repl-prompt-fun* *standard-output*) |
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151 | (finish-output *standard-output*)) |
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152 | (t |
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153 | (return form)))))) |
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154 | |
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155 | (defparameter *repl-read-form-fun* #'repl-read-form-fun) |
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156 | |
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157 | (defun interactive-eval (form) |
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158 | (setf - form) |
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159 | (let ((results (multiple-value-list (eval form)))) |
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160 | (setf /// // |
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161 | // / |
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162 | / results |
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163 | *** ** |
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164 | ** * |
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165 | * (car results))) |
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166 | (setf +++ ++ |
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167 | ++ + |
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168 | + -) |
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169 | (values-list /)) |
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170 | |
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171 | (defun repl-fun () |
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172 | (loop |
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173 | (funcall *repl-prompt-fun* *standard-output*) |
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174 | (finish-output *standard-output*) |
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175 | (let* ((form (funcall *repl-read-form-fun* |
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176 | *standard-input* |
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177 | *standard-output*)) |
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178 | (results (multiple-value-list (interactive-eval form)))) |
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179 | (dolist (result results) |
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180 | (fresh-line) |
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181 | (prin1 result))))) |
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182 | |
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183 | (defvar *in-top-level-loop* nil) |
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184 | |
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185 | (defun top-level-loop () |
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186 | (setf *in-top-level-loop* t) |
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187 | (loop |
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188 | (catch 'top-level |
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189 | (handler-case |
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190 | (repl-fun) |
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191 | (error (c) (format t "Error: ~S.~%" c) (break) (throw 'top-level nil)))))) |
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