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1 // input.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 // Use the GNU readline library for command line editing and hisory. |
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25 |
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240
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26 #ifdef HAVE_CONFIG_H |
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27 #include "config.h" |
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28 #endif |
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29 |
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30 #include <stdio.h> |
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31 #include <stdlib.h> |
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195
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32 #include <iostream.h> |
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188
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33 #include <string.h> |
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34 #include <assert.h> |
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35 |
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36 // This must come before anything that includes iostream.h... |
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37 extern "C" |
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38 { |
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39 #include "readline/readline.h" |
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40 |
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41 /* |
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42 * Yes, this sucks, but it avoids a conflict with another readline |
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43 * function declared in iostream.h. |
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44 */ |
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45 #if 0 |
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46 #define LINE_SIZE 8192 |
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47 static int no_line_editing = 1; |
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48 #endif |
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49 |
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50 char * |
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51 gnu_readline (char *s) |
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52 { |
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53 #if 0 |
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54 static int state = 0; |
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55 static char *line_from_stdin = (char *) NULL; |
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56 if (no_line_editing) |
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57 { |
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58 if (! state) |
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59 { |
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60 line_from_stdin = (char *) malloc (LINE_SIZE); |
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61 state = 1; |
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62 } |
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63 fputs ("octave> ", stdout); |
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64 fgets (line_from_stdin, LINE_SIZE, stdin); |
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65 return line_from_stdin; |
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66 } |
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67 else |
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68 #endif |
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69 return readline (s); |
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70 } |
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71 } |
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72 |
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73 #include "variables.h" |
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74 #include "error.h" |
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75 #include "utils.h" |
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76 #include "input.h" |
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77 #include "pager.h" |
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78 #include "help.h" |
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79 #include "octave-hist.h" |
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80 #include "sighandlers.h" |
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81 #include "parse.h" |
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82 #include "user-prefs.h" |
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83 #include "builtins.h" |
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84 |
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85 // Global pointer for eval(). |
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164
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86 const char *current_eval_string = (char *) NULL; |
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87 |
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88 // Nonzero means get input from current_eval_string. |
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89 int get_input_from_eval_string = 0; |
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90 |
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91 // Nonzero means we're parsing an M-file. |
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92 int reading_m_file = 0; |
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93 |
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94 // Simple name of M-file we are reading. |
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95 char *curr_m_file_name = (char *) NULL; |
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96 |
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97 // Nonzero means we're parsing a script file. |
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98 int reading_script_file = 0; |
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99 |
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100 // If we are reading from an M-file, this is it. |
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101 FILE *mf_instream = (FILE *) NULL; |
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102 |
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103 // Nonzero means we are using readline. |
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104 int using_readline = 1; |
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105 |
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106 // Nonzero means commands are echoed as they are executed (-x). |
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107 int echo_input = 0; |
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108 |
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109 // Nonzero means this is an interactive shell. |
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110 int interactive = 0; |
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111 |
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112 // Nonzero means the user forced this shell to be interactive (-i). |
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113 int forced_interactive = 0; |
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114 |
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115 // Should we issue a prompt? |
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116 int promptflag = 1; |
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117 |
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118 // The current line of input, from wherever. |
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119 char *current_input_line = (char *) NULL; |
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120 |
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121 // A line of input from readline. |
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122 static char *octave_gets_line = (char *) NULL; |
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123 |
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124 /* |
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125 * Use GNU readline to get an input line and store it in the history |
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126 * list. |
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127 */ |
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128 char * |
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129 octave_gets (void) |
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130 { |
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131 if (octave_gets_line != NULL) |
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126
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132 { |
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133 free (octave_gets_line); |
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134 octave_gets_line = (char *) NULL; |
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135 } |
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136 |
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137 if (interactive || forced_interactive) |
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138 { |
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139 char *ps = (promptflag > 0) ? user_pref.ps1 : user_pref.ps2; |
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140 char *prompt = decode_prompt_string (ps); |
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141 |
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142 if (interactive) |
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143 { |
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144 pipe_handler_error_count = 0; |
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145 flush_output_to_pager (); |
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146 } |
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147 |
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148 octave_gets_line = gnu_readline (prompt); |
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149 delete [] prompt; |
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150 } |
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151 else |
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152 octave_gets_line = gnu_readline (""); |
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153 |
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154 current_input_line = octave_gets_line; |
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155 |
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156 if (octave_gets_line && *octave_gets_line) |
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157 { |
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158 maybe_save_history (octave_gets_line); |
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159 |
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160 if (echo_input) |
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161 { |
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162 if (!forced_interactive) |
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163 cout << "+ "; |
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164 if (octave_gets_line != (char *) NULL) |
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165 cout << octave_gets_line << "\n"; |
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166 } |
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167 } |
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168 return octave_gets_line; |
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169 } |
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170 |
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171 /* |
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172 * Read a line from the input stream. |
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173 */ |
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174 int |
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175 octave_read (char *buf, int max_size) |
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176 { |
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177 int status = 0; |
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178 |
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179 static char *stashed_line = (char *) NULL; |
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180 |
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181 if (get_input_from_eval_string) |
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182 { |
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183 int len = strlen (current_eval_string); |
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184 if (len < max_size - 1) |
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185 { |
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186 strcpy (buf, current_eval_string); |
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187 buf[len++] = '\n'; |
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188 buf[len] = '\0'; // Paranoia. |
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189 status = len; |
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190 } |
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191 else |
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192 status = -1; |
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193 |
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194 if (stashed_line) |
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195 delete [] stashed_line; |
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196 |
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197 stashed_line = strsave (buf); |
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198 current_input_line = stashed_line; |
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199 } |
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200 else if (using_readline) |
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201 { |
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202 char *cp = octave_gets (); |
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203 if (cp != (char *) NULL) |
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204 { |
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205 int len = strlen (cp); |
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206 if (len >= max_size) |
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207 status = -1; |
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208 else |
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209 { |
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210 strcpy (buf, cp); |
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211 buf[len++] = '\n'; |
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212 buf[len] = '\0'; // Paranoia. |
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213 status = len; |
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214 } |
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215 } |
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216 current_input_line = cp; |
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217 } |
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218 else |
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219 { |
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220 FILE *curr_stream = rl_instream; |
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221 if (reading_m_file || reading_script_file) |
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222 curr_stream = mf_instream; |
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223 |
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224 assert (curr_stream != (FILE *) NULL); |
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225 |
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226 // Why is this required? |
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227 buf[0] = '\0'; |
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228 |
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229 if (fgets (buf, max_size, curr_stream) != (char *) NULL) |
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230 { |
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231 int len = strlen (buf); |
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232 if (len > max_size - 2) |
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233 status = -1; |
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234 else |
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235 { |
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236 if (buf[len-1] != '\n') |
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237 { |
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238 buf[len++] = '\n'; |
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239 buf[len] = '\0'; |
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240 } |
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241 status = len; |
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242 } |
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243 } |
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244 else |
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245 status = 0; // Tell yylex that we found EOF. |
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246 |
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247 if (stashed_line) |
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248 delete [] stashed_line; |
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249 |
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250 stashed_line = strsave (buf); |
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251 current_input_line = stashed_line; |
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252 } |
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253 input_line_number++; |
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254 return status; |
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255 } |
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256 |
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257 /* |
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258 * Fix things up so that input can come from file `name', printing a |
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259 * warning if the file doesn't exist. |
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260 */ |
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261 FILE * |
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262 get_input_from_file (char *name, int warn = 1) |
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263 { |
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264 FILE *instream = (FILE *) NULL; |
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265 |
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266 if (name && *name) |
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267 instream = fopen (name, "r"); |
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268 |
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269 if (instream == (FILE *) NULL && warn) |
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270 warning ("%s: no such file or directory", name); |
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271 |
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272 if (reading_m_file || reading_script_file) |
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273 mf_instream = instream; |
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274 else |
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275 rl_instream = instream; |
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276 |
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277 return instream; |
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278 } |
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279 |
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280 /* |
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281 * Fix things up so that input can come from the standard input. This |
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282 * may need to become much more complicated, which is why it's in a |
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283 * separate function. |
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284 */ |
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285 FILE * |
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286 get_input_from_stdin (void) |
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287 { |
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288 rl_instream = stdin; |
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289 return rl_instream; |
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290 } |
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291 |
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292 char * |
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293 command_generator (char *text, int state) |
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294 { |
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295 static int len = 0; |
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296 static int list_index = 0; |
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297 |
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298 static char **name_list = (char **) NULL; |
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299 |
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300 if (state == 0) |
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301 { |
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302 list_index = 0; |
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303 len = strlen (text); |
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304 |
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305 if (name_list != (char **) NULL) |
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244
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306 { |
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307 char **ptr = name_list; |
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308 while (ptr && *ptr) |
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309 delete [] *ptr++; |
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310 delete [] name_list; |
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311 } |
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312 |
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313 name_list = make_name_list (); |
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314 } |
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315 |
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316 char *name; |
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317 while ((name = name_list[list_index]) != (char *) NULL) |
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318 { |
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319 list_index++; |
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320 if (strncmp (name, text, len) == 0) |
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244
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321 { |
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322 char *buf = xmalloc (1 + strlen (name)); |
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323 strcpy (buf, name); |
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324 return buf; |
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325 } |
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326 } |
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327 |
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328 return (char *) NULL; |
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329 } |
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330 |
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331 char ** |
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332 command_completer (char *text, int start, int end) |
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333 { |
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334 char **matches = (char **) NULL; |
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335 matches = completion_matches (text, command_generator); |
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336 return matches; |
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337 } |
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338 |
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339 void |
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340 initialize_readline (void) |
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341 { |
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342 // Allow conditional parsing of the ~/.inputrc file |
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343 rl_readline_name = "Octave"; |
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344 |
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345 // Tell the completer that we want to try first. |
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346 rl_attempted_completion_function = (Function *) command_completer; |
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347 } |
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348 |
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349 /* |
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350 ;;; Local Variables: *** |
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351 ;;; mode: C++ *** |
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352 ;;; page-delimiter: "^/\\*" *** |
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353 ;;; End: *** |
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354 */ |
