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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, 1994 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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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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269
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40 #include "readline/history.h" |
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41 |
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252
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42 extern char *xmalloc (); |
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43 |
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44 /* |
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45 * Yes, this sucks, but it avoids a conflict with another readline |
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46 * function declared in iostream.h. |
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47 */ |
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48 #if 0 |
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49 #define LINE_SIZE 8192 |
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50 static int no_line_editing = 1; |
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51 #endif |
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52 |
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53 char * |
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54 gnu_readline (char *s) |
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55 { |
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56 #if 0 |
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57 static int state = 0; |
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58 static char *line_from_stdin = (char *) NULL; |
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59 if (no_line_editing) |
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60 { |
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61 if (! state) |
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62 { |
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63 line_from_stdin = (char *) malloc (LINE_SIZE); |
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64 state = 1; |
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65 } |
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66 fputs ("octave> ", stdout); |
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67 fgets (line_from_stdin, LINE_SIZE, stdin); |
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68 return line_from_stdin; |
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69 } |
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70 else |
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71 #endif |
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72 return readline (s); |
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73 } |
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74 } |
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75 |
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76 #include "variables.h" |
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77 #include "error.h" |
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78 #include "utils.h" |
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79 #include "input.h" |
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80 #include "pager.h" |
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81 #include "help.h" |
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82 #include "octave-hist.h" |
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83 #include "sighandlers.h" |
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84 #include "parse.h" |
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85 #include "user-prefs.h" |
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86 #include "builtins.h" |
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87 |
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88 // Global pointer for eval(). |
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164
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89 const char *current_eval_string = (char *) NULL; |
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90 |
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91 // Nonzero means get input from current_eval_string. |
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92 int get_input_from_eval_string = 0; |
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93 |
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94 // Nonzero means we're parsing an M-file. |
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95 int reading_m_file = 0; |
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96 |
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97 // Simple name of M-file we are reading. |
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98 char *curr_m_file_name = (char *) NULL; |
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99 |
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100 // Nonzero means we're parsing a script file. |
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101 int reading_script_file = 0; |
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102 |
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103 // If we are reading from an M-file, this is it. |
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104 FILE *mf_instream = (FILE *) NULL; |
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105 |
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106 // Nonzero means we are using readline. |
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107 int using_readline = 1; |
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108 |
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109 // Nonzero means commands are echoed as they are executed (-x). |
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110 int echo_input = 0; |
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111 |
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112 // Nonzero means this is an interactive shell. |
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113 int interactive = 0; |
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114 |
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115 // Nonzero means the user forced this shell to be interactive (-i). |
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116 int forced_interactive = 0; |
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117 |
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118 // Should we issue a prompt? |
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119 int promptflag = 1; |
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120 |
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121 // The current line of input, from wherever. |
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122 char *current_input_line = (char *) NULL; |
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123 |
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124 // A line of input from readline. |
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125 static char *octave_gets_line = (char *) NULL; |
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126 |
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127 /* |
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128 * Use GNU readline to get an input line and store it in the history |
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129 * list. |
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130 */ |
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131 char * |
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132 octave_gets (void) |
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133 { |
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134 if (octave_gets_line != NULL) |
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126
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135 { |
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136 free (octave_gets_line); |
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137 octave_gets_line = (char *) NULL; |
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138 } |
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139 |
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140 if (interactive || forced_interactive) |
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141 { |
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142 char *ps = (promptflag > 0) ? user_pref.ps1 : user_pref.ps2; |
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143 char *prompt = decode_prompt_string (ps); |
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144 |
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145 if (interactive) |
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146 { |
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147 pipe_handler_error_count = 0; |
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148 flush_output_to_pager (); |
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149 } |
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150 |
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151 octave_gets_line = gnu_readline (prompt); |
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152 delete [] prompt; |
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153 } |
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154 else |
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155 octave_gets_line = gnu_readline (""); |
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156 |
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157 current_input_line = octave_gets_line; |
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158 |
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159 if (octave_gets_line && *octave_gets_line) |
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160 { |
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161 maybe_save_history (octave_gets_line); |
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162 |
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163 if (echo_input) |
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164 { |
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165 if (!forced_interactive) |
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166 cout << "+ "; |
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167 if (octave_gets_line != (char *) NULL) |
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168 cout << octave_gets_line << "\n"; |
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169 } |
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170 } |
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171 return octave_gets_line; |
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172 } |
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173 |
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174 /* |
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175 * Read a line from the input stream. |
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176 */ |
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269
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177 int |
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178 octave_read (char *buf, int max_size) |
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179 { |
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180 int status = 0; |
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181 |
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182 static char *stashed_line = (char *) NULL; |
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183 |
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184 if (get_input_from_eval_string) |
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185 { |
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186 int len = strlen (current_eval_string); |
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187 if (len < max_size - 1) |
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188 { |
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189 strcpy (buf, current_eval_string); |
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190 buf[len++] = '\n'; |
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191 buf[len] = '\0'; // Paranoia. |
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192 status = len; |
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193 } |
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194 else |
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195 status = -1; |
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196 |
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197 if (stashed_line) |
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198 delete [] stashed_line; |
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199 |
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200 stashed_line = strsave (buf); |
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201 current_input_line = stashed_line; |
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202 } |
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203 else if (using_readline) |
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204 { |
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205 char *cp = octave_gets (); |
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206 if (cp != (char *) NULL) |
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207 { |
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208 int len = strlen (cp); |
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209 if (len >= max_size) |
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210 status = -1; |
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211 else |
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212 { |
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213 strcpy (buf, cp); |
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214 buf[len++] = '\n'; |
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215 buf[len] = '\0'; // Paranoia. |
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216 status = len; |
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217 } |
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218 } |
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219 current_input_line = cp; |
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220 } |
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221 else |
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222 { |
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223 FILE *curr_stream = rl_instream; |
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224 if (reading_m_file || reading_script_file) |
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225 curr_stream = mf_instream; |
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226 |
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227 assert (curr_stream != (FILE *) NULL); |
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228 |
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229 // Why is this required? |
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230 buf[0] = '\0'; |
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231 |
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232 if (fgets (buf, max_size, curr_stream) != (char *) NULL) |
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233 { |
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234 int len = strlen (buf); |
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235 if (len > max_size - 2) |
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236 status = -1; |
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237 else |
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238 { |
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239 if (buf[len-1] != '\n') |
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240 { |
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241 buf[len++] = '\n'; |
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242 buf[len] = '\0'; |
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243 } |
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244 status = len; |
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245 } |
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246 } |
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247 else |
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248 status = 0; // Tell yylex that we found EOF. |
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249 |
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250 if (stashed_line) |
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251 delete [] stashed_line; |
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252 |
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253 stashed_line = strsave (buf); |
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254 current_input_line = stashed_line; |
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255 } |
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256 input_line_number++; |
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257 return status; |
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258 } |
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259 |
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260 /* |
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261 * Fix things up so that input can come from file `name', printing a |
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262 * warning if the file doesn't exist. |
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263 */ |
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264 FILE * |
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265 get_input_from_file (char *name, int warn = 1) |
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266 { |
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267 FILE *instream = (FILE *) NULL; |
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268 |
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269 if (name && *name) |
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270 instream = fopen (name, "r"); |
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271 |
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272 if (instream == (FILE *) NULL && warn) |
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273 warning ("%s: no such file or directory", name); |
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274 |
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275 if (reading_m_file || reading_script_file) |
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276 mf_instream = instream; |
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277 else |
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278 rl_instream = instream; |
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279 |
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280 return instream; |
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281 } |
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282 |
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283 /* |
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284 * Fix things up so that input can come from the standard input. This |
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285 * may need to become much more complicated, which is why it's in a |
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286 * separate function. |
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287 */ |
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288 FILE * |
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289 get_input_from_stdin (void) |
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290 { |
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291 rl_instream = stdin; |
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292 return rl_instream; |
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293 } |
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294 |
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295 static char * |
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296 command_generator (char *text, int state) |
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297 { |
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298 static int len = 0; |
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299 static int list_index = 0; |
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300 |
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301 static char **name_list = (char **) NULL; |
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302 |
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303 if (state == 0) |
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304 { |
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305 list_index = 0; |
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306 len = strlen (text); |
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307 |
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308 if (name_list != (char **) NULL) |
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244
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309 { |
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310 char **ptr = name_list; |
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311 while (ptr && *ptr) |
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312 delete [] *ptr++; |
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313 delete [] name_list; |
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314 } |
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315 |
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316 name_list = make_name_list (); |
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317 } |
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318 |
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319 char *name; |
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320 while ((name = name_list[list_index]) != (char *) NULL) |
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321 { |
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322 list_index++; |
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323 if (strncmp (name, text, len) == 0) |
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244
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324 { |
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325 char *buf = xmalloc (1 + strlen (name)); |
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326 strcpy (buf, name); |
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327 return buf; |
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328 } |
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329 } |
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330 |
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331 return (char *) NULL; |
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332 } |
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333 |
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334 static char ** |
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335 command_completer (char *text, int start, int end) |
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336 { |
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337 char **matches = (char **) NULL; |
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338 matches = completion_matches (text, command_generator); |
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339 return matches; |
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340 } |
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341 |
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342 /* |
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343 * The next two functions implement the equivalent of the K*rn shell |
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344 * C-o operate-and-get-next-history-line editing command. Stolen from |
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345 * the GNU Bourne Again SHell. |
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346 */ |
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347 |
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348 // ?? |
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349 static int saved_history_line_to_use = 0; |
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350 |
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351 // ?? |
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352 static Function *old_rl_startup_hook = (Function *) NULL; |
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353 |
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354 static void |
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355 set_saved_history (void) |
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356 { |
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357 HIST_ENTRY *h; |
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358 |
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359 if (saved_history_line_to_use) |
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360 { |
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361 if (history_set_pos (saved_history_line_to_use)) |
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362 { |
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363 h = current_history (); |
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364 if (h) |
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365 { |
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366 rl_insert_text (h->line); |
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367 |
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368 // Get rid of any undo list created by the previous insert, so the |
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369 // line won't totally be erased when the edits are undone (they will |
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370 // be normally, because this is a history line -- cf. readline.c: |
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371 // line 380 or so). |
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372 if (rl_undo_list) |
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373 { |
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374 free_undo_list (); |
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375 rl_undo_list = (UNDO_LIST *) NULL; |
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376 } |
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377 } |
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378 } |
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379 } |
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380 saved_history_line_to_use = 0; |
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381 rl_startup_hook = old_rl_startup_hook; |
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382 } |
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383 |
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384 static void |
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385 operate_and_get_next (int count, int c) |
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386 { |
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387 int where; |
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388 extern int history_stifled, history_length, max_input_history; |
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389 |
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390 /* Accept the current line. */ |
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391 rl_newline (); |
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392 |
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393 /* Find the current line, and find the next line to use. */ |
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394 where = where_history (); |
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395 |
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396 if (history_stifled && (history_length >= max_input_history)) |
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397 saved_history_line_to_use = where; |
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398 else |
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399 saved_history_line_to_use = where + 1; |
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400 |
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401 old_rl_startup_hook = rl_startup_hook; |
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402 rl_startup_hook = (Function *) set_saved_history; |
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403 } |
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404 |
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405 void |
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406 initialize_readline (void) |
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407 { |
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408 // Allow conditional parsing of the ~/.inputrc file |
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409 rl_readline_name = "Octave"; |
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410 |
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411 // Tell the completer that we want to try first. |
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412 rl_attempted_completion_function = (Function *) command_completer; |
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413 |
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414 // Bind operate-and-get-next. |
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415 rl_add_defun ("operate-and-get-next", |
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416 (Function *) operate_and_get_next, CTRL ('O')); |
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417 } |
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418 |
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419 /* |
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420 ;;; Local Variables: *** |
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421 ;;; mode: C++ *** |
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422 ;;; page-delimiter: "^/\\*" *** |
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423 ;;; End: *** |
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424 */ |
