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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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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 #include "readline/history.h" |
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41 |
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271
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42 extern void free_undo_list (); |
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43 |
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252
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44 extern char *xmalloc (); |
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45 |
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46 /* |
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47 * Yes, this sucks, but it avoids a conflict with another readline |
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48 * function declared in iostream.h. |
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49 */ |
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50 #if 0 |
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51 #define LINE_SIZE 8192 |
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52 static int no_line_editing = 1; |
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53 #endif |
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54 |
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55 char * |
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56 gnu_readline (char *s) |
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57 { |
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58 #if 0 |
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59 static int state = 0; |
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60 static char *line_from_stdin = (char *) NULL; |
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61 if (no_line_editing) |
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62 { |
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63 if (! state) |
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64 { |
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65 line_from_stdin = (char *) malloc (LINE_SIZE); |
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66 state = 1; |
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67 } |
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68 fputs ("octave> ", stdout); |
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69 fgets (line_from_stdin, LINE_SIZE, stdin); |
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70 return line_from_stdin; |
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71 } |
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72 else |
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73 #endif |
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74 return readline (s); |
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75 } |
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76 } |
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77 |
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78 #include "variables.h" |
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79 #include "error.h" |
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80 #include "utils.h" |
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81 #include "input.h" |
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82 #include "pager.h" |
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83 #include "help.h" |
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84 #include "octave-hist.h" |
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85 #include "sighandlers.h" |
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86 #include "parse.h" |
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87 #include "user-prefs.h" |
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88 #include "builtins.h" |
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89 |
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90 // Global pointer for eval(). |
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91 const char *current_eval_string = (char *) NULL; |
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92 |
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93 // Nonzero means get input from current_eval_string. |
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94 int get_input_from_eval_string = 0; |
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95 |
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96 // Nonzero means we're parsing an M-file. |
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97 int reading_m_file = 0; |
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98 |
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99 // Simple name of M-file we are reading. |
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100 char *curr_m_file_name = (char *) NULL; |
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101 |
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102 // Nonzero means we're parsing a script file. |
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103 int reading_script_file = 0; |
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104 |
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105 // If we are reading from an M-file, this is it. |
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106 FILE *mf_instream = (FILE *) NULL; |
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107 |
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108 // Nonzero means we are using readline. |
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109 int using_readline = 1; |
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110 |
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111 // Nonzero means commands are echoed as they are executed (-x). |
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112 int echo_input = 0; |
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113 |
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114 // Nonzero means this is an interactive shell. |
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115 int interactive = 0; |
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116 |
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117 // Nonzero means the user forced this shell to be interactive (-i). |
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118 int forced_interactive = 0; |
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119 |
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120 // Should we issue a prompt? |
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121 int promptflag = 1; |
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122 |
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123 // The current line of input, from wherever. |
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124 char *current_input_line = (char *) NULL; |
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125 |
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126 // A line of input from readline. |
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127 static char *octave_gets_line = (char *) NULL; |
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128 |
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129 /* |
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130 * Use GNU readline to get an input line and store it in the history |
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131 * list. |
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132 */ |
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287
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133 static char * |
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134 octave_gets (void) |
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135 { |
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136 if (octave_gets_line != NULL) |
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126
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137 { |
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138 free (octave_gets_line); |
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139 octave_gets_line = (char *) NULL; |
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140 } |
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141 |
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142 if (interactive || forced_interactive) |
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143 { |
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144 char *ps = (promptflag > 0) ? user_pref.ps1 : user_pref.ps2; |
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145 char *prompt = decode_prompt_string (ps); |
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146 |
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147 if (interactive) |
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148 { |
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149 pipe_handler_error_count = 0; |
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150 flush_output_to_pager (); |
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151 } |
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152 |
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153 octave_gets_line = gnu_readline (prompt); |
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154 delete [] prompt; |
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155 } |
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156 else |
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157 octave_gets_line = gnu_readline (""); |
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158 |
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159 current_input_line = octave_gets_line; |
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160 |
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161 if (octave_gets_line && *octave_gets_line) |
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162 { |
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163 maybe_save_history (octave_gets_line); |
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164 |
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165 if (echo_input) |
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166 { |
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167 if (! forced_interactive) |
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168 cout << "+ "; |
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169 |
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170 cout << octave_gets_line << "\n"; |
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171 } |
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172 } |
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173 return octave_gets_line; |
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174 } |
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175 |
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176 /* |
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177 * Read a line from the input stream. |
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178 */ |
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269
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179 int |
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180 octave_read (char *buf, int max_size) |
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181 { |
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182 int status = 0; |
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183 |
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184 static char *stashed_line = (char *) NULL; |
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185 |
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186 if (get_input_from_eval_string) |
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187 { |
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188 int len = strlen (current_eval_string); |
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189 if (len < max_size - 1) |
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190 { |
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191 strcpy (buf, current_eval_string); |
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192 buf[len++] = '\n'; |
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193 buf[len] = '\0'; // Paranoia. |
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194 status = len; |
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195 } |
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196 else |
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197 status = -1; |
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198 |
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199 if (stashed_line) |
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200 delete [] stashed_line; |
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201 |
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202 stashed_line = strsave (buf); |
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203 current_input_line = stashed_line; |
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204 } |
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205 else if (using_readline) |
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206 { |
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207 char *cp = octave_gets (); |
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208 if (cp != (char *) NULL) |
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209 { |
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210 int len = strlen (cp); |
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211 if (len >= max_size) |
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212 status = -1; |
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213 else |
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214 { |
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215 strcpy (buf, cp); |
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216 buf[len++] = '\n'; |
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217 buf[len] = '\0'; // Paranoia. |
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218 status = len; |
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219 } |
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220 } |
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221 current_input_line = cp; |
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222 } |
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223 else |
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224 { |
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225 FILE *curr_stream = rl_instream; |
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226 if (reading_m_file || reading_script_file) |
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227 curr_stream = mf_instream; |
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228 |
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229 assert (curr_stream != (FILE *) NULL); |
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230 |
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231 // Why is this required? |
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232 buf[0] = '\0'; |
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233 |
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234 if (fgets (buf, max_size, curr_stream) != (char *) NULL) |
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235 { |
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236 int len = strlen (buf); |
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237 if (len > max_size - 2) |
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238 status = -1; |
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239 else |
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240 { |
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241 if (buf[len-1] != '\n') |
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242 { |
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243 buf[len++] = '\n'; |
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244 buf[len] = '\0'; |
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245 } |
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246 status = len; |
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247 } |
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248 } |
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249 else |
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250 status = 0; // Tell yylex that we found EOF. |
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251 |
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252 if (stashed_line) |
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253 delete [] stashed_line; |
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254 |
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255 stashed_line = strsave (buf); |
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256 current_input_line = stashed_line; |
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257 |
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258 if (echo_input && current_input_line && *current_input_line) |
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259 { |
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260 if (! forced_interactive) |
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261 cout << "+ "; |
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262 |
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263 cout << current_input_line << "\n"; |
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264 } |
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265 } |
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266 input_line_number++; |
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267 return status; |
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268 } |
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269 |
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270 /* |
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271 * Fix things up so that input can come from file `name', printing a |
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272 * warning if the file doesn't exist. |
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273 */ |
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274 FILE * |
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275 get_input_from_file (char *name, int warn = 1) |
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276 { |
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277 FILE *instream = (FILE *) NULL; |
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278 |
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279 if (name && *name) |
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280 instream = fopen (name, "r"); |
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281 |
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282 if (instream == (FILE *) NULL && warn) |
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283 warning ("%s: no such file or directory", name); |
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284 |
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285 if (reading_m_file || reading_script_file) |
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286 mf_instream = instream; |
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287 else |
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288 rl_instream = instream; |
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289 |
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290 return instream; |
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291 } |
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292 |
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293 /* |
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294 * Fix things up so that input can come from the standard input. This |
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295 * may need to become much more complicated, which is why it's in a |
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296 * separate function. |
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297 */ |
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298 FILE * |
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299 get_input_from_stdin (void) |
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300 { |
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301 rl_instream = stdin; |
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302 return rl_instream; |
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303 } |
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304 |
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305 static char * |
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306 command_generator (char *text, int state) |
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307 { |
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308 static int len = 0; |
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309 static int list_index = 0; |
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310 |
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311 static char **name_list = (char **) NULL; |
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312 |
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313 if (state == 0) |
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314 { |
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315 list_index = 0; |
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316 len = strlen (text); |
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317 |
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318 if (name_list != (char **) NULL) |
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244
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319 { |
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320 char **ptr = name_list; |
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321 while (ptr && *ptr) |
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322 delete [] *ptr++; |
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323 delete [] name_list; |
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324 } |
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325 |
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326 name_list = make_name_list (); |
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327 } |
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328 |
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329 char *name; |
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330 while ((name = name_list[list_index]) != (char *) NULL) |
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331 { |
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332 list_index++; |
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333 if (strncmp (name, text, len) == 0) |
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244
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334 { |
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335 char *buf = xmalloc (1 + strlen (name)); |
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336 strcpy (buf, name); |
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337 return buf; |
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338 } |
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339 } |
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340 |
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341 return (char *) NULL; |
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342 } |
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343 |
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344 static char ** |
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345 command_completer (char *text, int start, int end) |
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346 { |
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347 char **matches = (char **) NULL; |
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348 matches = completion_matches (text, command_generator); |
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349 return matches; |
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350 } |
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351 |
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269
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352 /* |
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353 * The next two functions implement the equivalent of the K*rn shell |
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354 * C-o operate-and-get-next-history-line editing command. Stolen from |
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355 * the GNU Bourne Again SHell. |
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356 */ |
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357 |
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358 // ?? |
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359 static int saved_history_line_to_use = 0; |
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360 |
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361 // ?? |
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362 static Function *old_rl_startup_hook = (Function *) NULL; |
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363 |
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364 static void |
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365 set_saved_history (void) |
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366 { |
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367 HIST_ENTRY *h; |
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368 |
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369 if (saved_history_line_to_use) |
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370 { |
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371 if (history_set_pos (saved_history_line_to_use)) |
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372 { |
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373 h = current_history (); |
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374 if (h) |
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375 { |
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376 rl_insert_text (h->line); |
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377 |
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378 // Get rid of any undo list created by the previous insert, so the |
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379 // line won't totally be erased when the edits are undone (they will |
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380 // be normally, because this is a history line -- cf. readline.c: |
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381 // line 380 or so). |
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382 if (rl_undo_list) |
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383 { |
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384 free_undo_list (); |
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385 rl_undo_list = (UNDO_LIST *) NULL; |
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386 } |
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387 } |
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388 } |
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389 } |
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390 saved_history_line_to_use = 0; |
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391 rl_startup_hook = old_rl_startup_hook; |
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392 } |
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393 |
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394 static void |
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395 operate_and_get_next (int count, int c) |
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396 { |
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397 int where; |
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398 extern int history_stifled, history_length, max_input_history; |
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399 |
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400 /* Accept the current line. */ |
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401 rl_newline (); |
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402 |
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403 /* Find the current line, and find the next line to use. */ |
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404 where = where_history (); |
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405 |
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406 if (history_stifled && (history_length >= max_input_history)) |
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407 saved_history_line_to_use = where; |
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408 else |
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409 saved_history_line_to_use = where + 1; |
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410 |
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411 old_rl_startup_hook = rl_startup_hook; |
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412 rl_startup_hook = (Function *) set_saved_history; |
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413 } |
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414 |
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415 void |
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416 initialize_readline (void) |
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417 { |
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418 // Allow conditional parsing of the ~/.inputrc file |
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419 rl_readline_name = "Octave"; |
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420 |
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421 // Tell the completer that we want to try first. |
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271
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422 rl_attempted_completion_function = (CPPFunction *) command_completer; |
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423 |
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424 // Bind operate-and-get-next. |
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425 rl_add_defun ("operate-and-get-next", |
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426 (Function *) operate_and_get_next, CTRL ('O')); |
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1
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427 } |
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428 |
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429 /* |
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430 ;;; Local Variables: *** |
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431 ;;; mode: C++ *** |
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432 ;;; page-delimiter: "^/\\*" *** |
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433 ;;; End: *** |
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434 */ |
