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1 /* |
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2 |
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3 Copyright (C) 1999, 2000, 2003, 2007 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 3 of the License, or (at your |
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10 option) any later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 #if defined (__DECCXX) |
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24 #define __USE_STD_IOSTREAM |
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25 #endif |
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26 |
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27 #include <string> |
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28 #include <iostream> |
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29 |
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30 #ifndef NPOS |
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31 #define NPOS std::string::npos |
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32 #endif |
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33 |
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34 static bool |
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35 looks_like_octave_copyright (const std::string& s) |
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36 { |
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37 // Perhaps someday we will want to do more here, so leave this as a |
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38 // separate function. |
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39 |
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40 return (s.substr (0, 9) == "Copyright"); |
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41 } |
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42 |
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43 // Eat whitespace and comments from FFILE, returning the text of the |
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44 // first block of comments that doesn't look like a copyright notice, |
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45 |
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46 static std::string |
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47 extract_help_text (void) |
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48 { |
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49 std::string help_txt; |
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50 |
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51 bool first_comments_seen = false; |
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52 bool begin_comment = false; |
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53 bool have_help_text = false; |
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54 bool in_comment = false; |
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55 bool discard_space = true; |
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56 int c; |
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57 |
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58 while ((c = std::cin.get ()) != EOF) |
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59 { |
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60 if (begin_comment) |
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61 { |
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62 if (c == '%' || c == '#') |
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63 continue; |
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64 else if (discard_space && c == ' ') |
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65 { |
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66 discard_space = false; |
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67 continue; |
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68 } |
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69 else |
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70 begin_comment = false; |
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71 } |
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72 |
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73 if (in_comment) |
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74 { |
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75 if (! have_help_text) |
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76 { |
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77 first_comments_seen = true; |
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78 help_txt += (char) c; |
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79 } |
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80 |
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81 if (c == '\n') |
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82 { |
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83 in_comment = false; |
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84 discard_space = true; |
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85 |
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86 if ((c = std::cin.get ()) != EOF) |
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87 { |
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88 if (c == '\n') |
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89 break; |
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90 } |
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91 else |
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92 break; |
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93 } |
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94 } |
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95 else |
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96 { |
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97 switch (c) |
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98 { |
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99 case ' ': |
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100 case '\t': |
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101 if (first_comments_seen) |
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102 have_help_text = true; |
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103 break; |
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104 |
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105 case '\n': |
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106 if (first_comments_seen) |
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107 have_help_text = true; |
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108 continue; |
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109 |
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110 case '%': |
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111 case '#': |
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112 begin_comment = true; |
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113 in_comment = true; |
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114 break; |
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115 |
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116 default: |
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117 goto done; |
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118 } |
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119 } |
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120 } |
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121 |
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122 done: |
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123 |
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124 if (! help_txt.empty ()) |
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125 { |
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126 if (looks_like_octave_copyright (help_txt)) |
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127 help_txt.resize (0); |
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128 |
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129 if (help_txt.empty ()) |
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130 help_txt = extract_help_text (); |
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131 } |
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132 |
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133 return help_txt; |
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134 } |
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135 |
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136 int |
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137 main (int argc, char **argv) |
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138 { |
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139 std::string name; |
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140 |
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141 if (argc != 2) |
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142 { |
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143 std::cerr << "usage: gethelp name\n"; |
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144 return 1; |
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145 } |
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146 else |
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147 name = argv[1]; |
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148 |
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149 std::string help_text = extract_help_text (); |
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150 |
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151 if (! help_text.empty ()) |
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152 { |
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153 std::cout << " " << name << "\n" << help_text; |
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154 |
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155 if (help_text[help_text.length () - 1] != '\n') |
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156 std::cout << "\n"; |
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157 } |
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158 |
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159 return 0; |
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160 } |
