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1 #include <string> |
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2 #include <iostream> |
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3 |
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4 #ifndef NPOS |
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5 #define NPOS std::string::npos |
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6 #endif |
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7 |
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8 static bool |
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9 looks_like_octave_copyright (const std::string& s) |
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10 { |
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11 bool retval = false; |
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12 |
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13 std::string t = s.substr (0, 14); |
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14 |
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15 if (t == "Copyright (C) ") |
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16 { |
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17 size_t pos = s.find ('\n'); |
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18 |
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19 if (pos != NPOS) |
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20 { |
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21 pos = s.find ('\n', pos + 1); |
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22 |
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23 if (pos != NPOS) |
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24 { |
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25 pos++; |
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26 |
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27 t = s.substr (pos, 28); |
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28 |
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29 if (t == "This file is part of Octave." |
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30 || t == "This program is free softwar") |
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31 retval = true; |
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32 } |
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33 } |
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34 } |
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35 |
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36 return retval; |
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37 } |
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38 |
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39 // Eat whitespace and comments from FFILE, returning the text of the |
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40 // first block of comments that doesn't look like a copyright notice, |
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41 |
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42 static std::string |
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43 extract_help_text (void) |
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44 { |
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45 std::string help_txt; |
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46 |
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47 bool first_comments_seen = false; |
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48 bool begin_comment = false; |
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49 bool have_help_text = false; |
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50 bool in_comment = false; |
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51 bool discard_space = true; |
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52 int c; |
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53 |
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54 while ((c = std::cin.get ()) != EOF) |
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55 { |
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56 if (begin_comment) |
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57 { |
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58 if (c == '%' || c == '#') |
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59 continue; |
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60 else if (discard_space && c == ' ') |
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61 { |
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62 discard_space = false; |
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63 continue; |
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64 } |
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65 else |
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66 begin_comment = false; |
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67 } |
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68 |
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69 if (in_comment) |
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70 { |
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71 if (! have_help_text) |
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72 { |
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73 first_comments_seen = true; |
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74 help_txt += (char) c; |
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75 } |
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76 |
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77 if (c == '\n') |
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78 { |
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79 in_comment = false; |
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80 discard_space = true; |
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81 |
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82 if ((c = std::cin.get ()) != EOF) |
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83 { |
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84 if (c == '\n') |
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85 break; |
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86 } |
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87 else |
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88 break; |
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89 } |
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90 } |
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91 else |
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92 { |
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93 switch (c) |
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94 { |
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95 case ' ': |
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96 case '\t': |
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97 if (first_comments_seen) |
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98 have_help_text = true; |
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99 break; |
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100 |
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101 case '\n': |
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102 if (first_comments_seen) |
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103 have_help_text = true; |
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104 continue; |
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105 |
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106 case '%': |
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107 case '#': |
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108 begin_comment = true; |
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109 in_comment = true; |
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110 break; |
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111 |
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112 default: |
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113 goto done; |
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114 } |
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115 } |
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116 } |
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117 |
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118 done: |
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119 |
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120 if (! help_txt.empty ()) |
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121 { |
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122 if (looks_like_octave_copyright (help_txt)) |
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123 help_txt.resize (0); |
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124 |
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125 if (help_txt.empty ()) |
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126 help_txt = extract_help_text (); |
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127 } |
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128 |
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129 return help_txt; |
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130 } |
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131 |
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132 int |
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133 main (int argc, char **argv) |
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134 { |
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135 std::string name; |
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136 |
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137 if (argc != 2) |
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138 { |
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139 std::cerr << "usage: gethelp name\n"; |
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140 return 1; |
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141 } |
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142 else |
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143 name = argv[1]; |
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144 |
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145 std::string help_text = extract_help_text (); |
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146 |
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147 if (! help_text.empty ()) |
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148 { |
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149 std::cout << " " << name << "\n" << help_text; |
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150 |
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151 if (help_text[help_text.length () - 1] != '\n') |
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152 std::cout << "\n"; |
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153 } |
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154 |
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155 return 0; |
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156 } |
