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