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171
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1 /* infohelp.c -- Functions which build documentation nodes. */ |
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2 |
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3 /* This file is part of GNU Info, a program for reading online documentation |
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4 stored in Info format. |
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5 |
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6 Copyright (C) 1993 Free Software Foundation, Inc. |
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7 |
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8 This program is free software; you can redistribute it and/or modify |
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9 it under the terms of the GNU General Public License as published by |
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10 the Free Software Foundation; either version 2, or (at your option) |
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11 any later version. |
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12 |
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13 This program is distributed in the hope that it will be useful, |
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 GNU General Public License 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 this program; if not, write to the Free Software |
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20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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171
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21 |
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22 Written by Brian Fox (bfox@ai.mit.edu). */ |
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23 |
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1242
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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171
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28 #include "info.h" |
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29 |
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30 /* **************************************************************** */ |
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31 /* */ |
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32 /* Info Help Windows */ |
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33 /* */ |
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34 /* **************************************************************** */ |
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35 |
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36 /* The name of the node used in the help window. */ |
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37 static char *info_help_nodename = "*Info Help*"; |
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38 |
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39 /* A node containing printed key bindings and their documentation. */ |
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40 static NODE *internal_info_help_node = (NODE *)NULL; |
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41 |
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42 /* The static text which appears in the internal info help node. */ |
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43 static char *info_internal_help_text[] = { |
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44 "Basic Commands in Info Windows", |
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45 "******************************", |
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46 "", |
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47 " h Invoke the Info tutorial.", |
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48 "", |
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49 "Selecting other nodes:", |
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50 "----------------------", |
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51 " n Move to the \"next\" node of this node.", |
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52 " p Move to the \"previous\" node of this node.", |
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53 " u Move \"up\" from this node.", |
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54 " m Pick menu item specified by name.", |
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55 " Picking a menu item causes another node to be selected.", |
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56 " f Follow a cross reference. Reads name of reference.", |
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57 " l Move to the last node seen in this window.", |
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58 " d Move to the `directory' node. Equivalent to `g(DIR)'.", |
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59 "", |
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60 "Moving within a node:", |
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61 "---------------------", |
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62 " SPC Scroll forward a page.", |
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63 " DEL Scroll backward a page.", |
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64 " b Go to the beginning of this node.", |
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65 " e Go to the end of this node.", |
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66 "", |
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67 "\"Advanced\" commands:", |
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68 "--------------------", |
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69 " q Quit Info.", |
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70 " 1 Pick first item in node's menu.", |
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71 " 2-9 Pick second ... ninth item in node's menu.", |
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72 " 0 Pick last item in node's menu.", |
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73 " g Move to node specified by name.", |
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74 " You may include a filename as well, as in (FILENAME)NODENAME.", |
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75 " s Search through this Info file for a specified string,", |
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76 " and select the node in which the next occurrence is found.", |
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77 (char *)NULL |
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78 }; |
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79 |
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80 void |
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81 dump_map_to_message_buffer (prefix, map) |
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82 char *prefix; |
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83 Keymap map; |
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84 { |
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85 register int i; |
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86 |
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87 for (i = 0; i < 256; i++) |
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88 { |
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89 if (map[i].type == ISKMAP) |
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90 { |
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91 char *new_prefix, *keyname; |
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92 |
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93 keyname = pretty_keyname (i); |
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94 new_prefix = (char *) |
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95 xmalloc (3 + strlen (prefix) + strlen (keyname)); |
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96 sprintf (new_prefix, "%s%s%s ", prefix, *prefix ? " " : "", keyname); |
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97 |
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98 dump_map_to_message_buffer (new_prefix, (Keymap)map[i].function); |
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99 free (new_prefix); |
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100 } |
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101 else if (map[i].function) |
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102 { |
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103 register int last; |
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104 char *doc, *name; |
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105 |
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106 doc = function_documentation (map[i].function); |
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107 name = function_name (map[i].function); |
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108 |
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109 if (!*doc) |
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110 continue; |
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111 |
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112 /* Find out if there is a series of identical functions, as in |
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113 ea_insert (). */ |
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114 for (last = i + 1; last < 256; last++) |
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115 if ((map[last].type != ISFUNC) || |
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116 (map[last].function != map[i].function)) |
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117 break; |
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118 |
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119 if (last - 1 != i) |
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120 { |
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121 printf_to_message_buffer |
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122 ("%s%s .. ", prefix, pretty_keyname (i)); |
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123 printf_to_message_buffer |
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124 ("%s%s\t", prefix, pretty_keyname (last - 1)); |
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125 i = last - 1; |
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126 } |
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127 else |
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128 printf_to_message_buffer ("%s%s\t", prefix, pretty_keyname (i)); |
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129 |
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130 #if defined (NAMED_FUNCTIONS) |
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131 /* Print the name of the function, and some padding before the |
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132 documentation string is printed. */ |
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133 { |
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134 int length_so_far; |
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135 int desired_doc_start = 40; /* Must be multiple of 8. */ |
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136 |
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137 printf_to_message_buffer ("(%s)", name); |
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138 length_so_far = message_buffer_length_this_line (); |
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139 |
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140 if ((desired_doc_start + strlen (doc)) >= the_screen->width) |
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141 printf_to_message_buffer ("\n "); |
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142 else |
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143 { |
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144 while (length_so_far < desired_doc_start) |
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145 { |
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146 printf_to_message_buffer ("\t"); |
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147 length_so_far += character_width ('\t', length_so_far); |
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148 } |
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149 } |
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150 } |
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151 #endif /* NAMED_FUNCTIONS */ |
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152 printf_to_message_buffer ("%s\n", doc); |
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153 } |
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154 } |
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155 } |
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156 |
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157 /* How to create internal_info_help_node. */ |
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158 static void |
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159 create_internal_info_help_node () |
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160 { |
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161 register int i; |
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162 |
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163 initialize_message_buffer (); |
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164 |
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165 for (i = 0; info_internal_help_text[i]; i++) |
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166 printf_to_message_buffer ("%s\n", info_internal_help_text[i]); |
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167 |
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168 printf_to_message_buffer ("---------------------\n\n"); |
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169 printf_to_message_buffer ("The current search path is:\n"); |
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170 printf_to_message_buffer (" \"%s\"\n", infopath); |
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171 printf_to_message_buffer ("---------------------\n\n"); |
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172 printf_to_message_buffer ("Commands available in Info windows:\n\n"); |
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173 dump_map_to_message_buffer ("", info_keymap); |
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174 printf_to_message_buffer ("---------------------\n\n"); |
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175 printf_to_message_buffer ("Commands available in the echo area:\n\n"); |
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176 dump_map_to_message_buffer ("", echo_area_keymap); |
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177 |
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178 { |
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179 char *message; |
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180 |
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181 message = replace_in_documentation |
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182 ("--- Use `\\[history-node]' or `\\[kill-node]' to exit ---\n"); |
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183 printf_to_message_buffer ("%s", message); |
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184 } |
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185 |
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186 internal_info_help_node = message_buffer_to_node (); |
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187 add_gcable_pointer (internal_info_help_node->contents); |
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188 name_internal_node (internal_info_help_node, info_help_nodename); |
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189 |
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190 /* Even though this is an internal node, we don't want the window |
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191 system to treat it specially. So we turn off the internalness |
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192 of it here. */ |
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193 internal_info_help_node->flags &= ~N_IsInternal; |
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194 } |
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195 |
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196 /* Return a window which is the window showing help in this Info. */ |
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197 static WINDOW * |
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198 info_find_or_create_help_window () |
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199 { |
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200 WINDOW *help_window; |
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201 |
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202 help_window = get_internal_info_window (info_help_nodename); |
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203 |
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204 /* If we couldn't find the help window, then make it. */ |
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205 if (!help_window) |
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206 { |
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207 WINDOW *window, *eligible = (WINDOW *)NULL; |
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208 int max = 0; |
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209 |
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210 for (window = windows; window; window = window->next) |
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211 { |
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212 if (window->height > max) |
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213 { |
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214 max = window->height; |
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215 eligible = window; |
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216 } |
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217 } |
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218 |
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219 if (!eligible) |
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220 return ((WINDOW *)NULL); |
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221 else |
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222 { |
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223 /* Make a new node containing the help text. Split the largest |
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224 window into 2 windows, and show the help text in that window. */ |
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225 if (!internal_info_help_node) |
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226 create_internal_info_help_node (); |
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227 |
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228 if (eligible->height > 30) |
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229 { |
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230 active_window = eligible; |
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231 help_window = window_make_window (internal_info_help_node); |
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232 } |
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233 else |
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234 { |
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235 set_remembered_pagetop_and_point (active_window); |
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236 window_set_node_of_window |
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237 (active_window, internal_info_help_node); |
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238 help_window = active_window; |
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239 } |
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240 |
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241 remember_window_and_node (help_window, help_window->node); |
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242 } |
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243 } |
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244 return (help_window); |
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245 } |
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246 |
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247 /* Create or move to the help window. */ |
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248 DECLARE_INFO_COMMAND (info_get_help_window, "Display help message") |
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249 { |
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250 WINDOW *help_window; |
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251 |
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252 help_window = info_find_or_create_help_window (); |
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253 if (help_window) |
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254 { |
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255 active_window = help_window; |
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256 active_window->flags |= W_UpdateWindow; |
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257 } |
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258 else |
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259 { |
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260 info_error (CANT_MAKE_HELP); |
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261 } |
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262 } |
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263 |
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264 /* Show the Info help node. This means that the "info" file is installed |
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265 where it can easily be found on your system. */ |
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266 DECLARE_INFO_COMMAND (info_get_info_help_node, "Visit Info node `(info)Help'") |
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267 { |
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268 NODE *node; |
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269 char *nodename; |
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270 |
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271 /* If there is a window on the screen showing the node "(info)Help" or |
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272 the node "(info)Help-Small-Screen", simply select that window. */ |
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273 { |
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274 WINDOW *win; |
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275 |
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276 for (win = windows; win; win = win->next) |
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277 { |
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278 if (win->node && win->node->filename && |
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279 (stricmp |
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280 (filename_non_directory (win->node->filename), "info") == 0) && |
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281 ((strcmp (win->node->nodename, "Help") == 0) || |
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282 (strcmp (win->node->nodename, "Help-Small-Screen") == 0))) |
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283 { |
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284 active_window = win; |
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285 return; |
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286 } |
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287 } |
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288 } |
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289 |
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290 /* If the current window is small, show the small screen help. */ |
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291 if (active_window->height < 24) |
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292 nodename = "Help-Small-Screen"; |
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293 else |
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294 nodename = "Help"; |
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295 |
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296 /* Try to get the info file for Info. */ |
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297 node = info_get_node ("Info", nodename); |
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298 |
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299 if (!node) |
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300 { |
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301 if (info_recent_file_error) |
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302 info_error (info_recent_file_error); |
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303 else |
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304 info_error (CANT_FILE_NODE, "Info", nodename); |
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305 } |
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306 else |
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307 { |
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308 /* If the current window is very large (greater than 45 lines), |
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309 then split it and show the help node in another window. |
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310 Otherwise, use the current window. */ |
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311 |
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312 if (active_window->height > 45) |
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313 active_window = window_make_window (node); |
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314 else |
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315 { |
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316 set_remembered_pagetop_and_point (active_window); |
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317 window_set_node_of_window (active_window, node); |
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318 } |
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319 |
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320 remember_window_and_node (active_window, node); |
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321 } |
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322 } |
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323 |
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324 /* **************************************************************** */ |
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325 /* */ |
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326 /* Groveling Info Keymaps and Docs */ |
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327 /* */ |
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328 /* **************************************************************** */ |
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329 |
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330 /* Return the documentation associated with the Info command FUNCTION. */ |
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331 char * |
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332 function_documentation (function) |
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333 VFunction *function; |
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334 { |
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335 register int i; |
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336 |
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337 for (i = 0; function_doc_array[i].func; i++) |
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338 if (function == function_doc_array[i].func) |
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339 break; |
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340 |
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341 return (replace_in_documentation (function_doc_array[i].doc)); |
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342 } |
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343 |
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344 #if defined (NAMED_FUNCTIONS) |
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345 /* Return the user-visible name of the function associated with the |
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346 Info command FUNCTION. */ |
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347 char * |
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348 function_name (function) |
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349 |
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350 VFunction *function; |
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351 { |
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352 register int i; |
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353 |
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354 for (i = 0; function_doc_array[i].func; i++) |
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355 if (function == function_doc_array[i].func) |
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356 break; |
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357 |
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358 return (function_doc_array[i].func_name); |
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359 } |
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360 |
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361 /* Return a pointer to the function named NAME. */ |
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362 VFunction * |
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363 named_function (name) |
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364 char *name; |
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365 { |
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366 register int i; |
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367 |
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368 for (i = 0; function_doc_array[i].func; i++) |
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369 if (strcmp (function_doc_array[i].func_name, name) == 0) |
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370 break; |
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371 |
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372 return (function_doc_array[i].func); |
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373 } |
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374 #endif /* NAMED_FUNCTIONS */ |
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375 |
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376 /* Return the documentation associated with KEY in MAP. */ |
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377 char * |
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378 key_documentation (key, map) |
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379 char key; |
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380 Keymap map; |
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381 { |
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382 VFunction *function = map[key].function; |
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383 |
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384 if (function) |
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385 return (function_documentation (function)); |
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386 else |
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387 return ((char *)NULL); |
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388 } |
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389 |
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390 DECLARE_INFO_COMMAND (describe_key, "Print documentation for KEY") |
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391 { |
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392 char keyname[50]; |
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393 int keyname_index = 0; |
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394 unsigned char keystroke; |
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395 char *rep; |
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396 Keymap map; |
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397 |
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398 keyname[0] = '\0'; |
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399 map = window->keymap; |
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400 |
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401 while (1) |
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402 { |
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403 message_in_echo_area ("Describe key: %s", keyname); |
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404 keystroke = info_get_input_char (); |
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405 unmessage_in_echo_area (); |
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406 |
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407 if (Meta_p (keystroke) && (!ISO_Latin_p || key < 160)) |
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408 { |
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409 if (map[ESC].type != ISKMAP) |
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410 { |
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411 window_message_in_echo_area |
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412 ("ESC %s is undefined.", pretty_keyname (UnMeta (keystroke))); |
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413 return; |
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414 } |
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415 |
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416 strcpy (keyname + keyname_index, "ESC "); |
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417 keyname_index = strlen (keyname); |
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418 keystroke = UnMeta (keystroke); |
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419 map = (Keymap)map[ESC].function; |
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420 } |
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421 |
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422 /* Add the printed representation of KEYSTROKE to our keyname. */ |
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423 rep = pretty_keyname (keystroke); |
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424 strcpy (keyname + keyname_index, rep); |
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425 keyname_index = strlen (keyname); |
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426 |
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427 if (map[keystroke].function == (VFunction *)NULL) |
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428 { |
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429 message_in_echo_area ("%s is undefined.", keyname); |
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430 return; |
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431 } |
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432 else if (map[keystroke].type == ISKMAP) |
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433 { |
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434 map = (Keymap)map[keystroke].function; |
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435 strcat (keyname, " "); |
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436 keyname_index = strlen (keyname); |
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437 continue; |
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438 } |
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439 else |
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440 { |
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441 char *message, *fundoc, *funname = ""; |
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442 |
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443 #if defined (NAMED_FUNCTIONS) |
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444 funname = function_name (map[keystroke].function); |
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445 #endif /* NAMED_FUNCTIONS */ |
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446 |
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447 fundoc = function_documentation (map[keystroke].function); |
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448 |
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449 message = (char *)xmalloc |
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450 (10 + strlen (keyname) + strlen (fundoc) + strlen (funname)); |
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451 |
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452 #if defined (NAMED_FUNCTIONS) |
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453 sprintf (message, "%s (%s): %s.", keyname, funname, fundoc); |
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454 #else |
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455 sprintf (message, "%s is defined to %s.", keyname, fundoc); |
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456 #endif /* !NAMED_FUNCTIONS */ |
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457 |
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458 window_message_in_echo_area ("%s", message); |
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459 free (message); |
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460 break; |
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461 } |
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462 } |
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463 } |
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464 |
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465 /* How to get the pretty printable name of a character. */ |
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466 static char rep_buffer[30]; |
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467 |
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468 char * |
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469 pretty_keyname (key) |
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470 unsigned char key; |
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471 { |
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472 char *rep; |
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473 |
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474 if (Meta_p (key)) |
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475 { |
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476 char temp[20]; |
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477 |
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478 rep = pretty_keyname (UnMeta (key)); |
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479 |
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480 sprintf (temp, "ESC %s", rep); |
|
|
481 strcpy (rep_buffer, temp); |
|
|
482 rep = rep_buffer; |
|
|
483 } |
|
|
484 else if (Control_p (key)) |
|
|
485 { |
|
|
486 switch (key) |
|
|
487 { |
|
|
488 case '\n': rep = "LFD"; break; |
|
|
489 case '\t': rep = "TAB"; break; |
|
|
490 case '\r': rep = "RET"; break; |
|
|
491 case ESC: rep = "ESC"; break; |
|
|
492 |
|
|
493 default: |
|
|
494 sprintf (rep_buffer, "C-%c", UnControl (key)); |
|
|
495 rep = rep_buffer; |
|
|
496 } |
|
|
497 } |
|
|
498 else |
|
|
499 { |
|
|
500 switch (key) |
|
|
501 { |
|
|
502 case ' ': rep = "SPC"; break; |
|
|
503 case DEL: rep = "DEL"; break; |
|
|
504 default: |
|
|
505 rep_buffer[0] = key; |
|
|
506 rep_buffer[1] = '\0'; |
|
|
507 rep = rep_buffer; |
|
|
508 } |
|
|
509 } |
|
|
510 return (rep); |
|
|
511 } |
|
|
512 |
|
|
513 /* Replace the names of functions with the key that invokes them. */ |
|
|
514 static char *where_is (), *where_is_internal (); |
|
|
515 |
|
|
516 char * |
|
|
517 replace_in_documentation (string) |
|
|
518 char *string; |
|
|
519 { |
|
|
520 register int i, start, next; |
|
|
521 static char *result = (char *)NULL; |
|
|
522 |
|
|
523 maybe_free (result); |
|
|
524 result = (char *)xmalloc (1 + strlen (string)); |
|
|
525 |
|
|
526 i = next = start = 0; |
|
|
527 |
|
|
528 /* Skip to the beginning of a replaceable function. */ |
|
|
529 for (i = start; string[i]; i++) |
|
|
530 { |
|
|
531 /* Is this the start of a replaceable function name? */ |
|
|
532 if (string[i] == '\\' && string[i + 1] == '[') |
|
|
533 { |
|
|
534 char *fun_name, *rep; |
|
|
535 VFunction *function; |
|
|
536 |
|
|
537 /* Copy in the old text. */ |
|
|
538 strncpy (result + next, string + start, i - start); |
|
|
539 next += (i - start); |
|
|
540 start = i + 2; |
|
|
541 |
|
|
542 /* Move to the end of the function name. */ |
|
|
543 for (i = start; string[i] && (string[i] != ']'); i++); |
|
|
544 |
|
|
545 fun_name = (char *)xmalloc (1 + i - start); |
|
|
546 strncpy (fun_name, string + start, i - start); |
|
|
547 fun_name[i - start] = '\0'; |
|
|
548 |
|
|
549 /* Find a key which invokes this function in the info_keymap. */ |
|
|
550 function = named_function (fun_name); |
|
|
551 |
|
|
552 /* If the internal documentation string fails, there is a |
|
|
553 serious problem with the associated command's documentation. |
|
|
554 We croak so that it can be fixed immediately. */ |
|
|
555 if (!function) |
|
|
556 abort (); |
|
|
557 |
|
|
558 rep = where_is (info_keymap, function); |
|
|
559 strcpy (result + next, rep); |
|
|
560 next = strlen (result); |
|
|
561 |
|
|
562 start = i; |
|
|
563 if (string[i]) |
|
|
564 start++; |
|
|
565 } |
|
|
566 } |
|
|
567 strcpy (result + next, string + start); |
|
|
568 return (result); |
|
|
569 } |
|
|
570 |
|
|
571 /* Return a string of characters which could be typed from the keymap |
|
|
572 MAP to invoke FUNCTION. */ |
|
|
573 static char *where_is_rep = (char *)NULL; |
|
|
574 static int where_is_rep_index = 0; |
|
|
575 static int where_is_rep_size = 0; |
|
|
576 |
|
|
577 static char * |
|
|
578 where_is (map, function) |
|
|
579 Keymap map; |
|
|
580 VFunction *function; |
|
|
581 { |
|
|
582 char *rep; |
|
|
583 |
|
|
584 if (!where_is_rep_size) |
|
|
585 where_is_rep = (char *)xmalloc (where_is_rep_size = 100); |
|
|
586 where_is_rep_index = 0; |
|
|
587 |
|
|
588 rep = where_is_internal (map, function); |
|
|
589 |
|
|
590 /* If it couldn't be found, return "M-x Foo". */ |
|
|
591 if (!rep) |
|
|
592 { |
|
|
593 char *name; |
|
|
594 |
|
|
595 name = function_name (function); |
|
|
596 |
|
|
597 if (name) |
|
|
598 sprintf (where_is_rep, "M-x %s", name); |
|
|
599 |
|
|
600 rep = where_is_rep; |
|
|
601 } |
|
|
602 return (rep); |
|
|
603 } |
|
|
604 |
|
|
605 /* Return the printed rep of FUNCTION as found in MAP, or NULL. */ |
|
|
606 static char * |
|
|
607 where_is_internal (map, function) |
|
|
608 Keymap map; |
|
|
609 VFunction *function; |
|
|
610 { |
|
|
611 register int i; |
|
|
612 |
|
|
613 /* If the function is directly invokable in MAP, return the representation |
|
|
614 of that keystroke. */ |
|
|
615 for (i = 0; i < 256; i++) |
|
|
616 if ((map[i].type == ISFUNC) && map[i].function == function) |
|
|
617 { |
|
|
618 sprintf (where_is_rep + where_is_rep_index, "%s", pretty_keyname (i)); |
|
|
619 return (where_is_rep); |
|
|
620 } |
|
|
621 |
|
|
622 /* Okay, search subsequent maps for this function. */ |
|
|
623 for (i = 0; i < 256; i++) |
|
|
624 { |
|
|
625 if (map[i].type == ISKMAP) |
|
|
626 { |
|
|
627 int saved_index = where_is_rep_index; |
|
|
628 char *rep; |
|
|
629 |
|
|
630 sprintf (where_is_rep + where_is_rep_index, "%s ", |
|
|
631 pretty_keyname (i)); |
|
|
632 |
|
|
633 where_is_rep_index = strlen (where_is_rep); |
|
|
634 rep = where_is_internal ((Keymap)map[i].function, function); |
|
|
635 |
|
|
636 if (rep) |
|
|
637 return (where_is_rep); |
|
|
638 |
|
|
639 where_is_rep_index = saved_index; |
|
|
640 } |
|
|
641 } |
|
|
642 |
|
|
643 return ((char *)NULL); |
|
|
644 } |
|
|
645 |
|
|
646 extern char *read_function_name (); |
|
|
647 |
|
|
648 DECLARE_INFO_COMMAND (info_where_is, |
|
|
649 "Show what to type to execute a given command") |
|
|
650 { |
|
|
651 char *command_name; |
|
|
652 |
|
|
653 command_name = read_function_name ("Where is command: ", window); |
|
|
654 |
|
|
655 if (!command_name) |
|
|
656 { |
|
|
657 info_abort_key (active_window, count, key); |
|
|
658 return; |
|
|
659 } |
|
|
660 |
|
|
661 if (*command_name) |
|
|
662 { |
|
|
663 VFunction *function; |
|
|
664 |
|
|
665 function = named_function (command_name); |
|
|
666 |
|
|
667 if (function) |
|
|
668 { |
|
|
669 char *location; |
|
|
670 |
|
|
671 location = where_is (active_window->keymap, function); |
|
|
672 |
|
|
673 if (!location) |
|
|
674 { |
|
|
675 info_error ("`%s' is not on any keys", command_name); |
|
|
676 } |
|
|
677 else |
|
|
678 { |
|
|
679 if (strncmp (location, "M-x ", 4) == 0) |
|
|
680 window_message_in_echo_area |
|
|
681 ("%s can only be invoked via %s.", command_name, location); |
|
|
682 else |
|
|
683 window_message_in_echo_area |
|
|
684 ("%s can be invoked via %s.", command_name, location); |
|
|
685 } |
|
|
686 } |
|
|
687 else |
|
|
688 info_error ("There is no function named `%s'", command_name); |
|
|
689 } |
|
|
690 |
|
|
691 free (command_name); |
|
|
692 } |
|
|
693 |
