Mercurial > hg
annotate mcabber/doc/HOWTO_modules.txt @ 1624:a75611931642
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author | Myhailo Danylenko <isbear@ukrpost.net> |
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date | Thu, 15 Oct 2009 12:50:54 +0300 |
parents | 2a82e6654c04 |
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1 |
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2 =========================================== |
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3 |
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4 Mcabber module writing brief howto |
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5 |
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6 =========================================== |
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7 |
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8 Mcabber loads modules via glib's GModule. |
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9 |
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10 Thus, in your module you can provide functions |
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11 |
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12 -------------------------------------------------------- |
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13 const gchar* g_module_check_init (GModule *module); |
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14 void g_module_unload (GModule *module); |
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15 -------------------------------------------------------- |
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16 |
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17 to do something when module is loaded and unloaded. |
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18 |
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19 As module is loaded, you can use mcabber functions, |
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20 declared in mcabber's header files (though you should |
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21 consider, that they may change their calling conventions |
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22 some day). |
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23 |
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24 I will not explain them all, there are too much of |
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25 them, but will provide description for those, provided |
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26 especially for module writers. |
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27 |
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28 -------------------------------------------------------- |
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29 #include "commands.h" |
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30 |
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31 void cmd_add (const char *name, const char *help, |
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32 guint flags1, guint flags2, |
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33 void (*f)(char*), gpointer userdata); |
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34 void cmd_del (const char *name); |
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35 -------------------------------------------------------- |
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36 |
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37 These two functions are provided to declare mcabber |
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38 commands, offered by your module. |
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39 - name is a command name. |
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40 - help is a short description of your command, however |
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41 for now it is not used at all and can be omitted. |
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42 - flags are completion identifiers for first and second |
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43 command arguments, for list of built-in completions, |
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44 see compl.h. You can declare your own completion |
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45 lists, using functions from compl.h, described later. |
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46 - f is a user-provided callback function, that will be |
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47 called upon executing mcabber command. If you will |
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48 provide non-NULL userdata, function must be of type |
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49 void (*f) (char *commandline, gpointer userdata). |
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50 - userdata is a pointer to data, transparently passed |
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51 to callback. See f description. |
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52 |
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53 -------------------------------------------------------- |
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54 #include "compl.h" |
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55 |
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56 guint compl_new_category (void); |
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57 void compl_del_category (guint id); |
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58 |
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59 void compl_add_category_word (guint categ, |
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60 const char *command); |
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61 void compl_del_category_word (guint categ, |
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62 const char *word); |
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63 GSList *compl_get_category_list (guint cat_flags, |
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64 guint *dynlist); |
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65 -------------------------------------------------------- |
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66 |
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67 These functions allow you to define and manage word |
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68 lists for completion categories, used by your commands. |
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69 First you need to obtain handle for completion type, |
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70 that you later will supply as flags, when declaring |
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71 your commands. For that use function compl_new_category. |
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72 It returns new category id or zero, if mcabber runs |
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73 out of completion ids (for now there are only 32 ids |
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74 available, and 20 of them are already taken by builtin |
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75 commands). compl_del_category allows you to delete |
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76 user-defined category, deleting all words in it too. |
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77 |
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78 Now, that you have a completion category, you can at any |
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79 time add or delete words from it's completion list. |
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80 For that use functions compl_add_category_word and |
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81 compl_del_category_word. You can obtain current contents |
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82 of category by using gompl_get_category_list. If after |
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83 execution dynlist is TRUE, you should free obtained |
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84 list of commands. |
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85 |
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86 -------------------------------------------------------- |
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87 #include "hooks.h" |
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88 |
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89 typedef struct { |
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90 const char *name; |
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91 const char *value; |
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92 } hk_arg_t; |
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93 |
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94 typedef void (*hk_handler_t) (guint32 hookid, |
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95 hk_arg_t *args, |
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96 gpointer userdata); |
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97 |
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98 void hk_add_handler (hk_handler_t handler, |
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99 guint32 flags, |
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100 gpointer userdata); |
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101 void hk_del_handler (hk_handler_t handler, |
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102 gpointer userdata); |
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103 -------------------------------------------------------- |
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104 |
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105 These functions allow your module to react to events, |
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106 such as incoming and outgoing messages, buddy status |
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107 changes and sever connection establishment or breakup. |
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108 Flags field specifies mask of events, upon which this |
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109 handler should be called. Flags, that comprise this |
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110 mask can be found in hooks.h. You can specify not yet |
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111 used flags in mask, if you need to handle all events. |
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112 Handler can determine, which event is occured by |
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113 hookid argument and by a "hook" field in args, that |
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114 may provide more precise information in some cases. |
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115 Args argument is a list of hk_arg_t structures, |
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116 terminated by structure, whose name field is set to |
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117 NULL. Usually the "hook" field is in the first |
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118 structure of the list, however it is not guaranted, |
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119 that this will be so forever. |
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120 |
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121 Currently there are next events possible: |
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122 - hook-message-in (HOOK_MESSAGE_IN) with parameters |
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123 * jid - sender of the incoming message |
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124 * message - message body, converted to locale |
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125 charset |
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126 * groupchat ("true" or "false") |
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127 - hook-message-out (HOOK_MESSAGE_OUT) with parameters |
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128 * jid - recipient of the outgoing message |
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129 * message - message body, converted to locale |
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130 charset |
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131 - hook-status-change (HOOK_STATUS_CHANGE) with |
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132 parameters |
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133 * jid - buddy, whose status has changed |
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134 * resource - resource, whose status has changed |
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135 * old_status - old status of the buddy, one-char |
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136 string, representing mcabber status letter - |
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137 one of 'ofdna?_'. |
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138 * new_status - new buddy status. The same as |
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139 old_status. |
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140 * message - new status message. Old one should be |
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141 still available to module as the current buddy's |
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142 message. |
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143 - hook-my-status-change (HOOK_MY_STATUS_CHANGE) with |
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144 parameters |
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145 * new_status - user's new status, see |
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146 hook-status-change. Old one should still be |
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147 available as the current status of the user. |
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148 * message - new status message |
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149 - hook-post-connect (HOOK_INTERNAL) with no parameters |
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150 - hook-pre-disconnect (HOOK_INTERNAL) with no |
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151 parameters |
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152 |
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153 -------------------------------------------------------- |
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154 #include "xmpp_helper.h" |
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155 |
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156 void xmpp_add_feature (const char *xmlns); |
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157 void xmpp_del_feature (const char *xmlns); |
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158 -------------------------------------------------------- |
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159 |
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160 These functions may be useful, if your module implements |
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161 some additional functionality to mcabber, that should be |
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162 advertised in a client's discovery features list. |
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163 |
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164 ===================== |
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165 |
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166 Example: hello |
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167 |
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168 ===================== |
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169 |
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170 Now, let's write a simple module, called "hello", that |
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171 will do no more than just print something on loading |
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172 and unloading. |
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173 |
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174 -------------------------------------------------------- |
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175 #include <glib.h> |
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176 #include <gmodule.h> |
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177 |
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178 /* We will use scr_LogPrint mcabber function, |
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179 that does mcabber's messages output */ |
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180 #include "logprint.h" |
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181 |
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182 /* Print something on module loading */ |
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183 const gchar* g_module_check_init (GModule *module) |
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184 { |
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185 scr_LogPrint (LPRINT_LOGNORM, "Hello, World!"); |
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186 return NULL; |
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187 } |
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188 |
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189 /* ... and unloading */ |
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190 void g_module_unload (GModule *module) |
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191 { |
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192 scr_LogPrint (LPRINT_LOGNORM, "Bye, World!"); |
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193 } |
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194 |
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195 /* The End */ |
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196 -------------------------------------------------------- |
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197 |
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198 Now, compile this file (hello.c) with |
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199 |
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200 libtool --mode=compile gcc `pkg-config --cflags glib-2.0 \ |
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201 gmodule-2.0` -c hello.c |
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202 libtool --mode=link gcc -module -rpath /usr/lib/mcabber/ \ |
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203 `pkg-config --libs glib-2.0 gmodule-2.0` -o libhello.la \ |
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204 hello.lo |
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205 |
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206 (you should substitute /usr/lib/mcabber to directory, where |
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207 your modules are located) and then install obtained module with |
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208 |
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209 libtool --mode=install install libhello.la \ |
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210 /usr/lib/mcabber/libhello.la |
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211 |
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212 Note, that you, most likely need not run suggested by libtool |
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213 finish action, as we're working with module object, not system- |
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214 wide library, but maybe some systems require that. |
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215 |
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216 Now, set modules_dir mcabber variable to point to your modules |
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217 dir, and try to run /load hello. If all goes well, you should |
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218 see in status buffer message "Hello World!". |
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219 Now unload module by running command /unload hello, that |
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220 should bring up message "Bye, World!". |
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221 |
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222 That's it, you just created very simple dynamically loadable |
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223 mcabber module. |
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224 |
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225 ======================= |
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226 |
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227 Example: command |
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228 |
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229 ======================= |
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230 |
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231 Now, let's allow our module to do some real work. |
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232 |
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233 -------------------------------------------------------- |
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234 #include <glib.h> |
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235 #include <gmodule.h> |
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236 |
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237 #include "logprint.h" |
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238 #include "commands.h" |
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239 |
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240 /* Handler for command */ |
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241 void do_hello (char *args) |
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242 { |
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243 /* args contains command line with command |
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244 * name and any spaces after it stripped */ |
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245 scr_LogPrint (LPRINT_LOGNORM, "Hello, %s!", |
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246 *args != '\0' ? args : "World"); |
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247 } |
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248 |
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249 /* Register command */ |
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250 const gchar* g_module_check_init (GModule *module) |
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251 { |
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252 cmd_add ("hello", "", 0, 0, do_hello, NULL); |
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253 return NULL; |
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254 } |
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255 |
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256 /* Unregister command */ |
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257 void g_module_unload (GModule *module) |
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258 { |
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259 cmd_del ("hello"); |
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260 } |
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261 |
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262 /* The End */ |
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263 -------------------------------------------------------- |
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264 |
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265 There we will need also config.h with defined MODULES_ENABLE |
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266 to satisfy ifdefs in commands.h. You can get one from mcabber |
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267 build tree, generated by configure or just provide your own: |
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268 |
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269 -------------------------------------------------------- |
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270 #ifndef LOCAL_CONFIG_H |
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271 #define LOCAL_CONFIG_H |
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272 |
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273 #define MODULES_ENABLE 1 |
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274 |
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275 #endif |
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276 -------------------------------------------------------- |
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277 |
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278 Now, compile it and try to load and run /hello with some |
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279 arguments. |
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280 |
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281 Note, that we used one-argument version of command |
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282 handler, as we specified no userdata. |
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283 |
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284 ========================== |
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285 |
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286 Example: completion |
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287 |
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288 ========================== |
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289 |
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290 Now le's investigate how to provide custom completion to |
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291 your commands. You can as well use built-in completions, |
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292 their IDs are listed in compl.h. |
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293 |
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294 -------------------------------------------------------- |
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295 #include <glib.h> |
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296 #include <gmodule.h> |
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297 |
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298 #include "logprint.h" |
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299 #include "commands.h" |
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300 #include "compl.h" |
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301 |
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302 static guint hello_cid = 0; |
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303 |
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304 /* hello command handler */ |
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305 void do_hello (char *args) |
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306 { |
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307 /* If argument is provided, add it to |
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308 * completions list. */ |
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309 if (hello_cid && *args != '\0') |
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310 compl_add_category_word (hello_cid, |
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311 args); |
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312 scr_LogPrint (LPRINT_LOGNORM, "Hello, %s!", |
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313 *args != '\0' ? args : "World"); |
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314 } |
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315 |
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316 /* Initialization */ |
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317 const gchar* g_module_check_init (GModule *module) |
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318 { |
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319 /* Obtain handle for our completion |
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320 * category */ |
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321 hello_cid = compl_new_category (); |
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322 if (hello_cid) |
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323 /* Add known default word to |
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324 * completion list */ |
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325 compl_add_category_word (hello_cid, |
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326 "World"); |
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327 cmd_add ("hello", "", hello_cid, 0, do_hello, |
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328 NULL); |
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329 return NULL; |
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330 } |
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331 |
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332 /* Deinitialization */ |
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333 void g_module_unload (GModule *module) |
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334 { |
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335 /* Give back category handle */ |
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336 if (hello_cid) |
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337 compl_del_category (hello_cid); |
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338 cmd_del ("hello"); |
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339 } |
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340 |
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341 /* The End */ |
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342 -------------------------------------------------------- |
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343 |
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344 Now you can use completion for hello command. Note, that |
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345 this code have some serious simplifications, made for |
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346 simplicity reasons. For now, compl_add_category_word |
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347 does not checks, if word already exists in completions |
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348 list (although it is marked as TODO, so, some day it |
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349 will), so, we should check it ourselves. Also, we should |
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350 check, that args contains only one word, or this will |
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351 confuse completion system, so, it will stop on this |
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352 completion. |
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353 |
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354 ===================== |
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355 |
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356 Example: hooks |
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357 |
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358 ===================== |
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359 |
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360 Now let's implement our own beeper. Why anyone may wish |
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361 to do this? I am not satisfied with default mcabber's |
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362 builtin beeper flexibility. I wanted beeping on any |
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363 muc conference message, not just ones, directed to me. |
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364 |
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365 -------------------------------------------------------- |
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366 #include <glib.h> |
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367 #include <gmodule.h> |
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368 #include <string.h> |
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369 |
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370 #include "logprint.h" |
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371 #include "commands.h" |
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372 #include "compl.h" |
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373 #include "hooks.h" |
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374 #include "screen.h" |
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375 #include "settings.h" |
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376 |
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377 static guint beep_cid = 0; |
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378 |
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379 /* Event handler */ |
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380 void beep_hh (guint32 hid, hk_arg_t *args, gpointer userdata) |
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381 { |
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382 /* Check if beeping is enabled */ |
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383 if (settings_opt_get_int ("beep_enable")) |
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384 /* *BEEP*! */ |
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385 scr_Beep (); |
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386 } |
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387 |
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388 /* beep command handler */ |
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389 void do_beep (char *args) |
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390 { |
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391 /* Check arguments, and if recognized, |
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392 * set mcabber option accordingly */ |
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393 if (!strcmp (args, "enable") || |
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394 !strcmp (args, "on") || |
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395 !strcmp (args, "yes") || |
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396 !strcmp (args, "1")) |
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397 settings_set (SETTINGS_TYPE_OPTION, |
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398 "beep_enable", "1"); |
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399 else if (!strcmp (args, "disable") || |
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400 !strcmp (args, "off") || |
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401 !strcmp (args, "no") || |
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402 !strcmp (args, "0")) |
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403 settings_set (SETTINGS_TYPE_OPTION, |
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404 "beep_enable", "0"); |
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405 |
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406 /* Output current state, either if state is |
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407 * changed and if argument is not recognized */ |
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408 if (settings_opt_get_int ("beep_enable")) |
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409 scr_LogPrint (LPRINT_NORMAL, |
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410 "Beep on messages is enabled"); |
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411 else |
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412 scr_LogPrint (LPRINT_NORMAL, |
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413 "Beep on messages is disabled"); |
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414 } |
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415 |
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416 /* Initialization */ |
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417 const gchar* g_module_check_init (GModule *module) |
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418 { |
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419 /* Create completions */ |
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420 beep_cid = compl_new_category (); |
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421 if (beep_cid) { |
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422 compl_add_category_word (beep_cid, "enable"); |
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423 compl_add_category_word (beep_cid, "disable"); |
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424 } |
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425 /* Add command */ |
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426 cmd_add ("beep", "", beep_cid, 0, do_beep, NULL); |
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427 /* Add handler |
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428 * We are only interested in incoming message events |
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429 */ |
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430 hk_add_handler (beep_hh, HOOK_MESSAGE_IN, NULL); |
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431 return NULL; |
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432 } |
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433 |
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434 /* Deinitialization */ |
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435 void g_module_unload (GModule *module) |
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436 { |
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437 /* Unregister event handler */ |
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438 hk_del_handler (beep_hh, NULL); |
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439 /* Unregister command */ |
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440 cmd_del ("beep"); |
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441 /* Give back completion handle */ |
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442 if (beep_cid) |
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443 compl_del_category (beep_cid); |
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444 } |
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445 |
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446 /* The End */ |
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447 -------------------------------------------------------- |
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448 |
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449 As you can see, here we used the fact, that right now |
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450 all the hooks provide "hook" argument as a first element |
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451 in args, however this can change in future. |
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452 |
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453 Note, that to compile this we also need to add loudmouth-1.0 |
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454 to pkg-config command line and to add -I. to compilation |
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455 mode gcc command line (specify include directory with our |
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456 config.h as system include directory), so, you will have |
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457 something like |
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458 |
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459 libtool --mode=compile gcc `pkg-config --cflags glib-2.0 \ |
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460 gmodule-2.0 loudmouth-1.0` -I. -c beep.c |
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461 libtool --mode=link gcc -module -rpath /usr/lib/mcabber/ \ |
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462 `pkg-config --cflags glib-2.0 gmodule-2.0 loudmouth-1.0` \ |
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463 -o libbeep.la beep.lo |
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464 libtool --mode=install install libbeep.la \ |
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465 /usr/lib/mcabber/libbeep.la |
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466 |
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467 If you use CMake (as do I), corresponding CMakeLists.txt |
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468 snippet: |
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469 |
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470 -------------------------------------------------------- |
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471 cmake_minimum_required(VERSION 2.6) |
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472 project(beep C) |
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473 |
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474 add_library(beep MODULE beep.c) |
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475 |
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476 set(MCABBER_INCLUDE_DIR "${beep_SOURCE_DIR}/include" |
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477 CACHE FILEPATH "Path to mcabber headers") |
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478 |
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479 find_package(PkgConfig REQUIRED) |
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480 pkg_check_modules(GLIB REQUIRED glib-2.0) |
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481 pkg_check_modules(GMODULE REQUIRED gmodule-2.0) |
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482 pkg_check_modules(LM REQUIRED loudmouth-1.0) |
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483 |
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484 include_directories(SYSTEM ${GLIB_INCLUDE_DIRS} |
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485 ${GMODULE_INCLUDE_DIRS} |
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486 ${LM_INCLUDE_DIRS}) |
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487 target_link_libraries(beep ${GLIB_LIBRARIES} |
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488 ${GMODULE_LIBRARIES}) |
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489 include_directories(${beep_SOURCE_DIR} |
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490 ${beep_BINARY_DIR} |
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491 ${MCABBER_INCLUDE_DIR}) |
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492 |
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493 install(TARGETS beep DESTINATION lib/mcabber) |
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494 -------------------------------------------------------- |
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495 |
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496 ============== |
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497 |
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498 Further |
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499 |
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500 ============== |
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501 |
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502 As mcabber-lm uses glib mainloop, you can use glib's |
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503 event sources, for example, fifo reading can be easily |
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504 modularized with GIOChannels. |
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505 |
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506 You can extend xmpp part of mcabber functionality by |
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507 providing lm message handlers with high priority and |
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508 allowing unhandled by your handler messages be taken |
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509 care by mcabber's handlers on normal priority level. |
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510 This is where you may need to modify set of advertised |
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511 supported disco features. |
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512 |
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513 Many useful examples can be found in my mcabber-lua |
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514 module. |
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515 |
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516 If you think, that your module needs to change |
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517 something, hardcoded in current implementation - feel |
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518 free to mail me or join mcabber's MUC room and |
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519 discuss this - for now I have only implemented things, |
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Myhailo Danylenko <isbear@ukrpost.net>
parents:
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520 that I found necessary for mcabber-lua module. |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
521 |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
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522 Also I am not native English speaker, so, if you find |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
523 some errors or non-natural constructs in this howto, |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
524 please, inform me (I will be glad, if you also provide |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
525 a more suitable version of text in question). |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
526 |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
527 -- Myhailo Danylenko <isbear@ukrpost.net> |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
528 -- Mon, 05 Oct 2009 00:00:00 +0300 |
2a82e6654c04
Add a module writing howto
Myhailo Danylenko <isbear@ukrpost.net>
parents:
diff
changeset
|
529 |