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annotate mcabber/doc/HOWTO_modules.txt @ 1895:7043542b3565
Do not block MUC private messages when 'block_unsubscribed' is set
author | Mikael Berthe <mikael@lilotux.net> |
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date | Sun, 11 Apr 2010 20:02:16 +0200 |
parents | ea3f9b4f3558 |
children | 5d37cee8c6c6 |
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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 |
1830 | 8 To obtain information on module mcabber uses struct module_info_t, that |
9 module should provide in public variable with name info_<modulename>. | |
10 If the module name contains any extra symbols except [a-z0-9_] they | |
11 should be replaced with '_'. | |
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12 |
1830 | 13 ------------------------------------------------------------------------ |
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14 #include <mcabber/modules.h> |
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15 |
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16 typedef void (*module_init_t)(void); |
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17 typedef void (*module_uninit_t)(void); |
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18 |
1752 | 19 typedef struct module_info_struct module_info_t; |
20 struct module_info_struct { | |
21 const gchar *branch; | |
22 guint api; | |
23 const gchar *version; | |
24 const gchar *description; | |
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25 const gchar **requires; |
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26 module_init_t init; |
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27 module_uninit_t uninit; |
1752 | 28 module_info_t *next; |
29 }; | |
1830 | 30 ------------------------------------------------------------------------ |
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31 |
1830 | 32 Callbacks init and uninit will be called after module and its |
33 dependencies loading. 'requires' can contain a NULL-terminated list of | |
34 module names, that should be loaded before this. 'branch' and 'api' are | |
35 required and should contain mcabber branch and api version, that this | |
36 module is designed to work with. For these values see ChangeLog.api. | |
37 'version' and 'description' fields are optional and just provide user | |
38 with additional information about the module. 'description' field can | |
39 contain newlines. The 'next' field can contain pointer to the next | |
40 struct with another branch of mcabber, if your module can work with | |
41 multiple branches. | |
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42 |
1830 | 43 To load modules, mcabber uses glib's GModule, thus, in your module you |
44 can also use functions | |
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45 |
1830 | 46 ------------------------------------------------------------------------ |
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47 #include <glib.h> |
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48 #include <gmodule.h> |
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49 |
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50 const gchar* g_module_check_init (GModule *module); |
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51 void g_module_unload (GModule *module); |
1830 | 52 ------------------------------------------------------------------------ |
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53 |
1830 | 54 to do something before any version/dependency check is performed when |
55 your module is loaded/unloaded. On success g_module_check_init should | |
56 return NULL, and error message otherwise. | |
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57 |
1830 | 58 As module is loaded, you can use mcabber functions, declared in |
59 mcabber's header files (though you should consider, that they may change | |
60 their calling conventions some day). | |
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61 |
1830 | 62 I will not explain them all, there are too much of them, but will |
63 provide description for those, provided especially for module writers. | |
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64 |
1830 | 65 ------------------------------------------------------------------------ |
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66 #include <mcabber/modules.h> |
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67 |
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68 const gchar *module_load (const gchar *name, |
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69 gboolean manual, |
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70 gboolean force); |
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71 const gchar *module_unload (const gchar *name, |
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72 gboolean manual, |
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73 gboolean force); |
1830 | 74 ------------------------------------------------------------------------ |
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75 |
1830 | 76 These functions load and unload modules respectively. You can use them |
77 to handle optional dependencies. What happens, when module is loaded: | |
78 - check if module is present, and if present just increase it's | |
79 reference count | |
80 - load .so via glib (and call g_module_check_init, if present) | |
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81 - check for information structure presence |
1830 | 82 - find suitable branch and check api version compatibility |
83 - load modules, that this module requires (note, that dependency | |
84 problems will be reported as error invariably, force flag have no | |
85 effect on this check) | |
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86 - module placed into a list of modules |
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87 - module init routine is called |
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88 And when unloaded: |
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89 - check if module is present |
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90 - decrease reference count, if it is not zero, return |
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91 - run module uninit routine |
1830 | 92 - unload modules, that were loaded as dependencies for this one |
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93 - remove from modules list |
1830 | 94 They return error message or NULL in case of success. 'manual' flag |
95 indicates, that module will be loaded by direct user request. It serves | |
96 the purpose of tracking user and automatic references (user can have | |
97 only one). 'force' flag on module loading causes mcabber to ignore most | |
98 of the loading errors. On unload it forces unloading even if reference | |
99 count is not zero. | |
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100 |
1830 | 101 ------------------------------------------------------------------------ |
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102 #include <mcabber/commands.h> |
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103 |
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104 void cmd_add (const char *name, const char *help, |
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105 guint flags1, guint flags2, |
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106 void (*f)(char*), gpointer userdata); |
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107 void cmd_del (const char *name); |
1830 | 108 ------------------------------------------------------------------------ |
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109 |
1830 | 110 These two functions are provided to declare mcabber commands, offered by |
111 your module. | |
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112 - name is a command name. |
1830 | 113 - help is a short description of your command, however for now it is |
114 not used at all and can be omitted. | |
115 - flags are completion identifiers for first and second command | |
116 arguments, for list of built-in completions, see compl.h. You can | |
117 declare your own completion lists, using functions from compl.h, | |
118 described later. | |
119 - f is a user-provided callback function, that will be called upon | |
120 executing mcabber command. If you will provide non-NULL userdata, | |
121 function must be of type | |
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122 void (*f) (char *commandline, gpointer userdata). |
1830 | 123 - userdata is a pointer to data, transparently passed to callback. |
124 See f description. | |
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125 |
1830 | 126 ------------------------------------------------------------------------ |
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127 #include <mcabber/compl.h> |
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128 |
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129 guint compl_new_category (void); |
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130 void compl_del_category (guint id); |
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131 |
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132 void compl_add_category_word (guint categ, |
1830 | 133 const char *command); |
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134 void compl_del_category_word (guint categ, |
1830 | 135 const char *word); |
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136 GSList *compl_get_category_list (guint cat_flags, |
1830 | 137 guint *dynlist); |
138 ------------------------------------------------------------------------ | |
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139 |
1830 | 140 These functions allow you to define and manage word lists for completion |
141 categories, used by your commands. First you need to obtain handle for | |
142 completion type, that you later will supply as flags, when declaring | |
143 your commands. For that use function compl_new_category. It returns | |
144 new category id, or zero if mcabber runs out of completion ids (for now | |
145 there are only 32 ids available, and 20 of them are already used for | |
146 builtin commands). compl_del_category allows you to delete user-defined | |
147 category, deleting all words in it too. | |
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148 |
1830 | 149 Now, that you have a completion category, you can at any time add or |
150 delete words from its completion list. To do that, use the functions | |
151 compl_add_category_word and compl_del_category_word. You can obtain | |
152 current contents of category by using gompl_get_category_list. If after | |
153 execution dynlist is TRUE, you should free obtained list of words (both, | |
154 words and list). | |
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155 |
1830 | 156 ------------------------------------------------------------------------ |
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157 #include <mcabber/hooks.h> |
1830 | 158 |
159 typedef struct { | |
160 const char *name; | |
161 const char *value; | |
162 } hk_arg_t; | |
163 | |
164 typedef guint (*hk_handler_t) (const gchar *hookname, | |
165 hk_arg_t *args, | |
166 gpointer userdata); | |
167 | |
168 guint hk_add_handler (hk_handler_t handler, | |
169 const gchar *hookname, | |
170 gint priority, | |
171 gpointer userdata); | |
172 void hk_del_handler (const gchar *hookname, | |
173 guint hid); | |
174 ------------------------------------------------------------------------ | |
175 | |
176 These functions allow your module to react to events, such as incoming | |
177 and outgoing messages, buddy status changes and server connection | |
178 establishment or breakup. The hookname string specifies the events the | |
179 handler wants to subscribe to. The available strings can be found in | |
180 hooks.h. | |
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181 |
1830 | 182 The hk_add_handler() function will return a handler id which you will |
183 use to remove the handler with hk_del_handler(). | |
184 Args argument is a list of hk_arg_t structures, terminated by structure, | |
185 whose name field is set to NULL. | |
186 | |
187 Your handler should return one of the values in the hk_handler_result | |
188 enum (see hooks.h), usually HOOK_HANDLER_RESULT_ALLOW_MORE_HANDLERS so | |
189 that other handlers can be triggers as well. | |
190 | |
191 A handler can determine which event has occured by checking the hookname | |
192 argument (a same hook handler can subscribe to several events by using | |
193 hk_add_handler() several times). | |
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194 |
1830 | 195 Currently the following events exist: |
196 - hook-pre-message-in (HOOK_PRE_MESSAGE_IN) with parameters | |
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197 * jid - sender of the incoming message |
1830 | 198 * resource - resource of the incoming message |
199 * message - message body, converted to locale charset | |
200 * groupchat - ("true" or "false") | |
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201 * delayed - message timestamp (ISO-8601 string) or empty string if |
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202 the message wasn't delayed |
1830 | 203 - hook-post-message-in (HOOK_POST_MESSAGE_IN) with parameters |
204 * jid - sender of the incoming message | |
205 * resource - resource of the incoming message | |
206 * message - message body, converted to locale charset | |
207 * groupchat - ("true" or "false") | |
208 * attention - In a MUC message, true if you've been highlighted | |
209 In a regular message, true if the sender has requested your | |
210 attention (only implemented for MUC currently) | |
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211 * delayed - message timestamp (ISO-8601 string) or empty string if |
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212 the message wasn't delayed |
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213 - hook-message-out (HOOK_MESSAGE_OUT) with parameters |
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214 * jid - recipient of the outgoing message |
1830 | 215 * message - message body, converted to locale charset |
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216 - hook-status-change (HOOK_STATUS_CHANGE) with |
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217 parameters |
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218 * jid - buddy, whose status has changed |
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219 * resource - resource, whose status has changed |
1830 | 220 * old_status - old status of the buddy, one-char string, |
221 representing mcabber status letter - one of 'ofdna?_'. | |
222 * new_status - new buddy status. Same as above. | |
223 * message - new status message. Old one should still be | |
224 available to module as the current buddy's message. | |
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225 - hook-my-status-change (HOOK_MY_STATUS_CHANGE) with |
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226 parameters |
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227 * new_status - user's new status, see |
1830 | 228 hook-status-change. Old one should still be |
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229 available as the current status of the user. |
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230 * message - new status message |
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231 - hook-post-connect (HOOK_POST_CONNECT) with no parameters |
1830 | 232 - hook-pre-disconnect (HOOK_PRE_DISCONNECT) with no parameters |
233 - hook-unread-list-change (HOOK_UNREAD_LIST_CHANGE) | |
234 * unread - number of buffers with the pending message flag (#) | |
235 * attention - number of non-MUC buffers with the attention sign (!) | |
236 * muc_unread - number of MUC buffers with the unread message flag | |
237 * muc_attention - number of MUC buffers with the attention sign | |
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238 |
1830 | 239 |
240 ------------------------------------------------------------------------ | |
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241 #include <mcabber/xmpp_helper.h> |
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242 |
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243 void xmpp_add_feature (const char *xmlns); |
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244 void xmpp_del_feature (const char *xmlns); |
1830 | 245 ------------------------------------------------------------------------ |
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246 |
1830 | 247 These functions may be useful, if your module implements some additional |
248 functionality to mcabber, that should be advertised in a client's | |
249 discovery features list. | |
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250 |
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251 ===================== |
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252 |
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253 Example: hello |
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254 |
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255 ===================== |
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256 |
1830 | 257 Now, let's write a simple module, called "hello", that will do no more |
258 than just print something on loading and unloading. | |
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259 |
1830 | 260 ------------------------------------------------------------------------ |
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261 #include <glib.h> |
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262 #include <gmodule.h> |
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263 |
1830 | 264 /* We will use scr_log_print() mcabber function, |
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265 that does mcabber's messages output */ |
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266 #include <mcabber/logprint.h> |
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267 |
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268 /* Print something on module loading */ |
1830 | 269 const gchar* g_module_check_init(GModule *module) |
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270 { |
1830 | 271 scr_log_print(LPRINT_NORMAL, "Hello, World!"); |
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272 return NULL; |
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273 } |
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274 |
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275 /* ... and unloading */ |
1830 | 276 void g_module_unload(GModule *module) |
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277 { |
1830 | 278 scr_log_print(LPRINT_NORMAL, "Bye, World!"); |
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279 } |
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280 |
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281 /* The End */ |
1830 | 282 ------------------------------------------------------------------------ |
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283 |
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284 Now, compile this file (hello.c) with |
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285 |
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286 libtool --mode=compile gcc `pkg-config --cflags glib-2.0 \ |
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287 gmodule-2.0 mcabber` -c hello.c |
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288 libtool --mode=link gcc -module -rpath /usr/lib/mcabber/ \ |
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289 `pkg-config --libs glib-2.0 gmodule-2.0 mcabber` \ |
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290 -o libhello.la hello.lo |
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291 |
1830 | 292 (you should substitute /usr/lib/mcabber to the directory where |
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293 your modules are located) and then install obtained module with |
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294 |
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295 libtool --mode=install install libhello.la \ |
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296 /usr/lib/mcabber/libhello.la |
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297 |
1830 | 298 Note that you most likely need not run suggested by libtool finish |
299 action, as we're working with module object, not system- wide library, | |
300 but maybe some systems require that. | |
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301 |
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302 Now, set modules_dir mcabber variable to point to your modules |
1830 | 303 directory, and try to run /module -f load hello. If all goes well, |
304 you should see in status buffer message "Hello World!" (as well as | |
305 some complaints, as we forced module loading). | |
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306 Now unload module by running command /module unload hello, |
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307 that should bring up message "Bye, World!". |
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308 |
1830 | 309 That's it, you just created very simple dynamically loadable mcabber |
310 module. But, as you noticed, it needs force to be loaded. Now, let's | |
311 add the information structure that mcabber wants. | |
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312 |
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313 ========================== |
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314 |
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315 Example: info struct |
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316 |
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317 ========================== |
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318 |
1830 | 319 ------------------------------------------------------------------------ |
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320 #include <mcabber/logprint.h> |
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321 /* module_info_t definition */ |
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322 #include <mcabber/modules.h> |
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323 |
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324 /* Print something on module loading */ |
1830 | 325 void hello_init(void) |
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326 { |
1830 | 327 scr_log_print(LPRINT_NORMAL, "Hello, World!"); |
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328 } |
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329 |
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330 /* ... and unloading */ |
1830 | 331 void hello_uninit(void) |
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332 { |
1830 | 333 scr_log_print(LPRINT_NORMAL, "Bye, World!"); |
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334 } |
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335 |
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336 module_info_t info_hello = { |
1752 | 337 .branch = "dev", |
338 .api = 1, | |
1830 | 339 .version = "0.0.1", |
340 .description = "Hello world module\n" | |
341 " (as well as bye world module)", | |
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342 .requires = NULL, |
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343 .init = hello_init, |
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344 .uninit = hello_uninit, |
1752 | 345 .next = NULL, |
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346 }; |
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347 |
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348 /* The End */ |
1830 | 349 ------------------------------------------------------------------------ |
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350 |
1830 | 351 Here we still do not use glib nor gmodule, so, we can omit them in |
352 compilation lines: | |
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353 |
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354 libtool --mode=compile gcc `pkg-config --cflags mcabber` \ |
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355 -c hello.c |
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356 libtool --mode=link gcc -module -rpath /usr/lib/mcabber/ \ |
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357 `pkg-config --libs mcabber` -o libhello.la hello.lo |
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358 |
1830 | 359 Again compile it, copy, and try to load, now without -f flag. As you |
360 may notice, when loading previous example, mcabber first printed "Hello, | |
361 World!", and only then complaint about module not having information | |
362 struct. That's because g_module_check_init is called right after module | |
363 loading, before mcabber even has a chance to look at module, while .init | |
364 from info struct is called afterwards by mcabber itself. You can try to | |
365 introduce some error (e.g. too high or missing target mcabber version) | |
366 and see the difference. | |
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367 |
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368 ======================= |
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369 |
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370 Example: command |
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371 |
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372 ======================= |
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373 |
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374 Now, let's allow our module to do some real work. |
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375 |
1830 | 376 ------------------------------------------------------------------------ |
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377 #include <mcabber/logprint.h> |
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378 #include <mcabber/commands.h> |
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379 #include <mcabber/modules.h> |
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380 |
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381 /* Handler for command */ |
1830 | 382 void do_hello(char *args) |
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383 { |
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384 /* args contains command line with command |
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385 * name and any spaces after it stripped */ |
1830 | 386 scr_log_print(LPRINT_NORMAL, "Hello, %s!", |
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387 *args != '\0' ? args : "World"); |
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388 } |
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389 |
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390 /* Register command */ |
1830 | 391 void hello_init(void) |
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392 { |
1830 | 393 cmd_add("hello", "", 0, 0, do_hello, NULL); |
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394 } |
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395 |
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396 /* Unregister command */ |
1830 | 397 void hello_uninit(void) |
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398 { |
1830 | 399 cmd_del("hello"); |
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400 } |
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401 |
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402 module_info_t hello_info = { |
1752 | 403 .branch = "dev", |
404 .api = 1, | |
1830 | 405 .version = "0.0.2", |
406 .description = "Hello world module\n" | |
407 " Provides command /hello", | |
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408 .requires = NULL, |
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409 .init = hello_init, |
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410 .uninit = hello_uninit, |
1752 | 411 .next = NULL, |
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412 } |
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413 |
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414 /* The End */ |
1830 | 415 ------------------------------------------------------------------------ |
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416 |
1830 | 417 Now, compile it and try to load and run /hello with some arguments. |
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418 |
1830 | 419 Note, that we used one-argument version of command handler, as we have |
420 specified no userdata. | |
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421 |
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422 ========================== |
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423 |
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424 Example: completion |
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425 |
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426 ========================== |
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427 |
1830 | 428 Now let's investigate how to provide custom completion to your commands. |
429 You can as well use built-in completions, their IDs are listed in | |
430 compl.h. | |
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431 |
1830 | 432 ------------------------------------------------------------------------ |
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433 #include <mcabber/logprint.h> |
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434 #include <mcabber/commands.h> |
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435 #include <mcabber/modules.h> |
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436 #include <mcabber/compl.h> |
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437 |
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438 static guint hello_cid = 0; |
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439 |
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440 /* hello command handler */ |
1830 | 441 void do_hello(char *args) |
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442 { |
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443 /* If argument is provided, add it to |
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444 * completions list. */ |
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445 if (hello_cid && *args != '\0') |
1830 | 446 compl_add_category_word(hello_cid, |
447 args); | |
448 scr_log_print(LPRINT_NORMAL, "Hello, %s!", | |
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449 *args != '\0' ? args : "World"); |
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450 } |
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451 |
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452 /* Initialization */ |
1830 | 453 void hello_init(void) |
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454 { |
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455 /* Obtain handle for our completion |
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456 * category */ |
1830 | 457 hello_cid = compl_new_category(); |
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458 if (hello_cid) |
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459 /* Add known default word to |
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460 * completion list */ |
1830 | 461 compl_add_category_word(hello_cid, |
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462 "World"); |
1830 | 463 cmd_add("hello", "", hello_cid, 0, do_hello, |
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464 NULL); |
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465 } |
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466 |
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467 /* Deinitialization */ |
1830 | 468 void hello_uninit(void) |
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469 { |
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470 /* Give back category handle */ |
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471 if (hello_cid) |
1830 | 472 compl_del_category(hello_cid); |
473 cmd_del("hello"); | |
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474 } |
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475 |
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476 module_info_t hello_info = { |
1752 | 477 .branch = "dev", |
478 .api = 1, | |
1830 | 479 .version = "0.0.3", |
480 .description = "Hello world module" | |
481 " Provides command /hello with completion", | |
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482 .requires = NULL, |
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483 .init = hello_init, |
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484 .uninit = hello_uninit, |
1752 | 485 .next = NULL, |
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486 } |
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487 |
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488 /* The End */ |
1830 | 489 ------------------------------------------------------------------------ |
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490 |
1830 | 491 Now you can use completion for hello command. Note, that this code have |
492 some serious simplifications, made for simplicity reasons. For now, | |
493 compl_add_category_word does not checks, if word already exists in | |
494 completions list (although it is marked as TODO, so, some day it will), | |
495 so, we should check it ourselves. | |
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496 |
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497 ===================== |
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498 |
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499 Example: hooks |
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500 |
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501 ===================== |
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502 |
1830 | 503 Now let's implement our own beeper. Why may anyone wish to do this? |
504 I am not satisfied with default mcabber's builtin beeper flexibility. | |
505 I wanted beeping on any MUC conference message, not just the ones | |
506 directed to me. | |
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507 |
1830 | 508 ------------------------------------------------------------------------ |
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509 #include <string.h> |
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510 |
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511 #include <mcabber/logprint.h> |
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512 #include <mcabber/commands.h> |
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513 #include <mcabber/compl.h> |
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514 #include <mcabber/hooks.h> |
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515 #include <mcabber/screen.h> |
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516 #include <mcabber/settings.h> |
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517 #include <mcabber/module.h> |
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518 |
1830 | 519 static guint beep_cid = 0; /* Command completion category id */ |
520 static guint beep_hid = 0; /* Hook handler id */ | |
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521 |
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522 /* Event handler */ |
1830 | 523 static guint beep_hh(const gchar *hookname, hk_arg_t *args, |
524 gpointer userdata) | |
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525 { |
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526 /* Check if beeping is enabled */ |
1830 | 527 if (settings_opt_get_int("beep_enable")) |
528 scr_Beep(); /* *BEEP*! */ | |
529 | |
530 return HOOK_HANDLER_RESULT_ALLOW_MORE_HANDLERS; | |
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531 } |
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532 |
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533 /* beep command handler */ |
1830 | 534 static void do_beep(char *args) |
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535 { |
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536 /* Check arguments, and if recognized, |
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537 * set mcabber option accordingly */ |
1830 | 538 if (!strcmp(args, "enable") || |
539 !strcmp(args, "on") || | |
540 !strcmp(args, "yes") || | |
541 !strcmp(args, "1")) | |
542 settings_set(SETTINGS_TYPE_OPTION, | |
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543 "beep_enable", "1"); |
1830 | 544 else if (!strcmp(args, "disable") || |
545 !strcmp(args, "off") || | |
546 !strcmp(args, "no") || | |
547 !strcmp(args, "0")) | |
548 settings_set(SETTINGS_TYPE_OPTION, | |
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549 "beep_enable", "0"); |
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550 |
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551 /* Output current state, either if state is |
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552 * changed and if argument is not recognized */ |
1830 | 553 if (settings_opt_get_int("beep_enable")) |
554 scr_log_print(LPRINT_NORMAL, | |
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555 "Beep on messages is enabled"); |
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556 else |
1830 | 557 scr_log_print(LPRINT_NORMAL, |
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558 "Beep on messages is disabled"); |
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559 } |
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560 |
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561 /* Initialization */ |
1830 | 562 static void beep_init (void) |
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563 { |
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564 /* Create completions */ |
1830 | 565 beep_cid = compl_new_category(); |
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566 if (beep_cid) { |
1830 | 567 compl_add_category_word(beep_cid, "enable"); |
568 compl_add_category_word(beep_cid, "disable"); | |
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569 } |
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570 /* Add command */ |
1830 | 571 cmd_add("beep", "", beep_cid, 0, do_beep, NULL); |
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572 /* Add handler |
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573 * We are only interested in incoming message events |
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574 */ |
1830 | 575 beep_hid = hk_add_handler(beep_hh, HOOK_POST_MESSAGE_IN, |
576 G_PRIORITY_DEFAULT_IDLE, NULL); | |
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577 } |
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578 |
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579 /* Deinitialization */ |
1830 | 580 void beep_uninit(void) |
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581 { |
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582 /* Unregister event handler */ |
1830 | 583 hk_del_handler(HOOK_POST_MESSAGE_IN, beep_hid); |
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584 /* Unregister command */ |
1830 | 585 cmd_del("beep"); |
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586 /* Give back completion handle */ |
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587 if (beep_cid) |
1830 | 588 compl_del_category(beep_cid); |
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589 } |
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590 |
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591 module_info_t beep_info = { |
1752 | 592 .branch = "dev", |
593 .api = 1, | |
1830 | 594 .version = "0.0.1", |
595 .description = "Simple beeper module\n" | |
596 " Recognizes option beep_enable\n" | |
597 " Provides command /beep", | |
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598 .requires = NULL, |
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599 .init = beep_init, |
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600 .uninit = beep_uninit, |
1752 | 601 .next = NULL, |
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602 } |
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603 |
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604 /* The End */ |
1830 | 605 ------------------------------------------------------------------------ |
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606 |
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607 If you use CMake (as do I), corresponding CMakeLists.txt |
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608 snippet: |
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609 |
1830 | 610 ------------------------------------------------------------------------ |
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611 cmake_minimum_required(VERSION 2.6) |
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612 project(beep C) |
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613 |
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614 find_package(PkgConfig REQUIRED) |
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615 pkg_check_modules(MCABBER REQUIRED mcabber) |
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616 # this one should be before any target definitions |
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617 link_directories(${MCABBER_LIBRARY_DIRS}) |
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618 |
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619 add_library(beep MODULE beep.c) |
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620 |
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621 include_directories(SYSTEM ${MCABBER_INCLUDE_DIRS}) |
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622 target_link_libraries(beep ${MCABBER_LIBRARIES) |
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623 include_directories(${beep_SOURCE_DIR} |
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624 ${beep_BINARY_DIR}) |
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625 |
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626 install(TARGETS beep DESTINATION lib/mcabber) |
1830 | 627 ------------------------------------------------------------------------ |
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628 |
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629 =========================== |
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630 |
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631 Example: dependencies |
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632 |
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633 =========================== |
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634 |
1830 | 635 I will not provide here a complete example of two modules, one of which |
636 depends on other, only some use cases. | |
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637 |
1830 | 638 Info struct for module, that depends on two other modules: |
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639 |
1830 | 640 ------------------------------------------------------------------------ |
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641 #include <mcabber/modules.h> |
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642 |
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643 const gchar *a_deps[] = { "b", "c", NULL }; |
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644 |
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645 module_info_t info_a = { |
1752 | 646 .branch = "dev", |
647 .api = 1, | |
1830 | 648 .version = NULL, |
649 .description = NULL, | |
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650 .requires = a_deps, |
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651 .init = a_init, |
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652 .uninit = a_uninit, |
1752 | 653 .next = NULL, |
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654 }; |
1830 | 655 ------------------------------------------------------------------------ |
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656 |
1830 | 657 If your module needs to "authenticate" mcabber version too, this can be |
658 done in g_module_check_init: | |
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659 |
1830 | 660 ------------------------------------------------------------------------ |
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661 #include <glib.h> |
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662 #include <gmodule.h> |
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663 |
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664 #include <mcabber/main.h> |
1752 | 665 #include <mcabber/modules.h> |
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666 |
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667 const gchar *g_module_check_init (GModule *module) |
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668 { |
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669 char *ver = mcabber_version (); |
1752 | 670 // ver now contains version in format |
671 // X.X.X[-xxx][ (XXXXXXXXXXXXX)] | |
672 const gchar *branch = mcabber_branch; | |
673 guint api = mcabber_api_version; | |
674 const gchar *error = NULL; | |
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675 |
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676 if (...) |
1752 | 677 error = "Incompatible mcabber version"; |
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678 |
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679 g_free (ver); |
1752 | 680 return error; |
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681 } |
1830 | 682 ------------------------------------------------------------------------ |
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683 |
1830 | 684 Also you can use glib check_init routine to modify module information, |
685 that will be checked by mcabber, e.g. if you want your module to always | |
686 pass mcabber version check, you can assign branch information, obtained | |
687 from mcabber_... variables to corresponding fields in your struct. | |
688 Or you can modify your module's dependencies, though direct | |
689 module_load() will have the same effect, and can be used for optional | |
690 dependencies, that your module can still work without. | |
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691 |
1830 | 692 Note: remember, that g_module_check_init will be always called, even if |
693 later the module will not pass checks, thus: | |
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694 - do not use functions from other modules there; |
1830 | 695 - provide g_module_unload to undo anything, check_init has done. |
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696 |
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697 ============== |
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698 |
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699 Further |
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700 |
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701 ============== |
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702 |
1830 | 703 As mcabber now uses glib mainloop, you can use glib's event sources, for |
704 example, fifo reading already uses GIOChannels for non-blocking IO. | |
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705 |
1830 | 706 You can extend XMPP part of mcabber functionality by providing lm |
707 message handlers with high priority and allowing unhandled by your | |
708 handler messages be taken care by mcabber's handlers on normal priority | |
709 level. This is where you may need to modify set of advertised supported | |
710 disco features. | |
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711 |
1830 | 712 Many useful examples can be found in my modules, that can be found at |
713 http://isbear.unixzone.org.ua/source. | |
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714 |
1830 | 715 If you think, that your module needs to change something, hardcoded in |
716 current implementation - feel free to mail me or join mcabber's MUC room | |
717 and discuss it - for now we have only implemented things, that we have | |
718 found necessary for our own modules. | |
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719 |
1830 | 720 Also I am not native English speaker, so, if you find some errors or |
721 non-natural constructs in this howto, please, inform me (I will be glad, | |
722 if you also provide a more suitable version of text in question). | |
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723 |
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724 -- Myhailo Danylenko |
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725 -- mailto:isbear@ukrpost.net |
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726 -- xmpp:isbear@unixzone.org.ua |
1830 | 727 -- Sat, 27 Mar 2010 13:30:00 +0100 |
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728 |