Pileus Git - lackey/blob - cals/ical.c

   1 /*
   2  * Copyright (C) 2012-2013 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #define _XOPEN_SOURCE
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <wordexp.h>
  23 #include <libical/ical.h>
  24
  25 #include "util.h"
  26 #include "conf.h"
  27 #include "date.h"
  28 #include "cal.h"
  29
  30 /* Local types */
  31 typedef struct {
  32         cal_t *cal;
  33         icalcomponent *comp;
  34         struct icaltimetype start;
  35         struct icaltimetype end;
  36 } ical_inst;
  37
  38 typedef struct ical_t {
  39         cal_t          cal;
  40         char          *location;
  41         char          *username;
  42         char          *password;
  43         icalcomponent *comp;
  44         struct ical_t *next;
  45 } ical_t;
  46
  47 /* Static data */
  48 static ical_t *calendars;
  49
  50 /* Helper functions */
  51 static int ical_compare(const void *_a, const void *_b)
  52 {
  53         const ical_inst *a = _a;
  54         const ical_inst *b = _b;
  55         int scomp = icaltime_compare(a->start, b->start);
  56         int ecomp = icaltime_compare(a->end,   b->end);
  57         return scomp != 0 ? scomp :
  58                ecomp != 0 ? ecomp : 0 ;
  59 }
  60
  61 static date_t to_date(struct icaltimetype time)
  62 {
  63         return (date_t){
  64                 .year  = time.year,
  65                 .month = time.month ? time.month-1 : 0,
  66                 .day   = time.day   ? time.day  -1 : 0,
  67                 .hour  = time.hour,
  68                 .min   = time.minute,
  69         };
  70 }
  71
  72 static icaltimetype to_itime(date_t time)
  73 {
  74         return (struct icaltimetype){
  75                 .year   = time.year,
  76                 .month  = time.month + 1,
  77                 .day    = time.day   + 1,
  78                 .hour   = time.hour,
  79                 .minute = time.min
  80         };
  81 }
  82
  83 static void add_recur(cal_t *cal,
  84                 icalarray *array, icalcomponent *comp,
  85                 icaltimetype start, icaltimetype end,
  86                 icalcomponent_kind which)
  87 {
  88         icalcomponent_kind kind = icalcomponent_isa(comp);
  89
  90         if (kind == which) {
  91                 /* Get recurrence data */
  92                 struct icaltimetype cstart, cend; // Component times
  93                 struct icaltimetype istart, iend; // Instance times
  94                 struct icaldurationtype length;   // Duration
  95
  96                 icalproperty             *rrule;
  97                 struct icalrecurrencetype recur;
  98                 icalrecur_iterator       *iter;
  99
 100                 cstart = icalcomponent_get_dtstart(comp);
 101                 cend   = icalcomponent_get_dtend(comp);
 102                 length = icaltime_subtract(cend, cstart);
 103
 104                 /* Full day event */
 105                 if (icaltime_is_null_time(cstart) ||
 106                     which == ICAL_VTODO_COMPONENT) {
 107                         icalarray_append(array, &(ical_inst){
 108                                 .cal   = cal,
 109                                 .comp  = comp,
 110                                 .start = cstart,
 111                                 .end   = cend,
 112                         });
 113                 }
 114
 115                 /* Add all recurrences */
 116                 rrule = icalcomponent_get_first_property(comp, ICAL_RRULE_PROPERTY);
 117
 118                 /* One-time event */
 119                 if (!rrule) {
 120                         icalarray_append(array, &(ical_inst){
 121                                 .cal   = cal,
 122                                 .comp  = comp,
 123                                 .start = cstart,
 124                                 .end   = cend,
 125                         });
 126                 }
 127
 128                 /* Recurring events */
 129                 while (rrule) {
 130                         recur = icalproperty_get_rrule(rrule);
 131                         iter  = icalrecur_iterator_new(recur, cstart);
 132
 133                         /* Add recurrence for this rrule */
 134                         while (1) {
 135                                 istart = iend = icalrecur_iterator_next(iter);
 136                                 if (icaltime_is_null_time(istart))
 137                                         break;    // no more instances
 138                                 if (!icaltime_is_null_time(cend))
 139                                         iend = icaltime_add(iend, length);
 140
 141                                 if (icaltime_compare(iend, start) <= 0)
 142                                         continue; // instance ends before start time
 143                                 if (icaltime_compare(istart, end) >= 0)
 144                                         break;    // instance begins after stop time
 145
 146                                 icalarray_append(array, &(ical_inst){
 147                                         .cal   = cal,
 148                                         .comp  = comp,
 149                                         .start = istart,
 150                                         .end   = iend,
 151                                 });
 152                         }
 153
 154                         icalrecur_iterator_free(iter);
 155                         rrule = icalcomponent_get_next_property(comp, ICAL_RRULE_PROPERTY);
 156                 }
 157         }
 158
 159         /* Add children */
 160         icalcomponent_kind find = ICAL_ANY_COMPONENT;
 161         icalcomponent *child = icalcomponent_get_first_component(comp, find);
 162         while (child) {
 163                 add_recur(cal, array, child, start, end, which);
 164                 child = icalcomponent_get_next_component(comp, find);
 165         }
 166 }
 167
 168 static void read_icals(void)
 169 {
 170         for (ical_t *cal = calendars; cal; cal = cal->next) {
 171                 if (!cal->location)
 172                         debug("Missing location for ical '%s'", cal->cal.name);
 173                 if (cal->comp)
 174                         continue;
 175                 wordexp_t wexp;
 176                 wordexp(cal->location, &wexp, WRDE_NOCMD);
 177                 icalparser *parser = icalparser_new();
 178                 if (wexp.we_wordc > 1)
 179                         debug("Multiple calendards are not supported '%s'", cal->location);
 180                 FILE *file = fopen(wexp.we_wordv[0], "r");
 181                 if (!file) {
 182                         debug("Cannot open ical file '%s'", wexp.we_wordv[0]);
 183                 } else {
 184                         icalparser_set_gen_data(parser, file);
 185                         cal->comp = icalparser_parse(parser, (void*)fgets);
 186                         icalparser_free(parser);
 187                 }
 188                 wordfree(&wexp);
 189         }
 190 }
 191
 192 /* Event functions */
 193 static event_t *to_event(ical_inst *inst)
 194 {
 195         icalproperty *prop = icalcomponent_get_first_property(inst->comp, ICAL_CATEGORIES_PROPERTY);
 196
 197         event_t *event = new0(event_t);
 198         event->name  = strcopy(icalcomponent_get_summary(inst->comp));
 199         event->desc  = strcopy(icalcomponent_get_description(inst->comp));
 200         event->loc   = strcopy(icalcomponent_get_location(inst->comp));
 201         event->cat   = icalproperty_get_value_as_string_r(prop);
 202         event->start = to_date(inst->start);
 203         event->end   = to_date(inst->end);
 204         event->cal   = inst->cal;
 205         return event;
 206 }
 207
 208 static event_t *to_events(icalarray *array)
 209 {
 210         event_t  list = {};
 211         event_t *tail = &list;
 212         for (int i = 0; i < array->num_elements; i++) {
 213                  ical_inst *inst = icalarray_element_at(array, i);
 214                  tail->next = to_event(inst);
 215                  tail = tail->next;
 216         }
 217         return list.next;
 218 }
 219
 220 static void print_events(event_t *start)
 221 {
 222         for (event_t *cur = start; cur; cur = cur->next)
 223                 printf("%04d-%02d-%02d %02d:%02d - %s\n",
 224                         cur->start.year, cur->start.month, cur->start.day,
 225                         cur->start.hour, cur->start.min,
 226                         cur->name ?: cur->desc ?: "[no summary]");
 227 }
 228
 229 /* Todo functions */
 230 static todo_t *to_todo(ical_inst *inst)
 231 {
 232         icalproperty *cat  = icalcomponent_get_first_property(inst->comp, ICAL_CATEGORIES_PROPERTY);
 233         icalproperty *perc = icalcomponent_get_first_property(inst->comp, ICAL_PERCENTCOMPLETE_PROPERTY);
 234
 235         todo_t *todo = new0(todo_t);
 236         todo->name   = strcopy(icalcomponent_get_summary(inst->comp));
 237         todo->desc   = strcopy(icalcomponent_get_description(inst->comp));
 238         todo->cat    = strcopy(icalproperty_get_value_as_string(cat));
 239         todo->status = icalcomponent_get_status(inst->comp) == ICAL_STATUS_COMPLETED ? 100 :
 240                        perc ? icalproperty_get_percentcomplete(perc) : 0;
 241         todo->start  = to_date(inst->start);
 242         todo->due    = to_date(icalcomponent_get_due(inst->comp));
 243         todo->cal    = inst->cal;
 244         return todo;
 245 }
 246
 247 static todo_t *to_todos(icalarray *array)
 248 {
 249         todo_t  list = {};
 250         todo_t *tail = &list;
 251         for (int i = 0; i < array->num_elements; i++) {
 252                  ical_inst *inst = icalarray_element_at(array, i);
 253                  tail->next = to_todo(inst);
 254                  tail = tail->next;
 255         }
 256         return list.next;
 257 }
 258
 259 static void print_todos(todo_t *start)
 260 {
 261         for (todo_t *cur = start; cur; cur = cur->next)
 262                 printf("%04d-%02d-%02d %02d:%02d - %d%% - %s\n",
 263                         cur->due.year, cur->due.month, cur->due.day,
 264                         cur->due.hour, cur->due.min,   cur->status,
 265                         cur->name ?: cur->desc ?: "[no summary]");
 266 }
 267
 268 /* Config parser */
 269 void ical_config(const char *group, const char *name, const char *key, const char *value)
 270 {
 271         ical_t *cal = NULL, *last = NULL;
 272
 273         /* Make sure it's valid */
 274         if (!match(group, "ical") || !name)
 275                 return;
 276
 277         /* Find existing calendar */
 278         for (cal = calendars; cal; last = cal, cal = cal->next)
 279                 if (match(cal->cal.name, name))
 280                         break;
 281
 282         /* Create new calendar */
 283         if (!cal) {
 284                 cal = new0(ical_t);
 285                 cal->cal.type = "ical";
 286                 cal->cal.name = get_name(name);
 287                 if (last)
 288                         last->next = cal;
 289                 else
 290                         calendars = cal;
 291                 return;
 292         }
 293
 294         /* Set calendar values */
 295         if (match(key, "location"))
 296                 cal->location = get_string(value);
 297         else if (match(key, "username"))
 298                 cal->username = get_string(value);
 299         else if (match(key, "password"))
 300                 cal->password = get_string(value);
 301 }
 302
 303 /* Cal functions */
 304 cal_t *ical_cals(void)
 305 {
 306         read_icals();
 307
 308         for (ical_t *cal = calendars; cal; cal = cal->next)
 309                 cal->cal.next = &cal->next->cal;
 310
 311         return &calendars->cal;
 312 }
 313
 314 /* Event functions */
 315 event_t *ical_events(date_t _start, date_t _end)
 316 {
 317         read_icals();
 318
 319         icaltimetype start = to_itime(_start);
 320         icaltimetype end   = to_itime(_end);
 321         icalarray *array = icalarray_new(sizeof(ical_inst), 1);
 322         for (ical_t *cal = calendars; cal; cal = cal->next)
 323                 add_recur(&cal->cal, array, cal->comp, start, end, ICAL_VEVENT_COMPONENT);
 324         icalarray_sort(array, ical_compare);
 325         event_t *events = to_events(array);
 326         icalarray_free(array);
 327
 328         return events;
 329 }
 330
 331 /* Todo functions */
 332 todo_t *ical_todos(date_t _start, date_t _end)
 333 {
 334         read_icals();
 335
 336         icaltimetype start = to_itime(_start);
 337         icaltimetype end   = to_itime(_end);
 338         icalarray *array = icalarray_new(sizeof(ical_inst), 1);
 339         for (ical_t *cal = calendars; cal; cal = cal->next)
 340                 add_recur(&cal->cal, array, cal->comp, start, end, ICAL_VTODO_COMPONENT);
 341         icalarray_sort(array, ical_compare);
 342         todo_t *todos = to_todos(array);
 343         icalarray_free(array);
 344
 345         return todos;
 346 }
 347
 348 /* Test functions */
 349 void ical_printr(icalcomponent *comp, int depth)
 350 {
 351         /* Print component */
 352         icalcomponent_kind kind = icalcomponent_isa(comp);
 353         printf("%*s", depth, "");
 354         printf("%s",  icalcomponent_kind_to_string(kind));
 355         if (kind == ICAL_VEVENT_COMPONENT ||
 356             kind == ICAL_VTODO_COMPONENT)
 357                 printf(" - %s", icalcomponent_get_summary(comp) ?: "[no summary]");
 358         printf("\n");
 359
 360         /* Print children */
 361         icalcomponent_kind find = ICAL_ANY_COMPONENT;
 362         icalcomponent *child = icalcomponent_get_first_component(comp, find);
 363         while (child) {
 364                 ical_printr(child, depth+2);
 365                 child = icalcomponent_get_next_component(comp, find);
 366         }
 367 }
 368
 369 void ical_test(char *path)
 370 {
 371         /* Load ical */
 372         FILE *file = fopen(path, "r");
 373         icalparser *parser = icalparser_new();
 374         icalparser_set_gen_data(parser, file);
 375         icalcomponent *comp = icalparser_parse(parser, (void*)fgets);
 376
 377         /* Misc */
 378         icalarray *array;
 379         icaltimetype start = {.year = 2000};
 380         icaltimetype end   = {.year = 2020};
 381
 382         /* Find events */
 383         array = icalarray_new(sizeof(ical_inst), 1);
 384         add_recur(NULL, array, comp, start, end, ICAL_VEVENT_COMPONENT);
 385         icalarray_sort(array, ical_compare);
 386         event_t *events = to_events(array);
 387         icalarray_free(array);
 388
 389         /* Find Todos */
 390         array = icalarray_new(sizeof(ical_inst), 1);
 391         add_recur(NULL, array, comp, start, end, ICAL_VTODO_COMPONENT);
 392         icalarray_sort(array, ical_compare);
 393         todo_t *todos = to_todos(array);
 394         icalarray_free(array);
 395
 396         /* Print */
 397         ical_printr(comp, 0);
 398         print_events(events);
 399         print_todos(todos);
 400
 401         (void)print_events;
 402         (void)print_todos;
 403         (void)events;
 404         (void)todos;
 405
 406         /* Cleanup */
 407         icalparser_free(parser);
 408 }