Move interaction functions to a separate file

This is a first step to clean up several compilation units and separate
the front end from back-end operations. All functions that require user
interaction are moved to a new compilation unit "interaction.c". Also,
following things are adjusted to the new layout:

* Make day_item_get_*() and a few other functions public, so that it can
  be accessed from the new compilation unit.

* Use apoint_hilt(), todo_hilt(), etc. instead of directly accessing
  static variables.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/apoint.c

@@ -135,150 +135,6 @@ struct apoint *apoint_new(char *mesg, char *note, long start, long dur,
   return apt;
 }
 
-/*
- * Add an item in either the appointment or the event list,
- * depending if the start time is entered or not.
- */
-void apoint_add(void)
-{
-#define LTIME 6
-#define LDUR 12
-  const char *mesg_1 =
-      _("Enter start time ([hh:mm]), leave blank for an all-day event : ");
-  const char *mesg_2 =
-      _
-      ("Enter end time ([hh:mm]) or duration ([+hh:mm], [+xxxdxxhxxm] or [+mm]) : ");
-  const char *mesg_3 = _("Enter description :");
-  const char *format_message_1 =
-      _("You entered an invalid start time, should be [hh:mm]");
-  const char *format_message_2 =
-      _
-      ("Invalid end time/duration, should be [hh:mm], [+hh:mm], [+xxxdxxhxxm] or [+mm]");
-  const char *enter_str = _("Press [Enter] to continue");
-  int Id = 1;
-  char item_time[LDUR] = "";
-  char item_mesg[BUFSIZ] = "";
-  long apoint_start;
-  unsigned heures, minutes;
-  unsigned apoint_duration;
-  unsigned end_h, end_m;
-  int is_appointment = 1;
-
-  /* Get the starting time */
-  for (;;) {
-    status_mesg(mesg_1, "");
-    if (getstring(win[STA].p, item_time, LTIME, 0, 1) != GETSTRING_ESC) {
-      if (strlen(item_time) == 0) {
-        is_appointment = 0;
-        break;
-      }
-
-      if (parse_time(item_time, &heures, &minutes) == 1)
-        break;
-      else {
-        status_mesg(format_message_1, enter_str);
-        wgetch(win[STA].p);
-      }
-    } else
-      return;
-  }
-
-  /*
-   * Check if an event or appointment is entered,
-   * depending on the starting time, and record the
-   * corresponding item.
-   */
-  if (is_appointment) {         /* Get the appointment duration */
-    item_time[0] = '\0';
-    for (;;) {
-      status_mesg(mesg_2, "");
-      if (getstring(win[STA].p, item_time, LDUR, 0, 1) != GETSTRING_ESC) {
-        if (*item_time == '+' && parse_duration(item_time + 1,
-                                                &apoint_duration) == 1)
-          break;
-        else if (parse_time(item_time, &end_h, &end_m) == 1) {
-          if (end_h < heures || ((end_h == heures) && (end_m < minutes))) {
-            apoint_duration = MININSEC - minutes + end_m
-                + (24 + end_h - (heures + 1)) * MININSEC;
-          } else {
-            apoint_duration = MININSEC - minutes
-                + end_m + (end_h - (heures + 1)) * MININSEC;
-          }
-          break;
-        } else {
-          status_mesg(format_message_2, enter_str);
-          wgetch(win[STA].p);
-        }
-      } else
-        return;
-    }
-  } else                        /* Insert the event Id */
-    Id = 1;
-
-  status_mesg(mesg_3, "");
-  if (getstring(win[STA].p, item_mesg, BUFSIZ, 0, 1) == GETSTRING_VALID) {
-    if (is_appointment) {
-      apoint_start = date2sec(*calendar_get_slctd_day(), heures, minutes);
-      apoint_new(item_mesg, 0L, apoint_start, min2sec(apoint_duration), 0L);
-      if (notify_bar())
-        notify_check_added(item_mesg, apoint_start, 0L);
-    } else
-      event_new(item_mesg, 0L, date2sec(*calendar_get_slctd_day(), 0, 0), Id);
-
-    if (hilt == 0)
-      hilt++;
-  }
-  wins_erase_status_bar();
-}
-
-/* Delete an item from the appointment list. */
-void apoint_delete(unsigned *nb_events, unsigned *nb_apoints)
-{
-  const char *del_app_str = _("Do you really want to delete this item ?");
-  long date;
-  int nb_items = *nb_apoints + *nb_events;
-  int to_be_removed = 0;
-
-  date = calendar_get_slctd_day_sec();
-
-  if (nb_items == 0)
-    return;
-
-  if (conf.confirm_delete) {
-    if (status_ask_bool(del_app_str) != 1) {
-      wins_erase_status_bar();
-      return;
-    }
-  }
-
-  if (nb_items != 0) {
-    switch (day_erase_item(date, hilt, ERASE_DONT_FORCE)) {
-    case EVNT:
-    case RECUR_EVNT:
-      (*nb_events)--;
-      to_be_removed = 1;
-      break;
-    case APPT:
-    case RECUR_APPT:
-      (*nb_apoints)--;
-      to_be_removed = 3;
-      break;
-    case 0:
-      return;
-    default:
-      EXIT(_("no such type"));
-      /* NOTREACHED */
-    }
-
-    if (hilt > 1)
-      hilt--;
-    if (apad.first_onscreen >= to_be_removed)
-      apad.first_onscreen = apad.first_onscreen - to_be_removed;
-    if (nb_items == 1)
-      hilt = 0;
-  }
-}
-
 /* Cut an item, so that it can be pasted somewhere else later. */
 int apoint_cut(unsigned *nb_events, unsigned *nb_apoints)
 {