/*
 * Calcurse - text-based organizer
 *
 * Copyright (c) 2004-2012 calcurse Development Team <misc@calcurse.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the
 *        following disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the
 *        following disclaimer in the documentation and/or other
 *        materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Send your feedback or comments to : misc@calcurse.org
 * Calcurse home page : http://calcurse.org
 *
 */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <limits.h>
#include <getopt.h>
#include <time.h>
#include <regex.h>

#include "calcurse.h"

/* Long options */
enum {
  OPT_FMT_APT = 1000,
  OPT_FMT_RAPT,
  OPT_FMT_EV,
  OPT_FMT_REV,
  OPT_FMT_TODO,
  OPT_READ_ONLY
};

/*
 * Print Calcurse usage and exit.
 */
static void usage(void)
{
  const char *arg_usage =
      _("Usage: calcurse [-g|-h|-v] [-an] [-t[num]] [-i<file>] [-x[format]]\n"
        "                [-d <date>|<num>] [-s[date]] [-r[range]]\n"
        "                [-c<file> | -D<dir>] [-S<regex>] [--status]\n"
        "                [--read-only]\n");
  fputs(arg_usage, stdout);
}

static void usage_try(void)
{
  const char *arg_usage_try = _("Try 'calcurse -h' for more information.\n");
  fputs(arg_usage_try, stdout);
}

/*
 * Print Calcurse version with a short copyright text and exit.
 */
static void version_arg(void)
{
  const char *vtext =
      _("\nCopyright (c) 2004-2012 calcurse Development Team.\n"
        "This is free software; see the source for copying conditions.\n");

  fprintf(stdout, _("Calcurse %s - text-based organizer\n"), VERSION);
  fputs(vtext, stdout);
}

static void more_info(void)
{
  fputs(_("\nFor more information, type '?' from within Calcurse, "
          "or read the manpage.\n"), stdout);
  fputs(_("Mail feature requests and suggestions to <misc@calcurse.org>.\n"),
        stdout);
  fputs(_("Mail bug reports to <bugs@calcurse.org>.\n"), stdout);
}

/*
 * Print the command line options and exit.
 */
static void help_arg(void)
{
  const char *htext =
      _("\nMiscellaneous:\n"
        "  -h, --help\n"
        "	print this help and exit.\n"
        "\n  -v, --version\n"
        "	print calcurse version and exit.\n"
        "\n  --status\n"
        "	display the status of running instances of calcurse.\n"
        "\n  --read-only\n"
        "	Don't save configuration nor appointments/todos. Use with care.\n"
        "\nFiles:\n"
        "  -c <file>, --calendar <file>\n"
        "	specify the calendar <file> to use (incompatible with '-D').\n"
        "\n  -D <dir>, --directory <dir>\n"
        "	specify the data directory to use (incompatible with '-c').\n"
        "\tIf not specified, the default directory is ~/.calcurse\n"
        "\nNon-interactive:\n"
        "  -a, --appointment\n"
        " 	print events and appointments for current day and exit.\n"
        "\n  -d <date|num>, --day <date|num>\n"
        "	print events and appointments for <date> or <num> upcoming days and"
        "\n\texit. To specify both a starting date and a range, use the\n"
        "\t'--startday' and the '--range' option.\n"
        "\n  -g, --gc\n"
        "	run the garbage collector for note files and exit. \n"
        "\n  -i <file>, --import <file>\n"
        "	import the icalendar data contained in <file>. \n"
        "\n  -n, --next\n"
        "	print next appointment within upcoming 24 hours "
        "and exit. Also given\n\tis the remaining time before this "
        "next appointment.\n"
        "\n  -r[num], --range[=num]\n"
        "	print events and appointments for the [num] number of days"
        "\n\tand exit. If no [num] is given, a range of 1 day is considered.\n"
        "\n  -s[date], --startday[=date]\n"
        "	print events and appointments from [date] and exit.\n"
        "\tIf no [date] is given, the current day is considered.\n"
        "\n  -S<regex>, --search=<regex>\n"
        "	search for the given regular expression within events, appointments,\n"
        "\tand todos description.\n"
        "\n  -t[num], --todo[=num]\n"
        "	print todo list and exit. If the optional number [num] is given,\n"
        "\tthen only todos having a priority equal to [num] will be returned.\n"
        "\tThe priority number must be between 1 (highest) and 9 (lowest).\n"
        "\tIt is also possible to specify '0' for the priority, in which case\n"
        "\tonly completed tasks will be shown.\n"
        "\n  -x[format], --export[=format]\n"
        "	export user data to the specified format. Events, appointments and\n"
        "\ttodos are converted and echoed to stdout.\n"
        "\tTwo possible formats are available: 'ical' and 'pcal'.\n"
        "\tIf the optional argument format is not given, ical format is\n"
        "\tselected by default.\n"
        "\tnote: redirect standard output to export data to a file,\n"
        "\tby issuing a command such as: calcurse --export > calcurse.dat\n");

  fprintf(stdout, _("Calcurse %s - text-based organizer\n"), VERSION);
  usage();
  fputs(htext, stdout);
  more_info();
}

/*
 * Used to display the status of running instances of calcurse.
 * The displayed message will look like one of the following ones:
 *
 *   calcurse is running (pid #)
 *   calcurse is running in background (pid #)
 *   calcurse is not running
 *
 * The status is obtained by looking at pid files in user data directory
 * (.calcurse.pid and .daemon.pid).
 */
static void status_arg(void)
{
  int cpid, dpid;

  cpid = io_get_pid(path_cpid);
  dpid = io_get_pid(path_dpid);

  EXIT_IF(cpid && dpid,
          _("Error: both calcurse (pid: %d) and its daemon (pid: %d)\n"
            "seem to be running at the same time!\n"
            "Please check manually and restart calcurse.\n"), cpid, dpid);

  if (cpid)
    fprintf(stdout, _("calcurse is running (pid %d)\n"), cpid);
  else if (dpid)
    fprintf(stdout, _("calcurse is running in background (pid %d)\n"), dpid);
  else
    puts(_("calcurse is not running\n"));
}

/*
 * Print todo list and exit. If a priority number is given, then only todo
 * then only todo items that have this priority will be displayed.
 * If priority is < 0, all todos will be displayed.
 * If priority == 0, only completed tasks will be displayed.
 * If regex is not null, only the matching todos are printed.
 */
static void todo_arg(int priority, const char *format, regex_t * regex)
{
  llist_item_t *i;
  int title = 1;
  const char *titlestr;
  const char *all_todos_title = _("to do:\n");
  const char *completed_title = _("completed tasks:\n");

  titlestr = priority == 0 ? completed_title : all_todos_title;

#define DISPLAY_TITLE  do {                                             \
  if (title)                                                            \
    {                                                                   \
      fputs (titlestr, stdout);                                         \
      title = 0;                                                        \
    }                                                                   \
  } while (0)

  LLIST_FOREACH(&todolist, i) {
    struct todo *todo = LLIST_TS_GET_DATA(i);
    if (regex && regexec(regex, todo->mesg, 0, 0, 0) != 0)
      continue;

    if (todo->id < 0) {         /* completed task */
      if (priority == 0) {
        DISPLAY_TITLE;
        print_todo(format, todo);
      }
    } else {
      if (priority < 0 || todo->id == priority) {
        DISPLAY_TITLE;
        print_todo(format, todo);
      }
    }
  }

#undef DISPLAY_TITLE
}

/* Print the next appointment within the upcoming 24 hours. */
static void next_arg(void)
{
  struct notify_app next_app;
  const long current_time = now();
  int time_left, hours_left, min_left;

  next_app.time = current_time + DAYINSEC;
  next_app.got_app = 0;
  next_app.txt = NULL;

  next_app = *recur_apoint_check_next(&next_app, current_time, get_today());
  next_app = *apoint_check_next(&next_app, current_time);

  if (next_app.got_app) {
    time_left = next_app.time - current_time;
    hours_left = (time_left / HOURINSEC);
    min_left = (time_left - hours_left * HOURINSEC) / MININSEC;
    fputs(_("next appointment:\n"), stdout);
    fprintf(stdout, "   [%02d:%02d] %s\n", hours_left, min_left,
            next_app.txt);
    mem_free(next_app.txt);
  }
}

/*
 * Print the date on stdout.
 */
static void arg_print_date(long date)
{
  char date_str[BUFSIZ];
  time_t t;
  struct tm *lt;

  t = date;
  lt = localtime(&t);
  strftime(date_str, BUFSIZ, conf.output_datefmt, lt);
  fputs(date_str, stdout);
  fputs(":\n", stdout);
}

/*
 * Print appointments for given day and exit.
 * If no day is given, the given date is used.
 * If there is also no date given, current date is considered.
 * If regex is not null, only the matching appointments or events are printed.
 */
static int
app_arg(int add_line, struct date *day, long date, const char *fmt_apt,
        const char *fmt_rapt, const char *fmt_ev, const char *fmt_rev,
        regex_t * regex)
{
  llist_item_t *i, *j;
  long today;
  unsigned print_date = 1;
  int app_found = 0;

  if (date == 0)
    today = get_sec_date(*day);
  else
    today = date;

  /*
   * Calculate and print the selected date if there is an event for
   * that date and it is the first one, and then print all the events for
   * that date.
   */
  LLIST_FIND_FOREACH(&recur_elist, today, recur_event_inday, i) {
    struct recur_event *re = LLIST_GET_DATA(i);
    if (regex && regexec(regex, re->mesg, 0, 0, 0) != 0)
      continue;

    app_found = 1;
    if (add_line) {
      fputs("\n", stdout);
      add_line = 0;
    }
    if (print_date) {
      arg_print_date(today);
      print_date = 0;
    }
    print_recur_event(fmt_rev, today, re);
  }

  LLIST_FIND_FOREACH_CONT(&eventlist, today, event_inday, i) {
    struct event *ev = LLIST_TS_GET_DATA(i);
    if (regex && regexec(regex, ev->mesg, 0, 0, 0) != 0)
      continue;

    app_found = 1;
    if (add_line) {
      fputs("\n", stdout);
      add_line = 0;
    }
    if (print_date) {
      arg_print_date(today);
      print_date = 0;
    }
    print_event(fmt_ev, today, ev);
  }

  /* Same process is performed but this time on the appointments. */
  LLIST_TS_LOCK(&alist_p);
  LLIST_TS_LOCK(&recur_alist_p);

  /*
   * Iterate over regular appointments and recurrent ones simultaneously (fixes
   * http://lists.calcurse.org/bugs/msg00002.html).
   */
  i = LLIST_TS_FIND_FIRST(&alist_p, today, apoint_inday);
  j = LLIST_TS_FIND_FIRST(&recur_alist_p, today, recur_apoint_inday);
  while (i || j) {
    struct apoint *apt = LLIST_TS_GET_DATA(i);
    struct recur_apoint *ra = LLIST_TS_GET_DATA(j);
    unsigned occurrence;

    while (i && regex && regexec(regex, apt->mesg, 0, 0, 0) != 0) {
      i = LLIST_TS_FIND_NEXT(i, today, apoint_inday);
      apt = LLIST_TS_GET_DATA(i);
    }

    while (j && regex && regexec(regex, ra->mesg, 0, 0, 0) != 0) {
      j = LLIST_TS_FIND_NEXT(j, today, recur_apoint_inday);
      ra = LLIST_TS_GET_DATA(j);
    }

    if (apt && ra) {
      if (recur_apoint_find_occurrence(ra, today, &occurrence) &&
          apt->start <= occurrence)
        ra = NULL;
      else
        apt = NULL;
    }

    if (apt) {
      app_found = 1;
      if (add_line) {
        fputs("\n", stdout);
        add_line = 0;
      }
      if (print_date) {
        arg_print_date(today);
        print_date = 0;
      }
      print_apoint(fmt_apt, today, apt);
      i = LLIST_TS_FIND_NEXT(i, today, apoint_inday);
    } else if (ra) {
      app_found = 1;
      if (add_line) {
        fputs("\n", stdout);
        add_line = 0;
      }
      if (print_date) {
        arg_print_date(today);
        print_date = 0;
      }
      recur_apoint_find_occurrence(ra, today, &occurrence);
      print_recur_apoint(fmt_rapt, today, occurrence, ra);
      apt = NULL;
      j = LLIST_TS_FIND_NEXT(j, today, recur_apoint_inday);
    }
  }

  LLIST_TS_UNLOCK(&recur_alist_p);
  LLIST_TS_UNLOCK(&alist_p);

  return app_found;
}

/*
 * For a given date, print appointments for each day
 * in the chosen interval. app_found and add_line are used
 * to format the output correctly.
 */
static void
display_app(struct tm *t, int numdays, int add_line, const char *fmt_apt,
            const char *fmt_rapt, const char *fmt_ev, const char *fmt_rev,
            regex_t * regex)
{
  int i, app_found;
  struct date day;

  for (i = 0; i < numdays; i++) {
    day.dd = t->tm_mday;
    day.mm = t->tm_mon + 1;
    day.yyyy = t->tm_year + 1900;
    app_found = app_arg(add_line, &day, 0, fmt_apt, fmt_rapt, fmt_ev,
                        fmt_rev, regex);
    if (app_found)
      add_line = 1;
    t->tm_mday++;
    mktime(t);
  }
}

/*
 * Print appointment for the given date or for the given n upcoming
 * days.
 */
static void
date_arg(const char *ddate, int add_line, const char *fmt_apt,
         const char *fmt_rapt, const char *fmt_ev, const char *fmt_rev,
         regex_t * regex)
{
  int i;
  struct date day;
  int numdays = 0, num_digit = 0;
  int arg_len = 0;
  static struct tm t;
  time_t timer;

  /*
   * Check (with the argument length) if a date or a number of days
   * was entered, and then call app_arg() to print appointments
   */
  arg_len = strlen(ddate);
  if (arg_len <= 4) {           /* a number of days was entered */
    for (i = 0; i <= arg_len - 1; i++) {
      if (isdigit(ddate[i]))
        num_digit++;
    }
    if (num_digit == arg_len)
      numdays = atoi(ddate);

    /*
     * Get current date, and print appointments for each day
     * in the chosen interval. app_found and add_line are used
     * to format the output correctly.
     */
    timer = time(NULL);
    t = *localtime(&timer);
    display_app(&t, numdays, add_line, fmt_apt, fmt_rapt, fmt_ev, fmt_rev,
                regex);
  } else {                      /* a date was entered */
    if (parse_date(ddate, conf.input_datefmt, (int *)&day.yyyy,
                   (int *)&day.mm, (int *)&day.dd, NULL)) {
      app_arg(add_line, &day, 0, fmt_apt, fmt_rapt, fmt_ev, fmt_rev, regex);
    } else {
      fputs(_("Argument to the '-d' flag is not valid\n"), stderr);
      fprintf(stdout, _("Possible argument format are: '%s' or 'n'\n"),
               DATEFMT_DESC(conf.input_datefmt));
      more_info();
    }
  }
}

/*
 * Print appointment from the given date 'startday' for the 'range' upcoming
 * days.
 * If no starday is given (NULL), today is considered
 * If no range is given (NULL), 1 day is considered
 *
 * Many thanks to Erik Saule for providing this function.
 */
static void
date_arg_extended(const char *startday, const char *range, int add_line,
                  const char *fmt_apt, const char *fmt_rapt,
                  const char *fmt_ev, const char *fmt_rev, regex_t * regex)
{
  int i, numdays = 1, error = 0, arg_len = 0;
  static struct tm t;
  time_t timer;

  /*
   * Check arguments and extract information
   */
  if (range != NULL) {
    arg_len = strlen(range);
    for (i = 0; i <= arg_len - 1; i++) {
      if (!isdigit(range[i]))
        error = 1;
    }
    if (!error)
      numdays = atoi(range);
  }
  timer = time(NULL);
  t = *localtime(&timer);
  if (startday != NULL) {
    if (parse_date(startday, conf.input_datefmt, (int *)&t.tm_year,
                   (int *)&t.tm_mon, (int *)&t.tm_mday, NULL)) {
      t.tm_year -= 1900;
      t.tm_mon--;
      mktime(&t);
    } else {
      error = 1;
    }
  }
  if (!error) {
    display_app(&t, numdays, add_line, fmt_apt, fmt_rapt, fmt_ev, fmt_rev,
                regex);
  } else {
    fputs(_("Argument is not valid\n"), stderr);
    fprintf(stdout, _("Argument format for -s and --startday is: '%s'\n"),
             DATEFMT_DESC(conf.input_datefmt));
    fputs(_("Argument format for -r and --range is: 'n'\n"), stdout);
    more_info();
  }
}

/*
 * Parse the command-line arguments and call the appropriate
 * routines to handle those arguments. Also initialize the data paths.
 */
int parse_args(int argc, char **argv)
{
  int ch, add_line = 0;
  int unknown_flag = 0;
  /* Command-line flags */
  int aflag = 0;                /* -a: print appointments for current day */
  int cflag = 0;                /* -c: specify the calendar file to use */
  int dflag = 0;                /* -d: print appointments for a specified days */
  int Dflag = 0;                /* -D: specify data directory to use */
  int hflag = 0;                /* -h: print help text */
  int gflag = 0;                /* -g: run garbage collector */
  int iflag = 0;                /* -i: import data */
  int nflag = 0;                /* -n: print next appointment */
  int rflag = 0;                /* -r: specify the range of days to consider */
  int sflag = 0;                /* -s: specify the first day to consider */
  int Sflag = 0;                /* -S: specify a regex to search for */
  int tflag = 0;                /* -t: print todo list */
  int vflag = 0;                /* -v: print version number */
  int xflag = 0;                /* -x: export data */
  /* Format strings */
  const char *fmt_apt = " - %S -> %E\n\t%m\n";
  const char *fmt_rapt = " - %S -> %E\n\t%m\n";
  const char *fmt_ev = " * %m\n";
  const char *fmt_rev = " * %m\n";
  const char *fmt_todo = "%p. %m\n";

  int tnum = 0, xfmt = 0, non_interactive = 0, multiple_flag = 0, load_data = 0;
  const char *ddate = "", *cfile = NULL, *range = NULL, *startday = NULL;
  const char *datadir = NULL, *ifile = NULL;
  regex_t reg, *preg = NULL;

  /* Long options only */
  int statusflag = 0;           /* --status: get the status of running instances */
  enum {
    STATUS_OPT = CHAR_MAX + 1
  };

  static const char *optstr = "ghvnNax::t::d:c:r::s::S:D:i:";

  struct option longopts[] = {
    {"appointment", no_argument, NULL, 'a'},
    {"calendar", required_argument, NULL, 'c'},
    {"day", required_argument, NULL, 'd'},
    {"directory", required_argument, NULL, 'D'},
    {"gc", no_argument, NULL, 'g'},
    {"help", no_argument, NULL, 'h'},
    {"import", required_argument, NULL, 'i'},
    {"next", no_argument, NULL, 'n'},
    {"note", no_argument, NULL, 'N'},
    {"range", optional_argument, NULL, 'r'},
    {"startday", optional_argument, NULL, 's'},
    {"search", required_argument, NULL, 'S'},
    {"status", no_argument, NULL, STATUS_OPT},
    {"todo", optional_argument, NULL, 't'},
    {"version", no_argument, NULL, 'v'},
    {"export", optional_argument, NULL, 'x'},

    {"format-apt", required_argument, NULL, OPT_FMT_APT},
    {"format-recur-apt", required_argument, NULL, OPT_FMT_RAPT},
    {"format-event", required_argument, NULL, OPT_FMT_EV},
    {"format-recur-event", required_argument, NULL, OPT_FMT_REV},
    {"format-todo", required_argument, NULL, OPT_FMT_TODO},
    {"read-only", no_argument, NULL, OPT_READ_ONLY},
    {NULL, no_argument, NULL, 0}
  };

  while ((ch = getopt_long(argc, argv, optstr, longopts, NULL)) != -1) {
    switch (ch) {
    case STATUS_OPT:
      statusflag = 1;
      break;
    case 'a':
      aflag = 1;
      multiple_flag++;
      load_data++;
      break;
    case 'c':
      cflag = 1;
      multiple_flag++;
      cfile = optarg;
      load_data++;
      break;
    case 'd':
      dflag = 1;
      multiple_flag++;
      load_data++;
      ddate = optarg;
      break;
    case 'D':
      Dflag = 1;
      datadir = optarg;
      break;
    case 'h':
      hflag = 1;
      break;
    case 'g':
      gflag = 1;
      break;
    case 'i':
      iflag = 1;
      multiple_flag++;
      load_data++;
      ifile = optarg;
      break;
    case 'n':
      nflag = 1;
      multiple_flag++;
      load_data++;
      break;
    case 'r':
      rflag = 1;
      multiple_flag++;
      load_data++;
      range = optarg;
      break;
    case 's':
      sflag = 1;
      multiple_flag++;
      load_data++;
      startday = optarg;
      break;
    case 'S':
      EXIT_IF(Sflag > 0, _("Can not handle more than one regular expression."));
      Sflag = 1;
      if (regcomp(&reg, optarg, REG_EXTENDED))
        EXIT(_("Could not compile regular expression."));
      preg = &reg;
      break;
    case 't':
      tflag = 1;
      multiple_flag++;
      load_data++;
      add_line = 1;
      if (optarg != NULL) {
        tnum = atoi(optarg);
        if (tnum < 0 || tnum > 9) {
          usage();
          usage_try();
          return EXIT_FAILURE;
        }
      } else
        tnum = -1;
      break;
    case 'v':
      vflag = 1;
      break;
    case 'x':
      xflag = 1;
      multiple_flag++;
      load_data++;
      if (optarg != NULL) {
        if (strcmp(optarg, "ical") == 0)
          xfmt = IO_EXPORT_ICAL;
        else if (strcmp(optarg, "pcal") == 0)
          xfmt = IO_EXPORT_PCAL;
        else {
          fputs(_("Argument for '-x' should be either "
                  "'ical' or 'pcal'\n"), stderr);
          usage();
          usage_try();
          return EXIT_FAILURE;
        }
      } else {
        xfmt = IO_EXPORT_ICAL;
      }
      break;
    case OPT_FMT_APT:
      fmt_apt = optarg;
      break;
    case OPT_FMT_RAPT:
      fmt_rapt = optarg;
      break;
    case OPT_FMT_EV:
      fmt_ev = optarg;
      break;
    case OPT_FMT_REV:
      fmt_rev = optarg;
      break;
    case OPT_FMT_TODO:
      fmt_todo = optarg;
      break;
    case OPT_READ_ONLY:
      read_only = 1;
      break;
    default:
      usage();
      usage_try();
      unknown_flag = 1;
      non_interactive = 1;
      /* NOTREACHED */
    }
  }
  argc -= optind;

  if (argc >= 1) {
    usage();
    usage_try();
    return EXIT_FAILURE;
    /* Incorrect arguments */
  } else if (Dflag && cflag) {
    fputs(_("Options '-D' and '-c' cannot be used at the same time\n"), stderr);
    usage();
    usage_try();
    return EXIT_FAILURE;
  } else if (Sflag && !(aflag || dflag || rflag || sflag || tflag)) {
    fputs(_("Option '-S' must be used with either '-d', '-r', '-s', "
            "'-a' or '-t'\n"), stderr);
    usage();
    usage_try();
    return EXIT_FAILURE;
  } else {
    if (unknown_flag) {
      non_interactive = 1;
    } else if (hflag) {
      help_arg();
      non_interactive = 1;
    } else if (vflag) {
      version_arg();
      non_interactive = 1;
    } else if (statusflag) {
      io_init(cfile, datadir);
      status_arg();
      non_interactive = 1;
    } else if (gflag) {
      io_init(cfile, datadir);
      io_check_dir(path_dir, NULL);
      io_check_dir(path_notes, NULL);
      io_check_file(path_apts, NULL);
      io_check_file(path_todo, NULL);
      io_load_app();
      io_load_todo();
      note_gc();
      non_interactive = 1;
    } else if (multiple_flag) {
      if (load_data) {
        io_init(cfile, datadir);
        io_check_dir(path_dir, NULL);
        io_check_dir(path_notes, NULL);
      }
      if (iflag) {
        io_check_file(path_apts, NULL);
        io_check_file(path_todo, NULL);
        /* Get default pager in case we need to show a log file. */
        vars_init();
        io_load_app();
        io_load_todo();
        io_import_data(IO_IMPORT_ICAL, ifile);
        io_save_apts();
        io_save_todo();
        non_interactive = 1;
      }
      if (xflag) {
        io_check_file(path_apts, NULL);
        io_check_file(path_todo, NULL);
        io_load_app();
        io_load_todo();
        io_export_data(xfmt);
        non_interactive = 1;
        return non_interactive;
      }
      if (tflag) {
        io_check_file(path_todo, NULL);
        io_load_todo();
        todo_arg(tnum, fmt_todo, preg);
        non_interactive = 1;
      }
      if (nflag) {
        io_check_file(path_apts, NULL);
        io_load_app();
        next_arg();
        non_interactive = 1;
      }
      if (dflag || rflag || sflag) {
        io_check_file(path_apts, NULL);
        io_check_file(path_conf, NULL);
        io_load_app();
        config_load();          /* To get output date format. */
        if (dflag)
          date_arg(ddate, add_line, fmt_apt, fmt_rapt, fmt_ev, fmt_rev, preg);
        if (rflag || sflag)
          date_arg_extended(startday, range, add_line, fmt_apt,
                            fmt_rapt, fmt_ev, fmt_rev, preg);
        non_interactive = 1;
      } else if (aflag) {
        struct date day;

        io_check_file(path_apts, NULL);
        io_check_file(path_conf, NULL);
        vars_init();
        config_load();          /* To get output date format. */
        io_load_app();
        day.dd = day.mm = day.yyyy = 0;
        app_arg(add_line, &day, 0, fmt_apt, fmt_rapt, fmt_ev, fmt_rev, preg);
        non_interactive = 1;
      }
    } else {
      non_interactive = 0;
      io_init(cfile, datadir);
    }
  }

  if (preg)
    regfree(preg);

  return non_interactive;
}