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	ics2tree.c - ics2txt - convert icalendar .ics file to plain text
	git clone git://bitreich.org/ics2txt git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws…
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	---
	ics2tree.c (1959B)
	---
	1 #include <unistd.h>
	2 #include <errno.h>
	3 #include <stdio.h>
	4 #include <stdlib.h>
	5 #include <string.h>
	6 #include <strings.h>
	7 #include "ical.h"
	8 #include "util.h"
	9
	10 #ifndef __OpenBSD__
	11 #define pledge(...) 0
	12 #endif
	13
	14 static void
	15 print_ruler(int level)
	16 {
	17 while (level-- > 0)
	18 fprintf(stdout, ": ");
	19 }
	20
	21 static int
	22 fn_field_name(IcalParser p, char name)
	23 {
	24 print_ruler(ical_get_level(p));
	25 printf("name %s\n", name);
	26 fflush(stdout);
	27 return 0;
	28 }
	29
	30 static int
	31 fn_block_begin(IcalParser p, char name)
	32 {
	33 print_ruler(ical_get_level(p) - 1);
	34 printf("begin %s\n", name);
	35 fflush(stdout);
	36 return 0;
	37 }
	38
	39 static int
	40 fn_param_value(IcalParser p, char name, char *value)
	41 {
	42 print_ruler(ical_get_level(p) + 1);
	43 printf("param %s=%s\n", name, value);
	44 fflush(stdout);
	45 return 0;
	46 }
	47
	48 static int
	49 fn_field_value(IcalParser p, char name, char *value)
	50 {
	51 size_t len;
	52 (void)name;
	53
	54 if (ical_get_value(p, value, &len) < 0)
	55 return -1;
	56 print_ruler(ical_get_level(p) + 1);
	57 if (strcasecmp(name, "DTSTART") == 0 \|\|
	58 strcasecmp(name, "DTSTAMP") == 0 \|\|
	59 strcasecmp(name, "DTEND") == 0) {
	60 time_t t;
	61 if (ical_get_time(p, value, &t) != 0)
	62 warn("%s: %s", p->errmsg, value);
	63 printf("epoch %lld\n", t);
	64 } else {
	65 printf("value %s\n", value);
	66 }
	67 fflush(stdout);
	68 return 0;
	69 }
	70
	71 int
	72 main(int argc, char **argv)
	73 {
	74 IcalParser p = {0};
	75 arg0 = *argv++;
	76
	77 if (pledge("stdio", "") < 0)
	78 err(1, "pledge: %s", strerror(errno));
	79
	80 p.fn_field_name = fn_field_name;
	81 p.fn_block_begin = fn_block_begin;
	82 p.fn_param_value = fn_param_value;
	83 p.fn_field_value = fn_field_value;
	84
	85 if (*argv == NULL) {
	86 if (ical_parse(&p, stdin) < 0)
	87 err(1, "parsing stdin:%d: %s", p.linenum, p.errm…
	88 }
	89
	90 for (; *argv != NULL; argv++, argc--) {
	91 FILE *fp;
	92
	93 debug("converting \"%s\"", *argv);
	94 if ((fp = fopen(*argv, "r")) == NULL)
	95 err(1, "opening %s", *argv);
	96 if (ical_parse(&p, fp) < 0)
	97 err(1, "parsing %s:%d: %s", *argv, p.linenum, p.…
	98 fclose(fp);
	99 }
	100 return 0;
	101 }