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	first mockup of conversion - ics2txt - convert icalendar .ics file to plain text
	git clone git://bitreich.org/ics2txt git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws…
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	---
	commit 65778fa74c2e72ca67a8dc4f6c1f0021f8ce2de4
	parent 54ba66bb7b1b7eed7e3aaf60ef00c9ccc9cc65d6
	Author: Josuah Demangeon <[email protected]>
	Date: Thu, 17 Jun 2021 08:33:25 +0200

	first mockup of conversion

	Diffstat:
	M ical.c \| 16 +++++++++++-----
	M ics2tsv.c \| 16 ++++++++--------

	2 files changed, 19 insertions(+), 13 deletions(-)
	---
	diff --git a/ical.c b/ical.c
	@@ -154,16 +154,21 @@ hook_block_begin(IcalParser p, char name)
	}

	static int
	-hook_block_end(IcalParser p, char name)
	+hook_block_end_before(IcalParser p, char name)
	{
	if (p->current == p->stack)
	return ical_err(p, "more END: than BEGIN:");
	if (strcasecmp(p->current->name, name) != 0)
	return ical_err(p, "mismatching BEGIN: and END:");
	- p->current--;
	- if (p->current < p->stack)
	+ if (p->current <= p->stack)
	return ical_err(p, "more END: than BEGIN:");
	+ return 0;
	+}

	+static int
	+hook_block_end_after(IcalParser p, char name)
	+{
	+ p->current--;
	if (ical_block_name[p->blocktype] != NULL &&
	strcasecmp(ical_block_name[p->blocktype], name) == 0)
	p->blocktype = ICAL_BLOCK_OTHER;
	@@ -264,8 +269,9 @@ ical_parse_contentline(IcalParser p, char s)
	(err = CALL(p, fn_block_begin, s)) != 0)
	return err;
	} else if (strcasecmp(name, "END") == 0) {
	- if ((err = hook_block_end(p, s)) != 0 \|\|
	- (err = CALL(p, fn_block_end, s)) != 0)
	+ if ((err = hook_block_end_before(p, s)) != 0 \|\|
	+ (err = CALL(p, fn_block_end, s)) != 0 \|\|
	+ (err = hook_block_end_after(p, s)) != 0)
	return err;
	} else {
	if ((err = hook_field_value(p, name, s)) != 0 \|\|
	diff --git a/ics2tsv.c b/ics2tsv.c
	@@ -22,28 +22,29 @@ Block block;
	static int
	fn_field_name(IcalParser p, char name)
	{
	- printf("name %s\n", name);
	return 0;
	}

	static int
	fn_block_begin(IcalParser p, char name)
	{
	- debug("begin %s\n", name);
	+ memset(&block, 0, sizeof block);
	return 0;
	}

	static int
	fn_block_end(IcalParser p, char name)
	{
	- debug("end %s\n", name);
	+ if (p->blocktype == ICAL_BLOCK_OTHER)
	+ return 0;
	+ printf("%s\t%lld\t%lld", p->current->name, block.beg, block.end);
	+ printf("\n");
	return 0;
	}

	static int
	fn_param_value(IcalParser p, char name, char *value)
	{
	- printf("param %s=%s\n", name, value);
	return 0;
	}

	@@ -84,16 +85,15 @@ main(int argc, char **argv)
	p.fn_field_value = fn_field_value;

	if (*argv == NULL) {
	+ debug("converting stdin");
	if (ical_parse(&p, stdin) < 0)
	- err("parsing stdin:%d: %s", p.linenum, p.errmsg);
	+ err("parsing stdin:%d: %s", p.linenum, p.errmsg);
	}
	-
	for (; *argv != NULL; argv++, argc--) {
	FILE *fp;
	-
	debug("converting \"%s\"", *argv);
	if ((fp = fopen(*argv, "r")) == NULL)
	- err("opening %s", *argv);
	+ err("opening %s: %s", *argv, strerror(errno));
	if (ical_parse(&p, fp) < 0)
	err("parsing %s:%d: %s", *argv, p.linenum, p.errmsg);
	fclose(fp);