From 926c2766b03c1fc09a5b5de08021d9ed048d821d Mon Sep 17 00:00:00 2001
From: Chloe Kudryavtsev <code@toast.bunkerlabs.net>
Date: Sat, 13 May 2023 10:56:58 -0400
Subject: add shortcuts for *time(mktime)

---
 src/date.h |  5 +++++
 src/tm.c   | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 76 insertions(+), 4 deletions(-)

diff --git a/src/date.h b/src/date.h
index 3661421..615b2bc 100644
--- a/src/date.h
+++ b/src/date.h
@@ -17,7 +17,12 @@ JANET_CFUN(jd_time);
 // tm.c
 extern const JanetRegExt jd_tm_cfuns[];
 struct tm *jd_gettm(Janet *argv, int32_t n);
+struct tm *jd_opttm(Janet *argv, int32_t argc, int32_t n);
 struct tm *jd_maketm(void);
 JANET_CFUN(jd_mktime);
 JANET_CFUN(jd_mktime_inplace);
+JANET_CFUN(jd_time_localtime);
+JANET_CFUN(jd_time_localtime_inplace);
+JANET_CFUN(jd_time_utc);
+JANET_CFUN(jd_time_utc_inplace);
 JANET_CFUN(jd_strftime);
diff --git a/src/tm.c b/src/tm.c
index d078def..6f245eb 100644
--- a/src/tm.c
+++ b/src/tm.c
@@ -4,10 +4,16 @@
 // wrappers around struct tm
 
 static JanetMethod jd_tm_methods[] = {
-	{"mktime",    jd_mktime},
-	{"mktime!",   jd_mktime_inplace},
-	{"normalize", jd_mktime_inplace},
-	{"strftime",  jd_strftime},
+	// raw mktime, returning time_t
+	{"mktime",     jd_mktime},
+	{"mktime!",    jd_mktime_inplace},
+	// shortcut for localtime(mktime)
+	{"localtime",  jd_time_localtime},
+	{"localtime!", jd_time_localtime_inplace},
+	// shortcut for gmtime(mktime)
+	{"utc",        jd_time_utc},
+	{"utc!",       jd_time_utc_inplace},
+	{"strftime",   jd_strftime},
 	{NULL, NULL},
 };
 
@@ -155,6 +161,13 @@ struct tm *jd_maketm(void) {
 	return janet_abstract(&jd_tm_t, sizeof(struct tm));
 }
 
+struct tm *jd_opttm(Janet *argv, int32_t argc, int32_t n) {
+    if (n >= argc || janet_checktype(argv[n], JANET_NIL)) {
+		return NULL;
+	}
+	return jd_gettm(argv, n);
+}
+
 JANET_FN(jd_mktime,
 		"",
 		"") {
@@ -177,6 +190,60 @@ JANET_FN(jd_mktime_inplace,
 	return janet_wrap_abstract(time);
 }
 
+JANET_FN(jd_time_utc,
+		"",
+		"") {
+	janet_arity(argc, 0, 1);
+	struct tm *tm = jd_opttm(argv, argc, 0);
+	struct tm *nw = jd_maketm();
+	time_t t;
+	if (tm) {
+		*nw = *tm;
+		t = mktime(nw);
+	} else {
+		t = time(NULL);
+	}
+	*nw = *(gmtime(&t));
+	return janet_wrap_abstract(nw);
+}
+
+JANET_FN(jd_time_utc_inplace,
+		"",
+		"") {
+	janet_fixarity(argc, 1);
+	struct tm *tm = jd_gettm(argv, 0);
+	time_t t = mktime(tm);
+	*tm = *(gmtime(&t));
+	return janet_wrap_abstract(tm);
+}
+
+JANET_FN(jd_time_localtime,
+		"",
+		"") {
+	janet_arity(argc, 0, 1);
+	struct tm *tm = jd_opttm(argv, argc, 0);
+	struct tm *nw = jd_maketm();
+	time_t t;
+	if (tm) {
+		*nw = *tm;
+		t = mktime(nw);
+	} else {
+		t = time(NULL);
+	}
+	*nw = *(localtime(&t));
+	return janet_wrap_abstract(nw);
+}
+
+JANET_FN(jd_time_localtime_inplace,
+		"",
+		"") {
+	janet_fixarity(argc, 1);
+	struct tm *tm = jd_gettm(argv, 0);
+	time_t t = mktime(tm);
+	*tm = *(localtime(&t));
+	return janet_wrap_abstract(tm);
+}
+
 // strftime
 struct strftime_format {
 	const char *keyword;
-- 
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