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#include "date.h"
// wrappers around time_t
static JanetMethod jd_time_methods[] = {
{"gmtime", jd_gmtime},
{"localtime", jd_localtime},
{NULL, NULL},
};
static int jd_time_compare(void *lhs, void *rhs) {
time_t lhv = (*(time_t*)lhs);
time_t rhv = (*(time_t*)rhs);
return difftime(lhv, rhv);
}
static int jd_time_get(void *p, Janet key, Janet *out) {
(void) p;
if (!janet_checktype(key, JANET_KEYWORD)) {
return 0;
}
return janet_getmethod(janet_unwrap_keyword(key), jd_time_methods, out);
}
// time_t is always a UTC-representation
static void jd_time_tostring(void *p, JanetBuffer *buffer) {
// print ISO 8601
strftime_buffer("%F %T%z", gmtime(p), buffer);
}
static const JanetAbstractType jd_time_t = {
"date/time",
NULL,
NULL,
jd_time_get,
NULL,
NULL,
NULL,
jd_time_tostring,
jd_time_compare,
JANET_ATEND_COMPARE
};
time_t *jd_gettime(Janet *argv, int32_t n) {
return (time_t*)janet_getabstract(argv, n, &jd_time_t);
}
time_t *jd_maketime(void) {
return janet_abstract(&jd_time_t, sizeof(time_t));
}
JANET_FN(jd_gmtime,
"(gmtime (time))",
"Convert a date/time object into a date/tm object as UTC.") {
janet_fixarity(argc, 1);
time_t *time = jd_gettime(argv, 0);
struct tm *tm = gmtime(time);
struct tm *out = jd_maketm();
*out = *tm;
return janet_wrap_abstract(out);
}
JANET_FN(jd_localtime,
"(localtime (time))",
"Convert a date/time object into a date/tm object as localtime.") {
janet_fixarity(argc, 1);
time_t *time = jd_gettime(argv, 0);
struct tm *tm = localtime(time);
struct tm *out = jd_maketm();
*out = *tm;
return janet_wrap_abstract(out);
}
JANET_FN(jd_time,
"(time)",
"Get the current moment in time as a date/time object.") {
(void) argv;
janet_fixarity(argc, 0);
time_t *out = jd_maketime();
time(out);
return janet_wrap_abstract(out);
}
void jd_time_register(JanetTable *env, const char *regprefix) {
const JanetRegExt cfuns[] = {
JANET_REG("gmtime", jd_gmtime),
JANET_REG("localtime", jd_localtime),
JANET_REG("time", jd_time),
JANET_REG_END
};
janet_cfuns_ext(env, regprefix, cfuns);
}
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