feat: Added Go style date format configuration.

bench/date/inplace/format.odin

@@ -0,0 +1,133 @@
+package inplace
+
+import "../common"
+import "core:bytes"
+import "core:fmt"
+import "core:mem"
+import "core:strings"
+import "core:time"
+import "core:time/datetime"
+
+format_date :: proc(
+	dt: common.Date_Components,
+	fmt: string,
+	allocator := context.temp_allocator,
+) -> string {
+	b := make([]byte, len(fmt), context.temp_allocator)
+	x := transmute([]byte)(fmt)
+	mem.copy_non_overlapping(&b[0], &x, len(fmt))
+
+
+	return string(b)
+	// for i := 0; i < len(fmt); {
+	// 	matched := match_token(&b, dt, fmt[i:])
+	// 	if matched > 0 {
+	// 		i += matched
+	// 	} else {
+	// 		strings.write_byte(&b, fmt[i])
+	// 		i += 1
+	// 	}
+	// }
+
+	// log.debugf("formatted date: '%s'", b.buf)
+	// return strings.to_string(b)
+}
+
+FULL_MONTH: string : "January"
+
+match_token :: proc(s: []byte, dt: common.Date_Components) {
+	if bytes.equal(s[:len(FULL_MONTH)], transmute([]u8)FULL_MONTH) {
+		mo := fmt.tprintf("%s", time.Month(dt.month))
+		mem.copy_non_overlapping(&s[0], &(transmute([]u8)mo)[0], len(mo))
+	}
+	/*
+	if strings.has_prefix(s, "Monday") {emit_weekday(b, dt, full = true); return 6}
+	if strings.has_prefix(
+		s,
+		"2006",
+	) {strings.write_string(b, fmt.tprintf("%04d", dt.year)); return 4}
+	if strings.has_prefix(s, "MST") {strings.write_string(b, "UTC"); return 3}
+	if strings.has_prefix(s, "Jan") {emit_month_abbr(b, dt); return 3}
+	if strings.has_prefix(s, "Mon") {emit_weekday(b, dt, full = false); return 3}
+	if strings.has_prefix(
+		s,
+		"06",
+	) {strings.write_string(b, fmt.tprintf("%02d", dt.year % 100)); return 2}
+	if strings.has_prefix(s, "02") {strings.write_string(b, fmt.tprintf("%02d", dt.day)); return 2}
+	if strings.has_prefix(
+		s,
+		"15",
+	) {strings.write_string(b, fmt.tprintf("%02d", dt.hour)); return 2}
+	if strings.has_prefix(
+		s,
+		"04",
+	) {strings.write_string(b, fmt.tprintf("%02d", dt.minute)); return 2}
+	if strings.has_prefix(
+		s,
+		"05",
+	) {strings.write_string(b, fmt.tprintf("%02d", dt.second)); return 2}
+	if strings.has_prefix(
+		s,
+		"01",
+	) {strings.write_string(b, fmt.tprintf("%02d", dt.month)); return 2}
+	if strings.has_prefix(s, "03") {emit_hour_12(b, dt, pad = true); return 2}
+	if strings.has_prefix(s, "PM") {
+		strings.write_string(b, "PM" if dt.hour >= 12 else "AM")
+		return 2
+	}
+	if strings.has_prefix(s, "pm") {
+		strings.write_string(b, "pm" if dt.hour >= 12 else "am")
+		return 2
+	}
+	if len(s) >= 1 {
+		switch s[0] {
+		case '2':
+			strings.write_string(b, fmt.tprintf("%d", dt.day)); return 1
+		case '1':
+			strings.write_string(b, fmt.tprintf("%d", dt.month)); return 1
+		case '4':
+			strings.write_string(b, fmt.tprintf("%d", dt.minute)); return 1
+		case '5':
+			strings.write_string(b, fmt.tprintf("%d", dt.second)); return 1
+		case '3':
+			emit_hour_12(b, dt, pad = false); return 1
+		case:
+			return 0
+		}
+	}
+	*/
+}
+
+emit_month_abbr :: proc(b: ^strings.Builder, dt: common.Date_Components) {
+	name := fmt.tprintf("%s", time.Month(dt.month))
+	strings.write_string(b, name[:3 if len(name) >= 3 else len(name)])
+}
+
+emit_weekday :: proc(b: ^strings.Builder, dt: common.Date_Components, full: bool) {
+	date := datetime.Date {
+		year  = i64(dt.year),
+		month = i8(dt.month),
+		day   = i8(dt.day),
+	}
+	ordinal, err := datetime.date_to_ordinal(date)
+	if err != .None {
+		strings.write_string(b, "???")
+		return
+	}
+	weekday := datetime.day_of_week(ordinal)
+	name := fmt.tprintf("%s", weekday)
+	if full {
+		strings.write_string(b, name)
+	} else {
+		strings.write_string(b, name[:3 if len(name) >= 3 else len(name)])
+	}
+}
+
+emit_hour_12 :: proc(b: ^strings.Builder, dt: common.Date_Components, pad: bool) {
+	h12 := dt.hour % 12
+	if h12 == 0 {h12 = 12}
+	format := "%02d" if pad else "%d"
+
+	fmt.sbprintf(b, format, h12)
+}
+