From 37f4191962209bc35f2b7ffc4639be45fecb34d0 Mon Sep 17 00:00:00 2001
From: Liang Ding <d@b3log.org>
Date: Wed, 15 Mar 2023 18:27:35 +0800
Subject: [PATCH] =?UTF-8?q?:art:=20=E6=94=B9=E8=BF=9B=E9=97=AA=E5=8D=A1?=
 =?UTF-8?q?=E4=B8=8B=E4=B8=80=E8=BD=AE=E9=87=8D=E5=A4=8D=E6=97=B6=E9=97=B4?=
 =?UTF-8?q?=E6=98=BE=E7=A4=BA=E7=B2=BE=E5=BA=A6=20https://github.com/siyua?=
 =?UTF-8?q?n-note/siyuan/issues/7672?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 kernel/model/flashcard.go |  2 +-
 kernel/util/time.go       | 92 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 1 deletion(-)

diff --git a/kernel/model/flashcard.go b/kernel/model/flashcard.go
index 0a557c165..be50ee4f5 100644
--- a/kernel/model/flashcard.go
+++ b/kernel/model/flashcard.go
@@ -233,7 +233,7 @@ type Flashcard struct {
 func newFlashcard(card riff.Card, blockID, deckID string, now time.Time) *Flashcard {
 	nextDues := map[riff.Rating]string{}
 	for rating, due := range card.NextDues() {
-		nextDues[rating] = strings.TrimSpace(util.HumanizeRelTime(due, now, Conf.Lang))
+		nextDues[rating] = strings.TrimSpace(util.HumanizeDiffTime(due, now, Conf.Lang))
 	}
 
 	return &Flashcard{
diff --git a/kernel/util/time.go b/kernel/util/time.go
index 457eba976..ef82042ce 100644
--- a/kernel/util/time.go
+++ b/kernel/util/time.go
@@ -17,6 +17,8 @@
 package util
 
 import (
+	"bytes"
+	"fmt"
 	"math"
 	"strings"
 	"time"
@@ -38,6 +40,96 @@ func CurrentTimeSecondsStr() string {
 	return time.Now().Format("20060102150405")
 }
 
+func HumanizeDiffTime(a, b time.Time, lang string) string {
+	labels := TimeLangs[lang]
+	year, month, day, hour, min, _ := humanizeDiffTime(a, b)
+	buf := bytes.Buffer{}
+	if 0 < year {
+		if 1 == year {
+			buf.WriteString(fmt.Sprintf(labels["1y"].(string), " "))
+		} else {
+			buf.WriteString(fmt.Sprintf(labels["xy"].(string), year, " "))
+		}
+	}
+	if 0 < month {
+		if 1 == month {
+			buf.WriteString(fmt.Sprintf(labels["1M"].(string), " "))
+		} else {
+			buf.WriteString(fmt.Sprintf(labels["xM"].(string), month, " "))
+		}
+	}
+	if 0 < day {
+		if 1 == day {
+			buf.WriteString(fmt.Sprintf(labels["1d"].(string), " "))
+		} else {
+			buf.WriteString(fmt.Sprintf(labels["xd"].(string), day, " "))
+		}
+	}
+	if 0 < hour {
+		if 1 == hour {
+			buf.WriteString(fmt.Sprintf(labels["1h"].(string), " "))
+		} else {
+			buf.WriteString(fmt.Sprintf(labels["xh"].(string), hour, " "))
+		}
+	}
+	if 0 < min {
+		if 1 == min {
+			buf.WriteString(fmt.Sprintf(labels["1m"].(string), " "))
+		} else {
+			buf.WriteString(fmt.Sprintf(labels["xm"].(string), min, " "))
+		}
+	}
+	return strings.TrimSpace(buf.String())
+}
+
+func humanizeDiffTime(a, b time.Time) (year, month, day, hour, min, sec int) {
+	// 感谢 https://stackoverflow.com/a/36531443/1043233
+
+	if a.Location() != b.Location() {
+		b = b.In(a.Location())
+	}
+	if a.After(b) {
+		a, b = b, a
+	}
+	y1, M1, d1 := a.Date()
+	y2, M2, d2 := b.Date()
+
+	h1, m1, s1 := a.Clock()
+	h2, m2, s2 := b.Clock()
+
+	year = y2 - y1
+	month = int(M2 - M1)
+	day = d2 - d1
+	hour = h2 - h1
+	min = m2 - m1
+	sec = s2 - s1
+
+	// Normalize negative values
+	if sec < 0 {
+		sec += 60
+		min--
+	}
+	if min < 0 {
+		min += 60
+		hour--
+	}
+	if hour < 0 {
+		hour += 24
+		day--
+	}
+	if day < 0 {
+		// days in month:
+		t := time.Date(y1, M1, 32, 0, 0, 0, 0, time.UTC)
+		day += 32 - t.Day()
+		month--
+	}
+	if month < 0 {
+		month += 12
+		year--
+	}
+	return
+}
+
 func HumanizeRelTime(a time.Time, b time.Time, lang string) string {
 	_, magnitudes := humanizeTimeMagnitudes(lang)
 	return strings.TrimSpace(humanize.CustomRelTime(a, b, "", "", magnitudes))