Introduce GiteaLocaleNumber custom element to handle number localization on pages. (#23861)

Follow #21429 & #22861

Use `<gitea-locale-number>` instead of backend `PrettyNumber`. All old
`PrettyNumber` related functions are removed. A lot of code could be
simplified.

And some functions haven't been used for long time (dead code), so they
are also removed by the way (eg: `SplitStringAtRuneN`, `Dedent`)

This PR only tries to improve the `PrettyNumber` rendering problem, it
doesn't touch the "plural" problem.

Screenshot:


![image](https://user-images.githubusercontent.com/2114189/229290804-1f63db65-1e34-4a54-84ba-e00b44331b17.png)


![image](https://user-images.githubusercontent.com/2114189/229290911-c88dea00-b11d-48dd-accb-9f52edd73ce4.png)

7 files changed, 43 insertions, 167 deletions

diff --git a/modules/base/tool.go b/modules/base/tool.go
index 94f19576b4..bd3a8458ee 100644
--- a/modules/base/tool.go
+++ b/modules/base/tool.go
@@ -22,7 +22,6 @@ import (
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/util"
 
 	"github.com/dustin/go-humanize"
 	"github.com/minio/sha256-simd"
@@ -142,12 +141,6 @@ func FileSize(s int64) string {
 	return humanize.IBytes(uint64(s))
 }
 
-// PrettyNumber produces a string form of the given number in base 10 with
-// commas after every three orders of magnitude
-func PrettyNumber(i interface{}) string {
-	return humanize.Comma(util.NumberIntoInt64(i))
-}
-
 // Subtract deals with subtraction of all types of number.
 func Subtract(left, right interface{}) interface{} {
 	var rleft, rright int64
diff --git a/modules/base/tool_test.go b/modules/base/tool_test.go
index 81f4b464e6..33677a910c 100644
--- a/modules/base/tool_test.go
+++ b/modules/base/tool_test.go
@@ -114,13 +114,6 @@ func TestFileSize(t *testing.T) {
 	assert.Equal(t, "2.0 EiB", FileSize(size))
 }
 
-func TestPrettyNumber(t *testing.T) {
-	assert.Equal(t, "23,342,432", PrettyNumber(23342432))
-	assert.Equal(t, "23,342,432", PrettyNumber(int32(23342432)))
-	assert.Equal(t, "0", PrettyNumber(0))
-	assert.Equal(t, "-100,000", PrettyNumber(-100000))
-}
-
 func TestSubtract(t *testing.T) {
 	toFloat64 := func(n interface{}) float64 {
 		switch v := n.(type) {
diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index a8343428dc..54c85863bd 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -19,7 +19,6 @@ import (
 	"reflect"
 	"regexp"
 	"runtime"
-	"strconv"
 	"strings"
 	texttmpl "text/template"
 	"time"
@@ -112,18 +111,17 @@ func NewFuncMap() []template.FuncMap {
 		"IsShowFullName": func() bool {
 			return setting.UI.DefaultShowFullName
 		},
-		"Safe":           Safe,
-		"SafeJS":         SafeJS,
-		"JSEscape":       JSEscape,
-		"Str2html":       Str2html,
-		"TimeSince":      timeutil.TimeSince,
-		"TimeSinceUnix":  timeutil.TimeSinceUnix,
-		"FileSize":       base.FileSize,
-		"PrettyNumber":   base.PrettyNumber,
-		"JsPrettyNumber": JsPrettyNumber,
-		"Subtract":       base.Subtract,
-		"EntryIcon":      base.EntryIcon,
-		"MigrationIcon":  MigrationIcon,
+		"Safe":          Safe,
+		"SafeJS":        SafeJS,
+		"JSEscape":      JSEscape,
+		"Str2html":      Str2html,
+		"TimeSince":     timeutil.TimeSince,
+		"TimeSinceUnix": timeutil.TimeSinceUnix,
+		"FileSize":      base.FileSize,
+		"LocaleNumber":  LocaleNumber,
+		"Subtract":      base.Subtract,
+		"EntryIcon":     base.EntryIcon,
+		"MigrationIcon": MigrationIcon,
 		"Add": func(a ...int) int {
 			sum := 0
 			for _, val := range a {
@@ -410,62 +408,9 @@ func NewFuncMap() []template.FuncMap {
 		"Join":        strings.Join,
 		"QueryEscape": url.QueryEscape,
 		"DotEscape":   DotEscape,
-		"Iterate": func(arg interface{}) (items []uint64) {
-			count := uint64(0)
-			switch val := arg.(type) {
-			case uint64:
-				count = val
-			case *uint64:
-				count = *val
-			case int64:
-				if val < 0 {
-					val = 0
-				}
-				count = uint64(val)
-			case *int64:
-				if *val < 0 {
-					*val = 0
-				}
-				count = uint64(*val)
-			case int:
-				if val < 0 {
-					val = 0
-				}
-				count = uint64(val)
-			case *int:
-				if *val < 0 {
-					*val = 0
-				}
-				count = uint64(*val)
-			case uint:
-				count = uint64(val)
-			case *uint:
-				count = uint64(*val)
-			case int32:
-				if val < 0 {
-					val = 0
-				}
-				count = uint64(val)
-			case *int32:
-				if *val < 0 {
-					*val = 0
-				}
-				count = uint64(*val)
-			case uint32:
-				count = uint64(val)
-			case *uint32:
-				count = uint64(*val)
-			case string:
-				cnt, _ := strconv.ParseInt(val, 10, 64)
-				if cnt < 0 {
-					cnt = 0
-				}
-				count = uint64(cnt)
-			}
-			if count <= 0 {
-				return items
-			}
-			for i := uint64(0); i < count; i++ {
+		"Iterate": func(arg interface{}) (items []int64) {
+			count := util.ToInt64(arg)
+			for i := int64(0); i < count; i++ {
 				items = append(items, i)
 			}
 			return items
@@ -1067,10 +1012,8 @@ func mirrorRemoteAddress(ctx context.Context, m *repo_model.Repository, remoteNa
 	return a
 }
 
-// JsPrettyNumber renders a number using english decimal separators, e.g. 1,200 and subsequent
-// JS will replace the number with locale-specific separators, based on the user's selected language
-func JsPrettyNumber(i interface{}) template.HTML {
-	num := util.NumberIntoInt64(i)
-
-	return template.HTML(`<span class="js-pretty-number" data-value="` + strconv.FormatInt(num, 10) + `">` + base.PrettyNumber(num) + `</span>`)
+// LocaleNumber renders a number with a Custom Element, browser will render it with a locale number
+func LocaleNumber(v interface{}) template.HTML {
+	num := util.ToInt64(v)
+	return template.HTML(fmt.Sprintf(`<gitea-locale-number data-number="%d">%d</gitea-locale-number>`, num, num))
 }
diff --git a/modules/util/truncate.go b/modules/util/truncate.go
index 032a6c0872..f41d27d8b7 100644
--- a/modules/util/truncate.go
+++ b/modules/util/truncate.go
@@ -35,27 +35,3 @@ func SplitStringAtByteN(input string, n int) (left, right string) {
 
 	return input[:end] + utf8Ellipsis, utf8Ellipsis + input[end:]
 }
-
-// SplitStringAtRuneN splits a string at rune n accounting for rune boundaries. (Combining characters are not accounted for.)
-func SplitStringAtRuneN(input string, n int) (left, right string) {
-	if !utf8.ValidString(input) {
-		if len(input) <= n || n-3 < 0 {
-			return input, ""
-		}
-		return input[:n-3] + asciiEllipsis, asciiEllipsis + input[n-3:]
-	}
-
-	if utf8.RuneCountInString(input) <= n {
-		return input, ""
-	}
-
-	count := 0
-	end := 0
-	for count < n-1 {
-		_, size := utf8.DecodeRuneInString(input[end:])
-		end += size
-		count++
-	}
-
-	return input[:end] + utf8Ellipsis, utf8Ellipsis + input[end:]
-}
diff --git a/modules/util/truncate_test.go b/modules/util/truncate_test.go
index 912bfb3d5f..05e2bc0301 100644
--- a/modules/util/truncate_test.go
+++ b/modules/util/truncate_test.go
@@ -43,18 +43,4 @@ func TestSplitString(t *testing.T) {
 		{"\xef\x03", 1, "\xef\x03", ""},
 	}
 	test(tc, SplitStringAtByteN)
-
-	tc = []*testCase{
-		{"abc123xyz", 0, "", utf8Ellipsis},
-		{"abc123xyz", 1, "", utf8Ellipsis},
-		{"abc123xyz", 4, "abc", utf8Ellipsis},
-		{"啊bc123xyz", 4, "啊bc", utf8Ellipsis},
-		{"啊bc123xyz", 6, "啊bc12", utf8Ellipsis},
-		{"啊bc", 3, "啊bc", ""},
-		{"啊bc", 4, "啊bc", ""},
-		{"abc\xef\x03\xfe", 3, "", asciiEllipsis},
-		{"abc\xef\x03\xfe", 4, "a", asciiEllipsis},
-		{"\xef\x03", 1, "\xef\x03", ""},
-	}
-	test(tc, SplitStringAtRuneN)
 }
diff --git a/modules/util/util.go b/modules/util/util.go
index 9d3a8dcfac..9c7097ad34 100644
--- a/modules/util/util.go
+++ b/modules/util/util.go
@@ -7,8 +7,9 @@ import (
 	"bytes"
 	"crypto/rand"
 	"errors"
+	"fmt"
 	"math/big"
-	"regexp"
+	"os"
 	"strconv"
 	"strings"
 
@@ -200,40 +201,14 @@ func ToTitleCaseNoLower(s string) string {
 	return titleCaserNoLower.String(s)
 }
 
-var (
-	whitespaceOnly    = regexp.MustCompile("(?m)^[ \t]+$")
-	leadingWhitespace = regexp.MustCompile("(?m)(^[ \t]*)(?:[^ \t\n])")
-)
-
-// Dedent removes common indentation of a multi-line string along with whitespace around it
-// Based on https://github.com/lithammer/dedent
-func Dedent(s string) string {
-	var margin string
-
-	s = whitespaceOnly.ReplaceAllString(s, "")
-	indents := leadingWhitespace.FindAllStringSubmatch(s, -1)
-
-	for i, indent := range indents {
-		if i == 0 {
-			margin = indent[1]
-		} else if strings.HasPrefix(indent[1], margin) {
-			continue
-		} else if strings.HasPrefix(margin, indent[1]) {
-			margin = indent[1]
-		} else {
-			margin = ""
-			break
-		}
-	}
-
-	if margin != "" {
-		s = regexp.MustCompile("(?m)^"+margin).ReplaceAllString(s, "")
-	}
-	return strings.TrimSpace(s)
+func logError(msg string, args ...any) {
+	// TODO: the "util" package can not import the "modules/log" package, so we use the "fmt" package here temporarily.
+	// In the future, we should decouple the dependency between them.
+	_, _ = fmt.Fprintf(os.Stderr, msg, args...)
 }
 
-// NumberIntoInt64 transform a given int into int64.
-func NumberIntoInt64(number interface{}) int64 {
+// ToInt64 transform a given int into int64.
+func ToInt64(number interface{}) int64 {
 	var value int64
 	switch v := number.(type) {
 	case int:
@@ -246,6 +221,23 @@ func NumberIntoInt64(number interface{}) int64 {
 		value = int64(v)
 	case int64:
 		value = v
+	case uint:
+		value = int64(v)
+	case uint8:
+		value = int64(v)
+	case uint16:
+		value = int64(v)
+	case uint32:
+		value = int64(v)
+	case uint64:
+		value = int64(v)
+	case string:
+		var err error
+		if value, err = strconv.ParseInt(v, 10, 64); err != nil {
+			logError("strconv.ParseInt failed for %q: %v", v, err)
+		}
+	default:
+		logError("unable to convert %q to int64", v)
 	}
 	return value
 }
diff --git a/modules/util/util_test.go b/modules/util/util_test.go
index 34fe070d22..8cceafa2f6 100644
--- a/modules/util/util_test.go
+++ b/modules/util/util_test.go
@@ -224,10 +224,3 @@ func TestToTitleCase(t *testing.T) {
 	assert.Equal(t, ToTitleCase(`foo bar baz`), `Foo Bar Baz`)
 	assert.Equal(t, ToTitleCase(`FOO BAR BAZ`), `Foo Bar Baz`)
 }
-
-func TestDedent(t *testing.T) {
-	assert.Equal(t, Dedent(`
-		foo
-			bar
-	`), "foo\n\tbar")
-}