❤️ 完整开源界面和内核 https://github.com/siyuan-note/siyuan/issues/5013

kernel/util/font.go

@@ -0,0 +1,154 @@
+// SiYuan - Build Your Eternal Digital Garden
+// Copyright (c) 2020-present, b3log.org
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package util
+
+import (
+	"os"
+	"sort"
+	"strings"
+
+	"github.com/ConradIrwin/font/sfnt"
+	"github.com/flopp/go-findfont"
+	ttc "golang.org/x/image/font/sfnt"
+	textUnicode "golang.org/x/text/encoding/unicode"
+	"golang.org/x/text/transform"
+)
+
+func GetSysFonts(currentLanguage string) (ret []string) {
+	fonts := loadFonts(currentLanguage)
+	ret = RemoveDuplicatedElem(fonts)
+	ret = removeUnusedFonts(ret)
+	sort.Strings(ret)
+	return
+}
+
+func removeUnusedFonts(fonts []string) (ret []string) {
+	ret = []string{}
+	for _, font := range fonts {
+		if strings.HasPrefix(font, "Noto Sans") {
+			continue
+		}
+		ret = append(ret, font)
+	}
+	return
+}
+
+func loadFonts(currentLanguage string) (ret []string) {
+	ret = []string{}
+	for _, f := range findfont.List() {
+		if strings.HasSuffix(strings.ToLower(f), ".ttc") {
+			data, err := os.ReadFile(f)
+			if nil != err {
+				LogErrorf("read font file [%s] failed: %s", f, err)
+				continue
+			}
+			collection, err := ttc.ParseCollection(data)
+			if nil != err {
+				//LogErrorf("parse font collection [%s] failed: %s", f, err)
+				continue
+			}
+
+			for i := 0; i < collection.NumFonts(); i++ {
+				font, err := collection.Font(i)
+				if nil != err {
+					//LogErrorf("get font [%s] failed: %s", f, err)
+					continue
+				}
+				if family := parseFontFamily(font); "" != family {
+					ret = append(ret, family)
+					//LogInfof("[%s] [%s]", f, family)
+				}
+			}
+		} else if strings.HasSuffix(strings.ToLower(f), ".otf") || strings.HasSuffix(strings.ToLower(f), ".ttf") {
+			fontFile, err := os.Open(f)
+			if nil != err {
+				//LogErrorf("open font file [%s] failed: %s", f, err)
+				continue
+			}
+			font, err := sfnt.Parse(fontFile)
+			if nil != err {
+				//LogErrorf("parse font [%s] failed: %s", f, err)
+				continue
+			}
+
+			t, err := font.NameTable()
+			if nil != err {
+				//LogErrorf("parse font name table [%s] failed: %s", f, err)
+				return
+			}
+			fontFile.Close()
+			var family, familyChinese string
+			for _, e := range t.List() {
+				if sfnt.NameFontFamily != e.NameID && sfnt.NamePreferredFamily != e.NameID {
+					continue
+				}
+
+				if sfnt.PlatformLanguageID(1033) == e.LanguageID {
+					v, _, err := transform.Bytes(textUnicode.UTF16(textUnicode.BigEndian, textUnicode.IgnoreBOM).NewDecoder(), e.Value)
+					if nil != err {
+						//LogErrorf("decode font family [%s] failed: %s", f, err)
+						continue
+					}
+					val := string(v)
+					if sfnt.NameFontFamily == e.NameID && "" != val {
+						family = val
+					}
+					if sfnt.NamePreferredFamily == e.NameID && "" != val {
+						family = val
+					}
+				} else if sfnt.PlatformLanguageID(2052) == e.LanguageID {
+					if "zh_CN" != currentLanguage {
+						continue
+					}
+
+					v, _, err := transform.Bytes(textUnicode.UTF16(textUnicode.BigEndian, textUnicode.IgnoreBOM).NewDecoder(), e.Value)
+					if nil != err {
+						//LogErrorf("decode font family [%s] failed: %s", f, err)
+						continue
+					}
+					val := string(v)
+					if sfnt.NameFontFamily == e.NameID && "" != val {
+						familyChinese = val
+					}
+					if sfnt.NamePreferredFamily == e.NameID && "" != val {
+						familyChinese = val
+					}
+				}
+			}
+			if "" != family && !strings.HasPrefix(family, ".") {
+				ret = append(ret, family)
+				//LogInfof("[%s] [%s]", f, family)
+			}
+			if "" != familyChinese && !strings.HasPrefix(familyChinese, ".") {
+				ret = append(ret, familyChinese)
+				//LogInfof("[%s] [%s]", f, family)
+			}
+		}
+	}
+	return
+}
+
+func parseFontFamily(font *ttc.Font) string {
+	family, _ := font.Name(nil, ttc.NameIDTypographicFamily)
+	if "" == family {
+		family, _ = font.Name(nil, ttc.NameIDFamily)
+	}
+	if strings.HasPrefix(family, ".") {
+		return ""
+	}
+	return family
+}