1 files changed, 223 insertions, 0 deletions
diff --git a/build/generate-emoji.go b/build/generate-emoji.go
new file mode 100644
index 00000000..5a88e456
--- /dev/null
+++ b/build/generate-emoji.go
@@ -0,0 +1,223 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Copyright 2015 Kenneth Shaw
+// SPDX-License-Identifier: MIT
+
+//go:build ignore
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"go/format"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+
+	"code.gitea.io/gitea/modules/json"
+)
+
+const (
+	gemojiURL         = "https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json"
+	maxUnicodeVersion = 15
+)
+
+var flagOut = flag.String("o", "modules/emoji/emoji_data.go", "out")
+
+// Gemoji is a set of emoji data.
+type Gemoji []Emoji
+
+// Emoji represents a single emoji and associated data.
+type Emoji struct {
+	Emoji          string   `json:"emoji"`
+	Description    string   `json:"description,omitempty"`
+	Aliases        []string `json:"aliases"`
+	UnicodeVersion string   `json:"unicode_version,omitempty"`
+	SkinTones      bool     `json:"skin_tones,omitempty"`
+}
+
+// Don't include some fields in JSON
+func (e Emoji) MarshalJSON() ([]byte, error) {
+	type emoji Emoji
+	x := emoji(e)
+	x.UnicodeVersion = ""
+	x.Description = ""
+	x.SkinTones = false
+	return json.Marshal(x)
+}
+
+func main() {
+	var err error
+
+	flag.Parse()
+
+	// generate data
+	buf, err := generate()
+	if err != nil {
+		log.Fatalf("generate err: %v", err)
+	}
+
+	// write
+	err = os.WriteFile(*flagOut, buf, 0o644)
+	if err != nil {
+		log.Fatalf("WriteFile err: %v", err)
+	}
+}
+
+var replacer = strings.NewReplacer(
+	"main.Gemoji", "Gemoji",
+	"main.Emoji", "\n",
+	"}}", "},\n}",
+	", Description:", ", ",
+	", Aliases:", ", ",
+	", UnicodeVersion:", ", ",
+	", SkinTones:", ", ",
+)
+
+var emojiRE = regexp.MustCompile(`\{Emoji:"([^"]*)"`)
+
+func generate() ([]byte, error) {
+	var err error
+
+	// load gemoji data
+	res, err := http.Get(gemojiURL)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+
+	// read all
+	body, err := io.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// unmarshal
+	var data Gemoji
+	err = json.Unmarshal(body, &data)
+	if err != nil {
+		return nil, err
+	}
+
+	skinTones := make(map[string]string)
+
+	skinTones["\U0001f3fb"] = "Light Skin Tone"
+	skinTones["\U0001f3fc"] = "Medium-Light Skin Tone"
+	skinTones["\U0001f3fd"] = "Medium Skin Tone"
+	skinTones["\U0001f3fe"] = "Medium-Dark Skin Tone"
+	skinTones["\U0001f3ff"] = "Dark Skin Tone"
+
+	var tmp Gemoji
+
+	// filter out emoji that require greater than max unicode version
+	for i := range data {
+		val, _ := strconv.ParseFloat(data[i].UnicodeVersion, 64)
+		if int(val) <= maxUnicodeVersion {
+			tmp = append(tmp, data[i])
+		}
+	}
+	data = tmp
+
+	sort.Slice(data, func(i, j int) bool {
+		return data[i].Aliases[0] < data[j].Aliases[0]
+	})
+
+	aliasMap := make(map[string]int, len(data))
+
+	for i, e := range data {
+		if e.Emoji == "" || len(e.Aliases) == 0 {
+			continue
+		}
+		for _, a := range e.Aliases {
+			if a == "" {
+				continue
+			}
+			aliasMap[a] = i
+		}
+	}
+
+	// Forgejo customizations
+	i, ok := aliasMap["tada"]
+	if ok {
+		data[i].Aliases = append(data[i].Aliases, "hooray")
+	}
+	i, ok = aliasMap["laughing"]
+	if ok {
+		data[i].Aliases = append(data[i].Aliases, "laugh")
+	}
+
+	// write a JSON file to use with tribute (write before adding skin tones since we can't support them there yet)
+	file, _ := json.Marshal(data)
+	_ = os.WriteFile("assets/emoji.json", file, 0o644)
+
+	// Add skin tones to emoji that support it
+	var (
+		s              []string
+		newEmoji       string
+		newDescription string
+		newData        Emoji
+	)
+
+	for i := range data {
+		if data[i].SkinTones {
+			for k, v := range skinTones {
+				s = strings.Split(data[i].Emoji, "")
+
+				if utf8.RuneCountInString(data[i].Emoji) == 1 {
+					s = append(s, k)
+				} else {
+					// insert into slice after first element because all emoji that support skin tones
+					// have that modifier placed at this spot
+					s = append(s, "")
+					copy(s[2:], s[1:])
+					s[1] = k
+				}
+
+				newEmoji = strings.Join(s, "")
+				newDescription = data[i].Description + ": " + v
+				newAlias := data[i].Aliases[0] + "_" + strings.ReplaceAll(v, " ", "_")
+
+				newData = Emoji{newEmoji, newDescription, []string{newAlias}, "12.0", false}
+				data = append(data, newData)
+			}
+		}
+	}
+
+	sort.Slice(data, func(i, j int) bool {
+		return data[i].Aliases[0] < data[j].Aliases[0]
+	})
+
+	// add header
+	str := replacer.Replace(fmt.Sprintf(hdr, gemojiURL, data))
+
+	// change the format of the unicode string
+	str = emojiRE.ReplaceAllStringFunc(str, func(s string) string {
+		var err error
+		s, err = strconv.Unquote(s[len("{Emoji:"):])
+		if err != nil {
+			panic(err)
+		}
+		return "{" + strconv.QuoteToASCII(s)
+	})
+
+	// format
+	return format.Source([]byte(str))
+}
+
+const hdr = `
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+
+package emoji
+
+// Code generated by build/generate-emoji.go. DO NOT EDIT.
+// Sourced from %s
+var GemojiData = %#v
+`