imagepack: use emoji shortcode as fallback when importing packs

pkg/connector/emojis/shortcode_gen.go

@@ -0,0 +1,46 @@
+//go:build ignore
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+
+	"go.mau.fi/util/exerrors"
+	"go.mau.fi/util/variationselector"
+)
+
+type Emoji struct {
+	Unified   string `json:"unified"`
+	ShortName string `json:"short_name"`
+}
+
+func unifiedToUnicode(input string) string {
+	parts := strings.Split(input, "-")
+	output := make([]rune, len(parts))
+	for i, part := range parts {
+		output[i] = rune(exerrors.Must(strconv.ParseInt(part, 16, 32)))
+	}
+	return string(output)
+}
+
+func main() {
+	resp := exerrors.Must(http.Get("https://raw.githubusercontent.com/iamcal/emoji-data/master/emoji.json"))
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		panic(fmt.Errorf("unexpected status code %d", resp.StatusCode))
+	}
+	var emojis []*Emoji
+	exerrors.PanicIfNotNil(json.NewDecoder(resp.Body).Decode(&emojis))
+	output := make(map[string]string)
+	for _, emoji := range emojis {
+		output[variationselector.Add(unifiedToUnicode(emoji.Unified))] = emoji.ShortName
+	}
+	f := exerrors.Must(os.OpenFile("shortcodes.json", os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644))
+	exerrors.PanicIfNotNil(json.NewEncoder(f).Encode(output))
+	_ = f.Close()
+}