[I18N] Add Locale merger script

(cherry picked from commit ecc3dae2ac)
(cherry picked from commit c6c3fc6ace)
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[I18N] in the home page replace GitHub with Forgejo

The english string that shows on the home page to encourage for
contribution no longer reference GitHub. But some translations still
do. In this context, and this context only, replace it with Forgejo
even though it may not be correct in some cases.

Refs: https://codeberg.org/forgejo/forgejo/pulls/450
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Replaced gitea links with forgejo - protected tags, webhooks

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[I18N] Add Locale merger script (squash) abort on NOOP

If a string is no longer used in the english version of the locales,
it means the Gitea string was changed and it needs updating. Abort
when it is the case and recommend action.

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build/merge-forgejo-locales.go

@@ -0,0 +1,117 @@
+// Copyright 2022 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+
+package main
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+
+	"gopkg.in/ini.v1"
+)
+
+const (
+	trimPrefix   = "gitea_"
+	sourceFolder = "options/locales/"
+)
+
+// returns list of locales, still containing the file extension!
+func generate_locale_list() []string {
+	localeFiles, _ := os.ReadDir(sourceFolder)
+	locales := []string{}
+	for _, localeFile := range localeFiles {
+		if !localeFile.IsDir() && strings.HasPrefix(localeFile.Name(), trimPrefix) {
+			locales = append(locales, strings.TrimPrefix(localeFile.Name(), trimPrefix))
+		}
+	}
+	return locales
+}
+
+// replace all occurrences of Gitea with Forgejo
+func renameGiteaForgejo(filename string) []byte {
+	file, err := os.Open(filename)
+	if err != nil {
+		panic(err)
+	}
+
+	replacements := []string{
+		"Gitea", "Forgejo",
+		"https://docs.gitea.com/installation/install-from-binary", "https://forgejo.org/download/#installation-from-binary",
+		"https://github.com/go-gitea/gitea/tree/master/docker", "https://forgejo.org/download/#container-image",
+		"https://docs.gitea.com/installation/install-from-package", "https://forgejo.org/download",
+		"https://code.gitea.io/gitea", "https://forgejo.org/download",
+		"code.gitea.io/gitea", "Forgejo",
+		`<a href="https://github.com/go-gitea/gitea/issues" target="_blank">GitHub</a>`, `<a href="https://codeberg.org/forgejo/forgejo/issues" target="_blank">Codeberg</a>`,
+		"https://github.com/go-gitea/gitea", "https://codeberg.org/forgejo/forgejo",
+		"https://blog.gitea.io", "https://forgejo.org/news",
+		"https://docs.gitea.com/usage/protected-tags", "https://forgejo.org/docs/latest/user/protection/#protected-tags",
+		"https://docs.gitea.com/usage/webhooks", "https://forgejo.org/docs/latest/user/webhooks/",
+	}
+	replacer := strings.NewReplacer(replacements...)
+	replaced := make(map[string]bool, len(replacements)/2)
+	count_replaced := func(original string) {
+		for i := 0; i < len(replacements); i += 2 {
+			if strings.Contains(original, replacements[i]) {
+				replaced[replacements[i]] = true
+			}
+		}
+	}
+
+	out := make([]byte, 0, 1024)
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		if strings.HasPrefix(line, "license_desc=") {
+			line = strings.Replace(line, "GitHub", "Forgejo", 1)
+		}
+
+		if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
+			out = append(out, []byte("\n"+line+"\n")...)
+		} else if strings.HasPrefix(line, "settings.web_hook_name_gitea") {
+			out = append(out, []byte("\n"+line+"\n")...)
+			out = append(out, []byte("settings.web_hook_name_forgejo = Forgejo\n")...)
+		} else if strings.HasPrefix(line, "migrate.gitea.description") {
+			re := regexp.MustCompile(`(.*Gitea)`)
+			out = append(out, []byte(re.ReplaceAllString(line, "${1}/Forgejo")+"\n")...)
+		} else {
+			count_replaced(line)
+			out = append(out, []byte(replacer.Replace(line)+"\n")...)
+		}
+	}
+	file.Close()
+	if strings.HasSuffix(filename, "gitea_en-US.ini") {
+		for i := 0; i < len(replacements); i += 2 {
+			if replaced[replacements[i]] == false {
+				log.Fatalf("%s was never used to replace something in %s, it is obsolete and must be updated", replacements[i], filename)
+			}
+		}
+	}
+	return out
+}
+
+func main() {
+	locales := generate_locale_list()
+	var err error
+	var localeFile *ini.File
+	for _, locale := range locales {
+		giteaLocale := sourceFolder + "gitea_" + locale
+		localeFile, err = ini.LoadSources(ini.LoadOptions{
+			IgnoreInlineComment: true,
+		}, giteaLocale, renameGiteaForgejo(giteaLocale))
+		if err != nil {
+			panic(err)
+		}
+		err = localeFile.SaveTo("options/locale/locale_" + locale)
+		if err != nil {
+			panic(err)
+		}
+	}
+}