From 3355f861428d60d25d2fc93f14b0fffd5cb262c6 Mon Sep 17 00:00:00 2001
From: paradust7 <102263465+paradust7@users.noreply.github.com>
Date: Fri, 5 Jan 2024 06:09:01 +0000
Subject: [PATCH] Add gettext / multi-language support

---
 Dockerfile         |   3 +-
 build_minetest.sh  |   2 +-
 fetch_sources.sh   |   2 +-
 static/index.html  |  34 ++++++++---
 static/launcher.js | 140 +++++++++++++++++++++++++++++++++++++++++++--
 5 files changed, 166 insertions(+), 15 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 84aae0f..8a200d7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,8 @@ RUN \
 		cmake \
 		tclsh \
 		zip \
-		zstd
+		zstd \
+		gettext
 
 COPY . /minetest-wasm
 
diff --git a/build_minetest.sh b/build_minetest.sh
index cf8c71b..23713a8 100755
--- a/build_minetest.sh
+++ b/build_minetest.sh
@@ -30,7 +30,7 @@ if ! $INCREMENTAL; then
     emcmake cmake \
       -DCMAKE_VERBOSE_MAKEFILE=ON \
       -DENABLE_SYSTEM_GMP=OFF \
-      -DENABLE_GETTEXT=FALSE \
+      -DENABLE_GETTEXT=TRUE \
       -DRUN_IN_PLACE=TRUE \
       -DENABLE_GLES=TRUE \
       -DCMAKE_BUILD_TYPE="$MINETEST_BUILD_TYPE" \
diff --git a/fetch_sources.sh b/fetch_sources.sh
index 7f1f8ac..4307b9c 100755
--- a/fetch_sources.sh
+++ b/fetch_sources.sh
@@ -31,7 +31,7 @@ getrepo minetest_game "https://github.com/minetest/minetest_game.git" a3b171e317
 
 # These repos are part of the fork
 getrepo webshims "https://github.com/paradust7/webshims.git" 91c3fe85d2cb7f85cc8e19d3f53dc8f252a69ff7
-getrepo minetest "https://github.com/paradust7/minetest.git" bfe2f41d7e830df08814f6ec6c0ec686e3b0d20b
+getrepo minetest "https://github.com/paradust7/minetest.git" 943e0e9f99245aaf61a3e3967d53f807c70492e6
 getrepo irrlichtmt "https://github.com/paradust7/irrlicht.git" bcada2f995d7b927f6c67c755fb32a2a4da5b236
 
 # Make irrlichtmt symlink
diff --git a/static/index.html b/static/index.html
index 7b60199..c6de495 100644
--- a/static/index.html
+++ b/static/index.html
@@ -14,6 +14,13 @@
           <!-- filled by javascript -->
       </select>
 
+      <br/>
+
+      <b>Select language:</b>
+      <select id="select_language">
+          <!-- filled by javascript -->
+      </select>
+
       <hr>
       <button id="launch" style="width: 300px; height: 50px; font-size: 20pt;">Launch Minetest</button>
       <br/>
@@ -45,12 +52,13 @@
     </div>
     <script type="text/javascript" src="%__RELEASE_UUID__%/launcher.js"></script>
     <script type="text/javascript">
+
       // Reduce memory and network usage
-      const memorySavingConfig = `
-viewing_range = 85
-max_block_send_distance = 5
-max_block_generate_distance = 5
-`;
+      function enableMemorySaving(mtl) {
+          mtl.setConf('viewing_range', 85);
+          mtl.setConf('max_block_send_distance', 5);
+          mtl.setConf('max_block_generate_distance', 5);
+      }
 
       const launchForm = document.getElementById('launch_form');
       const joinForm = document.getElementById('join_form');
@@ -97,12 +105,22 @@
               select_proxy.appendChild(opt);
           });
 
+          const select_language = document.getElementById('select_language');
+          SUPPORTED_LANGUAGES.forEach(entry => {
+              const opt = document.createElement('option');
+              opt.value = entry[0];
+              opt.innerText = entry[1];
+              select_language.appendChild(opt);
+          });
+          select_language.value = getDefaultLanguage();
+
           const launch = document.getElementById('launch');
           launch.addEventListener('click', () => {
               const proxyIndex = document.getElementById('select_proxy').value;
               const proxy = proxies[proxyIndex][0];
               wipePage();
               mtl.setProxy(proxy);
+              mtl.setLang(select_language.value);
               mtl.launch(args);
           });
 
@@ -134,7 +152,8 @@
               args.go = true;
               history.pushState({}, "", `?proxy=${proxyIndex}&game=${game}&join=${clientCode}`);
               mtl.setVPN(serverCode, clientCode);
-              mtl.setMinetestConf(memorySavingConfig);
+              enableMemorySaving(mtl);
+              mtl.setLang(select_language.value);
               mtl.launch(args);
           });
 
@@ -156,7 +175,8 @@
               args.port = 30000;
               args.go = true;
               mtl.setVPN(null, join_code);
-              mtl.setMinetestConf(memorySavingConfig);
+              enableMemorySaving(mtl);
+              mtl.setLang(select_language.value);
               mtl.launch(args);
           });
       }
diff --git a/static/launcher.js b/static/launcher.js
index fb4bed2..0f6b610 100644
--- a/static/launcher.js
+++ b/static/launcher.js
@@ -576,7 +576,7 @@ class MinetestLauncher {
         this.proxyUrl = "wss://minetest.dustlabs.io/proxy";
         this.packsDir = DEFAULT_PACKS_DIR;
         this.packsDirIsCors = false;
-        this.minetestConf = null;
+        this.minetestConf = new Map();
 
         mtScheduler.addCondition("wasmReady", loadWasm);
         mtScheduler.addCondition("launch_called");
@@ -614,8 +614,27 @@ class MinetestLauncher {
         this.vpn = serverCode ? serverCode : clientCode;
     }
 
-    setMinetestConf(contents) {
-        this.minetestConf = contents;
+    // Set a key/value pair in minetest.conf
+    // Overrides previous values of the same key
+    setConf(key, value) {
+        key = key.toString();
+        value = value.toString();
+        this.minetestConf.set(key, value);
+    }
+
+    #renderMinetestConf() {
+        let lines = [];
+        for (const [k, v] of this.minetestConf.entries()) {
+            lines.push(`${k} = ${v}\n`);
+        }
+        return lines.join('');
+    }
+
+    setLang(lang) {
+        if (!SUPPORTED_LANGUAGES_MAP.has(lang)) {
+            alert(`Invalid code in setLang: ${lang}`);
+        }
+        this.setConf("language", lang);
     }
 
     // Returns pack status:
@@ -732,8 +751,10 @@ class MinetestLauncher {
         this.addPacks(this.args.packs);
         activateBody();
         fixGeometry();
-        if (this.minetestConf) {
-            const confBuf = stringToNewUTF8(this.minetestConf)
+        if (this.minetestConf.size > 0) {
+            const contents = this.#renderMinetestConf();
+            console.log("minetest.conf is: ", contents);
+            const confBuf = stringToNewUTF8(contents);
             emloop_set_minetest_conf(confBuf);
             _free(confBuf);
         }
@@ -755,3 +776,112 @@ class MinetestLauncher {
         mtScheduler.setCondition("launch_called");
     }
 }
+
+// Pulled from builtin/mainmenu/settings/dlg_settings.lua
+const SUPPORTED_LANGUAGES = [
+	['be', "Беларуская [be]"],
+	['bg', "Български [bg]"],
+	['ca', "Català [ca]"],
+	['cs', "Česky [cs]"],
+	['cy', "Cymraeg [cy]"],
+	['da', "Dansk [da]"],
+	['de', "Deutsch [de]"],
+	['el', "Ελληνικά [el]"],
+	['en', "English [en]"],
+	['eo', "Esperanto [eo]"],
+	['es', "Español [es]"],
+	['et', "Eesti [et]"],
+	['eu', "Euskara [eu]"],
+	['fi', "Suomi [fi]"],
+	['fil', "Wikang Filipino [fil]"],
+	['fr', "Français [fr]"],
+	['gd', "Gàidhlig [gd]"],
+	['gl', "Galego [gl]"],
+	['hu', "Magyar [hu]"],
+	['id', "Bahasa Indonesia [id]"],
+	['it', "Italiano [it]"],
+	['ja', "日本語 [ja]"],
+	['jbo', "Lojban [jbo]"],
+	['kk', "Қазақша [kk]"],
+	['ko', "한국어 [ko]"],
+	['ky', "Kırgızca / Кыргызча [ky]"],
+	['lt', "Lietuvių [lt]"],
+	['lv', "Latviešu [lv]"],
+	['mn', "Монгол [mn]"],
+	['mr', "मराठी [mr]"],
+	['ms', "Bahasa Melayu [ms]"],
+	['nb', "Norsk Bokmål [nb]"],
+	['nl', "Nederlands [nl]"],
+	['nn', "Norsk Nynorsk [nn]"],
+	['oc', "Occitan [oc]"],
+	['pl', "Polski [pl]"],
+	['pt', "Português [pt]"],
+	['pt_BR', "Português do Brasil [pt_BR]"],
+	['ro', "Română [ro]"],
+	['ru', "Русский [ru]"],
+	['sk', "Slovenčina [sk]"],
+	['sl', "Slovenščina [sl]"],
+	['sr_Cyrl', "Српски [sr_Cyrl]"],
+	['sr_Latn', "Srpski (Latinica) [sr_Latn]"],
+	['sv', "Svenska [sv]"],
+	['sw', "Kiswahili [sw]"],
+	['tr', "Türkçe [tr]"],
+	['tt', "Tatarça [tt]"],
+	['uk', "Українська [uk]"],
+	['vi', "Tiếng Việt [vi]"],
+	['zh_CN', "中文 (简体) [zh_CN]"],
+	['zh_TW', "正體中文 (繁體) [zh_TW]"],
+];
+
+const SUPPORTED_LANGUAGES_MAP = new Map(SUPPORTED_LANGUAGES);
+
+function getDefaultLanguage() {
+    const fuzzy = [];
+
+    const url_params = new URLSearchParams(window.location.search);
+    if (url_params.has("lang")) {
+        const lang = url_params.get("lang");
+        if (SUPPORTED_LANGUAGES_MAP.has(lang)) {
+            return lang;
+        }
+        alert(`Invalid lang parameter: ${lang}`);
+        return 'en';
+    }
+
+    for (let candidate of navigator.languages) {
+        candidate = candidate.replaceAll('-', '_');
+
+        if (SUPPORTED_LANGUAGES_MAP.has(candidate)) {
+            return candidate;
+        }
+
+        // Try stripping off the country code
+        const parts = candidate.split('_');
+        if (parts.length > 2) {
+            const rcandidate = parts.slice(0, 2).join('_');
+            if (SUPPORTED_LANGUAGES_MAP.has(rcandidate)) {
+                return rcandidate;
+            }
+        }
+
+        // Try just matching the language code
+        if (parts.length > 1) {
+            if (SUPPORTED_LANGUAGES_MAP.has(parts[0])) {
+                return parts[0];
+            }
+        }
+
+        // Try fuzzy match (ignore country code of both)
+        for (let entry of SUPPORTED_LANGUAGES) {
+            if (entry[0].split('_')[0] == parts[0]) {
+                fuzzy.push(entry[0]);
+            }
+        }
+    }
+
+    if (fuzzy.length > 0) {
+        return fuzzy[0];
+    }
+
+    return 'en';
+}