Gate LaTeX maths behind labs flag

vector/src/main/java/im/vector/app/features/html/EventHtmlRenderer.kt

@@ -20,6 +20,7 @@ import android.content.Context
 import android.text.Spannable
 import androidx.core.text.toSpannable
 import im.vector.app.core.resources.ColorProvider
+import im.vector.app.features.settings.VectorPreferences
 import io.noties.markwon.AbstractMarkwonPlugin
 import io.noties.markwon.Markwon
 import io.noties.markwon.MarkwonPlugin
@@ -34,14 +35,18 @@ import javax.inject.Singleton
 
 @Singleton
 class EventHtmlRenderer @Inject constructor(htmlConfigure: MatrixHtmlPluginConfigure,
-                                            context: Context) {
+                                            context: Context,
+                                            private val vectorPreferences: VectorPreferences) {
 
     interface PostProcessor {
         fun afterRender(renderedText: Spannable)
     }
 
-    private val markwon = Markwon.builder(context)
+    private val builder = Markwon.builder(context)
             .usePlugin(HtmlPlugin.create(htmlConfigure))
+
+    private val markwon = if (vectorPreferences.latexMathsIsEnabled()) {
+        builder
                 .usePlugin(object : AbstractMarkwonPlugin() { // Markwon expects maths to be in a specific format: https://noties.io/Markwon/docs/v4/ext-latex
                     override fun processMarkdown(markdown: String): String {
                         return markdown
@@ -54,7 +59,9 @@ class EventHtmlRenderer @Inject constructor(htmlConfigure: MatrixHtmlPluginConfi
                     builder.inlinesEnabled(true)
                     builder.theme().inlinePadding(JLatexMathTheme.Padding.symmetric(24, 8))
                 })
-            .build()
+    } else {
+        builder
+    }.build()
 
     val plugins: List<MarkwonPlugin> = markwon.plugins
 

vector/src/main/java/im/vector/app/features/settings/VectorPreferences.kt

@@ -100,6 +100,7 @@ class VectorPreferences @Inject constructor(private val context: Context) {
         private const val SETTINGS_SEND_MESSAGE_WITH_ENTER = "SETTINGS_SEND_MESSAGE_WITH_ENTER"
         private const val SETTINGS_ENABLE_CHAT_EFFECTS = "SETTINGS_ENABLE_CHAT_EFFECTS"
         private const val SETTINGS_SHOW_EMOJI_KEYBOARD = "SETTINGS_SHOW_EMOJI_KEYBOARD"
+        private const val SETTINGS_LABS_ENABLE_LATEX_MATHS = "SETTINGS_LABS_ENABLE_LATEX_MATHS"
 
         // Room directory
         private const val SETTINGS_ROOM_DIRECTORY_SHOW_ALL_PUBLIC_ROOMS = "SETTINGS_ROOM_DIRECTORY_SHOW_ALL_PUBLIC_ROOMS"
@@ -337,6 +338,10 @@ class VectorPreferences @Inject constructor(private val context: Context) {
         return defaultPrefs.getBoolean(SETTINGS_LABS_UNREAD_NOTIFICATIONS_AS_TAB, false)
     }
 
+    fun latexMathsIsEnabled(): Boolean {
+        return defaultPrefs.getBoolean(SETTINGS_LABS_ENABLE_LATEX_MATHS, false)
+    }
+
     fun failFast(): Boolean {
         return BuildConfig.DEBUG || (developerMode() && defaultPrefs.getBoolean(SETTINGS_DEVELOPER_MODE_FAIL_FAST_PREFERENCE_KEY, false))
     }

vector/src/main/res/values/strings.xml

@@ -3595,4 +3595,5 @@
     <string name="link_this_email_settings_link">Link this email with your account</string>
     <!-- %s will be replaced by the value of link_this_email_settings_link and styled as a link -->
     <string name="link_this_email_with_your_account">%s in Settings to receive invites directly in Element.</string>
+    <string name="labs_enable_latex_maths">Enable LaTeX mathematics</string>
 </resources>

vector/src/main/res/xml/vector_settings_labs.xml

@@ -50,6 +50,11 @@
         android:key="SETTINGS_LABS_USE_RESTRICTED_JOIN_RULE"
         android:title="@string/labs_use_restricted_join_rule"
         android:summary="@string/labs_use_restricted_join_rule_desc"/>
+
+    <im.vector.app.core.preference.VectorSwitchPreference
+        android:defaultValue="false"
+        android:key="SETTINGS_LABS_ENABLE_LATEX_MATHS"
+        android:title="@string/labs_enable_latex_maths"/>
     <!--</im.vector.app.core.preference.VectorPreferenceCategory>-->