Merge pull request #4017 from mueller-ma/render-markdown

Render markdown files

Author: JuancaG05

build.gradle

@@ -21,6 +21,9 @@ buildscript {
         // Koin
         ioInsertKoin = "3.3.3"
 
+        // Markwon
+        markwon = "4.6.2"
+
         // Moshi
         comSquareupMoshi = '1.14.0'
 

owncloudApp/build.gradle

@@ -56,6 +56,13 @@ dependencies {
     implementation "com.google.android.material:material:1.8.0"
     implementation "com.jakewharton:disklrucache:2.0.2"
 
+    // Markdown Preview
+    implementation "io.noties.markwon:core:$markwon"
+    implementation "io.noties.markwon:ext-tables:$markwon"
+    implementation "io.noties.markwon:ext-strikethrough:$markwon"
+    implementation "io.noties.markwon:ext-tasklist:$markwon"
+    implementation "io.noties.markwon:html:$markwon"
+
     // Tests
     testImplementation project(":owncloudTestUtil")
     testImplementation "androidx.arch.core:core-testing:$androidxArchCore"

owncloudApp/src/main/java/com/owncloud/android/ui/preview/PreviewTextFragment.java

@@ -21,6 +21,7 @@
 package com.owncloud.android.ui.preview;
 
 import android.accounts.Account;
+import android.content.Context;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.view.LayoutInflater;
@@ -48,6 +49,11 @@
 import com.owncloud.android.ui.dialog.LoadingDialog;
 import com.owncloud.android.ui.fragment.FileFragment;
 import com.owncloud.android.utils.PreferenceUtils;
+import io.noties.markwon.Markwon;
+import io.noties.markwon.ext.strikethrough.StrikethroughPlugin;
+import io.noties.markwon.ext.tables.TablePlugin;
+import io.noties.markwon.ext.tasklist.TaskListPlugin;
+import io.noties.markwon.html.HtmlPlugin;
 import timber.log.Timber;
 
 import java.io.BufferedWriter;
@@ -180,7 +186,7 @@ public void onStart() {
 
     private void loadAndShowTextPreview() {
         mTextLoadTask = new TextLoadAsyncTask(new WeakReference<>(mTextPreview));
-        mTextLoadTask.execute(getFile().getStoragePath());
+        mTextLoadTask.execute(getFile());
     }
 
     /**
@@ -189,6 +195,7 @@ private void loadAndShowTextPreview() {
     private class TextLoadAsyncTask extends AsyncTask<Object, Void, StringWriter> {
         private final String DIALOG_WAIT_TAG = "DIALOG_WAIT";
         private final WeakReference<TextView> mTextViewReference;
+        private String mimeType;
 
         private TextLoadAsyncTask(WeakReference<TextView> textView) {
             mTextViewReference = textView;
@@ -205,7 +212,9 @@ protected StringWriter doInBackground(java.lang.Object... params) {
                 throw new IllegalArgumentException("The parameter to " + TextLoadAsyncTask.class.getName() + " must " +
                         "be (1) the file location");
             }
-            final String location = (String) params[0];
+            final OCFile file = (OCFile) params[0];
+            final String location = file.getStoragePath();
+            mimeType = file.getMimeType();
 
             FileInputStream inputStream = null;
             Scanner sc = null;
@@ -247,7 +256,20 @@ protected void onPostExecute(final StringWriter stringWriter) {
             final TextView textView = mTextViewReference.get();
 
             if (textView != null) {
-                textView.setText(new String(stringWriter.getBuffer()));
+                String text = new String(stringWriter.getBuffer());
+                if (mimeType.equals("text/markdown")) {
+                    Context context = textView.getContext();
+                    Markwon markwon = Markwon
+                            .builder(context)
+                            .usePlugin(TablePlugin.create(context))
+                            .usePlugin(StrikethroughPlugin.create())
+                            .usePlugin(TaskListPlugin.create(context))
+                            .usePlugin(HtmlPlugin.create())
+                            .build();
+                    markwon.setMarkdown(textView, text);
+                } else {
+                    textView.setText(text);
+                }
                 textView.setVisibility(View.VISIBLE);
             }