Use javascript markdown engine

2023-11-05 21:21:02 -07:00 · 2023-11-05 21:21:02 -07:00 · 32b4518bf7
commit 32b4518bf7
parent 9f7142b2ab
14 changed files with 3908 additions and 105 deletions
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@ -1,6 +1,6 @@
 import java.io.FileInputStream
 import java.io.FileNotFoundException
-import java.util.*
+import java.util.Properties

 plugins {
    id("com.android.application")
@ -133,7 +133,6 @@ dependencies {
    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
    implementation("com.google.android.material:material:1.9.0")
    implementation("androidx.legacy:legacy-support-v13:1.0.0")
-    implementation("com.commonsware.cwac:anddown:0.4.0")
    implementation("com.jakewharton.timber:timber:5.0.1")
    implementation("androidx.core:core-ktx:1.12.0")
    implementation("androidx.browser:browser:1.6.0")
--- a/app/src/main/assets/Cheatsheet.md
+++ b/app/src/main/assets/Cheatsheet.md
@ -90,11 +90,11 @@ data 1|data 2|data 3
 data 1|data 2|data 3
 ```

-Left Content|Center Content|Right Content
-:--------|:--------:|--------:
-data 1|data 2|data 3
-data 1|data 2|data 3
-data 1|data 2|data 3
+| Left Content | Center Content | Right Content |
+|:-------------|:--------------:|--------------:|
+| data 1       |     data 2     |        data 3 |
+| data 1       |     data 2     |        data 3 |
+| data 1       |     data 2     |        data 3 |

 ### Images

@ -116,7 +116,7 @@ In addition to the monospace inline element, code blocks can be created by inden

 Or by wrapping the code in three backticks (\`\`\`):

-```
+```javascript
 function helloWorld() {
    console.log("Hello, world!")
 }
--- a/app/src/main/assets/highlight.css
+++ b/app/src/main/assets/highlight.css
@ -0,0 +1,9 @@
+/*!
+  Theme: Default
+  Description: Original highlight.js style
+  Author: (c) Ivan Sagalaev <maniac@softwaremaniacs.org>
+  Maintainer: @highlightjs/core-team
+  Website: https://highlightjs.org/
+  License: see project LICENSE
+  Touched: 2021
+*/pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}.hljs{background:#f3f3f3;color:#444}.hljs-comment{color:#697070}.hljs-punctuation,.hljs-tag{color:#444a}.hljs-tag .hljs-attr,.hljs-tag .hljs-name{color:#444}.hljs-attribute,.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-name,.hljs-selector-tag{font-weight:700}.hljs-deletion,.hljs-number,.hljs-quote,.hljs-selector-class,.hljs-selector-id,.hljs-string,.hljs-template-tag,.hljs-type{color:#800}.hljs-section,.hljs-title{color:#800;font-weight:700}.hljs-link,.hljs-operator,.hljs-regexp,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-symbol,.hljs-template-variable,.hljs-variable{color:#ab5656}.hljs-literal{color:#695}.hljs-addition,.hljs-built_in,.hljs-bullet,.hljs-code{color:#397300}.hljs-meta{color:#1f7199}.hljs-meta .hljs-string{color:#38a}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}
--- a/app/src/main/assets/highlight.js
+++ b/app/src/main/assets/highlight.js
--- a/app/src/main/assets/markdown.js
+++ b/app/src/main/assets/markdown.js
@ -0,0 +1,14 @@
+const localMarked = new marked.Marked(
+  markedHighlight.markedHighlight({
+    langPrefix: 'hljs language-',
+    highlight(code, lang) {
+        console.log(`highlighing code with $lang`)
+      const language = hljs.getLanguage(lang) ? lang : 'plaintext';
+      return hljs.highlight(code, { language }).value;
+    }
+  })
+);
+
+function setMarkdown(markdown) {
+    document.getElementById('content').innerHTML = marked.parse(markdown)
+}
--- a/app/src/main/assets/marked-highlight.js
+++ b/app/src/main/assets/marked-highlight.js
@ -0,0 +1,96 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+  typeof define === 'function' && define.amd ? define(['exports'], factory) :
+  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.markedHighlight = {}));
+})(this, (function (exports) { 'use strict';
+
+  function markedHighlight(options) {
+    if (typeof options === 'function') {
+      options = {
+        highlight: options
+      };
+    }
+
+    if (!options || typeof options.highlight !== 'function') {
+      throw new Error('Must provide highlight function');
+    }
+
+    if (typeof options.langPrefix !== 'string') {
+      options.langPrefix = 'language-';
+    }
+
+    return {
+      async: !!options.async,
+      walkTokens(token) {
+        if (token.type !== 'code') {
+          return;
+        }
+
+        const lang = getLang(token);
+
+        if (options.async) {
+          return Promise.resolve(options.highlight(token.text, lang)).then(updateToken(token));
+        }
+
+        const code = options.highlight(token.text, lang);
+        if (code instanceof Promise) {
+          throw new Error('markedHighlight is not set to async but the highlight function is async. Set the async option to true on markedHighlight to await the async highlight function.');
+        }
+        updateToken(token)(code);
+      },
+      renderer: {
+        code(code, infoString, escaped) {
+          const lang = (infoString || '').match(/\S*/)[0];
+          const classAttr = lang
+            ? ` class="${options.langPrefix}${escape(lang)}"`
+            : '';
+          code = code.replace(/\n$/, '');
+          return `<pre><code${classAttr}>${escaped ? code : escape(code, true)}\n</code></pre>`;
+        }
+      }
+    };
+  }
+
+  function getLang(token) {
+    return (token.lang || '').match(/\S*/)[0];
+  }
+
+  function updateToken(token) {
+    return (code) => {
+      if (typeof code === 'string' && code !== token.text) {
+        token.escaped = true;
+        token.text = code;
+      }
+    };
+  }
+
+  // copied from marked helpers
+  const escapeTest = /[&<>"']/;
+  const escapeReplace = new RegExp(escapeTest.source, 'g');
+  const escapeTestNoEncode = /[<>"']|&(?!(#\d{1,7}|#[Xx][a-fA-F0-9]{1,6}|\w+);)/;
+  const escapeReplaceNoEncode = new RegExp(escapeTestNoEncode.source, 'g');
+  const escapeReplacements = {
+    '&': '&amp;',
+    '<': '&lt;',
+    '>': '&gt;',
+    '"': '&quot;',
+    "'": '&#39;'
+  };
+  const getEscapeReplacement = (ch) => escapeReplacements[ch];
+  function escape(html, encode) {
+    if (encode) {
+      if (escapeTest.test(html)) {
+        return html.replace(escapeReplace, getEscapeReplacement);
+      }
+    } else {
+      if (escapeTestNoEncode.test(html)) {
+        return html.replace(escapeReplaceNoEncode, getEscapeReplacement);
+      }
+    }
+
+    return html;
+  }
+
+  exports.markedHighlight = markedHighlight;
+
+}));
--- a/app/src/main/assets/marked.js
+++ b/app/src/main/assets/marked.js
--- a/app/src/main/java/com/wbrawner/simplemarkdown/MainActivity.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/MainActivity.kt
@ -20,13 +20,13 @@ import androidx.compose.material.icons.filled.Help
 import androidx.compose.material.icons.filled.Info
 import androidx.compose.material.icons.filled.PrivacyTip
 import androidx.compose.material.icons.filled.Settings
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.core.app.ActivityCompat
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.core.view.WindowCompat
-import androidx.lifecycle.lifecycleScope
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
@ -39,42 +39,18 @@ import com.wbrawner.simplemarkdown.ui.SettingsScreen
 import com.wbrawner.simplemarkdown.ui.SupportScreen
 import com.wbrawner.simplemarkdown.ui.theme.SimpleMarkdownTheme
 import com.wbrawner.simplemarkdown.utility.Preference
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext

 class MainActivity : AppCompatActivity(), ActivityCompat.OnRequestPermissionsResultCallback {
-    private val viewModel: MarkdownViewModel by viewModels { MarkdownViewModel.factory(fileHelper, preferenceHelper) }
+    private val viewModel: MarkdownViewModel by viewModels {
+        MarkdownViewModel.factory(
+            fileHelper,
+            preferenceHelper
+        )
+    }

    override fun onCreate(savedInstanceState: Bundle?) {
        installSplashScreen()
        super.onCreate(savedInstanceState)
-        lifecycleScope.launch {
-            val darkMode = withContext(Dispatchers.IO) {
-                val darkModeValue = preferenceHelper[Preference.DARK_MODE] as String
-
-                return@withContext when {
-                    darkModeValue.equals(
-                        getString(R.string.pref_value_light),
-                        ignoreCase = true
-                    ) -> AppCompatDelegate.MODE_NIGHT_NO
-
-                    darkModeValue.equals(
-                        getString(R.string.pref_value_dark),
-                        ignoreCase = true
-                    ) -> AppCompatDelegate.MODE_NIGHT_YES
-
-                    else -> {
-                        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.P) {
-                            AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY
-                        } else {
-                            AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
-                        }
-                    }
-                }
-            }
-            AppCompatDelegate.setDefaultNightMode(darkMode)
-        }
        WindowCompat.setDecorFitsSystemWindows(window, false)
        val preferences = mutableMapOf<String, String>()
        preferences["Autosave"] = preferenceHelper[Preference.AUTOSAVE_ENABLED].toString()
@ -90,19 +66,45 @@ class MainActivity : AppCompatActivity(), ActivityCompat.OnRequestPermissionsRes
                .collectAsState()
            val readabilityEnabled by preferenceHelper.observe<Boolean>(Preference.READABILITY_ENABLED)
                .collectAsState()
+            val darkModePreference by preferenceHelper.observe<String>(Preference.DARK_MODE)
+                .collectAsState()
+            LaunchedEffect(darkModePreference) {
+                val darkMode = when {
+                    darkModePreference.equals(
+                        getString(R.string.pref_value_light),
+                        ignoreCase = true
+                    ) -> AppCompatDelegate.MODE_NIGHT_NO
+
+                    darkModePreference.equals(
+                        getString(R.string.pref_value_dark),
+                        ignoreCase = true
+                    ) -> AppCompatDelegate.MODE_NIGHT_YES
+
+                    else -> {
+                        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.P) {
+                            AppCompatDelegate.MODE_NIGHT_AUTO_BATTERY
+                        } else {
+                            AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM
+                        }
+                    }
+                }
+                AppCompatDelegate.setDefaultNightMode(darkMode)
+            }
            SimpleMarkdownTheme {
                val navController = rememberNavController()
                NavHost(
                    navController = navController,
                    startDestination = Route.EDITOR.path,
-                    enterTransition = { fadeIn(
+                    enterTransition = {
+                        fadeIn(
                            animationSpec = tween(
                                300, easing = LinearEasing
                            )
                        ) + slideIntoContainer(
                            animationSpec = tween(300, easing = EaseIn),
                            towards = AnimatedContentTransitionScope.SlideDirection.Start
-                    ) },
+                        )
+                    },
                    popEnterTransition = { EnterTransition.None },
                    popExitTransition = {
                        fadeOut(
@ -120,7 +122,8 @@ class MainActivity : AppCompatActivity(), ActivityCompat.OnRequestPermissionsRes
                            navController = navController,
                            viewModel = viewModel,
                            enableAutosave = autosaveEnabled,
-                            enableReadability = readabilityEnabled
+                            enableReadability = readabilityEnabled,
+                            darkMode = darkModePreference
                        )
                    }
                    composable(Route.SETTINGS.path) {
@ -130,13 +133,25 @@ class MainActivity : AppCompatActivity(), ActivityCompat.OnRequestPermissionsRes
                        SupportScreen(navController = navController)
                    }
                    composable(Route.HELP.path) {
-                        MarkdownInfoScreen(title = Route.HELP.title, file = "Cheatsheet.md", navController = navController)
+                        MarkdownInfoScreen(
+                            title = Route.HELP.title,
+                            file = "Cheatsheet.md",
+                            navController = navController
+                        )
                    }
                    composable(Route.ABOUT.path) {
-                        MarkdownInfoScreen(title = Route.ABOUT.title, file = "Libraries.md", navController = navController)
+                        MarkdownInfoScreen(
+                            title = Route.ABOUT.title,
+                            file = "Libraries.md",
+                            navController = navController
+                        )
                    }
                    composable(Route.PRIVACY.path) {
-                        MarkdownInfoScreen(title = Route.PRIVACY.title, file = "Privacy Policy.md", navController = navController)
+                        MarkdownInfoScreen(
+                            title = Route.PRIVACY.title,
+                            file = "Privacy Policy.md",
+                            navController = navController
+                        )
                    }
                }
            }
--- a/app/src/main/java/com/wbrawner/simplemarkdown/MarkdownViewModel.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/MarkdownViewModel.kt
@ -33,6 +33,12 @@ class MarkdownViewModel(
    val effects = _effects.asSharedFlow()
    private val saveMutex = Mutex()

+    init {
+        viewModelScope.launch {
+            load(null)
+        }
+    }
+
    suspend fun updateMarkdown(markdown: String?) {
        this@MarkdownViewModel._markdown.emit(markdown ?: "")
        isDirty.set(true)
--- a/app/src/main/java/com/wbrawner/simplemarkdown/ui/MainScreen.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/ui/MainScreen.kt
@ -9,10 +9,11 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.RowScope
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.pager.HorizontalPager
 import androidx.compose.foundation.pager.rememberPagerState
-import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
@ -38,6 +39,7 @@ import androidx.compose.material3.TabRow
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
 import androidx.compose.material3.TextField
+import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.rememberDrawerState
 import androidx.compose.runtime.Composable
@ -51,8 +53,8 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.TextStyle
@ -78,6 +80,7 @@ fun MainScreen(
    viewModel: MarkdownViewModel,
    enableAutosave: Boolean,
    enableReadability: Boolean,
+    darkMode: String,
 ) {
    var lockSwiping by remember { mutableStateOf(false) }
    val coroutineScope = rememberCoroutineScope()
@ -242,8 +245,15 @@ fun MainScreen(
                    if (page == 0) {
                        TextField(
                            modifier = Modifier
-                                .fillMaxSize()
-                                .padding(8.dp),
+                                .fillMaxSize(),
+                            colors = TextFieldDefaults.colors(
+                                focusedContainerColor = MaterialTheme.colorScheme.surface,
+                                unfocusedContainerColor = MaterialTheme.colorScheme.surface,
+                                disabledIndicatorColor = Color.Transparent,
+                                errorIndicatorColor = Color.Transparent,
+                                focusedIndicatorColor = Color.Transparent,
+                                unfocusedIndicatorColor = Color.Transparent
+                            ),
                            value = textFieldValue,
                            onValueChange = {
                                textFieldValue = if (enableReadability) {
@ -265,7 +275,7 @@ fun MainScreen(
                            keyboardOptions = KeyboardOptions(capitalization = KeyboardCapitalization.Sentences)
                        )
                    } else {
-                        MarkdownPreview(modifier = Modifier.fillMaxSize(), markdown)
+                        MarkdownPreview(modifier = Modifier.fillMaxSize(), markdown, darkMode)
                    }
                }
            }
@ -293,6 +303,21 @@ fun MarkdownNavigationDrawer(
    val coroutineScope = rememberCoroutineScope()
    DismissibleNavigationDrawer(drawerState = drawerState, drawerContent = {
        DismissibleDrawerSheet {
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                Icon(
+                    modifier = Modifier.size(96.dp),
+                    painter = painterResource(R.drawable.ic_launcher_foreground),
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onSurface
+                )
+                Text(
+                    text = "Simple Markdown",
+                    style = MaterialTheme.typography.titleLarge
+                )
+            }
            Route.entries.forEach { route ->
                if (route == Route.EDITOR) {
                    return@forEach
--- a/app/src/main/java/com/wbrawner/simplemarkdown/ui/MarkdownInfoScreen.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/ui/MarkdownInfoScreen.kt
@ -5,10 +5,8 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
-import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.navigation.NavController
@ -30,15 +28,16 @@ fun MarkdownInfoScreen(
        }
    ) { paddingValues ->
        val context = LocalContext.current
-        var markdown by remember { mutableStateOf("") }
+        val (markdown, setMarkdown) = remember { mutableStateOf("") }
        LaunchedEffect(file) {
-            markdown = context.assets.readAssetToString(file)?.toHtml()?: "Failed to load $file"
+            setMarkdown(context.assets.readAssetToString(file)?.toHtml() ?: "Failed to load $file")
        }
        MarkdownPreview(
            modifier = Modifier
                .fillMaxSize()
                .padding(paddingValues),
-            markdown = markdown
+            markdown = markdown,
+            "Auto"
        )
    }
 }
--- a/app/src/main/java/com/wbrawner/simplemarkdown/ui/MarkdownPreview.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/ui/MarkdownPreview.kt
@ -1,69 +1,93 @@
 package com.wbrawner.simplemarkdown.ui

-import android.content.res.Configuration
+import android.content.Context
+import android.view.ViewGroup
 import android.webkit.WebView
-import androidx.appcompat.app.AppCompatDelegate
-import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.viewinterop.AndroidView
-import androidx.preference.PreferenceManager
 import com.wbrawner.simplemarkdown.BuildConfig
-import com.wbrawner.simplemarkdown.R
-import com.wbrawner.simplemarkdown.utility.toHtml
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import java.io.Reader

+private const val container = "<main id=\"content\"></main>"
+
+@OptIn(ExperimentalStdlibApi::class)
@Composable
-fun MarkdownPreview(modifier: Modifier = Modifier, markdown: String) {
-    val coroutineScope = rememberCoroutineScope()
-    val context = LocalContext.current
-    var style by remember { mutableStateOf("") }
-    LaunchedEffect(context) {
-        val isNightMode = AppCompatDelegate.getDefaultNightMode() ==
-                AppCompatDelegate.MODE_NIGHT_YES
-                || context.resources.configuration.uiMode and Configuration.UI_MODE_NIGHT_MASK == Configuration.UI_MODE_NIGHT_YES
-        val defaultCssId = if (isNightMode) {
-            R.string.pref_custom_css_default_dark
-        } else {
-            R.string.pref_custom_css_default
+fun MarkdownPreview(modifier: Modifier = Modifier, markdown: String, darkMode: String) {
+    val materialColors = MaterialTheme.colorScheme
+    val style = remember(darkMode) {
+        """body {
+            |   background: #${materialColors.surface.toArgb().toHexString().substring(2)};
+            |   color: #${materialColors.onSurface.toArgb().toHexString().substring(2)};
+            |}
+            |pre {
+            |   background: #${materialColors.surfaceVariant.toArgb().toHexString().substring(2)};
+            |   color: #${materialColors.onSurfaceVariant.toArgb().toHexString().substring(2)};
+            |}""".trimMargin().wrapTag("style")
    }
-        val css = withContext(Dispatchers.IO) {
-            @Suppress("ConstantConditionIf")
-            if (!BuildConfig.ENABLE_CUSTOM_CSS) {
-                context.getString(defaultCssId)
-            } else {
-                PreferenceManager.getDefaultSharedPreferences(context)
-                    .getString(
-                        context.getString(R.string.pref_custom_css),
-                        context.getString(defaultCssId)
+    var marked by remember { mutableStateOf("") }
+    var markedHighlight by remember { mutableStateOf("") }
+    var highlightJs by remember { mutableStateOf("") }
+    var highlightCss by remember { mutableStateOf("") }
+    var markdownJs by remember { mutableStateOf("") }
+    val markdownUpdateJs by remember(markdown) {
+        mutableStateOf(
+            "setMarkdown(`${
+                markdown.replace(
+                    "`",
+                    "\\`"
+                )
+            }`)".wrapTag("script")
        )
    }
+    val context = LocalContext.current
+    LaunchedEffect(context) {
+        withContext(Dispatchers.IO) {
+            marked = context.assetToString("marked.js").wrapTag("script")
+            markedHighlight = context.assetToString("marked-highlight.js").wrapTag("script")
+            highlightJs = context.assetToString("highlight.js").wrapTag("script")
+            highlightCss = context.assetToString("highlight.css").wrapTag("style")
+            markdownJs = context.assetToString("markdown.js").wrapTag("script")
        }
-        style = "<style>$css</style>"
    }
    AndroidView(
        modifier = modifier,
        factory = { context ->
-            WebView(context)
-        },
-        update = { preview ->
-            coroutineScope.launch {
-                preview.loadDataWithBaseURL(null,
-                    style + markdown.toHtml(),
-                    "text/html",
-                    "UTF-8", null
+            val content =
+                highlightCss + style + container + marked + markedHighlight + highlightJs + markdownJs + markdownUpdateJs
+
+            WebView(context).apply {
+                WebView.setWebContentsDebuggingEnabled(BuildConfig.DEBUG)
+                layoutParams = ViewGroup.LayoutParams(
+                    ViewGroup.LayoutParams.MATCH_PARENT,
+                    ViewGroup.LayoutParams.WRAP_CONTENT
                )
-                preview.setBackgroundColor(0x01000000)
+                setBackgroundColor(Color.Transparent.toArgb())
+                isNestedScrollingEnabled = false
+                settings.javaScriptEnabled = true
+                loadDataWithBaseURL(null, content, "text/html", "UTF-8", null)
            }
+        },
+        update = { webView ->
+            val content =
+                highlightCss + style + container + marked + markedHighlight + highlightJs + markdownJs + markdownUpdateJs
+            webView.loadDataWithBaseURL(null, content, "text/html", "UTF-8", null)
        }
    )
 }
+
+private fun String.wrapTag(tag: String) = "<$tag>$this</$tag>"
+
+private fun Context.assetToString(fileName: String): String =
+    assets.open(fileName).reader().use(Reader::readText)
--- a/app/src/main/java/com/wbrawner/simplemarkdown/utility/FileHelper.kt
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/utility/FileHelper.kt
@ -1,7 +1,7 @@
 package com.wbrawner.simplemarkdown.utility

 import android.content.Context
-import android.net.Uri
+import android.content.Intent
 import androidx.core.net.toUri
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
@ -36,6 +36,10 @@ class AndroidFileHelper(private val context: Context) : FileHelper {

    override suspend fun open(source: URI): Pair<String, String>? = withContext(Dispatchers.IO) {
        val uri = source.toString().toUri()
+        context.contentResolver.takePersistableUriPermission(
+            uri,
+            Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+        )
        context.contentResolver.openFileDescriptor(uri, "r")
            ?.use {
                uri.getName(context) to FileInputStream(it.fileDescriptor).reader()
--- a/build.gradle.kts
+++ b/build.gradle.kts
@ -17,9 +17,6 @@ allprojects {
    repositories {
        google()
        mavenCentral()
-        maven {
-            url = uri("https://s3.amazonaws.com/repo.commonsware.com/")
-        }
        maven {
            url = uri("https://s01.oss.sonatype.org/content/repositories/snapshots/")
        }