Stole compose-markdown

Stolen from https://github.com/boswelja/NASdroid/tree/main/core/compose-markdown.

compose-markdown/build.gradle.kts

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+plugins {
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.kotlin)
+
+    alias(libs.plugins.detekt)
+}
+
+android {
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+
+    buildFeatures {
+        compose = true
+    }
+
+    composeOptions {
+        kotlinCompilerExtensionVersion = libs.versions.composeCompiler.get()
+    }
+
+    namespace = "com.imashnake.animite.compose.markdown"
+}
+
+kotlin {
+    jvmToolchain(17)
+}
+
+dependencies {
+    implementation(libs.bundles.compose)
+
+    implementation(libs.intellij.markdown)
+    implementation(libs.coil.compose)
+    implementation(libs.coil.gif)
+    implementation(libs.coil.svg)
+
+    debugImplementation(libs.compose.ui.tooling)
+    implementation(libs.compose.ui.toolingPreview)
+}

compose-markdown/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.INTERNET" />
+</manifest>

compose-markdown/src/main/kotlin/com/nasdroid/core/markdown/MarkdownDocument.kt

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+package com.nasdroid.core.markdown
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.TextUnit
+import androidx.compose.ui.unit.dp
+import com.nasdroid.core.markdown.components.MarkdownBlockQuote
+import com.nasdroid.core.markdown.components.MarkdownCodeBlock
+import com.nasdroid.core.markdown.components.MarkdownHeading
+import com.nasdroid.core.markdown.components.MarkdownHtmlBlock
+import com.nasdroid.core.markdown.components.MarkdownOrderedList
+import com.nasdroid.core.markdown.components.MarkdownParagraph
+import com.nasdroid.core.markdown.components.MarkdownRule
+import com.nasdroid.core.markdown.components.MarkdownTable
+import com.nasdroid.core.markdown.components.MarkdownUnorderedList
+import com.nasdroid.core.markdown.generator.MarkdownBlockQuote
+import com.nasdroid.core.markdown.generator.MarkdownCodeBlock
+import com.nasdroid.core.markdown.generator.MarkdownHeading
+import com.nasdroid.core.markdown.generator.MarkdownHtmlBlock
+import com.nasdroid.core.markdown.generator.MarkdownNode
+import com.nasdroid.core.markdown.generator.MarkdownNodeGenerator
+import com.nasdroid.core.markdown.generator.MarkdownOrderedList
+import com.nasdroid.core.markdown.generator.MarkdownParagraph
+import com.nasdroid.core.markdown.generator.MarkdownRule
+import com.nasdroid.core.markdown.generator.MarkdownTable
+import com.nasdroid.core.markdown.generator.MarkdownUnorderedList
+import com.nasdroid.core.markdown.style.BlockQuoteStyle
+import com.nasdroid.core.markdown.style.CodeBlockStyle
+import com.nasdroid.core.markdown.style.TextStyleModifiers
+import com.nasdroid.core.markdown.style.TextStyles
+import com.nasdroid.core.markdown.style.m3BlockQuoteStyle
+import com.nasdroid.core.markdown.style.m3CodeBlockStyle
+import com.nasdroid.core.markdown.style.m3TextStyleModifiers
+import com.nasdroid.core.markdown.style.m3TextStyles
+import org.intellij.markdown.flavours.gfm.GFMFlavourDescriptor
+import org.intellij.markdown.parser.MarkdownParser
+
+/**
+ * Displays a Markdown document.
+ */
+@Composable
+fun MarkdownDocument(
+    markdown: String,
+    textStyles: TextStyles,
+    textStyleModifiers: TextStyleModifiers,
+    blockQuoteStyle: BlockQuoteStyle,
+    codeBlockStyle: CodeBlockStyle,
+    modifier: Modifier = Modifier,
+    sectionSpacing: Dp = textStyles.textStyle.fontSize.toDp()
+) {
+    val parsedMarkdownNodes = remember(markdown) {
+        val flavor = GFMFlavourDescriptor()
+        val tree = MarkdownParser(flavor).buildMarkdownTreeFromString(markdown)
+        MarkdownNodeGenerator(markdown, tree).generateNodes()
+    }
+    Column(
+        modifier = modifier,
+        verticalArrangement = Arrangement.spacedBy(sectionSpacing)
+    ) {
+        parsedMarkdownNodes.forEach {
+            MarkdownNode(
+                node = it,
+                textStyles = textStyles,
+                textStyleModifiers = textStyleModifiers,
+                blockQuoteStyle = blockQuoteStyle,
+                codeBlockStyle = codeBlockStyle
+            )
+        }
+    }
+}
+
+@Composable
+internal fun TextUnit.toDp(): Dp {
+    return with(LocalDensity.current) {
+        this@toDp.toPx().toDp()
+    }
+}
+
+@Composable
+internal fun MarkdownNode(
+    node: MarkdownNode,
+    textStyles: TextStyles,
+    textStyleModifiers: TextStyleModifiers,
+    blockQuoteStyle: BlockQuoteStyle,
+    codeBlockStyle: CodeBlockStyle,
+    modifier: Modifier = Modifier
+) {
+    when (node) {
+        is MarkdownBlockQuote -> MarkdownBlockQuote(
+            blockQuote = node,
+            style = blockQuoteStyle,
+            textStyles = textStyles,
+            textStyleModifiers = textStyleModifiers,
+            codeBlockStyle = codeBlockStyle,
+            modifier = modifier,
+        )
+        is MarkdownCodeBlock -> MarkdownCodeBlock(
+            codeBlock = node,
+            style = codeBlockStyle,
+            textStyle = textStyles.textStyle.copy(fontFamily = FontFamily.Monospace),
+            modifier = modifier,
+        )
+        is MarkdownHeading -> MarkdownHeading(
+            heading = node,
+            modifier = modifier,
+            textStyles = textStyles,
+            textStyleModifiers = textStyleModifiers,
+        )
+        is MarkdownOrderedList -> MarkdownOrderedList(
+            list = node,
+            textStyles = textStyles,
+            textStyleModifiers = textStyleModifiers,
+            blockQuoteStyle = blockQuoteStyle,
+            codeBlockStyle = codeBlockStyle,
+            modifier = modifier
+        )
+        is MarkdownParagraph -> MarkdownParagraph(
+            paragraph = node,
+            textStyle = textStyles.textStyle,
+            textStyleModifiers = textStyleModifiers,
+            modifier = modifier
+        )
+        MarkdownRule -> MarkdownRule(modifier = modifier)
+        is MarkdownTable -> MarkdownTable(
+            table = node,
+            textStyle = textStyles.textStyle,
+            textStyleModifiers = textStyleModifiers,
+            modifier = modifier
+        )
+        is MarkdownHtmlBlock -> MarkdownHtmlBlock(
+            htmlBlock = node,
+            textStyle = textStyles.textStyle,
+            modifier = modifier
+        )
+        is MarkdownUnorderedList -> MarkdownUnorderedList(
+            list = node,
+            textStyles = textStyles,
+            textStyleModifiers = textStyleModifiers,
+            blockQuoteStyle = blockQuoteStyle,
+            codeBlockStyle = codeBlockStyle,
+            modifier = modifier
+        )
+    }
+}
+
+@Preview(showBackground = true, heightDp = 1900)
+@Composable
+fun MarkdownTextPreview() {
+    MarkdownDocument(markdown = """
+        # H1        
+        H1
+        ==
+        ## H2
+        H2
+        --
+        ### H3
+        #### H4
+        ##### H5
+        ###### H6
+
+        One line
+
+        Two
+        lines
+
+        _italics_
+        *italics*
+
+        __bold__
+        **bold**
+
+        ~~strikethrough~~
+
+        [anilist link](https://anilist.co/)
+        https://anilist.co/
+        <https://anilist.co/>
+
+        ![anilist icon](https://anilist.co/img/icons/icon.svg)
+        ![image](https://picsum.photos/50)
+
+        ---
+        ***
+
+        > block quote
+        
+        >> nested block quote
+
+        table | with | content
+        --- | --- | ---
+        content | content | content
+
+        - Bulleted
+        - List
+
+        * Bulleted
+        * List
+
+        + Bulleted
+        + List
+
+        + Nested
+          + List
+
+        1. Numbered
+        2. List
+
+        6. Numbered
+        9. List
+
+        * Mixed
+            1. List
+                + Containing
+            2. Different
+        * Types
+
+        `inline code`
+
+            block
+            code
+
+        ```
+        block
+        code
+        ```
+    """.trimIndent(),
+        textStyles = m3TextStyles(),
+        textStyleModifiers = m3TextStyleModifiers(),
+        blockQuoteStyle = m3BlockQuoteStyle(),
+        codeBlockStyle = m3CodeBlockStyle(),
+        modifier = Modifier
+            .verticalScroll(rememberScrollState())
+            .padding(16.dp))
+}

compose-markdown/src/main/kotlin/com/nasdroid/core/markdown/components/MarkdownBlockQuote.kt

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+package com.nasdroid.core.markdown.components
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.padding
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import com.nasdroid.core.markdown.MarkdownNode
+import com.nasdroid.core.markdown.generator.MarkdownBlockQuote
+import com.nasdroid.core.markdown.style.BlockQuoteStyle
+import com.nasdroid.core.markdown.style.CodeBlockStyle
+import com.nasdroid.core.markdown.style.TextStyleModifiers
+import com.nasdroid.core.markdown.style.TextStyles
+import com.nasdroid.core.markdown.toDp
+
+/**
+ * Displays a [MarkdownBlockQuote]. A block quote is a visually distinct section in a document,
+ * usually used to reference external sources.
+ */
+@Composable
+fun MarkdownBlockQuote(
+    blockQuote: MarkdownBlockQuote,
+    style: BlockQuoteStyle,
+    textStyles: TextStyles,
+    textStyleModifiers: TextStyleModifiers,
+    codeBlockStyle: CodeBlockStyle,
+    modifier: Modifier = Modifier,
+) {
+    Box(
+        modifier = Modifier
+            .background(style.background, style.shape)
+            .then(modifier)
+    ) {
+        Column(
+            modifier = Modifier.padding(style.innerPadding),
+            verticalArrangement = Arrangement.spacedBy(textStyles.textStyle.fontSize.toDp())
+        ) {
+            blockQuote.children.forEach {
+                MarkdownNode(
+                    node = it,
+                    textStyles = textStyles,
+                    textStyleModifiers = textStyleModifiers,
+                    blockQuoteStyle = style,
+                    codeBlockStyle = codeBlockStyle
+                )
+            }
+        }
+    }
+}

compose-markdown/src/main/kotlin/com/nasdroid/core/markdown/components/MarkdownCodeBlock.kt

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+package com.nasdroid.core.markdown.components
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.text.BasicText
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.TextStyle
+import com.nasdroid.core.markdown.generator.MarkdownCodeBlock
+import com.nasdroid.core.markdown.style.CodeBlockStyle
+
+/**
+ * Displays a [MarkdownCodeBlock]. A code block is a visually distinct section of text, usually used
+ * to show code.
+ */
+@Composable
+fun MarkdownCodeBlock(
+    codeBlock: MarkdownCodeBlock,
+    style: CodeBlockStyle,
+    textStyle: TextStyle,
+    modifier: Modifier = Modifier,
+) {
+    Box(
+        modifier = Modifier
+            .background(style.background, style.shape)
+            .then(modifier)
+    ) {
+        BasicText(
+            text = codeBlock.code,
+            style = textStyle,
+            modifier = Modifier.padding(style.innerPadding)
+        )
+    }
+}