Early support for Markdown and Long Form Text

app/build.gradle

@@ -130,6 +130,11 @@ dependencies {
     implementation 'androidx.camera:camera-lifecycle:1.2.1'
     implementation 'androidx.camera:camera-view:1.2.1'
 
+    // Markdown
+    implementation "com.halilibo.compose-richtext:richtext-ui:0.16.0"
+    implementation "com.halilibo.compose-richtext:richtext-ui-material:0.16.0"
+    implementation "com.halilibo.compose-richtext:richtext-commonmark:0.16.0"
+
     // For QR Scanning
     implementation 'com.google.mlkit:vision-common:17.3.0'
 

app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -12,6 +12,7 @@ import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMuteUserEvent
 import com.vitorpamplona.amethyst.service.model.LnZapEvent
 import com.vitorpamplona.amethyst.service.model.LnZapRequestEvent
+import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.ReactionEvent
 import com.vitorpamplona.amethyst.service.model.ReportEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
@@ -184,7 +185,52 @@ object LocalCache {
     refreshObservers()
   }
 
-  private fun replyToWithoutCitations(event: TextNoteEvent): List<String> {
+  fun consume(event: LongTextNoteEvent, relay: Relay?) {
+    if (antiSpam.isSpam(event)) {
+      relay?.let {
+        it.spamCounter++
+      }
+      return
+    }
+
+    val note = getOrCreateNote(event.id.toHex())
+    val author = getOrCreateUser(event.pubKey.toHexKey())
+
+    if (relay != null) {
+      author.addRelayBeingUsed(relay, event.createdAt)
+      note.addRelay(relay)
+    }
+
+    // Already processed this event.
+    if (note.event != null) return
+
+    val mentions = event.mentions.mapNotNull { checkGetOrCreateUser(it) }
+    val replyTo = replyToWithoutCitations(event).mapNotNull { checkGetOrCreateNote(it) }
+
+    note.loadEvent(event, author, mentions, replyTo)
+
+    //Log.d("TN", "New Note (${notes.size},${users.size}) ${note.author?.toBestDisplayName()} ${note.event?.content?.take(100)} ${formattedDateTime(event.createdAt)}")
+
+    // Prepares user's profile view.
+    author.addNote(note)
+
+    // Adds notifications to users.
+    mentions.forEach {
+      it.addTaggedPost(note)
+    }
+    replyTo.forEach {
+      it.author?.addTaggedPost(note)
+    }
+
+    // Counts the replies
+    replyTo.forEach {
+      it.addReply(note)
+    }
+
+    refreshObservers()
+  }
+
+  private fun findCitations(event: Event): Set<String> {
     var citations = mutableSetOf<String>()
     // Removes citations from replies:
     val matcher = tagSearch.matcher(event.content)
@@ -198,6 +244,17 @@ object LocalCache {
 
       }
     }
+    return citations
+  }
+
+  private fun replyToWithoutCitations(event: TextNoteEvent): List<String> {
+    val citations = findCitations(event)
+
+    return event.replyTos.filter { it !in citations }
+  }
+
+  private fun replyToWithoutCitations(event: LongTextNoteEvent): List<String> {
+    val citations = findCitations(event)
 
     return event.replyTos.filter { it !in citations }
   }

app/src/main/java/com/vitorpamplona/amethyst/service/NostrDataSource.kt

@@ -8,6 +8,7 @@ import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMuteUserEvent
 import com.vitorpamplona.amethyst.service.model.LnZapEvent
 import com.vitorpamplona.amethyst.service.model.LnZapRequestEvent
+import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.ReactionEvent
 import com.vitorpamplona.amethyst.service.model.ReportEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
@@ -90,6 +91,8 @@ abstract class NostrDataSource(val debugName: String) {
               ChannelMessageEvent.kind -> LocalCache.consume(ChannelMessageEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig), relay)
               ChannelHideMessageEvent.kind -> LocalCache.consume(ChannelHideMessageEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
               ChannelMuteUserEvent.kind -> LocalCache.consume(ChannelMuteUserEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
+
+              LongTextNoteEvent.kind -> LocalCache.consume(LongTextNoteEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig), relay)
             }
           }
         } catch (e: Exception) {

app/src/main/java/com/vitorpamplona/amethyst/service/NostrHomeDataSource.kt

@@ -2,6 +2,7 @@ package com.vitorpamplona.amethyst.service
 
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.UserState
+import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.relays.FeedType
 import com.vitorpamplona.amethyst.service.relays.TypedFilter
 import kotlinx.coroutines.Dispatchers
@@ -47,7 +48,7 @@ object NostrHomeDataSource: NostrDataSource("HomeFeed") {
     return TypedFilter(
       types = setOf(FeedType.FOLLOWS),
       filter = JsonFilter(
-        kinds = listOf(TextNoteEvent.kind),
+        kinds = listOf(TextNoteEvent.kind, LongTextNoteEvent.kind),
         authors = followSet,
         limit = 400
       )

app/src/main/java/com/vitorpamplona/amethyst/service/model/LongTextNoteEvent.kt

@@ -0,0 +1,56 @@
+package com.vitorpamplona.amethyst.service.model
+
+import java.util.Date
+import nostr.postr.Utils
+import nostr.postr.events.Event
+
+class LongTextNoteEvent(
+    id: ByteArray,
+    pubKey: ByteArray,
+    createdAt: Long,
+    tags: List<List<String>>,
+    content: String,
+    sig: ByteArray
+): Event(id, pubKey, createdAt, kind, tags, content, sig) {
+    @Transient val replyTos: List<String>
+    @Transient val mentions: List<String>
+
+    @Transient val title: String?
+    @Transient val image: String?
+    @Transient val summary: String?
+    @Transient val publishedAt: Long?
+    @Transient val topics: List<String>
+
+    init {
+        replyTos = tags.filter { it.firstOrNull() == "e" }.mapNotNull { it.getOrNull(1) }
+        mentions = tags.filter { it.firstOrNull() == "p" }.mapNotNull { it.getOrNull(1) }
+
+        topics = tags.filter { it.firstOrNull() == "t" }.mapNotNull { it.getOrNull(1) }
+        title = tags.filter { it.firstOrNull() == "title" }.mapNotNull { it.getOrNull(1) }.firstOrNull()
+        image = tags.filter { it.firstOrNull() == "image" }.mapNotNull { it.getOrNull(1) }.firstOrNull()
+        summary = tags.filter { it.firstOrNull() == "summary" }.mapNotNull { it.getOrNull(1) }.firstOrNull()
+        publishedAt = try {
+            tags.filter { it.firstOrNull() == "published_at" }.mapNotNull { it.getOrNull(1) }.firstOrNull()?.toLong()
+        } catch (_: Exception) {
+            null
+        }
+    }
+
+    companion object {
+        const val kind = 30023
+
+        fun create(msg: String, replyTos: List<String>?, mentions: List<String>?, privateKey: ByteArray, createdAt: Long = Date().time / 1000): LongTextNoteEvent {
+            val pubKey = Utils.pubkeyCreate(privateKey)
+            val tags = mutableListOf<List<String>>()
+            replyTos?.forEach {
+                tags.add(listOf("e", it))
+            }
+            mentions?.forEach {
+                tags.add(listOf("p", it))
+            }
+            val id = generateId(pubKey, createdAt, kind, tags, msg)
+            val sig = Utils.sign(id, privateKey)
+            return LongTextNoteEvent(id, pubKey, createdAt, tags, msg, sig)
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/components/RichTextViewer.kt

@@ -2,24 +2,44 @@ package com.vitorpamplona.amethyst.ui.components
 
 import android.util.Patterns
 import androidx.compose.animation.animateContentSize
+import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.LocalContentColor
 import androidx.compose.material.LocalTextStyle
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Text
+import androidx.compose.material.contentColorFor
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.compositeOver
+import androidx.compose.ui.text.Paragraph
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.text.style.TextDirection
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
 import com.google.accompanist.flowlayout.FlowRow
+import com.halilibo.richtext.markdown.Markdown
+import com.halilibo.richtext.markdown.MarkdownParseOptions
+import com.halilibo.richtext.ui.RichText
+import com.halilibo.richtext.ui.RichTextStyle
+import com.halilibo.richtext.ui.currentRichTextStyle
+import com.halilibo.richtext.ui.material.MaterialRichText
+import com.halilibo.richtext.ui.resolveDefaults
+import com.halilibo.richtext.ui.string.RichTextString
+import com.halilibo.richtext.ui.string.RichTextStringStyle
 import com.vitorpamplona.amethyst.service.lnurl.LnInvoiceUtil
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.service.Nip19
@@ -60,61 +80,82 @@ fun RichTextViewer(
   accountViewModel: AccountViewModel,
   navController: NavController,
 ) {
+
   Column(modifier = modifier.animateContentSize()) {
-    // FlowRow doesn't work well with paragraphs. So we need to split them
-    content.split('\n').forEach { paragraph ->
 
-      FlowRow() {
-        paragraph.split(' ').forEach { word: String ->
+    if (content.startsWith("# ") || content.contains("##") || content.contains("```")) {
+      var richTextStyle by remember { mutableStateOf(RichTextStyle().resolveDefaults()) }
 
-          if (canPreview) {
-            // Explicit URL
-            val lnInvoice = LnInvoiceUtil.findInvoice(word)
-            if (lnInvoice != null) {
-              InvoicePreview(lnInvoice)
-            } else if (isValidURL(word)) {
-              val removedParamsFromUrl = word.split("?")[0].toLowerCase()
-              if (imageExtension.matcher(removedParamsFromUrl).matches()) {
-                ZoomableImageView(word)
-              } else if (videoExtension.matcher(removedParamsFromUrl).matches()) {
-                VideoView(word)
+      MaterialRichText(
+        style = RichTextStyle().resolveDefaults().copy(
+          stringStyle = richTextStyle.stringStyle?.copy(
+            linkStyle = SpanStyle(
+              textDecoration = TextDecoration.Underline,
+              color = MaterialTheme.colors.primary
+            )
+          )
+        ),
+      ) {
+        Markdown(
+          content = content,
+          markdownParseOptions = MarkdownParseOptions.Default,
+        )
+      }
+    } else {
+      // FlowRow doesn't work well with paragraphs. So we need to split them
+      content.split('\n').forEach { paragraph ->
+        FlowRow() {
+          paragraph.split(' ').forEach { word: String ->
+
+            if (canPreview) {
+              // Explicit URL
+              val lnInvoice = LnInvoiceUtil.findInvoice(word)
+              if (lnInvoice != null) {
+                InvoicePreview(lnInvoice)
+              } else if (isValidURL(word)) {
+                val removedParamsFromUrl = word.split("?")[0].toLowerCase()
+                if (imageExtension.matcher(removedParamsFromUrl).matches()) {
+                  ZoomableImageView(word)
+                } else if (videoExtension.matcher(removedParamsFromUrl).matches()) {
+                  VideoView(word)
+                } else {
+                  UrlPreview(word, word)
+                }
+              } else if (Patterns.EMAIL_ADDRESS.matcher(word).matches()) {
+                ClickableEmail(word)
+              } else if (Patterns.PHONE.matcher(word).matches() && word.length > 6) {
+                ClickablePhone(word)
+              } else if (noProtocolUrlValidator.matcher(word).matches()) {
+                UrlPreview("https://$word", word)
+              } else if (tagIndex.matcher(word).matches() && tags != null) {
+                TagLink(word, tags, canPreview, backgroundColor, accountViewModel, navController)
+              } else if (isBechLink(word)) {
+                BechLink(word, navController)
               } else {
-                UrlPreview(word, word)
+                Text(
+                  text = "$word ",
+                  style = LocalTextStyle.current.copy(textDirection = TextDirection.Content),
+                )
               }
-            } else if (Patterns.EMAIL_ADDRESS.matcher(word).matches()) {
-              ClickableEmail(word)
-            } else if (Patterns.PHONE.matcher(word).matches() && word.length > 6) {
-              ClickablePhone(word)
-            } else if (noProtocolUrlValidator.matcher(word).matches()) {
-              UrlPreview("https://$word", word)
-            } else if (tagIndex.matcher(word).matches() && tags != null) {
-              TagLink(word, tags, canPreview, backgroundColor, accountViewModel, navController)
-            } else if (isBechLink(word)) {
-              BechLink(word, navController)
             } else {
-              Text(
-                text = "$word ",
-                style = LocalTextStyle.current.copy(textDirection = TextDirection.Content),
-              )
-            }
-          } else {
-            if (isValidURL(word)) {
-              ClickableUrl("$word ", word)
-            } else if (Patterns.EMAIL_ADDRESS.matcher(word).matches()) {
-              ClickableEmail(word)
-            } else if (Patterns.PHONE.matcher(word).matches() && word.length > 6) {
-              ClickablePhone(word)
-            } else if (noProtocolUrlValidator.matcher(word).matches()) {
-              ClickableUrl(word, "https://$word")
-            } else if (tagIndex.matcher(word).matches() && tags != null) {
-              TagLink(word, tags, canPreview, backgroundColor, accountViewModel, navController)
-            } else if (isBechLink(word)) {
-              BechLink(word, navController)
-            } else {
-              Text(
-                text = "$word ",
-                style = LocalTextStyle.current.copy(textDirection = TextDirection.Content),
-              )
+              if (isValidURL(word)) {
+                ClickableUrl("$word ", word)
+              } else if (Patterns.EMAIL_ADDRESS.matcher(word).matches()) {
+                ClickableEmail(word)
+              } else if (Patterns.PHONE.matcher(word).matches() && word.length > 6) {
+                ClickablePhone(word)
+              } else if (noProtocolUrlValidator.matcher(word).matches()) {
+                ClickableUrl(word, "https://$word")
+              } else if (tagIndex.matcher(word).matches() && tags != null) {
+                TagLink(word, tags, canPreview, backgroundColor, accountViewModel, navController)
+              } else if (isBechLink(word)) {
+                BechLink(word, navController)
+              } else {
+                Text(
+                  text = "$word ",
+                  style = LocalTextStyle.current.copy(textDirection = TextDirection.Content),
+                )
+              }
             }
           }
         }

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/HomeNewThreadFeedFilter.kt

@@ -3,6 +3,7 @@ package com.vitorpamplona.amethyst.ui.dal
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
 import nostr.postr.events.TextNoteEvent
 
@@ -14,7 +15,7 @@ object HomeNewThreadFeedFilter: FeedFilter<Note>() {
 
     return LocalCache.notes.values
       .filter {
-        (it.event is TextNoteEvent || it.event is RepostEvent)
+        (it.event is TextNoteEvent || it.event is RepostEvent || it.event is LongTextNoteEvent)
           && it.author in user.follows
           // && account.isAcceptable(it)  // This filter follows only. No need to check if acceptable
           && it.author?.let { !account.isHidden(it) } ?: true

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -18,6 +18,7 @@ import androidx.compose.ui.graphics.ColorFilter
 import androidx.compose.ui.graphics.ColorMatrix
 import androidx.compose.ui.graphics.compositeOver
 import androidx.compose.ui.graphics.painter.BitmapPainter
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalClipboardManager
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalUriHandler
@@ -25,6 +26,7 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
@@ -36,6 +38,7 @@ import com.vitorpamplona.amethyst.RoboHashCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
+import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.ReactionEvent
 import com.vitorpamplona.amethyst.service.model.ReportEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
@@ -43,6 +46,7 @@ import com.vitorpamplona.amethyst.ui.components.AsyncImageProxy
 import com.vitorpamplona.amethyst.ui.components.ObserveDisplayNip05Status
 import com.vitorpamplona.amethyst.ui.components.ResizeImage
 import com.vitorpamplona.amethyst.ui.components.TranslateableRichTextViewer
+import com.vitorpamplona.amethyst.ui.components.UrlPreviewCard
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.theme.Following
 import kotlin.time.ExperimentalTime
@@ -337,6 +341,58 @@ fun NoteCompose(
                             modifier = Modifier.padding(top = 40.dp),
                             thickness = 0.25.dp
                         )
+                    } else if (noteEvent is LongTextNoteEvent) {
+                        Row(
+                            modifier = Modifier
+                                .clip(shape = RoundedCornerShape(15.dp))
+                                .border(1.dp, MaterialTheme.colors.onSurface.copy(alpha = 0.12f), RoundedCornerShape(15.dp))
+                        ) {
+                            Column {
+                                noteEvent.image?.let {
+                                    AsyncImage(
+                                        model = noteEvent.image,
+                                        contentDescription = stringResource(
+                                            R.string.preview_card_image_for,
+                                            noteEvent.image
+                                        ),
+                                        contentScale = ContentScale.FillWidth,
+                                        modifier = Modifier.fillMaxWidth()
+                                    )
+                                }
+
+                                noteEvent.title?.let {
+                                    Text(
+                                        text = it,
+                                        style = MaterialTheme.typography.body2,
+                                        modifier = Modifier
+                                            .fillMaxWidth()
+                                            .padding(start = 10.dp, end = 10.dp, top = 10.dp),
+                                        maxLines = 1,
+                                        overflow = TextOverflow.Ellipsis
+                                    )
+                                }
+
+                                noteEvent.summary?.let {
+                                    Text(
+                                        text = it,
+                                        style = MaterialTheme.typography.caption,
+                                        modifier = Modifier
+                                            .fillMaxWidth()
+                                            .padding(start = 10.dp, end = 10.dp, bottom = 10.dp),
+                                        color = Color.Gray,
+                                        maxLines = 3,
+                                        overflow = TextOverflow.Ellipsis
+                                    )
+                                }
+                            }
+                        }
+
+                        ReactionsRow(note, accountViewModel)
+
+                        Divider(
+                            modifier = Modifier.padding(top = 10.dp),
+                            thickness = 0.25.dp
+                        )
                     } else {
                         val eventContent = accountViewModel.decrypt(note)
 

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/ThreadFeedView.kt

@@ -33,6 +33,7 @@ import androidx.compose.ui.draw.drawBehind
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.compositeOver
+import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
 import com.google.accompanist.swiperefresh.SwipeRefresh
@@ -51,6 +52,13 @@ import com.vitorpamplona.amethyst.ui.note.timeAgo
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import kotlinx.coroutines.delay
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.sp
+import coil.compose.AsyncImage
+import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 
 @Composable
 fun ThreadFeedView(noteId: String, viewModel: FeedViewModel, accountViewModel: AccountViewModel, navController: NavController) {
@@ -259,6 +267,41 @@ fun NoteMaster(baseNote: Note,
                 }
             }
 
+            if (noteEvent is LongTextNoteEvent) {
+                Row(modifier = Modifier.padding(horizontal = 12.dp)) {
+                    Column {
+                        noteEvent.image?.let {
+                            AsyncImage(
+                                model = noteEvent.image,
+                                contentDescription = stringResource(
+                                    R.string.preview_card_image_for,
+                                    noteEvent.image
+                                ),
+                                contentScale = ContentScale.FillWidth,
+                                modifier = Modifier.fillMaxWidth()
+                            )
+                        }
+
+                        noteEvent.title?.let {
+                            Text(
+                                text = it,
+                                fontSize = 30.sp,
+                                fontWeight = FontWeight.Bold,
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .padding(top = 10.dp)
+                            )
+                        }
+
+                        noteEvent.summary?.let {
+                            Text(
+                                text = it
+                            )
+                        }
+                    }
+                }
+            }
+
             Row(modifier = Modifier.padding(horizontal = 12.dp)) {
                 Column() {
                     val eventContent = note.event?.content