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feat: detect Lemmy specific links (#102)

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Diego Beraldin 2023-11-04 09:23:08 +01:00 committed by GitHub
parent 28bce8c7b7
commit a4a8722b02
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2 changed files with 77 additions and 0 deletions
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75
core-md/src/androidMain/kotlin/com/github/diegoberaldin/raccoonforlemmy/core/markdown/plugins/MarkwonLemmyPlugin.kt Normal file
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@ -0,0 +1,75 @@
package com.github.diegoberaldin.raccoonforlemmy.core.markdown.plugins
import android.text.Spannable
import android.text.SpannableStringBuilder
import android.text.style.URLSpan
import android.text.util.Linkify
import io.noties.markwon.AbstractMarkwonPlugin
import io.noties.markwon.MarkwonPlugin
import io.noties.markwon.MarkwonVisitor
import io.noties.markwon.SpannableBuilder
import io.noties.markwon.core.CorePlugin
import io.noties.markwon.core.CoreProps
import org.commonmark.node.Link
import java.util.regex.Pattern
private const val COMMUNITY_FRAGMENT: String = """[a-zA-Z0-9_]{3,}"""
private const val INSTANCE_FRAGMENT: String =
"""([a-zA-Z0-9][a-zA-Z0-9-]{0,61}[a-zA-Z0-9]\.)+[a-zA-Z]{2,}"""
private const val USER_FRAGMENT: String = """[a-zA-Z0-9_]{3,}"""
private val lemmyCommunityPattern: Pattern =
Pattern.compile("(?<!\\S)!($COMMUNITY_FRAGMENT)(?:@($INSTANCE_FRAGMENT))?\\b")
private val lemmyUserPattern: Pattern =
Pattern.compile("(?<!\\S)@($USER_FRAGMENT)(?:@($INSTANCE_FRAGMENT))?\\b")
class MarkwonLemmyLinkPlugin private constructor() : AbstractMarkwonPlugin() {
companion object {
fun create() = MarkwonLemmyLinkPlugin()
}
override fun configure(registry: MarkwonPlugin.Registry) {
registry.require(CorePlugin::class.java) { it.addOnTextAddedListener(LemmyTextAddedListener()) }
}
private class LemmyTextAddedListener : CorePlugin.OnTextAddedListener {
override fun onTextAdded(visitor: MarkwonVisitor, text: String, start: Int) {
val spanFactory = visitor.configuration().spansFactory().get(
Link::class.java,
) ?: return
val builder = SpannableStringBuilder(text)
if (addLinks(builder)) {
// target URL span specifically
val spans = builder.getSpans(0, builder.length, URLSpan::class.java)
if (!spans.isNullOrEmpty()) {
val renderProps = visitor.renderProps()
val spannableBuilder = visitor.builder()
for (span in spans) {
CoreProps.LINK_DESTINATION[renderProps] = span.url
SpannableBuilder.setSpans(
spannableBuilder,
spanFactory.getSpans(visitor.configuration(), renderProps),
start + builder.getSpanStart(span),
start + builder.getSpanEnd(span),
)
}
}
}
}
fun addLinks(text: Spannable): Boolean {
val communityLinkAdded = Linkify.addLinks(text, lemmyCommunityPattern, null)
val userLinkAdded = Linkify.addLinks(text, lemmyUserPattern, null)
return communityLinkAdded || userLinkAdded
}
}
}

2
core-md/src/androidMain/kotlin/com/github/diegoberaldin/raccoonforlemmy/core/markdown/provider/DefaultMarkwonProvider.kt
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@ -3,6 +3,7 @@ package com.github.diegoberaldin.raccoonforlemmy.core.markdown.provider
import android.content.Context
import android.text.util.Linkify
import com.github.diegoberaldin.raccoonforlemmy.core.markdown.plugins.ClickableImagesPlugin
import com.github.diegoberaldin.raccoonforlemmy.core.markdown.plugins.MarkwonLemmyLinkPlugin
import com.github.diegoberaldin.raccoonforlemmy.core.markdown.plugins.MarkwonSpoilerPlugin
import io.noties.markwon.AbstractMarkwonPlugin
import io.noties.markwon.Markwon
@ -23,6 +24,7 @@ class DefaultMarkwonProvider(
init {
markwon = Markwon.builder(context)
.usePlugin(LinkifyPlugin.create(Linkify.WEB_URLS))
.usePlugin(MarkwonLemmyLinkPlugin.create())
.usePlugin(StrikethroughPlugin.create())
.usePlugin(TablePlugin.create(context))
.usePlugin(HtmlPlugin.create())