Add syntax highlight to sample app

app/build.gradle

@@ -30,6 +30,7 @@ dependencies {
 
     implementation project(':library')
     implementation project(':library-image-loader')
+    implementation project(':library-syntax')
 
     implementation 'ru.noties:debug:3.0.0@jar'
     implementation 'me.saket:better-link-movement-method:2.2.0'
@@ -38,4 +39,7 @@ dependencies {
 
     implementation 'com.google.dagger:dagger:2.10'
     annotationProcessor 'com.google.dagger:dagger-compiler:2.10'
+
+    implementation PRISM_4J
+    annotationProcessor PRISM_4J_BUNDLER
 }

app/src/main/java/ru/noties/markwon/AppModule.java

@@ -16,8 +16,14 @@ import okhttp3.Cache;
 import okhttp3.OkHttpClient;
 import ru.noties.markwon.il.AsyncDrawableLoader;
 import ru.noties.markwon.spans.AsyncDrawable;
+import ru.noties.markwon.syntax.Prism4jTheme;
+import ru.noties.markwon.syntax.Prism4jThemeDefault;
+import ru.noties.prism4j.Prism4j;
+import ru.noties.prism4j.annotations.PrismBundle;
 
 @Module
+@PrismBundle(include = {"c", "clojure", "cpp", "csharp", "css", "dart", "git", "go", "java",
+        "javascript", "json", "kotlin", "latex", "makefile", "markup", "python", "sql", "yaml"})
 class AppModule {
 
     private final App app;
@@ -75,4 +81,16 @@ class AppModule {
                 .resources(resources)
                 .build();
     }
+
+    @Provides
+    @Singleton
+    Prism4j prism4j() {
+        return new Prism4j(new GrammarLocatorDef());
+    }
+
+    @Singleton
+    @Provides
+    Prism4jTheme prism4jTheme() {
+        return Prism4jThemeDefault.create();
+    }
 }

app/src/main/java/ru/noties/markwon/MarkdownRenderer.java

@@ -14,6 +14,10 @@ import javax.inject.Inject;
 
 import ru.noties.debug.Debug;
 import ru.noties.markwon.spans.AsyncDrawable;
+import ru.noties.markwon.spans.SpannableTheme;
+import ru.noties.markwon.syntax.Prism4jSyntaxHighlight;
+import ru.noties.markwon.syntax.Prism4jTheme;
+import ru.noties.prism4j.Prism4j;
 
 @ActivityScope
 public class MarkdownRenderer {
@@ -31,6 +35,12 @@ public class MarkdownRenderer {
     @Inject
     Handler handler;
 
+    @Inject
+    Prism4j prism4j;
+
+    @Inject
+    Prism4jTheme prism4jTheme;
+
     private Future<?> task;
 
     @Inject
@@ -42,7 +52,11 @@ public class MarkdownRenderer {
             @Nullable final Uri uri,
             @NonNull final String markdown,
             @NonNull final MarkdownReadyListener listener) {
+
+        // todo: create prism4j theme factory (accepting light/dark argument)
+
         cancel();
+
         task = service.submit(new Runnable() {
             @Override
             public void run() {
@@ -57,6 +71,10 @@ public class MarkdownRenderer {
                 final SpannableConfiguration configuration = SpannableConfiguration.builder(context)
                         .asyncDrawableLoader(loader)
                         .urlProcessor(urlProcessor)
+                        .syntaxHighlight(Prism4jSyntaxHighlight.create(prism4j, prism4jTheme))
+                        .theme(SpannableTheme.builderWithDefaults(context)
+                                .codeBackgroundColor(prism4jTheme.background())
+                                .build())
                         .build();
 
                 final long start = SystemClock.uptimeMillis();

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jSyntaxHighlight.java

@@ -14,7 +14,7 @@ public class Prism4jSyntaxHighlight implements SyntaxHighlight {
     public static Prism4jSyntaxHighlight create(
             @NonNull Prism4j prism4j,
             @NonNull Prism4jTheme theme) {
-        return null;
+        return new Prism4jSyntaxHighlight(prism4j, theme, null);
     }
 
     @NonNull
@@ -22,7 +22,7 @@ public class Prism4jSyntaxHighlight implements SyntaxHighlight {
             @NonNull Prism4j prism4j,
             @NonNull Prism4jTheme theme,
             @Nullable String fallback) {
-        return null;
+        return new Prism4jSyntaxHighlight(prism4j, theme, fallback);
     }
 
     private final Prism4j prism4j;

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jTheme.java

@@ -1,5 +1,6 @@
 package ru.noties.markwon.syntax;
 
+import android.support.annotation.ColorInt;
 import android.support.annotation.NonNull;
 
 import ru.noties.markwon.SpannableBuilder;
@@ -7,6 +8,9 @@ import ru.noties.prism4j.Prism4j;
 
 public interface Prism4jTheme {
 
+    @ColorInt
+    int background();
+
     void apply(
             @NonNull String language,
             @NonNull Prism4j.Syntax syntax,

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jThemeBase.java

@@ -64,7 +64,6 @@ public abstract class Prism4jThemeBase implements Prism4jTheme {
 
         final int color = color(language, type, alias);
         if (color != 0) {
-            builder.setSpan(new ForegroundColorSpan(color), start, end);
             applyColor(language, type, alias, color, builder, start, end);
         }
     }

library-syntax/src/main/java/ru/noties/markwon/syntax/Prism4jThemeDefault.java

@@ -61,4 +61,9 @@ public class Prism4jThemeDefault extends Prism4jThemeBase {
             builder.setSpan(new EmphasisSpan(), start, end);
         }
     }
+
+    @Override
+    public int background() {
+        return 0xFFf5f2f0;
+    }
 }