Add unified diff reader

build.gradle.kts

@@ -28,6 +28,8 @@ kotlin {
     }
 
     js {
+        browser()
+        nodejs()
         compilations.all {
             kotlinOptions {
                 sourceMap = true
@@ -37,18 +39,25 @@ kotlin {
         }
     }
 
-    iosArm64()
-    iosX64()
+//    iosArm64()
+//    iosX64()
 
     sourceSets {
         val commonMain by getting {
             dependencies {
                 implementation("org.jetbrains.kotlin:kotlin-stdlib")
             }
         }
+        val commonTest by getting {
+            dependencies {
+                implementation(kotlin("test-common"))
+                implementation(kotlin("test-annotations-common"))
+            }
+        }
         val jsMain by getting {
             dependencies {
                 implementation("org.jetbrains.kotlin:kotlin-stdlib-js")
+                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-js:${project.property("kotlinx-coroutines.version")}")
             }
         }
         val jvmMain by getting {
@@ -58,8 +67,10 @@ kotlin {
         }
         val jvmTest by getting {
             dependencies {
+                implementation(kotlin("test-junit"))
                 implementation("junit:junit:4.12")
                 implementation("org.assertj:assertj-core:3.11.1")
+                implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:${project.property("kotlinx-coroutines.version")}")
             }
         }
     }

gradle.properties

@@ -1,4 +1,5 @@
 version=4.11.3-kotlin1.5.32
 kotlin_version = 1.5.32
 kotlin.incremental.multiplatform=true
-kotlin.js.compiler=both
+kotlin.js.compiler=both
+kotlinx-coroutines.version=1.5.2

src/commonMain/kotlin/dev/gitlive/difflib/DiffUtils.kt

@@ -23,10 +23,12 @@ import dev.gitlive.difflib.patch.Patch
 import dev.gitlive.difflib.patch.PatchFailedException
 
 internal typealias Predicate<T> = (T) -> Boolean
-internal typealias BiPredicate<T,R> = (T, R) -> Boolean
+internal typealias BiPredicate<T, R> = (T, R) -> Boolean
 internal typealias Consumer<T> = (T) -> Unit
-internal typealias Function<T,R> = (T) -> R
-internal typealias BiFunction<T, T2,R> = (T, T2) -> R
+internal typealias Function<T, R> = (T) -> R
+internal typealias BiFunction<T, T2, R> = (T, T2) -> R
+internal typealias BiConsumer<T, U> = (T, U) -> Unit
+internal typealias LineReader = suspend () -> String?
 
 /**
  * Implements the difference and patching engine

src/commonMain/kotlin/dev/gitlive/difflib/unifieddiff/UnifiedDiff.kt

@@ -36,7 +36,7 @@ class UnifiedDiff {
     }
 
     fun setTailTxt(tailTxt: String?) {
-        tail = tailTxt
+        tail = tailTxt.takeUnless { it.isNullOrEmpty() }
     }
 
 //    @Throws(PatchFailedException::class)

src/commonMain/kotlin/dev/gitlive/difflib/unifieddiff/UnifiedDiffFile.kt

@@ -35,6 +35,8 @@ class UnifiedDiffFile {
     var deletedFileMode: String? = null
     var patch = Patch<String>()
         private set
+    var additions: Int? = null
+    var deletions: Int? = null
     var isNoNewLineAtTheEndOfTheFile = false
     var similarityIndex: Int? = null