1 files changed, 72 insertions, 0 deletions
diff --git a/src/main/kotlin/io/dico/parcels2/util/ext/Misc.kt b/src/main/kotlin/io/dico/parcels2/util/ext/Misc.kt
new file mode 100644
index 0000000..d7feabf
--- /dev/null
+++ b/src/main/kotlin/io/dico/parcels2/util/ext/Misc.kt
@@ -0,0 +1,72 @@
+package io.dico.parcels2.util.ext
+
+import io.dico.parcels2.logger
+import java.io.File
+
+fun File.tryCreate(): Boolean {
+    if (exists()) {
+        return !isDirectory
+    }
+    val parent = parentFile
+    if (parent == null || !(parent.exists() || parent.mkdirs()) || !createNewFile()) {
+        logger.warn("Failed to create file $canonicalPath")
+        return false
+    }
+    return true
+}
+
+inline fun Boolean.alsoIfTrue(block: () -> Unit): Boolean = also { if (it) block() }
+inline fun Boolean.alsoIfFalse(block: () -> Unit): Boolean = also { if (!it) block() }
+
+inline fun <R> Any.synchronized(block: () -> R): R = synchronized(this, block)
+
+inline fun <T> T?.isNullOr(condition: T.() -> Boolean): Boolean = this == null || condition()
+inline fun <T> T?.isPresentAnd(condition: T.() -> Boolean): Boolean = this != null && condition()
+inline fun <T> T?.ifNullRun(block: () -> Unit): T? {
+    if (this == null) block()
+    return this
+}
+
+inline fun <T, U> MutableMap<T, U>.editLoop(block: EditLoopScope<T, U>.(T, U) -> Unit) {
+    return EditLoopScope(this).doEditLoop(block)
+}
+
+inline fun <T, U> MutableMap<T, U>.editLoop(block: EditLoopScope<T, U>.() -> Unit) {
+    return EditLoopScope(this).doEditLoop(block)
+}
+
+class EditLoopScope<T, U>(val _map: MutableMap<T, U>) {
+    private var iterator: MutableIterator<MutableMap.MutableEntry<T, U>>? = null
+    lateinit var _entry: MutableMap.MutableEntry<T, U>
+
+    inline val key get() = _entry.key
+    inline var value
+        get() = _entry.value
+        set(target) = run { _entry.setValue(target) }
+
+    inline fun doEditLoop(block: EditLoopScope<T, U>.() -> Unit) {
+        val it = _initIterator()
+        while (it.hasNext()) {
+            _entry = it.next()
+            block()
+        }
+    }
+
+    inline fun doEditLoop(block: EditLoopScope<T, U>.(T, U) -> Unit) {
+        val it = _initIterator()
+        while (it.hasNext()) {
+            val entry = it.next().also { _entry = it }
+            block(entry.key, entry.value)
+        }
+    }
+
+    fun remove() {
+        iterator!!.remove()
+    }
+
+    fun _initIterator(): MutableIterator<MutableMap.MutableEntry<T, U>> {
+        iterator?.let { throw IllegalStateException() }
+        return _map.entries.iterator().also { iterator = it }
+    }
+
+}