Add command line entry points

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/cmdline/KSPCommonMain.kt

@@ -0,0 +1,17 @@
+package com.google.devtools.ksp.cmdline
+
+import com.google.devtools.ksp.processing.kspCommonArgParser
+import com.google.devtools.ksp.processing.kspCommonArgParserHelp
+
+class KSPCommonMain {
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            if ("-h" in args || "--help" in args) {
+                printHelpMsg(kspCommonArgParserHelp())
+            } else {
+                runWithArgs(args, ::kspCommonArgParser)
+            }
+        }
+    }
+}

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/cmdline/KSPJsMain.kt

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+package com.google.devtools.ksp.cmdline
+
+import com.google.devtools.ksp.processing.kspJsArgParser
+import com.google.devtools.ksp.processing.kspJsArgParserHelp
+
+class KSPJsMain {
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            if ("-h" in args || "--help" in args) {
+                printHelpMsg(kspJsArgParserHelp())
+            } else {
+                runWithArgs(args, ::kspJsArgParser)
+            }
+        }
+    }
+}

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/cmdline/KSPJvmMain.kt

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+package com.google.devtools.ksp.cmdline
+
+import com.google.devtools.ksp.impl.KotlinSymbolProcessing
+import com.google.devtools.ksp.processing.KSPConfig
+import com.google.devtools.ksp.processing.KspGradleLogger
+import com.google.devtools.ksp.processing.SymbolProcessorProvider
+import com.google.devtools.ksp.processing.kspJvmArgParser
+import com.google.devtools.ksp.processing.kspJvmArgParserHelp
+import java.io.File
+import java.net.URLClassLoader
+import java.util.ServiceLoader
+
+class KSPJvmMain {
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            if ("-h" in args || "--help" in args) {
+                printHelpMsg(kspJvmArgParserHelp())
+            } else {
+                runWithArgs(args, ::kspJvmArgParser)
+            }
+        }
+    }
+}
+
+internal fun printHelpMsg(optionsList: String) {
+    println("Available options:")
+    println(optionsList)
+    println("where:")
+    println(" * is required")
+    println(" List is colon separated. E.g., arg1:arg2:arg3")
+    println(" Map is in the form key1=value1:key2=value2")
+}
+
+internal fun runWithArgs(args: Array<String>, parse: (Array<String>) -> Pair<KSPConfig, List<String>>) {
+    val logger = KspGradleLogger(KspGradleLogger.LOGGING_LEVEL_WARN)
+    val (config, classpath) = parse(args)
+    val processorClassloader = URLClassLoader(classpath.map { File(it).toURI().toURL() }.toTypedArray())
+
+    val processorProviders = ServiceLoader.load(
+        processorClassloader.loadClass("com.google.devtools.ksp.processing.SymbolProcessorProvider"),
+        processorClassloader
+    ).toList() as List<SymbolProcessorProvider>
+
+    KotlinSymbolProcessing(config, processorProviders, logger).execute()
+}

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/cmdline/KSPNativeMain.kt

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+package com.google.devtools.ksp.cmdline
+
+import com.google.devtools.ksp.processing.kspNativeArgParser
+import com.google.devtools.ksp.processing.kspNativeArgParserHelp
+
+class KSPNativeMain {
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            if ("-h" in args || "--help" in args) {
+                printHelpMsg(kspNativeArgParserHelp())
+            } else {
+                runWithArgs(args, ::kspNativeArgParser)
+            }
+        }
+    }
+}