Create the logic in Plugins, which will manage redirectTo for Process…

…Builder (#220)

* Create the logic in Plugins, which will manage redirectTo for ProcessBuilder

What's done:
* Added logic for redirectTo
Closes #122

save-common-test/src/commonNonJsMain/kotlin/org/cqfn/save/plugin/MockPlugin.kt

@@ -17,7 +17,8 @@ class MockPlugin(baseDir: Path, testFiles: List<String> = emptyList()) : Plugin(
     TestConfig((baseDir / "save.toml").also { fs.createFile(it) }, null, fs = fs),
     testFiles,
     fs,
-    useInternalRedirections = true
+    useInternalRedirections = true,
+    redirectTo = null
 ) {
     override fun handleFiles(files: Sequence<List<Path>>): Sequence<TestResult> = emptySequence()
 

save-common/src/commonMain/kotlin/org/cqfn/save/core/plugin/Plugin.kt

@@ -17,12 +17,14 @@ import okio.Path
  * @property testFiles a list of files (test resources or save.toml configs)
  * @property fs describes the current file system
  * @property useInternalRedirections whether to redirect stdout/stderr for internal purposes
+ * @property redirectTo a file where process output and errors should be redirected. If null, output will be returned as [ExecutionResult.stdout] and [ExecutionResult.stderr].
  */
 abstract class Plugin(
     open val testConfig: TestConfig,
     protected val testFiles: List<String>,
     protected val fs: FileSystem,
-    private val useInternalRedirections: Boolean) {
+    private val useInternalRedirections: Boolean,
+    protected val redirectTo: Path?) {
     /**
      * Instance that is capable of executing processes
      */

save-common/src/commonMain/kotlin/org/cqfn/save/core/utils/ProcessBuilder.kt

@@ -52,7 +52,7 @@ class ProcessBuilder(private val useInternalRedirections: Boolean, private val f
      * Execute [command] and wait for its completion.
      *
      * @param command executable command with arguments
-     * @param redirectTo a file where process output should be redirected. If null, output will be returned as [ExecutionResult.stdout].
+     * @param redirectTo a file where process output and errors should be redirected. If null, output will be returned as [ExecutionResult.stdout] and [ExecutionResult.stderr].
      * @return [ExecutionResult] built from process output
      * @throws ProcessExecutionException in case of impossibility of command execution
      */
@@ -107,6 +107,7 @@ class ProcessBuilder(private val useInternalRedirections: Boolean, private val f
         redirectTo?.let {
             fs.write(redirectTo) {
                 write(stdout.joinToString("\n").encodeToByteArray())
+                write(stderr.joinToString("\n").encodeToByteArray())
             }
         } ?: logDebug("Execution output:\n$stdout")
         return ExecutionResult(status, stdout, stderr)

save-plugins/fix-and-warn-plugin/src/commonMain/kotlin/org/cqfn/save/plugins/fixandwarn/FixAndWarnPlugin.kt

@@ -26,11 +26,14 @@ class FixAndWarnPlugin(
     testConfig: TestConfig,
     testFiles: List<String>,
     fileSystem: FileSystem,
-    useInternalRedirections: Boolean = true) : Plugin(
+    useInternalRedirections: Boolean = true,
+    redirectTo: Path? = null,
+) : Plugin(
     testConfig,
     testFiles,
     fileSystem,
-    useInternalRedirections) {
+    useInternalRedirections,
+    redirectTo) {
     private val fixPluginConfig: FixPluginConfig =
             testConfig.pluginConfigs.filterIsInstance<FixAndWarnPluginConfig>().single().fix
     private val warnPluginConfig: WarnPluginConfig =

save-plugins/fix-plugin/src/commonMain/kotlin/org/cqfn/save/plugins/fix/FixPlugin.kt

@@ -29,12 +29,14 @@ class FixPlugin(
     testConfig: TestConfig,
     testFiles: List<String>,
     fileSystem: FileSystem,
-    useInternalRedirections: Boolean = true
+    useInternalRedirections: Boolean = true,
+    redirectTo: Path? = null,
 ) : Plugin(
     testConfig,
     testFiles,
     fileSystem,
-    useInternalRedirections) {
+    useInternalRedirections,
+    redirectTo) {
     private val diffGenerator = DiffRowGenerator.create()
         .showInlineDiffs(true)
         .mergeOriginalRevised(false)
@@ -58,7 +60,7 @@ class FixPlugin(
 
             val execCmd = "${(generalConfig.execCmd)} ${fixPluginConfig.execFlags} $testCopyNames"
             val executionResult = try {
-                pb.exec(execCmd, null)
+                pb.exec(execCmd, redirectTo)
             } catch (ex: ProcessExecutionException) {
                 return@map chunk.map {
                     TestResult(

save-plugins/warn-plugin/src/commonMain/kotlin/org/cqfn/save/plugin/warn/WarnPlugin.kt

@@ -29,12 +29,14 @@ class WarnPlugin(
     testConfig: TestConfig,
     testFiles: List<String>,
     fileSystem: FileSystem,
-    useInternalRedirections: Boolean = true
+    useInternalRedirections: Boolean = true,
+    redirectTo: Path? = null,
 ) : Plugin(
     testConfig,
     testFiles,
     fileSystem,
-    useInternalRedirections) {
+    useInternalRedirections,
+    redirectTo) {
     private val expectedAndNotReceived = "Some warnings were expected but not received"
     private val unexpected = "Some warnings were unexpected"
 
@@ -118,7 +120,7 @@ class WarnPlugin(
         val execCmd = "${generalConfig.execCmd} ${warnPluginConfig.execFlags} $fileNamesForExecCmd"
 
         val executionResult = try {
-            pb.exec("cd ${testConfig.getRootConfig().location.parent} && $execCmd", null)
+            pb.exec("cd ${testConfig.getRootConfig().location.parent} && $execCmd", redirectTo)
         } catch (ex: ProcessExecutionException) {
             return sequenceOf(
                 TestResult(