Adding a small workaround in logging: --quiet option and small bug fixes (#276)

### What's done:
- option --quiet will supress all warnings that are produced by save, only info would be availiable
- removing assertion that covered the case with multiple extraFlags in test resource
- filtering out directories from test resources

Author: orchestr7

OptionsTable.md

@@ -6,7 +6,7 @@ Most (except for `-h` and `-prop`) of the options below can be passed to a SAVE
 | parallel | parallel-mode | Whether to enable parallel mode | false |
 | t | threads | Number of threads | 1 |
 | d | debug | Turn on debug logging | false |
-| q | quiet | Do not log anything | false |
+| q | quiet | Log only test results (if `--result-output` is `stdout`) without any warnings (only with critical errors) | false |
 | - | report-type | Type of generated report with execution results | PLAIN |
 | b | baseline | Path to the file with baseline data | - |
 | e | exclude-suites | Test suites, which won't be checked | - |

buildSrc/src/main/resources/config-options.json

@@ -28,7 +28,7 @@
       "kotlinType": "kotlin.Boolean",
       "fullName" : "quiet",
       "shortName" : "q",
-      "description" : "Do not log anything",
+      "description" : "Log only test results (if `--result-output` is `stdout`) without any warnings (only with critical errors)",
       "default" : "false"
     },
     "reportType" : {

examples/kotlin-diktat/warn/chapter1/MyTest/MyTest/MyTest.kt/EmptyFile.kt

@@ -7,6 +7,7 @@ package org.cqfn.save.cli
 import org.cqfn.save.cli.logging.logErrorAndExit
 import org.cqfn.save.core.config.SaveProperties
 import org.cqfn.save.core.logging.isDebugEnabled
+import org.cqfn.save.core.logging.isQuietMode
 import org.cqfn.save.core.logging.logDebug
 
 import okio.FileNotFoundException
@@ -132,6 +133,7 @@ fun readPropertiesFile(propertiesFileName: String?): SaveProperties {
 
 private fun tryToUpdateDebugLevel(properties: SaveProperties) {
     isDebugEnabled = properties.debug ?: false
+    isQuietMode = properties.quiet ?: false
 }
 
 private fun errorAndExitNotFoundDir() {

save-cli/src/nativeMain/kotlin/org/cqfn/save/cli/SaveConfigReader.kt

@@ -12,6 +12,11 @@ import kotlinx.datetime.Clock
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toLocalDateTime
 
+/**
+ * Is debug logging enabled
+ */
+var isQuietMode: Boolean = false
+
 /**
  * Is debug logging enabled
  */
@@ -66,7 +71,11 @@ fun logInfo(msg: String): Unit = logMessage("INFO", msg)
  *
  * @param msg a message string
  */
-fun logWarn(msg: String): Unit = logMessage("WARN", msg, OutputStreamType.STDERR)
+fun logWarn(msg: String): Unit {
+    if (!isQuietMode) {
+        logMessage("WARN", msg, OutputStreamType.STDERR)
+    }
+}
 
 /**
  * Log a message with error level

save-common/src/commonMain/kotlin/org/cqfn/save/core/logging/Logger.kt

@@ -84,9 +84,8 @@ abstract class Plugin(
 
         val rawTestFiles = rawDiscoverTestFiles(root.resourceDirectories())
             // removing excluded test resources
-            .filterNot {
-                isExcludedTest(it, excludedTests)
-            }
+            .filterNot { isExcludedTest(it, excludedTests) }
+            .filterNot { fs.metadata(it.test).isDirectory }
 
         return if (testFiles.isNotEmpty()) {
             val foundTests = rawTestFiles.filter { rawTestFile ->

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

@@ -41,6 +41,17 @@ class ClassicWarnTest {
                 ), 3
             )
 
+    @Test
+    @Ignore
+    // FixMe: this test should be investigated, as resource discovery looks to be buggy
+    // org.opentest4j.AssertionFailedError: expected: <3> but was: <8>
+    fun `executing warn plugin on parental directory`() =
+            runTestsWithDiktat(
+                listOf(
+                    "warn"
+                ), 3
+            )
+
     @Test
     fun `executing warn plugin on save-toml file in directory`() =
             runTestsWithDiktat(