Add build tool fallbacks for tasks (#213)

This adds `mvn` and `gradle` fallbacks for projects where no Maven
Wrapper or Gradle Wrapper is present.

The message when no build tooling is found is updated
from "No build system found" to "No build tool found".

Add support for Kotlin DSL (build.gradle.kts) based projects.

Author: mweirauch

languages/java/tasks.json

@@ -1,7 +1,7 @@
 [
   {
     "label": "Run $ZED_CUSTOM_java_class_name",
-    "command": "pkg=\"${ZED_CUSTOM_java_package_name:}\"; cls=\"$ZED_CUSTOM_java_class_name\"; if [ -n \"$pkg\" ]; then c=\"$pkg.$cls\"; else c=\"$cls\"; fi; if [ -f pom.xml ]; then ./mvnw clean compile exec:java -Dexec.mainClass=\"$c\"; elif [ -f gradlew ]; then ./gradlew run -PmainClass=\"$c\"; else find . -name '*.java' -not -path './bin/*' -not -path './target/*' -not -path './build/*' -print0 | xargs -0 javac -d bin && java -cp bin \"$c\"; fi;",
+    "command": "pkg=\"${ZED_CUSTOM_java_package_name:}\"; cls=\"$ZED_CUSTOM_java_class_name\"; if [ -n \"$pkg\" ]; then c=\"$pkg.$cls\"; else c=\"$cls\"; fi; if [ -f pom.xml ]; then [ -f ./mvnw ] && CMD=\"./mvnw\" || CMD=\"mvn\"; $CMD clean compile exec:java -Dexec.mainClass=\"$c\"; elif [ -f build.gradle ] || [ -f build.gradle.kts ]; then [ -f ./gradlew ] && CMD=\"./gradlew\" || CMD=\"gradle\"; $CMD run -PmainClass=\"$c\"; else find . -name '*.java' -not -path './bin/*' -not -path './target/*' -not -path './build/*' -print0 | xargs -0 javac -d bin && java -cp bin \"$c\"; fi;",
     "use_new_terminal": false,
     "reveal": "always",
     "tags": ["java-main"],
@@ -14,7 +14,7 @@
   },
   {
     "label": "$ZED_CUSTOM_java_class_name.${ZED_CUSTOM_java_outer_class_name:}.$ZED_CUSTOM_java_method_name",
-    "command": "package=\"$ZED_CUSTOM_java_package_name\"; outer=\"${ZED_CUSTOM_java_outer_class_name:}\"; inner=\"$ZED_CUSTOM_java_class_name\"; method=\"$ZED_CUSTOM_java_method_name\"; sep=\"$\"; if [ -n \"$outer\" ]; then c=\"$outer$sep$inner\"; else c=\"$inner\"; fi; if [ -f pom.xml ]; then ./mvnw clean test -Dtest=\"$package.$c#$method\"; elif [ -f gradlew ]; then ./gradlew test --tests \"$package.$c.$method\"; else >&2 echo 'No build system found'; exit 1; fi;",
+    "command": "package=\"$ZED_CUSTOM_java_package_name\"; outer=\"${ZED_CUSTOM_java_outer_class_name:}\"; inner=\"$ZED_CUSTOM_java_class_name\"; method=\"$ZED_CUSTOM_java_method_name\"; sep=\"$\"; if [ -n \"$outer\" ]; then c=\"$outer$sep$inner\"; else c=\"$inner\"; fi; if [ -f pom.xml ]; then [ -f ./mvnw ] && CMD=\"./mvnw\" || CMD=\"mvn\"; $CMD clean test -Dtest=\"$package.$c#$method\"; elif [ -f build.gradle ] || [ -f build.gradle.kts ]; then [ -f ./gradlew ] && CMD=\"./gradlew\" || CMD=\"gradle\"; $CMD test --tests \"$package.$c.$method\"; else >&2 echo 'No build tool found'; exit 1; fi;",
     "use_new_terminal": false,
     "reveal": "always",
     "tags": ["java-test-method", "java-test-method-nested"],
@@ -27,7 +27,7 @@
   },
   {
     "label": "Test class $ZED_CUSTOM_java_class_name",
-    "command": "package=\"$ZED_CUSTOM_java_package_name\"; outer=\"${ZED_CUSTOM_java_outer_class_name:}\"; inner=\"$ZED_CUSTOM_java_class_name\"; sep=\"$\"; if [ -n \"$outer\" ]; then c=\"$outer$sep$inner\"; else c=\"$inner\"; fi; if [ -f pom.xml ]; then ./mvnw clean test -Dtest=\"$package.$c\"; elif [ -f gradlew ]; then ./gradlew test --tests \"$package.$c\"; else >&2 echo 'No build system found'; exit 1; fi;",
+    "command": "package=\"$ZED_CUSTOM_java_package_name\"; outer=\"${ZED_CUSTOM_java_outer_class_name:}\"; inner=\"$ZED_CUSTOM_java_class_name\"; sep=\"$\"; if [ -n \"$outer\" ]; then c=\"$outer$sep$inner\"; else c=\"$inner\"; fi; if [ -f pom.xml ]; then [ -f ./mvnw ] && CMD=\"./mvnw\" || CMD=\"mvn\"; $CMD clean test -Dtest=\"$package.$c\"; elif [ -f build.gradle ] || [ -f build.gradle.kts ]; then [ -f ./gradlew ] && CMD=\"./gradlew\" || CMD=\"gradle\"; $CMD test --tests \"$package.$c\"; else >&2 echo 'No build tool found'; exit 1; fi;",
     "use_new_terminal": false,
     "reveal": "always",
     "tags": ["java-test-class", "java-test-class-nested"],
@@ -40,7 +40,7 @@
   },
   {
     "label": "Run tests",
-    "command": "if [ -f pom.xml ]; then ./mvnw clean test; elif [ -f gradlew ]; then ./gradlew test; else >&2 echo 'No build system found'; exit 1; fi;",
+    "command": "if [ -f pom.xml ]; then [ -f ./mvnw ] && CMD=\"./mvnw\" || CMD=\"mvn\"; $CMD clean test; elif [ -f build.gradle ] || [ -f build.gradle.kts ]; then [ -f ./gradlew ] && CMD=\"./gradlew\" || CMD=\"gradle\"; $CMD test; else >&2 echo 'No build tool found'; exit 1; fi;",
     "use_new_terminal": false,
     "reveal": "always",
     "shell": {