refactor: adds an internal `depsFrege` task and simplifes `replFrege`

- `depsFregeTask`: only internal use for the vscode plugin to automate the
repl code lens.
- `replFregeTask`: simplified to only print the command to start the repl because
starting and interacting through a console is not gradle's core strength. See
https://github.com/tricktron/frege-gradle-plugin/issues/11.

3 files changed, 47 insertions, 27 deletions

diff --git a/src/main/java/ch/fhnw/thga/gradleplugins/FregePlugin.java b/src/main/java/ch/fhnw/thga/gradleplugins/FregePlugin.java
index b4948e6..18016f3 100644
--- a/src/main/java/ch/fhnw/thga/gradleplugins/FregePlugin.java
+++ b/src/main/java/ch/fhnw/thga/gradleplugins/FregePlugin.java
@@ -3,17 +3,32 @@ package ch.fhnw.thga.gradleplugins;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
 import org.gradle.api.artifacts.Configuration;
+import org.gradle.api.file.FileCollection;
+import org.gradle.api.file.RegularFile;
+import org.gradle.api.provider.Provider;
 import org.gradle.api.tasks.TaskProvider;
 
+import ch.fhnw.thga.gradleplugins.internal.DependencyFregeTask;
+
 public class FregePlugin implements Plugin<Project> {
     public static final String SETUP_FREGE_TASK_NAME = "setupFrege";
     public static final String COMPILE_FREGE_TASK_NAME = "compileFrege";
     public static final String RUN_FREGE_TASK_NAME = "runFrege";
     public static final String REPL_FREGE_TASK_NAME = "replFrege";
+    public static final String DEPS_FREGE_TASK_NAME = "depsFrege";
     public static final String FREGE_PLUGIN_ID = "ch.fhnw.thga.frege";
     public static final String FREGE_EXTENSION_NAME = "frege";
     public static final String FREGE_IMPLEMENTATION_SCOPE = "implementation";
 
+    private FileCollection setupClasspath(Project project, Configuration dependencies,
+            Provider<RegularFile> fregeCompilerJar) {
+        if (dependencies.isEmpty()) {
+            return project.files(fregeCompilerJar);
+        } else {
+            return project.files(fregeCompilerJar, dependencies.getAsPath());
+        }
+    }
+
     @Override
     public void apply(Project project) {
         Configuration implementation = project.getConfigurations().create(FREGE_IMPLEMENTATION_SCOPE);
@@ -41,10 +56,16 @@ public class FregePlugin implements Plugin<Project> {
             task.getMainModule().set(extension.getMainModule());
             task.getFregeDependencies().set(implementation.getAsPath());
         });
+        project.getTasks().register(DEPS_FREGE_TASK_NAME,
+                DependencyFregeTask.class, task -> {
+                    task.dependsOn(setupFregeCompilerTask);
+                    task.getClasspath().setFrom(setupClasspath(project, implementation,
+                            setupFregeCompilerTask.get().getFregeCompilerOutputPath()));
+                });
         project.getTasks().register(REPL_FREGE_TASK_NAME, ReplFregeTask.class, task -> {
             task.dependsOn(setupFregeCompilerTask);
-            task.getFregeCompilerJar().set(setupFregeCompilerTask.get().getFregeCompilerOutputPath());
-            task.getFregeDependencies().set(implementation.getAsPath());
+            task.getFregeClasspath().setFrom(setupClasspath(project, implementation,
+                    setupFregeCompilerTask.get().getFregeCompilerOutputPath()));
         });
     }
 }
diff --git a/src/main/java/ch/fhnw/thga/gradleplugins/ReplFregeTask.java b/src/main/java/ch/fhnw/thga/gradleplugins/ReplFregeTask.java
index 5a915c0..81da1cd 100644
--- a/src/main/java/ch/fhnw/thga/gradleplugins/ReplFregeTask.java
+++ b/src/main/java/ch/fhnw/thga/gradleplugins/ReplFregeTask.java
@@ -1,36 +1,19 @@
 package ch.fhnw.thga.gradleplugins;
 
 import org.gradle.api.DefaultTask;
-import org.gradle.api.file.FileCollection;
-import org.gradle.api.file.RegularFileProperty;
-import org.gradle.api.logging.Logger;
-import org.gradle.api.logging.Logging;
-import org.gradle.api.provider.Property;
-import org.gradle.api.provider.Provider;
-import org.gradle.api.tasks.Input;
-import org.gradle.api.tasks.InputFile;
-import org.gradle.api.tasks.Internal;
+import org.gradle.api.file.ConfigurableFileCollection;
+import org.gradle.api.tasks.InputFiles;
 import org.gradle.api.tasks.TaskAction;
 
 public abstract class ReplFregeTask extends DefaultTask {
-    public static final Logger LOGGER = Logging.getLogger(SetupFregeTask.class);
+    public static final String REPL_MAIN_CLASS = "frege.repl.FregeRepl";
 
-    @InputFile
-    public abstract RegularFileProperty getFregeCompilerJar();
-
-    @Input
-    public abstract Property<String> getFregeDependencies();
-
-    @Internal
-    public final Provider<FileCollection> getClasspath() {
-        return getFregeDependencies().map(depsClasspath -> {
-            return depsClasspath.isEmpty() ? getProject().files(getFregeCompilerJar())
-                    : getProject().files(getFregeCompilerJar(), depsClasspath);
-        });
-    }
+    @InputFiles
+    public abstract ConfigurableFileCollection getFregeClasspath();
 
     @TaskAction
-    public void fregeReplDependencies() {
-        System.out.println(getClasspath().get().getAsPath());
+    public void printStartFregeReplCommand() {
+        System.out.println("Execute the following command to start the Frege Repl:");
+        System.out.println(String.format("java -cp %s %s", getFregeClasspath().getAsPath(), REPL_MAIN_CLASS));
     }
 }
diff --git a/src/main/java/ch/fhnw/thga/gradleplugins/internal/DependencyFregeTask.java b/src/main/java/ch/fhnw/thga/gradleplugins/internal/DependencyFregeTask.java
new file mode 100644
index 0000000..34b33a2
--- /dev/null
+++ b/src/main/java/ch/fhnw/thga/gradleplugins/internal/DependencyFregeTask.java
@@ -0,0 +1,16 @@
+package ch.fhnw.thga.gradleplugins.internal;
+
+import org.gradle.api.DefaultTask;
+import org.gradle.api.file.ConfigurableFileCollection;
+import org.gradle.api.tasks.InputFiles;
+import org.gradle.api.tasks.TaskAction;
+
+public abstract class DependencyFregeTask extends DefaultTask {
+    @InputFiles
+    public abstract ConfigurableFileCollection getClasspath();
+
+    @TaskAction
+    public void fregeDependencies() {
+        System.out.println(getClasspath().getAsPath());
+    }
+}