Add CLI

1 files changed, 62 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCli.java b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCli.java
new file mode 100644
index 0000000..a4992e4
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCli.java
@@ -0,0 +1,62 @@
+package org.zwobble.hobgoblin.compiler;
+
+import net.sourceforge.argparse4j.ArgumentParsers;
+import net.sourceforge.argparse4j.ext.java7.PathArgumentType;
+import net.sourceforge.argparse4j.inf.ArgumentParserException;
+import net.sourceforge.argparse4j.inf.Namespace;
+import org.zwobble.hobgoblin.compiler.errors.SourceError;
+import org.zwobble.hobgoblin.compiler.sources.NullSource;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+public class HobgoblinCli {
+    public static void main(String[] rawArgs) throws IOException, InterruptedException {
+        var args = parseArgs(rawArgs);
+        try {
+            compile(args);
+        } catch (SourceError error) {
+            if (!(error.source() instanceof NullSource)) {
+                System.err.println(error.source().describe());
+            }
+            System.err.println(error.getMessage());
+            System.exit(2);
+        }
+    }
+
+    private static void compile(Namespace args) throws IOException, InterruptedException {
+        var sourcePath = args.<Path>get("source");
+
+        switch (args.<Command>get("command")) {
+            case COMPILE -> {
+                HobgoblinCompiler.compile(sourcePath);
+            }
+        }
+    }
+
+    private static Namespace parseArgs(String[] args) {
+        var parser = ArgumentParsers.newFor("hobgoblin").build()
+            .defaultHelp(true);
+
+        var subparsers = parser.addSubparsers();
+
+        var compileSubParser = subparsers.addParser("compile");
+        compileSubParser.setDefault("command", Command.COMPILE);
+        compileSubParser
+            .addArgument("source")
+            .type(new PathArgumentType())
+            .required(true);
+
+        try {
+            return parser.parseArgs(args);
+        } catch (ArgumentParserException e) {
+            parser.handleError(e);
+            System.exit(1);
+            throw new RuntimeException(e);
+        }
+    }
+
+    private enum Command {
+        COMPILE,
+    }
+}