From ba5f68aa1f6e909dad92dac0fdbf6cf808fbfe76 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 26 May 2026 19:47:05 +0100
Subject: Add CLI

---
 makefile                                           |  4 ++
 pom.xml                                            | 36 +++++++++++++
 .../zwobble/hobgoblin/compiler/HobgoblinCli.java   | 62 ++++++++++++++++++++++
 3 files changed, 102 insertions(+)
 create mode 100644 makefile
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/HobgoblinCli.java

diff --git a/makefile b/makefile
new file mode 100644
index 0000000..66b9e08
--- /dev/null
+++ b/makefile
@@ -0,0 +1,4 @@
+.PHONY: package
+
+package:
+	mvn package -Dmaven.test.skip=true
diff --git a/pom.xml b/pom.xml
index c9af6b7..60dcf8a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,6 +55,11 @@
   </dependencyManagement>
 
   <dependencies>
+    <dependency>
+      <groupId>net.sourceforge.argparse4j</groupId>
+      <artifactId>argparse4j</artifactId>
+      <version>0.9.0</version>
+    </dependency>
     <dependency>
       <groupId>org.zwobble.source-text</groupId>
       <artifactId>source-text</artifactId>
@@ -80,6 +85,37 @@
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>3.4.1</version>
+        <configuration>
+          <createDependencyReducedPom>false</createDependencyReducedPom>
+          <filters>
+            <filter>
+              <artifact>*:*</artifact>
+              <excludes>
+                <exclude>META-INF/*</exclude>
+              </excludes>
+            </filter>
+          </filters>
+          <transformers>
+            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+              <manifestEntries>
+                <Main-Class>org.zwobble.hobgoblin.compiler.HobgoblinCli</Main-Class>
+              </manifestEntries>
+            </transformer>
+          </transformers>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.sonatype.central</groupId>
         <artifactId>central-publishing-maven-plugin</artifactId>
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,
+    }
+}
-- 
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