From 8f98dc579af1993ec85bd849656c4835b4039dd6 Mon Sep 17 00:00:00 2001
From: Stefan Weigl-Bosker <stefan@s00.xyz>
Date: Mon, 23 Feb 2026 22:18:22 -0500
Subject: [willow]: frontend plumbing (#13)

...
---
 willow/tools/willowc/lib/driver.cpp | 76 +++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

(limited to 'willow/tools/willowc/lib/driver.cpp')

diff --git a/willow/tools/willowc/lib/driver.cpp b/willow/tools/willowc/lib/driver.cpp
index e69de29..1962da4 100644
--- a/willow/tools/willowc/lib/driver.cpp
+++ b/willow/tools/willowc/lib/driver.cpp
@@ -0,0 +1,76 @@
+#include <print>
+#include <compiler.hpp>
+#include <driver.hpp>
+
+#include <argparse/argparse.hpp>
+
+namespace willowc {
+
+int willowc_main(int argc, char **argv) {
+  argparse::ArgumentParser cl("willowc");
+  cl.set_prefix_chars("-");
+  cl.set_assign_chars("=");
+
+  willowc::Compiler compiler;
+
+  auto &ll = cl.add_mutually_exclusive_group();
+  ll.add_argument("-Lerror")
+      .help("only emit diagnostics on error (default)")
+      .default_value(true)
+      .implicit_value(true)
+      .action(
+          [&](const auto &) { compiler.setLogLevel(willow::Severity::Error); });
+  ll.add_argument("-Lwarn")
+      .help("emit warning messages")
+      .default_value(false)
+      .implicit_value(true)
+      .action([&](const auto &) {
+        compiler.setLogLevel(willow::Severity::Warning);
+      });
+  ll.add_argument("-Linfo")
+      .help("emit remarks")
+      .default_value(false)
+      .implicit_value(true)
+      .action([&](const auto &) {
+        compiler.setLogLevel(willow::Severity::Remark);
+      });
+  ll.add_argument("-Ldebug")
+      .help("emit all diagnostics")
+      .default_value(false)
+      .implicit_value(true)
+      .action(
+          [&](const auto &) { compiler.setLogLevel(willow::Severity::Debug); });
+
+  cl.add_argument("<file>").help("input file path").required().nargs(1);
+
+  if (argc < 2) {
+    std::cerr << cl;
+    return 1;
+  }
+
+  try {
+    cl.parse_args(argc, argv);
+  } catch (std::exception &e) {
+    std::println("error: {}", e.what());
+  }
+
+  std::string f;
+  try {
+    f = cl.get("<file>");
+  } catch (std::exception &e) {
+    std::println("error: {}", e.what());
+    return 1;
+  }
+
+  if (f == "-") {
+    if (willow::failed(compiler.addStdIn()))
+      return 1;
+  } else if (willow::failed(compiler.addSourceFile(f)))
+    return 1;
+
+  compiler.run();
+
+  return 0;
+}
+
+} // namespace willowc
-- 
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