From 23fbd3fb827b99516fc367d2d51e79c48d348005 Mon Sep 17 00:00:00 2001
From: packet-mover <hello@codatus.com>
Date: Sun, 5 Apr 2026 23:07:34 +0200
Subject: [PATCH] feat: add Has LICENSE rule

Check for LICENSE or LICENSE.md in the repo root.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 rules.go      |  9 +++++++++
 rules_test.go | 24 ++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/rules.go b/rules.go
index 61347d5..bdbf895 100644
--- a/rules.go
+++ b/rules.go
@@ -20,6 +20,7 @@ func AllRules() []Rule {
 		HasRepoDescription{},
 		HasGitignore{},
 		HasSubstantialReadme{},
+		HasLicense{},
 	}
 }
 
@@ -48,6 +49,14 @@ func (r HasSubstantialReadme) Check(repo Repo) bool {
 	return ok && f.Size > 2048
 }
 
+// HasLicense checks that a LICENSE or LICENSE.md file exists in the repo root.
+type HasLicense struct{}
+
+func (r HasLicense) Name() string { return "Has LICENSE" }
+func (r HasLicense) Check(repo Repo) bool {
+	return hasFile(repo.Files, "LICENSE") || hasFile(repo.Files, "LICENSE.md")
+}
+
 func findFile(files []FileEntry, name string) (FileEntry, bool) {
 	for _, f := range files {
 		if f.Name == name {
diff --git a/rules_test.go b/rules_test.go
index 0f27679..52c5f75 100644
--- a/rules_test.go
+++ b/rules_test.go
@@ -73,3 +73,27 @@ func TestHasSubstantialReadme_Fail_Missing(t *testing.T) {
 		t.Error("expected fail when README.md is missing")
 	}
 }
+
+func TestHasLicense_Pass_LICENSE(t *testing.T) {
+	rule := HasLicense{}
+
+	if !rule.Check(Repo{Files: []FileEntry{{Name: "LICENSE"}}}) {
+		t.Error("expected pass when LICENSE exists")
+	}
+}
+
+func TestHasLicense_Pass_LICENSEmd(t *testing.T) {
+	rule := HasLicense{}
+
+	if !rule.Check(Repo{Files: []FileEntry{{Name: "LICENSE.md"}}}) {
+		t.Error("expected pass when LICENSE.md exists")
+	}
+}
+
+func TestHasLicense_Fail(t *testing.T) {
+	rule := HasLicense{}
+
+	if rule.Check(Repo{Files: []FileEntry{{Name: "README.md"}}}) {
+		t.Error("expected fail when no LICENSE file exists")
+	}
+}