From 5e01c04ff01480f48bb332652920ec1254251ee0 Mon Sep 17 00:00:00 2001
From: abhinavgautam01 <abgautam1017@gmail.com>
Date: Fri, 16 Oct 2026 11:21:06 +0530
Subject: [PATCH] Name the missing import in the unknown ecosystem error

---
 internal/core/registry.go      |  4 +++-
 internal/core/registry_test.go | 24 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 internal/core/registry_test.go

diff --git a/internal/core/registry.go b/internal/core/registry.go
index 77bf229..98871da 100644
--- a/internal/core/registry.go
+++ b/internal/core/registry.go
@@ -52,10 +52,12 @@ func New(ecosystem string, baseURL string, client *Client) (Registry, error) { /
 	mu.RLock()
 	factory, ok := factories[ecosystem]
 	defaultURL := defaults[ecosystem]
+	registered := len(factories)
 	mu.RUnlock()
 
 	if !ok {
-		return nil, fmt.Errorf("unknown ecosystem: %s", ecosystem)
+		return nil, fmt.Errorf("unknown ecosystem %q (%d registered; import _ %q or the specific ecosystem package)",
+			ecosystem, registered, "github.com/git-pkgs/registries/all")
 	}
 
 	if baseURL == "" {
diff --git a/internal/core/registry_test.go b/internal/core/registry_test.go
new file mode 100644
index 0000000..57e6064
--- /dev/null
+++ b/internal/core/registry_test.go
@@ -0,0 +1,24 @@
+package core
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestNewUnknownEcosystemErrorNamesFix(t *testing.T) {
+	_, err := New("no-such-ecosystem", "", nil)
+	if err == nil {
+		t.Fatal("expected error for unknown ecosystem")
+	}
+
+	msg := err.Error()
+	for _, want := range []string{
+		`unknown ecosystem "no-such-ecosystem"`,
+		"0 registered",
+		`import _ "github.com/git-pkgs/registries/all"`,
+	} {
+		if !strings.Contains(msg, want) {
+			t.Errorf("error %q does not contain %q", msg, want)
+		}
+	}
+}