feat(config): load ntfy client.yml and resolve topic origins

Parse the official ntfy client configuration, apply command-line overrides, and turn short names, host/topic pairs, and absolute URLs into an origin and topic name.

internal/config/config_test.go

@@ -0,0 +1,82 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoadSubscribeAndTokenOverride(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "client.yml")
+	body := []byte(`
+default-host: https://ntfy.example
+default-token: tk_default
+subscribe:
+  - topic: alerts
+    command: notify-send
+  - topic: public
+    token: ""
+  - topic: other.example/ops
+    user: ada
+    password: secret
+`)
+	if err := os.WriteFile(path, body, 0o600); err != nil {
+		t.Fatal(err)
+	}
+	app, err := Load(Options{Path: path, PathSet: true, Since: "1h"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if app.Since != "1h" || len(app.Subs) != 3 {
+		t.Fatalf("app: %+v", app.Subs)
+	}
+	if app.Subs[0].Name != "alerts" || app.Subs[0].Origin != "https://ntfy.example" || app.Subs[0].Auth.Token != "tk_default" {
+		t.Fatalf("alerts: %+v", app.Subs[0])
+	}
+	if app.Subs[1].Auth.Token != "" || app.Subs[1].Auth.User != "" {
+		t.Fatalf("empty token should clear auth: %+v", app.Subs[1].Auth)
+	}
+	if app.Subs[2].Origin != "https://other.example" || app.Subs[2].Name != "ops" || app.Subs[2].Auth.User != "ada" || app.Subs[2].Auth.Password != "secret" {
+		t.Fatalf("per-topic user: %+v", app.Subs[2])
+	}
+}
+
+func TestPositionalTopicsReplaceSubscribe(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "client.yml")
+	body := []byte("default-host: https://ntfy.example\ndefault-token: tk_default\nsubscribe:\n  - topic: ignored\n")
+	if err := os.WriteFile(path, body, 0o600); err != nil {
+		t.Fatal(err)
+	}
+	app, err := Load(Options{Path: path, PathSet: true, Topics: []string{"alerts"}, User: "ada:pw"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(app.Subs) != 1 || app.Subs[0].Name != "alerts" || app.Subs[0].Auth.Token != "" || app.Subs[0].Auth.User != "ada" {
+		t.Fatalf("%+v", app.Subs[0])
+	}
+}
+
+func TestHostWithoutTopicsStartsEmpty(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "client.yml")
+	body := []byte("default-host: https://ntfy.example\ndefault-token: tk_default\n")
+	if err := os.WriteFile(path, body, 0o600); err != nil {
+		t.Fatal(err)
+	}
+	app, err := Load(Options{Path: path, PathSet: true})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if app.DefaultHost != "https://ntfy.example" || len(app.Subs) != 0 || app.Auth.Token != "tk_default" {
+		t.Fatalf("%+v", app)
+	}
+}
+
+func TestMissingDefaultFileNeedsTopic(t *testing.T) {
+	_, err := Load(Options{Path: filepath.Join(t.TempDir(), "missing.yml")})
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}