feat(config): 'use' layer stack + CalendarsDir()

2 files changed, 40 insertions, 0 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index bf46224..2fb4daa 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -45,6 +45,8 @@ const configHeader = `# lectio configuration (INI). Full-line comments only (# o
 #   web_mono          true | false             (monospace reading face in the web UI)
 #   web_versions      any of: bt, wuj, vul, grb, drb (comma list); empty = just default_version
 #   pager             shell command, e.g. less -R; empty = off
+#   use               calendar layers to stack over the universal calendar: names of
+#                     ~/.config/lectio/calendars/<name>.ini files (comma list, order = precedence)
 #
 # [calendar] — computed-calendar placement options (defaults = Universal Roman Calendar):
 #   epiphany          fixed | sunday    (fixed = Jan 6; sunday = the Sunday of Jan 2-8)
@@ -165,6 +167,10 @@ type Config struct {
 	CalEpiphany      string `toml:"-"`
 	CalAscension     string `toml:"-"`
 	CalCorpusChristi string `toml:"-"`
+
+	// Use is the ordered stack of user calendar-layer ids (INI "use"); each id
+	// names a <CalendarsDir>/<id>.ini file layered over the universal calendar.
+	Use []string `toml:"-"`
 }
 
 // PartShown reports whether a part renders: true unless explicitly set false.
@@ -254,6 +260,16 @@ func configPath() (path string, isDefault bool, err error) {
 	return filepath.Join(dir, "lectio", "config.ini"), true, nil
 }
 
+// CalendarsDir returns the directory holding user calendar-layer files
+// (<config dir>/calendars).
+func CalendarsDir() (string, error) {
+	p, _, err := configPath()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(filepath.Dir(p), "calendars"), nil
+}
+
 // BooksPath returns the path to the optional user books.toml (in the same
 // directory as the config file). There is no embedded seed on disk -- absence
 // means "use the built-in defaults".
@@ -438,6 +454,8 @@ func applyScalar(cfg *Config, key, val string) {
 		cfg.WebVersions = ini.List(val)
 	case "pager":
 		cfg.Pager = val
+	case "use":
+		cfg.Use = ini.List(val)
 	}
 }
 
@@ -511,6 +529,7 @@ func renderConfigINI(cfg Config) []byte {
 	fmt.Fprintf(&b, "web_mono = %t\n", cfg.WebMono)
 	fmt.Fprintf(&b, "web_versions = %s\n", strings.Join(cfg.WebVersions, ", "))
 	fmt.Fprintf(&b, "pager = %s\n", cfg.Pager)
+	fmt.Fprintf(&b, "use = %s\n", strings.Join(cfg.Use, ", "))
 
 	b.WriteString("\n# Computed-calendar national placement options.\n[calendar]\n")
 	fmt.Fprintf(&b, "epiphany = %s\n", orDefault(cfg.CalEpiphany, "fixed"))
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 38c7604..e3af475 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -239,6 +239,27 @@ func TestSelectionFromINI(t *testing.T) {
 	}
 }
 
+func TestUseLayers(t *testing.T) {
+	dir := t.TempDir()
+	t.Setenv("LECTIO_CONFIG", filepath.Join(dir, "config.ini"))
+	os.WriteFile(filepath.Join(dir, "config.ini"), []byte("use = poland, krakow\n"), 0o644)
+	cfg, err := Load()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cfg.Use) != 2 || cfg.Use[0] != "poland" || cfg.Use[1] != "krakow" {
+		t.Fatalf("Use = %v", cfg.Use)
+	}
+	// round-trips through Save
+	if err := Save(cfg); err != nil {
+		t.Fatal(err)
+	}
+	got, _ := Load()
+	if len(got.Use) != 2 || got.Use[1] != "krakow" {
+		t.Errorf("Use after round-trip = %v", got.Use)
+	}
+}
+
 func TestMigrateTOMLToINI(t *testing.T) {
 	dir := t.TempDir()
 	t.Setenv("XDG_CONFIG_HOME", dir)