Tomo will call the parse functions in Theme and Config

tomo.go

@@ -1,5 +1,9 @@
 package tomo
 
+import "os"
+import "io"
+import "path/filepath"
+import "git.tebibyte.media/sashakoshka/tomo/dirs"
 import "git.tebibyte.media/sashakoshka/tomo/data"
 import "git.tebibyte.media/sashakoshka/tomo/theme"
 import "git.tebibyte.media/sashakoshka/tomo/config"
@@ -12,6 +16,9 @@ var backend Backend
 // the backend experiences a fatal error.
 func Run (callback func ()) (err error) {
 	backend, err = instantiateBackend()
+	config := parseConfig()
+	backend.SetConfig(config)
+	backend.SetTheme(parseTheme(config.ThemePath()))
 	if callback != nil { callback() }
 	err = backend.Run()
 	backend = nil
@@ -63,6 +70,60 @@ func SetConfig (config config.Config) {
 	backend.SetConfig(config)
 }
 
+func parseConfig () (config.Config) {
+	return parseMany [config.Config] (
+		dirs.ConfigDirs("tomo/tomo.conf"),
+		config.Parse,
+		config.Default { })
+}
+
+func parseTheme (path string) (theme.Theme) {
+	if path == "" { return theme.Default { } }
+	path = filepath.Join(path, "tomo")
+	
+	// find all tomo pattern graph files in the directory
+	directory, err := os.Open(path)
+	if err != nil { return theme.Default { } }
+	names, _ := directory.Readdirnames(0)
+	paths := []string { }
+	for _, name := range names {
+		if filepath.Ext(name) == ".tpg" {
+			paths = append(paths, filepath.Join(path, name))
+		}
+	}
+
+	// parse them
+	return parseMany [theme.Theme] (
+		paths,
+		theme.Parse,
+		theme.Default { })
+}
+
+func parseMany [OBJECT any] (
+	paths []string,
+	parser func (...io.Reader) OBJECT,
+	fallback OBJECT,
+) (
+	object OBJECT,
+) {
+	// convert all paths into readers
+	sources := []io.Reader { }
+	for _, path := range paths {
+		file, err := os.Open(path)
+		if err != nil { continue }
+		sources = append(sources, file)
+		defer file.Close()
+	}
+	
+	if sources == nil {
+		// if there are no readers, return the fallback object
+		return fallback
+	} else {
+		// if there are readers, parse them
+		return parser(sources...)
+	}
+}
+
 func assertBackend () {
 	if backend == nil { panic("no backend is running") }
 }