Move client config file logic, docs

client/config_unix.go

@@ -0,0 +1,18 @@
+//go:build linux || dragonfly || freebsd || netbsd || openbsd
+
+package client
+
+import (
+	"os"
+	"os/user"
+	"path/filepath"
+)
+
+func init() {
+	u, err := user.Current()
+	if err == nil && u.Uid == "0" {
+		DefaultConfigFile = "/etc/ntfy/client.yml"
+	} else if configDir, err := os.UserConfigDir(); err == nil {
+		DefaultConfigFile = filepath.Join(configDir, "ntfy", "client.yml")
+	}
+}