config: add default path, customized configs.

A customised config is an ini file with a [default] section and some
other name sections; a config file is loaded from the default section
with any keys in the named section being added in, overriding keys in
the host. This allows for, e.g. setting different paths based on the
host name or operating system.

config/path_linux.go

@@ -0,0 +1,43 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// canUseXDGConfigDir checks whether the XDG config directory exists
+// and is accessible by the current user. If it is present, it will
+// be returned. Note that if the directory does not exist, it is
+// presumed unusable.
+func canUseXDGConfigDir() (string, bool) {
+	xdgDir := os.Getenv("XDG_CONFIG_DIR")
+	if xdgDir == "" {
+		userDir := os.Getenv("HOME")
+		if userDir == "" {
+			return "", false
+		}
+
+		xdgDir = filepath.Join(userDir, ".config")
+	}
+
+	fi, err := os.Stat(xdgDir)
+	if err != nil {
+		return "", false
+	}
+
+	if !fi.IsDir() {
+		return "", false
+	}
+
+	return xdgDir, true
+}
+
+// DefaultConfigPath returns a sensible default configuration file path.
+func DefaultConfigPath(dir, base string) string {
+	dirPath, ok := canUseXDGConfigDir()
+	if !ok {
+		dirPath = "/etc"
+	}
+
+	return filepath.Join(dirPath, dir, base)
+}