Split up logger and widget

This allows us to use the logger from the wtf directory
For example when trying to debug sort ordering in focus_tracker

utils/homedir.go

@@ -0,0 +1,49 @@
+// Package homedir helps with detecting and expanding the user's home directory
+
+// Copied (mostly) verbatim from https://github.com/Atrox/homedir
+
+package utils
+
+import (
+	"errors"
+	"os/user"
+	"path/filepath"
+)
+
+// Dir returns the home directory for the executing user.
+// An error is returned if a home directory cannot be detected.
+func Home() (string, error) {
+	currentUser, err := user.Current()
+	if err != nil {
+		return "", err
+	}
+	if currentUser.HomeDir == "" {
+		return "", errors.New("cannot find user-specific home dir")
+	}
+
+	return currentUser.HomeDir, nil
+}
+
+// Expand expands the path to include the home directory if the path
+// is prefixed with `~`. If it isn't prefixed with `~`, the path is
+// returned as-is.
+func ExpandHomeDir(path string) (string, error) {
+	if len(path) == 0 {
+		return path, nil
+	}
+
+	if path[0] != '~' {
+		return path, nil
+	}
+
+	if len(path) > 1 && path[1] != '/' && path[1] != '\\' {
+		return "", errors.New("cannot expand user-specific home dir")
+	}
+
+	dir, err := Home()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, path[1:]), nil
+}