japanese-hiragana-region リージョン内のひらがなをカタカナに変換する。まさかのEmacs標準機能。なおカタカナバージョンもある emacs/japan-util.el at master · emacs-mirror/emacs · GitHub

The defvar special form is similar to setq in that it sets the value of a variable. It is unlike setq in two ways: first, it only sets the value of the variable if the variable does not already have a value. If the variable already has a v…