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Makeのhelpコマンドでターゲットの一覧を出す。

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Makeファイルを便利なタスクランナーとして使ってると、ターゲットがいっぱい増えてきて、何がなんだかわからなくなっちゃうので、簡単なhelpコマンドを作ると良い。

Makefile
#: ヘルプコマンド
help:
	@grep -A1 -E "^#:" Makefile \
	| grep -v -- -- \
	| sed 'N;s/\n/###/' \
	| sed -n 's/^#: \(.*\)###\(.*\):.*/\2###\1/p' \
	| column -t  -s '###'

#: ビルド
build:
    buid command

Makefileに↑こんな感じで、helpコマンドを実装。
ターゲットの1行上に#: に続けてコメントを書いておくと、

$ make help
help                  ヘルプコマンド
build                 ビルド

こんなかんじで、一覧を出力してくれる。

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