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VimでBad Apple!!

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こんにちわ。
ゴリラ.vimを運営しているゴリラです。

最近Vimのプラグインを作るのにハマっています。先日もdocker.vimというVimからdockerコンテナを操作するプラグインを作りました。
良かった試してみてください。

さて、本題ですがみなさんはBad Apple!!をご存知でしょうか?
多分ニコニコユーザならほぼ知っているのではないかと思います。
そうです。かの有名な動画です。

その動画のAscii版があり、それならVimで再生できるのでは?と思い帰りの電車の中で作ってみました。

どんな感じ?

こんな感じです。
すこしちらつきますが、まぁ見れなくはないかなと言った感じです。

bad_apple.gif

仕組みは?

とっても簡単です。簡潔に言うとテキストファイルを読み込み、フレーム分のテキストを配列に格納して、あとはfor分で回して画面に描写します。

もう少し細かく解説します。

Asciiテキストファイルの読み込み

Bad Apple!のAsciiテキストファイルはこちらにあるので、それを借用しました。


テキストファイル

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見て分かる通り、SPLITで区切っています。なので、SPLITまでを1フレームとしてます。
処理は次になります。

" read file to create framesfunction!s:read_file() abort
    letfile= globpath(&rtp,'resources/badapple.txt')" 全frameを格納let frames =[]" 1frame分のテキストを格納let frame =[]for line in readfile(file)" 現在行に`SPLIT`が含まれていなければframeに追加if line !~# "SPLIT"call add(frame, line)else" frameをframes追加call add(frames, frame)let frame =[]endifendforreturn frames
endfunction

なぜframeを配列にしているかというと、vimではバッファにテキストを書き込むsetline()とpopup windowのバッファに書き込むpopup_settext()という関数がありますが、
引数に配列を渡すと配列の1要素が1行として画面に出力します。そうすることで改行文字をわざわざ追加しなくて済むのでコードがスッキリします。

画面に出力する

フレームを作る関数を用意したので、それを使用してフレーム情報を変数に格納し、forで1frameずつ画面に出力します。

for frame in frames
    " ここで画面にframeを出力するcall popup_settext(winid, frame)" redraw!で画面を再描写する"redraw!" 一瞬で出力が終わってしまうので少し待つ
    sleep 50ms
    " qで終了できるように`getchar()`で入力した文字を取得" キー入力を待たないように、引数に`0`を渡すlet key = getchar(0)if key ==# 113breakendifendfor" for分を抜けたらウィンドウを閉じる"call popup_close(winid)

まとめ

動画をAsciiテキストに変換して、フレームを定義すれば、どんなものでも同じようなロジックでVim再生できます。
興味ある方はぜひチャレンジしてみてください。


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