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/*
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 *  This file is part of CoCalc: Copyright © 2020 Sagemath, Inc.
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 *  License: MS-RSL – see LICENSE.md for details
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 */
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import * as CodeMirror from "codemirror";
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import { cm_start_end } from "./util";
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CodeMirror.defineExtension("unindent_selection", function () {
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  // @ts-ignore
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  const editor = this;
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  for (let selection of editor.listSelections()) {
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    const { start_line, end_line } = cm_start_end(selection);
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    let all_need_unindent = true;
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    for (let n = start_line; n <= end_line; n++) {
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      const s = editor.getLine(n);
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      if (s == null) {
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        return;
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      }
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      if (s.length === 0 || s[0] === "\t" || s[0] === " ") {
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        continue;
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      } else {
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        all_need_unindent = false;
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        break;
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      }
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    }
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    if (all_need_unindent) {
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      for (let n = start_line; n <= end_line; n++) {
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        editor.indentLine(n, "subtract");
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      }
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    }
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  }
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});
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