export function getLinkIncludingCursor(){
	const cursor = document.getElementById('text-input');
	const editor = document.getElementById('editor');
    const cursorLine = editor.getElementsByClassName('cursor-line')[0];
    if(!cursor || !editor || !cursorLine) return undefined;
    
    // 現在行からリンクを探す
    const links = cursorLine.getElementsByClassName('page-link');
    
 	// cursorを含むlinkを抽出して返す
    for (const link of links) {
    	const startLeft = getLeftPosition(link.firstElementChild, cursorLine);// '['の右端の座標
        const endLeft = getLeftPosition(link.lastElementChild, cursorLine);// ']'の左端の座標
        const cursorLeft = parseInt(cursor.style.left);// cursorの左端の座標
        
        if (startLeft <= cursorLeft && cursorLeft <= endLeft) return link;
    }
   	return undefined;
}
// 要素の左端の相対座標を取得する
function getLeftPosition(targetElement, cursorLine){
	return targetElement.getBoundingClientRect().left 
		- cursorLine.getBoundingClientRect().left;
}