slate-edit-code/dist/transforms/indentLines.js

A Slate plugin to handle keyboard events in code blocks.

'use strict';

var getLines = require('../getLines');

/**
 * Indent all lines in selection
 * @param  {Transform} transform
 * @param  {String} indent
 * @return {Transform}
 */
function indentLines(transform, indent) {
    var state = transform.state;
    var startBlock = state.startBlock;
    var endBlock = state.endBlock;
    var startOffset = state.startOffset;
    var endOffset = state.endOffset;
    var selection = state.selection;


    var innerText = startBlock.text;
    var lines = getLines(innerText);

    if (startBlock != endBlock) {
        endOffset = innerText.length;
    }

    var offset = 0;
    innerText = lines.map(function (line) {
        var result = line;

        if (offset >= startOffset && offset < endOffset) {
            result = indent + line;
        }

        offset += line.length;
        return result;
    }).join('\n');

    return transform.insertTextAtRange(selection.moveToRangeOf(startBlock), innerText);
}

module.exports = indentLines;