[srt] merge line with same time code

mergeLine.js

const subtitle = require("subtitle")
const fs = require("fs")
const path = require("path")

function merge(parsed) {
    let i = 0, currentStart = parsed[i].start, currentEnd = parsed[i].end, text = parsed[i].text, pushed = true
    const result = []
    i++
    for (;i < parsed.length; i++) {
        if (currentStart !== parsed[i].start && currentEnd !== parsed[i].end) {
            result.push({
                start: currentStart,
                end: currentEnd,
                text
            })
            text = parsed[i].text
            currentStart = parsed[i].start
            currentEnd = parsed[i].end
            pushed = true
        } else {
            text += '\n' + parsed[i].text
            pushed= false
        }
    }
    // The last entry
    if (!pushed) 
        result.push({
            start: currentStart,
            end: currentEnd,
            text
        })
    return result
}

const infile = process.argv[2]
const outfile = process.argv[3] || 'converted.srt'
if (infile && outfile) {
    const workdir = process.cwd()
    const input = path.resolve(workdir, infile)
    const output = path.resolve(workdir, outfile)
    const origin = fs.readFileSync(input, 
                {encoding:'utf8', flag:'r'}); 
    const parsed = subtitle.parse(origin)
    const result = merge(parsed)
    const stringify = subtitle.stringify(result)
    fs.writeFileSync(output, stringify);
} else {
    console.log("Usage: node mergeLine.js [inputFile] [outputFile]")
}