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index.js
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index.js
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#!/usr/bin/env node
// dependencies
const dayjs = require('dayjs');
const readline = require('readline');
// create node readline interface to handle input stream
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
terminal: false,
});
// regex to test if the time is in the valid format
const timeRegex = /^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$/;
// get input time
const inputTimeString = process.argv[2] || null;
// create dayjs object from input time - HH:mm
function parseTimeString(timeString) {
return dayjs()
.set('h', timeString.split(':')[0])
.set('m', timeString.split(':')[1]);
}
// create dayjs object from crontab time - * 10
function parseCronTime(hour, minute, referenzTime) {
let time = dayjs();
function nextTick(value) {
return value === '*';
}
// set time based on crontab value
time = nextTick(hour) ? time.set('h', referenzTime.hour()) : time.set('h', hour);
time = nextTick(minute) ? time.set('m', referenzTime.minute()) : time.set('m', minute);
return time;
}
// checks if single line in crontab is valid
function isValidCronLine(lineParams) {
// TODO: check single paramter to be true
// eg if number or *
return lineParams.length === 3;
}
function main() {
// check if time parameter is valid
if (!inputTimeString || !timeRegex.test(inputTimeString)) {
console.log('Error: invalid time parameter');
return false;
}
const referenceTime = parseTimeString(inputTimeString);
// loop over lines in crontab file
rl.on('line', function(line) {
const lineParams = line.split(' ');
if (!isValidCronLine(lineParams)) {
// output empty line if crontab is invalid
console.log();
} else {
const time = parseCronTime(lineParams[1], lineParams[0], referenceTime);
console.log(
`${time.format('HH:mm')}`,
referenceTime.isBefore(time) ? 'today' : 'tomorrow',
'-',
lineParams[2]
);
}
});
return true;
}
// entry point
main();