feat(tempconvert): add tempconvert command

package.json

@@ -28,6 +28,7 @@
     "@skyra/decorators": "^3.0.0",
     "axios": "^0.21.1",
     "common-tags": "^1.8.0",
+    "convert-units": "^2.3.4",
     "discord.js": "^12.5.1",
     "genius-lyrics": "^4.0.0",
     "klasa": "git://github.com/tuataria/klasa.git#725632bfcfc135bc49f5b102b67c726dac72d015",
@@ -48,6 +49,7 @@
     "@babel/preset-env": "^7.12.11",
     "@types/backoff": "^2.5.1",
     "@types/common-tags": "^1.8.0",
+    "@types/convert-units": "^2.3.3",
     "@types/jest": "^26.0.20",
     "@types/mongodb": "^3.3.16",
     "@types/node-fetch": "^2.5.4",

src/commands/Unit Conversions/tempconvert.ts

@@ -0,0 +1,49 @@
+import { SteveCommand } from '@lib/structures/commands/SteveCommand';
+import { ApplyOptions, CreateResolvers } from '@skyra/decorators';
+import { MessageEmbed } from 'discord.js';
+import { CommandOptions, KlasaMessage } from 'klasa';
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const convert = require('convert-units');
+
+@ApplyOptions<CommandOptions>({
+	aliases: ['temp'],
+	description: lang => lang.tget('commandTempConvertDescription'),
+	extendedHelp: lang => lang.tget('commandTempConvertExtended'),
+	usage: '<number:number> <firstUnit:unit> <secondUnit:unit>'
+})
+@CreateResolvers([
+	[
+		'unit',
+		(str, possible, msg) => {
+			str = str.toUpperCase();
+
+			if (['C', 'F', 'K', 'R'].includes(str)) return str;
+			if (str === 'CELSIUS' || str === 'FAHRENHEIT' || str === 'KELVIN' || str === 'RANKINE') return str[1];
+
+			throw msg.language.tget('commandTempConvertInvalidUnit', str);
+		}
+	]
+])
+export default class extends SteveCommand {
+
+	public async run(msg: KlasaMessage, [num, unitConvertingFrom, unitConvertingTo]: [number, temperatureUnit, temperatureUnit]) {
+		// eslint-disable-next-line newline-per-chained-call
+		const convertedValue = Number(convert(num).from(unitConvertingFrom).to(unitConvertingTo).toFixed(2));
+
+		const embed = new MessageEmbed()
+			.addFields(
+				{ name: this.getFullUnitName(unitConvertingFrom), value: num, inline: true },
+				{ name: this.getFullUnitName(unitConvertingTo), value: convertedValue, inline: true }
+			)
+			.setColor(0x71adcf);
+
+		return msg.channel.send(embed);
+	}
+
+	private getFullUnitName(unit: temperatureUnit) {
+		return convert().describe(unit).singular.split(' ')[1];
+	}
+
+}
+
+type temperatureUnit = 'C' | 'F' | 'K' | 'R';

src/languages/en-US.ts

@@ -1135,6 +1135,22 @@ export default class extends Language {
 		commandFeedbackNoChannel: 'The specified feedback channel for this bot does not exist; contact a bot owner.',
 		commandFeedbackSent: 'Your feedback has been sent, thanks!',
 		commandSupportDescription: `Get a link to ${botName}'s support server.`,
+		/**
+		 * ################################
+		 * #   UNIT CONVERSION COMMANDS   #
+		 * ################################
+		 */
+		commandTempConvertDescription: 'Easily convert temperatures',
+		commandTempConvertExtended: builder.display('tempconvert', {
+			examples: [
+				'32|f|c',
+				'0|celsius|fahrenheit'
+			],
+			explainedUsage: [
+				['unit', 'Supported units: Celsius (C), Fahrenheit (F), Kelvin (K), Rankine (R)']
+			]
+		}),
+		commandTempConvertInvalidUnit: unit => `**${unit}** is not a valid/supported unit.`,
 		/**
 		 * ################################
 		 * #  LOG EVENT  TOGGLE COMMANDS  #

src/lib/types/Languages.d.ts

@@ -458,6 +458,9 @@ declare module 'klasa' {
 		commandFeedbackNoChannel: string;
 		commandFeedbackSent: string;
 		commandSupportDescription: string;
+		commandTempConvertDescription: string;
+		commandTempConvertExtended: string;
+		commandTempConvertInvalidUnit: (unit: string) => string;
 		commandToggleChannelCreateDescription: string;
 		commandToggleChannelCreate: (disabled: boolean) => string;
 		commandToggleChannelDeleteDescription: string;