TravBot-v3/src/commands/system/help.ts

import Command from "../../core/command";
import {toTitleCase} from "../../core/lib";
import {loadableCommands, categories} from "../../core/command";
import {getPermissionName} from "../../core/permissions";

export default new Command({
    description: "Lists all commands. If a command is specified, their arguments are listed as well.",
    usage: "([command, [subcommand/type], ...])",
    aliases: ["h"],
    async run($) {
        const commands = await loadableCommands;
        let output = `Legend: \`<type>\`, \`[list/of/stuff]\`, \`(optional)\`, \`(<optional type>)\`, \`([optional/list/...])\``;

        for (const [category, headers] of categories) {
            output += `\n\n===[ ${toTitleCase(category)} ]===`;

            for (const header of headers) {
                if (header !== "test") {
                    const command = commands.get(header);

                    if (!command)
                        return console.warn(
                            `Command "${header}" of category "${category}" unexpectedly doesn't exist!`
                        );

                    output += `\n- \`${header}\`: ${command.description}`;
                }
            }
        }

        $.channel.send(output, {split: true});
    },
    any: new Command({
        async run($) {
            const commands = await loadableCommands;
            let header = $.args.shift() as string;
            let command = commands.get(header);

            if (!command || header === "test") {
                $.channel.send(`No command found by the name \`${header}\`!`);
                return;
            }

            if (command.originalCommandName) header = command.originalCommandName;
            else console.warn(`originalCommandName isn't defined for ${header}?!`);

            let permLevel = command.permission ?? 0;
            let usage = command.usage;
            let invalid = false;

            let selectedCategory = "Unknown";

            for (const [category, headers] of categories) {
                if (headers.includes(header)) {
                    if (selectedCategory !== "Unknown")
                        console.warn(
                            `Command "${header}" is somehow in multiple categories. This means that the command loading stage probably failed in properly adding categories.`
                        );
                    else selectedCategory = toTitleCase(category);
                }
            }

            for (const param of $.args) {
                const type = command.resolve(param);
                command = command.get(param);
                permLevel = command.permission ?? permLevel;

                switch (type) {
                    case Command.TYPES.SUBCOMMAND:
                        header += ` ${command.originalCommandName}`;
                        break;
                    case Command.TYPES.USER:
                        header += " <user>";
                        break;
                    case Command.TYPES.NUMBER:
                        header += " <number>";
                        break;
                    case Command.TYPES.ANY:
                        header += " <any>";
                        break;
                    default:
                        header += ` ${param}`;
                        break;
                }

                if (type === Command.TYPES.NONE) {
                    invalid = true;
                    break;
                }
            }

            if (invalid) {
                $.channel.send(`No command found by the name \`${header}\`!`);
                return;
            }

            let append = "";

            if (usage === "") {
                const list: string[] = [];

                command.subcommands.forEach((subcmd, subtag) => {
                    // Don't capture duplicates generated from aliases.
                    if (subcmd.originalCommandName === subtag) {
                        const customUsage = subcmd.usage ? ` ${subcmd.usage}` : "";
                        list.push(`- \`${header} ${subtag}${customUsage}\` - ${subcmd.description}`);
                    }
                });

                const addDynamicType = (cmd: Command | null, type: string) => {
                    if (cmd) {
                        const customUsage = cmd.usage ? ` ${cmd.usage}` : "";
                        list.push(`- \`${header} <${type}>${customUsage}\` - ${cmd.description}`);
                    }
                };

                addDynamicType(command.user, "user");
                addDynamicType(command.number, "number");
                addDynamicType(command.any, "any");

                append = "Usages:" + (list.length > 0 ? `\n${list.join("\n")}` : " None.");
            } else append = `Usage: \`${header} ${usage}\``;

            let aliases = "None";

            if (command.aliases.length > 0) {
                aliases = "";

                for (let i = 0; i < command.aliases.length; i++) {
                    const alias = command.aliases[i];
                    aliases += `\`${alias}\``;

                    if (i !== command.aliases.length - 1) aliases += ", ";
                }
            }

            $.channel.send(
                `Command: \`${header}\`\nAliases: ${aliases}\nCategory: \`${selectedCategory}\`\nPermission Required: \`${getPermissionName(
                    permLevel
                )}\` (${permLevel})\nDescription: ${command.description}\n${append}`,
                {split: true}
            );
        }
    })
});