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#!/usr/bin/env node

import fs from 'fs';

import omelette from 'omelette';

import os from 'os';

import path from 'path';

import url from 'url';

import { cli } from './cli/cli.js';

import { CommandInfo } from './cli/CommandInfo.js';

import { CommandOptionInfo } from './cli/CommandOptionInfo.js';

const __dirname = url.fileURLToPath(new URL('.', import.meta.url));

class Autocomplete {

private static autocompleteFilePath: string = path.join(__dirname, `..${path.sep}commands.json`);

private omelette!: omelette.Instance;

private commands: any = {};

constructor() {

this.init();

}

private init(): void {

if (fs.existsSync(Autocomplete.autocompleteFilePath)) {

try {

const data: string = fs.readFileSync(Autocomplete.autocompleteFilePath, 'utf-8');

this.commands = JSON.parse(data);

}

catch {

// Do nothing

}

}

this.omelette = omelette('m365_comp|m365|microsoft365');

this.omelette.on('complete', this.handleAutocomplete.bind(this));

this.omelette.init();

}

public handleAutocomplete(fragment: string, data: omelette.CallbackValue): void {

let replies: any | string[] = {};

let allWords: string[] = [];

if (data.fragment === 1) {

replies = Object.keys(this.commands);

}

else {

allWords = data.line.split(/\s+/).slice(1, -1);

// build array of words to use as a path to retrieve completion

// options from the commands tree

const words: string[] = allWords

.filter((e: string, i: number): boolean => {

if (e.indexOf('-') !== 0) {

// if the word is not an option check if it's not

// option's value, eg. --output json, in which case

// the suggestion should be command options

return i === 0 || allWords[i - 1].indexOf('-') !== 0;

}

else {

// remove all options but last one

return i === allWords.length - 1;

}

});

let accessor = new Function('_', "return _['" + (words.join("']['")) + "']");

try {

replies = accessor(this.commands);

// if the last word is an option without autocomplete

// suggest other options from the same command

if (words[words.length - 1].indexOf('-') === 0 &&

!Array.isArray(replies)) {

accessor = new Function('_', "return _['" + (words.filter(w => w.indexOf('-') !== 0).join("']['")) + "']");

replies = accessor(this.commands);

replies = Object.keys(replies);

}

}

catch {

// Do nothing

}

}

if (!replies) {

replies = [];

}

if (!Array.isArray(replies)) {

replies = Object.keys(replies);

}

// remove options that already have been used

replies = (replies as string[]).filter(r => r.indexOf('-') !== 0 || allWords.indexOf(r) === -1);

data.reply(replies);

}

public generateShCompletion(): void {

const commandsInfo: any = this.getCommandsInfo();

fs.writeFileSync(Autocomplete.autocompleteFilePath, JSON.stringify(commandsInfo));

}

public setupShCompletion(): void {

this.omelette.setupShellInitFile();

}

public getClinkCompletion(): string {

const cmd: any = this.getCommandsInfo();

const lua: string[] = ['local parser = clink.arg.new_parser'];

const functions: any = {};

this.buildClinkForBranch(cmd, functions, 'm365');

Object.keys(functions).forEach(k => {

functions[k] = functions[k].replace(/#([^#]+)#/g, (m: string, p1: string): string => functions[p1]);

});

lua.push(

'local m365_parser = ' + functions['m365'],

'',

'clink.arg.register_parser("m365", m365_parser)',

'clink.arg.register_parser("microsoft365", m365_parser)'

);

return lua.join(os.EOL);

}

private buildClinkForBranch(branch: any, functions: any, luaFunctionName: string): void {

if (!Array.isArray(branch)) {

const keys: string[] = Object.keys(branch);

keys.forEach(k => {

if (Object.keys(branch[k]).length > 0) {

this.buildClinkForBranch(branch[k], functions, this.getLuaFunctionName(`${luaFunctionName}_${k}`));

}

});

}

const parser: string[] = [];

parser.push(

`parser({`

);

let printingArgs: boolean = false;

if (Array.isArray(branch)) {

branch.sort().forEach((c, i) => {

const separator = i < branch.length - 1 ? ',' : '';

parser.push(`"${c}"${separator}`);

});

}

else {

const keys = Object.keys(branch);

if (keys.find(c => c.indexOf('-') === 0)) {

printingArgs = true;

const tmp: string[] = [];

keys.sort().forEach((k) => {

if (Object.keys(branch[k]).length > 0) {

tmp.push(`"${k}"..#${this.getLuaFunctionName(`${luaFunctionName}_${k}`)}#`);

}

else {

tmp.push(`"${k}"`);

}

});

parser.push(`},${tmp.join(', ')}`);

}

else {

keys.sort().forEach((k, i) => {

const separator = i < keys.length - 1 ? ',' : '';

parser.push(`"${k}"..#${this.getLuaFunctionName(`${luaFunctionName}_${k}`)}#${separator}`);

});

}

}

parser.push(`${printingArgs ? '' : '}'})`);

functions[luaFunctionName] = parser.join('');

}

private getLuaFunctionName(functionName: string): string {

return functionName.replace(/-/g, '_');

}

private getCommandsInfo(): any {

const commandsInfo: any = {};

const commands: CommandInfo[] = cli.commands;

commands.forEach(c => {

Autocomplete.processCommand(c.name, c, commandsInfo);

if (c.aliases) {

c.aliases.forEach(a => Autocomplete.processCommand(a, c, commandsInfo));

}

});

return commandsInfo;

}

private static processCommand(commandName: string, commandInfo: CommandInfo, autocomplete: any): void {

const chunks: string[] = commandName.split(' ');

let parent: any = autocomplete;

for (let i: number = 0; i < chunks.length; i++) {

const current: any = chunks[i];

if (!parent[current]) {

if (i < chunks.length - 1) {

parent[current] = {};

}

else {

// last chunk, add options

const optionsArr: string[] = commandInfo.options

.map(o => o.short)

.concat(commandInfo.options.map(o => o.long))

.filter(o => o)

.map(o => (o as string).length === 1 ? `-${o}` : `--${o}`);

optionsArr.push('--help');

optionsArr.push('-h');

const optionsObj: any = {};

optionsArr.forEach(o => {

const optionName: string = o.replace(/^-+/, '');

const option: CommandOptionInfo = commandInfo.options.filter(opt => opt.long === optionName || opt.short === optionName)[0];

if (option && option.autocomplete) {

optionsObj[o] = option.autocomplete;

}

else {

optionsObj[o] = {};

}

});

parent[current] = optionsObj;

}

}

parent = parent[current];

}

}

}

export const autocomplete = new Autocomplete();