pacutils.js

module.exports = {}
const mex = module.exports;

const cl        = console.log;
mex.cl          = cl;

mex._rl         = require('readline');
mex._os         = require('os');
mex._path       = require('path');
mex._fs         = require('fs');
mex._async      = require("async");
mex._cp         = require('child_process');
mex._crypto     = require('crypto');
mex._promisify  = require('util').promisify;

mex._arg        = process.argv.splice(2);
mex._cmd        = mex._arg.shift();
mex._opt        = [];

mex.ce = function(...args){
  args.map(function(e,i){args[i] = mex.style(e.trim(),'fgr')})
  console.error(...args);
}

mex.doargs = function(){
  var dels=[];
  mex._arg.map(function(arg,idx){
    if((/^-+/).test(arg)) {
      mex._opt.push(arg.replace(/^-+/,''));
      dels.push(idx);
    };
  })
  dels.reverse().map(function(idx){
    mex._arg.splice(idx,1)
  })
}


mex.exit = process.exit;
mex.quit = function(msg='Quit.'){
  if(msg) mex.cl(mex.style(msg,'fgr'));
  mex.exit();
}

// styling the console output.
mex.style = function(str,sty,noclr){
  var cols={res: "\x1b[0m",bright : "\x1b[1m",dim : "\x1b[2m",ul : "\x1b[4m",blink : "\x1b[5m",rev : "\x1b[7m",hide : "\x1b[8m",fgk : "\x1b[30m",fgr : "\x1b[31m",fgg : "\x1b[32m",fgy : "\x1b[33m",fgb : "\x1b[34m",fgv : "\x1b[35m",fgc : "\x1b[36m",fgw : "\x1b[37m",bgk : "\x1b[40m",bgr : "\x1b[41m",bgg : "\x1b[42m",bgy : "\x1b[43m",bgb : "\x1b[44m",bgv : "\x1b[45m",bgc : "\x1b[46m",bgw : "\x1b[47m"};
  
  if(typeof sty =='string') sty=[sty];
  sty.map(function(e){str = cols[e]+str;})
  if(!noclr) str += cols['res'];
  return str;
}

mex.h1 = function(txt,len=10){
  const tlen = txt.length;
  cl();
  cl(mex.style(mex.rpad(mex.lpad(` ${txt} `,tlen+len,'-'),tlen+len*2,'-'),'bgb'))  
}

mex.h2 = function(txt){cl(mex.style(`\n${txt}`,['fgc','ul']))}

mex.list = function(list,sty){
  if(!Array.isArray(list)) return oblist(list,sty);
  list.map(function(row,i){
    if(!row) return;
    var line = `${mex.lpad(i+1)}. ${row}`
    if(sty) cl(mex.style(line,sty));
    else cl(line);   
  })  
}

// return true if valid.
mex.listval = function(list,idx){
  var data = {vals:idx, error:false};
  if(idx=='*') data.vals = list.map(function(e,i){return i+1});
  else if((/^$|^x$|^q$/).test(idx)) data.error = true;
  else if (!isNaN(idx)){
    if(idx > list.length || idx < 1) data.error=true;
  }
  else data.vals = idx.toString().split(/, |,/);
  if(data.vals.length > list.length) data.error = true;
  if(!Array.isArray(data.vals)) data.vals = [data.vals];
  data.vals.map(function(e,i){data.vals[i]--});
  if(data.error) data.vals = [];
  return data;
}

mex.test = function(){
  cl(mex.listval(["a","b","c","d"],mex._arg[0]))
}

mex.oblist = function (obj,sty){
  var i =1;
  for(var k in obj){
    cl(`${mex.lpad(i,2)} ${mex.lpad(k,6)} : ${JSON.stringify(obj[k]).replace(/"/g,'')}`);
    i++;    
  }  
}

mex.rpad = function(data,len=2,chr=' '){
  return data.toString().padEnd(len,chr)
}

mex.lpad = function(data,len=2,chr=' '){
  return data.toString().padStart(len,chr)
}

mex.pad = mex.lpad;

mex.newrl = function(){
  return mex._rl.createInterface({input: process.stdin,output: process.stdout}); 
}

mex.isopt = function(opt){
  return (mex._opt.indexOf(opt)>-1)
}

mex.isarg = function(opt){
  return (mex._arg.indexOf(opt)>-1)
}

mex.str2bool = function(str){
  return str.toString()=='true'; 
}

mex.str2array = function(str){
  if(!Array.isArray(str)) return str.split(/,\s*|\s/);
  return str;
}

mex.funcargs = function(fn){
  return fn.toString()
  .replace(/((\/\/.*$)|(\/\*[\s\S]*?\*\/)|(\s))/mg,'')
  .match(/^function\s*[^\(]*\(\s*([^\)]*)\)/m)[1]
  .split(/,/);
}

mex.prompt = function(msg,cb,def){
  var rl = mex.newrl();
  rl.question(mex.style(`${msg} > `,'fgw'),function(res){
    setTimeout(function(){cb(res)}); 
    rl.close()  
  });
  if(def) rl.write(def);
}

mex.jsparse = function(str){
  try{return JSON.parse(str)}
  catch(e){return({error:true,msg:e.message})}  
}

mex.jsstring = function(obj){
  try{return JSON.stringify(obj)}
  catch(e){return({error:true,msg:e.message})}  
}

mex.exec = function(dir,cmd,cb,opts){
	//opts { maxBuffer: 10 * 1024 * 1024 * 1024};
	opts=opts||{};
	process.chdir(dir);
	if((/^git/).test(cmd) && mex.isopt('test')) cmd = cmd.replace(/^git/g,'git --dry-run');
	mex._cp.exec(cmd,opts,function (error, stdout, stderr) {
		if(typeof(cb)=="function") {
			if(error){ return cb({error:true,'err':error.message,'std':stderr,'msg':stderr});}
			else return cb(stdout);
		} else return null;
	});
};

mex.help = function(mod=mex,cb=cl){
  for(var k in mod){
    if(typeof mod[k]=='function') cl(`pacutils ${k} [${mex.funcargs(mod[k]).join('|')}]`);
  }
}

/* COMMAND-LINE RUN */
if(!module.parent){
  mex.doargs();
  // _arg are variables, _opt are control options.
  cl(mex._cmd);
  if(mex._cmd) mex[mex._cmd](...mex._arg);
}