Notes

Ejercicio 8

// Required external modules.
fs = require('fs');
path = require('path');

bb = require('bluebird');

os = require('os'); // Needed for the end-of-line constant, in order to be ed54dd822d4ba184e018f67ff52381b744959c77
// system-independent.

// Get a copy of the arguments array.
var argv = process.argv;
// Get the name of this JavaScript file, without the extension.
var scriptName = path.basename(argv[1], ".js");

/*************************************************************************/
/* Auxiliary functions. */
/*************************************************************************/

function contentsToArray(contents) {
// Converts the contents of the file into an array of text lines.
// Returns the array.
return contents.split(os.EOL);
}
function parseArray(contents,pattern) {
// Parse each array slot (i.e., each text line).
for(var i in contents) {
// If such line has the "pattern" as a substring...
// Note that search() returns the position of its argument
// in the string where it is used. If it is not found,
// search() returns -1.
if (contents[i].search(pattern) > -1)
// Prints it to standard output.
console.log("%d: %s", parseInt(i)+1, contents[i]);
}
}
function processFile(data,pattern) {
// Converts the file into an array of text lines and parses it,
// looking for the pattern given in the second argument.
parseArray(contentsToArray(data),pattern);
}

/*************************************************************************/
/* Main programme. */
/*************************************************************************/
// Check whether the needed arguments have been received or not.
if (argv.length<4) {
// If not, print usage instructions and exit.
console.log("Usage: node " + scriptName + " pattern file");
console.log("Print all lines of 'file' that contain" +
" the 'pattern' substring.");
process.exit();
}
function onCauseError(err) { console.log("Please use the name of an existant file!!"); }
function onSuccess(n) {
return function (res){
console.log('n---------------------nDocumento '+argv[n]+', numero de arg '+n+'n---------------------');
processFile(res,argv[2]);
}
}

console.log('Iniciando programa');
var docs = argv.length-3;
console.log('El numero de documentos son '+docs);

var read_promise = bb.promisify(fs.readFile);
for(i = 3; i<argv.length; i++){
read_promise(argv[i], "utf8").then(onSuccess(i), onCauseError);
}


//fs.readFile(argv[3], "utf8", function(err,data){
// if (err) {
// console.log("Please use the name of an existant file!!");
// } else {
// processFile(data,argv[2]);
// }
//})