Creating "gem install" commands from a given "gem list" output

#ruby

#gem

#tools

#command

#!/usr/bin/node

var sys = require('sys')
var exec = require('child_process').exec;
var child;

function getGemInfo(stdout){
 var lines = stdout.split("\n");
 var line, version, name, d, gem;
 for(var i in lines){
 line = lines[i];
 if(line){
 gem = {};
 d = line.indexOf("(");
 gem.name = line.substring(0,d).replace(" ","").replace("\n","");
 gem.versions = getVersions(line.substring(d+1).replace(")",""))
 console.log(createGemCommand(gem));
 }
 }
}

function getVersions(part){
 var versions = part.split(",");
 for(var i in versions){
 versions[i] = versions[i].replace(" ","").replace("\n","");
 }
 return versions;
}

function createGemCommand(gem){
 var base = "gem install";
 var out = "";
 for(var i in gem.versions){
 out += base+" "+gem.name+" -v="+gem.versions[i]+"\n";
 }
 return out;
}

child = exec("gem list", function (error, stdout, stderr) {
 if (error !== null) {
 console.log('exec error: ' + error);
 } else {
 getGemInfo(stdout);
 }
});