find-collisions.js

// First do this:
// $ curl http://isaacs.iriscouch.com/registry/_all_docs > npmdocs.json

var docs = require("./npmdocs").rows;

var request = require("request");
var fs = require("fs");

var normalized = {};
docs.forEach(function(doc) {
	var lower = doc.id.toLowerCase();

	(normalized[lower] || (normalized[lower] = [])).push(doc.id);
});

var collisions = [];
for(var key in normalized) {
	if(normalized[key].length > 1) {
		collisions.push(normalized[key]);
	}
}

fs.writeFile("./collisions.json", prettyJson(collisions), function(err) {
	if(err) { throw err; }

	console.log("Wrote collisions.json");
});

var results = [], pendingCols = collisions.length;
collisions.forEach(function(modules) {
	var pendingMods = modules.length, modAuthors = [];

	modules.forEach(function(module) {
		request(
			"http://isaacs.iriscouch.com/registry/" + module,
			function(err, res, body) {
				if(err) { throw err; }

				body = JSON.parse(body);
				modAuthors.push({
					module: module,
					author: body.author || body.maintainers[0]
				});

				pendingMods -= 1;
				if(pendingMods <= 0) {
					results.push(modAuthors);

					pendingCols -= 1;
					if(pendingCols <= 0) { separateCols(results); }
				}
			}
		);
	});
});

function prettyJson(obj) {
	return JSON.stringify(obj, null, "\t");
}

function separateCols(collisions) {
	var pseudoCols = [], realCols = [];

	collisions.forEach(function(modules) {
		var author = modules[0].author;
		var haveSameAuthor = modules.every(function(mod) {
			return (author.email && author.email === mod.author.email) ||
				(author.name && author.name === mod.author.name);
		});

		if(haveSameAuthor) { pseudoCols.push(modules); }
		else { realCols.push(modules); }
	});

	fs.writeFile("./real-collisions.json", prettyJson(realCols), function(err) {
		if(err) { throw err; }

		console.log("Wrote real-collisions.json");
	});
	fs.writeFile("./pseudo-collisions.json", prettyJson(pseudoCols), function(err) {
		if(err) { throw err; }

		console.log("Wrote pseudo-collisions.json");
	});
}