resolve deps to row.id rather than row.file

[zoubin]

I encountered the problem in browserify/browserify#1260

I think there is something can be done in module-deps to fix that problem. But I am not sure if it's the right way.

The rows generated by module-deps should contain a dependency graph with the key id (identifying a node in the graph), yet row.deps are resolved to absolute file paths, rather than the ids of the corresponding dependent rows, which means we may not find some dependent row from the deps property.

The rows generated by module-deps should contain a dependency graph with the keyid(identifying a node in the graph). I am sorry to bother, if I misunderstand the deps output.

Here is an example (with some twists to https://github.com/substack/module-deps/blob/master/example/deps.js):

var mdeps = require('../');
var JSONStream = require('JSONStream');

var md = mdeps();
md.pipe(JSONStream.stringify()).pipe(process.stdout);
md.write({ file: './files/main.js' });
md.write({ file: './files/foo.js', id: './files/foo.js' }); // foo.js is required in main.js
md.end();

The output is:

[
{"file":"./files/main.js","id":"/Users/zoubin/usr/src/zoubin/module-deps/example/files/main.js","source":"var foo = require('./foo');\nconsole.log('main: ' + foo(5));\n","deps":{"./foo":"/Users/zoubin/usr/src/zoubin/module-deps/example/files/foo.js"},"entry":true}
,
{"id":"/Users/zoubin/usr/src/zoubin/module-deps/example/files/bar.js","source":"module.exports = function (n) {\n    return n * 100;\n};\n","deps":{},"file":"/Users/zoubin/usr/src/zoubin/module-deps/example/files/bar.js"}
,
{"file":"./files/foo.js","id":"./files/foo.js","source":"var bar = require('./bar');\n\nmodule.exports = function (n) {\n    return n * 111 + bar(n);\n};\n","deps":{"./bar":"/Users/zoubin/usr/src/zoubin/module-deps/example/files/bar.js"},"entry":true}
]

The deps of main.js is {"./foo":"/Users/zoubin/usr/src/zoubin/module-deps/example/files/foo.js"}. It is impossible to retrieve the foo.js row from the output rows. And that is why I got an undefined deps in browserify/browserify#1260

[jmm]

@zoubin I haven't looked at your PR in detail yet, but in case you're interested I'm working on some better documentation for how row properties are used throughout the pipeline to try to squash a bunch of these kinds of issues in a coordinated way. Here's what I have right now:
http://jmm.github.io/browserify-pipeline-docs/

[zertosh]

@zoubin I took a quick glance and realized that this is going to require serious thought - Give me a few days to clear up some time for this.