Add request decomposition with directories

[bookmoons]

Adds command line option --separate/-s which generates a separate file per request.

Generated files define the request through the shim. The main logic then invokes requests by name.

Files are generated into a directory structure matching the tree defined in the Postman collection. File and folder name collisions are suffixed alphabetically, A B etc.

Closes #24.

[bookmoons]

The box example puts this to good use.

node bin/postman-to-k6.js example/v2/box.json -s

export default function() {
  group("Collaborations", function() {
    postman[Request]("Get Pending Collaborations");
    postman[Request]("Retrieve a Collaboration");
    postman[Request]("Retrieve all Collaborations");
    postman[Request]("Add a Collaboration");
    postman[Request]("Edit a Collaboration");
    postman[Request]("Remove a Collaboration");
  });
  group("Comments", function() {
    postman[Request]("Get Information About a Comment");
    postman[Request]("Add a Comment to a File");
    postman[Request]("Add an '@' Comment to a File");
    postman[Request]("Add an Reply Comment to a File");
    postman[Request]("Change a Comment's Message");
    postman[Request]("Delete a Comment");
  });
  group("Events", function() {
    postman[Request]("Get Events for a User");
    postman[Request]("Get a Specific Event in an Enterprise");
    postman[Request]("Get Events in an Enterprise");
  });
  group("Files", function() {
    postman[Request]("Download a File");
    postman[Request]("Get Information about a File");
    postman[Request]("View the Comments on a File");
    postman[Request]("Get a Thumbnail for a File");
..

[robingustafsson]

Apologies for the delay. Looking at this now. Running the box example from above I get:

Could not create request file Collaborations
{ Error: EISDIR: illegal operation on a directory, open './requests/Collaborations'
    at Object.openSync (fs.js:436:3)
    at Object.writeFileSync (fs.js:1168:35)
    at outputRequests (/<path>/postman-to-k6/bin/requests.js:11:10)
    at Command.run (/<path>/postman-to-k6/bin/postman-to-k6.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:68:7)
    at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
    at startup (internal/bootstrap/node.js:279:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:752:3)
  errno: -21,
  syscall: 'open',
  code: 'EISDIR',
  path: './requests/Collaborations' }

Also, I think the filenames should be filtered a bit. The box example produces filenames like Get the Current User's Information.js and Get Access & Refresh Token.js. I propose we at least filter out characters not matching Unicode's "Letters" and "Numbers" category, or at least replace those other characters with a hyphen.

[bookmoons]

Strange. I'll put it on my list to look into this. Thanks for looking it over.

[bookmoons]

Think I've got this error fixed, and implemented that filename encoding.

Did the encoding like this:

• Strip everything except A-Za-z0-9 .-
• Replace consecutive space sequences with a single -

[robingustafsson]

@bookmoons Thanks, works and LGTM, merging.