Convert nodebacks to Task

[robotlolita]

Folktale should support converting Node-back style functions to Tasks.

A Nodeback function is a function that accepts a callback in Node-style, for example:

fs.readFile :: (pathname: String, callback: (Error or null, data: Buffer or String or null) => Void) => Void

A conversion function would take that readFile function and generate a new function that instead of taking a callback returns a Task object:

nodebackToTask(fs.readFile) :: (pathname: String) => Task Error (Buffer or String)

Where this goes?

In the data/conversions module, as nodebackToTask.
In the data/task module, as fromNodeback.

Refer to existing data/conversions modules, and the from* functions in data/maybe and data/either to see more or less how this is done.

[rpearce]

@robotlolita I've just stumbled across this, but is this the sort of thing you're looking for? I wrote a little lib the other day for converting functions with callbacks to Tasks to solve a simple problem and was considering expanding upon it. It's also short enough to include here:

'use strict'

const Task = require('data.task')

function taskFromFn(fn, ctx) {
  return function() {
    var args = [].slice.call(arguments)

    return new Task(function(reject, resolve) {
      fn.apply(ctx,
        args.concat(function(err, data) {
          err ? reject(err) : resolve(data)
        })
      )
    })
  }
}

module.exports = taskFromFn

If so, I'd consider learning more about this library and taking a crack at a pull request!

[rpearce]

@robotlolita I've just stumbled across this, but is this the sort of thing you're looking for? I wrote a little lib the other day for converting functions with callbacks to Tasks to solve a simple problem and was considering expanding upon it. It's also short enough to include here:

'use strict'

const Task = require('data.task')

function taskFromFn(fn, ctx) {
  return function() {
    var args = [].slice.call(arguments)

    return new Task(function(reject, resolve) {
      fn.apply(ctx,
        args.concat(function(err, data) {
          err ? reject(err) : resolve(data)
        })
      )
    })
  }
}

module.exports = taskFromFn

If so, I'd consider learning more about this library and taking a crack at a pull request!

[robotlolita]

@rpearce pretty much, yep :)

[robotlolita]

@rpearce pretty much, yep :)

[rpearce]

Cool I'll take a stab next week at this!

…

On Apr 22, 2017, at 12:09, Quil ***@***.***> wrote: @rpearce pretty much, yep :) — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[rpearce]

Cool I'll take a stab next week at this!

…

On Apr 22, 2017, at 12:09, Quil ***@***.***> wrote: @rpearce pretty much, yep :) — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.