Not sure I follow what you mean by "one yield per function". The following
works, if that's what you mean:
var suspend = require('./'),
fs = require('fs');
suspend(function* (resume) {
// read the current file
var res = yield fs.readFile(__filename, { encoding: 'utf8' },
resume);
// replace tabs with spaces
var newContents = res[1].replace(/\t/g, ' ');
// write back changes
yield fs.writeFile(__filename, newContents, resume);
// print modified file
var modified = yield fs.readFile(__filename, { encoding: 'utf8'},
resume);
console.log(modified[1]);
})();
This performs 3 asynchronous operations within the same generator. Nothing
prohibits nesting, either (again, not entirely sure what you mean, but the
following works as well):
var suspend = require('./'),
fs = require('fs');
var readCurrentFile = suspend(function* (resume, cb) {
var res = yield fs.readFile(__filename, { encoding: 'utf8'},
resume);
cb(null, res[1]);
});
var writeToCurrentFile = suspend(function* (resume, data, cb) {
yield fs.writeFile(__filename, data, resume);
cb(null);
});
suspend(function* (resume) {
var res = yield readCurrentFile(resume);
var newContents = res[1].replace(/\t/g, ' ');
yield writeToCurrentFile(newContents, resume);
var modified = yield readCurrentFile(resume);
console.log(modified[1]);
})();
Congrats on getting galaxy out, looking it over now! Curious about the
fanciness you had to include in the `run` function.
On Fri, May 31, 2013 at 2:56 AM, Bruno Jouhier <[email protected]> wrote:
> Look like your start function only handles one yield per function. What if
> you want to make several async calls from the same function? How do you
> handle several levels of async calls (async f1 calling async f2 calling
> async f3)?
>
> I just published a module that handles these cases (
> https://github.com/bjouhier/galaxy) but I had to use a much trickier
> `run` function for this.
>
> Bruno
>
>
> On Tuesday, May 28, 2013 4:20:06 PM UTC+2, jmar777 wrote:
>>
>> *suspend* <https://github.com/jmar777/suspend> is a new control flow
>> library that exposes a minimal API around* ES6 generators*, and is
>> expressly designed to work transparently with Node's existing callback
>> conventions. This allows unobtrusive use of *yield* execution semantics
>> that works seamlessly with existing Node code bases (no need to wrap
>> everything in a promises/whatever layer).
>>
>> *Quick example:*
>> *
>> *
>> var suspend = require('suspend'),
>> fs = require('fs');
>>
>> suspend(function* (resume) {
>> var data = yield fs.readFile(__filename, resume);
>> console.log(data[1].toString('**utf8'));
>> })();
>>
>> *Links:* GitHub Repo <https://github.com/jmar777/suspend> | Blog
>> Announcement<http://devsmash.com/blog/suspend-generator-based-control-flow-for-node>
>>
>> *NPM: *$ npm install suspend
>>
>> *suspend* is extremely experimental, and I would greatly appreciate any
>> feedback!
>>
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--
Jeremy Martin
661.312.3853
http://devsmash.com
@jmar777
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