Dart splits long stdout data into two ProcessResult events - process

Question

When listening to a long string output from a shell process, I receive the data in two chunks. How can I get the entire text?
Here is the code in question:
int i = 0;
Process.start('perl', ['print_text.pl']).then((Process p) {
p.stdout.transform(UTF8.decoder).listen((data) => print("${i++} ${data}"));
p.stdin.writeln('print');
});
The result from running this code is:
0 text.....
1 text.....
I've reported this issue as a bug here. You can run the sample app attached to the report to see the issue.

Answer 1

Try using UTF8.decodeStream().
import 'dart:io';
import 'dart:convert' show UTF8;
main() {
Process.start('ls', ['-la'])
.then((p) => UTF8.decodeStream(p.stdout))
.then((s) => print('Output:\n$s'));
}

Answer 2

I solved this problem by doing the following:
In the shell script, tag the start and the end of the shell's output with a random number.
In Dart, concatenate all the chunks together and use the tags to check if you got the complete result.
This solution does not require exiting the process to obtain the process result.
This is a sample code:
String text = '';
process.stdout.transform(UTF8.decoder).listen((String chunk) {
text = text + chunk;
if (text.substring(errors.length - 1) == text.substring(0, 1)) {
text = text.replaceFirst(new RegExp(r'^(\d+)'), '').replaceFirst(new RegExp(r'(\d+)$'), '');
// use process result then clear text value for subsequent process results
text = '';
}
});

Answer 3

It's not clear what the actual question is but I assume this is what you are looking for:
import 'dart:io';
import 'dart:convert' show UTF8;
void main() {
int i = 0;
String text = '';
Process.start('perl', ['analyze.pl']).then((p) {
p.stdout.transform(UTF8.decoder).listen((data) =>
text += data);
p.exitCode.then((_) => print(text));
});
}