Exec

Bash like command piping and redirecting for Dart to make writing Dart scripts easier.

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From the authors of Jaguar.dart.

Usage

Execute a command

await exec('rm', ['example/dest.csv']).run();

Access command output

final String out = await exec('cat', ['example/names.csv']).runGetOutput();
print(out);

or

await exec('cat', ['example/names.csv']).runGetOutput(onFinish: print);

Pipe

await exec('cat', ['example/names.csv'])
  .pipe(exec('cut', ['-d', "','", '-f', '1']))
  .runGetOutput(onFinish: print);

Output redirection

await (exec('cat', ['example/names.csv']) |
          exec('cut', ['-d', "','", '-f', '1']) >
      new Uri(path: 'example/dest.csv'))
  .run();

Input redirection

await (exec('cut', ['-d', "','", '-f', '1']) <
      '''
John,Smith,34,London
Arthur,Evans,21,Newport
George,Jones,32,Truro
      ''')
  .runGetOutput(onFinish: print);

Inline functions

await exec('cat', ['example/names.csv'])
  .pipeInlineLine(
      (Stream<String> stream) => stream.map((s) => s.split(',')[1]))
  .runGetOutput(onFinish: print);

TODO

• Catch and report error in sub-commands
• Support other encoders
• Support stderr redirection
• Test multiple redirections
• Support &, | and ~ concepts