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New in Symfony 4.1: Console improvements

The main new feature of the Console component in Symfony 4.1 is the advanced output control that lets you update different parts of the output simultaneously. However, we improved the the Console with other minor changes too.

Automatically run the suggested command

Contributed by
Pierre du Plessis
in #25732.

In Symfony, when you mistype the command name you see an error message with a list of similarly named commands. In Symfony 4.1, when there's only one alternative command, you get the option to run it right away:

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$ ./bin/console app:user:impot

  Command "app:user:impot" not defined.
  Do you want to run "app:user:import" instead? [y/n]

New table styles

Contributed by
Dany Maillard
in #25301 and #26693.

In Symfony 4.1, tables displayed as part of the command output can select two new styles called box and box-double:

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$table->setStyle('box');
$table->render();
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┌───────────────┬──────────────────────────┬──────────────────┐
│ ISBN          │ Title                    │ Author           │
├───────────────┼──────────────────────────┼──────────────────┤
│ 99921-58-10-7 │ Divine Comedy            │ Dante Alighieri  │
│ 9971-5-0210-0 │ A Tale of Two Cities     │ Charles Dickens  │
│ 960-425-059-0 │ The Lord of the Rings    │ J. R. R. Tolkien │
│ 80-902734-1-6 │ And Then There Were None │ Agatha Christie  │
└───────────────┴──────────────────────────┴──────────────────┘
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$table->setStyle('box-double');
$table->render();
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╔═══════════════╤══════════════════════════╤══════════════════╗
║ ISBN          │ Title                    │ Author           ║
╠═══════════════╪══════════════════════════╪══════════════════╣
║ 99921-58-10-7 │ Divine Comedy            │ Dante Alighieri  ║
║ 9971-5-0210-0 │ A Tale of Two Cities     │ Charles Dickens  ║
║ 960-425-059-0 │ The Lord of the Rings    │ J. R. R. Tolkien ║
║ 80-902734-1-6 │ And Then There Were None │ Agatha Christie  ║
╚═══════════════╧══════════════════════════╧══════════════════╝

New methods to customize tables

Contributed by
Dany Maillard
in #25456.

In addition to the new table styles, in Symfony 4.1 we've deprecated some methods (setHorizontalBorderChar(), setVerticalBorderChar(), setCrossingChar()) to introduce more powerful methods that will allow you to customize every single character used to draw the table borders.

For example, the new setCrossingChars() can customize 9 different characters:

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public function setCrossingChars(
    string $cross, string $topLeft, string $topMid, string $topRight,
    string $midRight, string $bottomRight, string $bottomMid,
    string $bottomLeft, string $midLeft
);

// * 1---------------2-----------------------2------------------3
// | ISBN          | Title                 | Author           |
// 8---------------0-----------------------0------------------4
// | 99921-58-10-7 | Divine Comedy         | Dante Alighieri  |
// | 9971-5-0210-0 | A Tale of Two Cities  | Charles Dickens  |
// | 960-425-059-0 | The Lord of the Rings | J. R. R. Tolkien |
// 7---------------6-----------------------6------------------5

// @param string $cross       Crossing char (see #0 of example)
// @param string $topLeft     Top left char (see #1 of example)
// @param string $topMid      Top mid char (see #2 of example)
// @param string $topRight    Top right char (see #3 of example)
// @param string $midRight    Mid right char (see #4 of example)
// @param string $bottomRight Bottom right char (see #5 of example)
// @param string $bottomMid   Bottom mid char (see #6 of example)
// @param string $bottomLeft  Bottom left char (see #7 of example)
// @param string $midLeft     Mid left char (see #8 of example)

Added support for outputting iterators

In Symfony 4.1, the write() and writeln() methods of the Console output (including SymfonyStyle output too) support passing iterators that return strings:

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private function generateMessages(): iterable
{
    yield 'foo';
    yield 'bar';
}

// ...
$output->writeln($this->generateMessages());
// Output will be:
// foo\n
// bar\n

Comments

Nice feature for command suggestion. Why not extending this to the most approaching command when there is many suggested commands?
Love it!
Me too!

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