New in Symfony 6.2: Console improvements

The Console component is the most downloaded non-polyfill component (+530 million
downloads as of November 2022) and the component with most dependents overall
(nearly 10,000 public projects depend on it). In Symfony 6.2 we added some nice
new features to it.

Show Commands When Running Namespace

Contributed by
Wouter de Jong

in #47750.

When running only the namespace instead of the full command name, Symfony
displays an error message:

$ bin/console debug

Command „debug“ is not defined. Did you mean one of these?

In Symfony 6.2 we’re improving this to list instead all the commands defined
under the given namespace:

$ bin/console debug
Symfony 6.2.0 (env: dev, debug: true) #StandWithUkraine

command [options] [arguments]


Available commands for the „debug“ namespace:
debug:autowiring List classes/interfaces you can use for autowiring
debug:config Dump the current configuration for an extension
debug:container Display current services for an application
debug:dotenv Lists all dotenv files with variables and values
debug:event-dispatcher Display configured listeners for an application
debug:router Display current routes for an application

Resuming Progress Bars

Contributed by
Ivan Yivoff

in #46242.

Symfony 6.2 adds the option to resume a progress bar so it doesn’t always start
from 0. This is useful not only to resume long standing tasks but also to
show the progress of a complex task with optional steps that can be skipped:

use SymfonyComponentConsoleHelperProgressBar;

// create a new progress bar (length = 100 units)
$progressBar = new ProgressBar($output, 100);

// pass the new optional second argument to display the progress bar
// starting at some point different from 0 (in this example = 25)
$progressBar->start(null, 25);

Improved Color Support

Contributed by
Boudry Julien

in #46944
and #47407.

In Symfony 5.2 we introduced true colors in the console to support Ansi24
(24-bit colors) mode. In Symfony 6.2 we’re improving color support by adding a
new Ansi8 (256-color) mode for terminals that don’t support true colors.

The best of all is that you don’t have to change anything in your code. You can
still use 24-bit colors and Symfony will transform them to the nearest 8-bit
colors if the terminal doesn’t support them (e.g. #c0392b (24-bit) is degraded
to #d75f5f in 8-bit color terminals and to red in 4-bit color terminals).

Lastly, we’ve introduced a setColorMode(?AnsiColorMode $colorMode) method
in the main Terminal class so you can force a color mode in the terminal
(it overrides any env var defining the color mode).

Zsh Shell Autocompletion

Contributed by
and Jérôme Tamarelle

in #47018.

In Symfony 5.4 we introduced console autocompletion so you can press the TAB
key to see a list of contextual suggestions for commands, arguments, options, etc.
Initially it only worked on Bash shells, but in Symfony 6.2 we’re also adding
support for Zsh shell autocompletion.

Limiting the Height of Console Sections

Contributed by
Wouter de Jong

in #47308.

Console introduced output sections in Symfony 4.1. They allow to define
different output regions that you can manage independently. In Symfony 6.2 we’re
adding a feature to limit the height of any section:

class MyCommand extends Command
// …

protected function execute(InputInterface $input, OutputInterface $output): int
// …
$debugMessages = $output->section();

// …

When the contents overflow the given number of rows, the new contents replace
the existing contents. This is very useful to show verbose output in long
running processes, without taking over the complete terminal buffer:

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