Difference between "const" and "define()": http://stackoverflow.com/a/3193704/246724
- define(): Run-time constant.
- const: Compile-time constant. Declaration cannot use dynamic expressions.

There is a number of places in Drupal where we define DRUPAL_ROOT. bootstrap.inc, scripts, tests.

Proposal:

  • Have a separate file for define() stuff, esp. DRUPAL_ROOT.
  • Include this file from autoload.php (by mentioning it in composer.json).
  • Constants defined with "const" can either move to this file or be turned into class constants like Drupal::MINIMUM_PHP.
  • const and define() in modules are out of scope for this issue.

This will open the door for other changes in future issues:

  • Scripts (core/scripts/*) can include autoload.php and no longer need to define DRUPAL_ROOT.
  • Scripts logic can be moved to classes, e.g. in Drupal\Core\Scripts\..
    This might not work for all scripts, but some or most of them.
  • There can be shared logic for dealing with script arguments and options, similar to drush.
    This logic could even come from a 3rd party, e.g. Aura.Cli

I came across this while working on the switch-psr4.sh script in #2083547: PSR-4: Putting it all together.
Thoughts?

Comments

donquixote’s picture

donquixote CreditAttribution: donquixote commented
Issue summary: View changes

Changes to issue summary:
- Cmd logic could come from a 3rd party, e.g. Aura.Cli.
- const and define() in modules are out of scope for this issue.

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joachim’s picture

joachim CreditAttribution: joachim as a volunteer commented

Possibly a duplicate of #1792310: Wrong DRUPAL_ROOT with non-standard code structure?

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