How recover composer.json by existing project on symfony2?

Question

I have to work on a project on symphony 2 without composer's config, but with folders vendor/* in the repository.

I want to re-install the composer and generate a configuration for an existing package. Is it possible?

Thanks!

Not sure if command for vendor -> composer.json exists. But you can list installed dependencies via `composer show --installed`. — Tomas Votruba, Mar 02 '15 at 15:35
Does this answer your question? [How can I recreate composer.json from the content of the vendor directory?](https://stackoverflow.com/questions/45782095/how-can-i-recreate-composer-json-from-the-content-of-the-vendor-directory) — yivi, Sep 23 '20 at 05:31

score 14 · Accepted Answer · edited Dec 14 '20 at 17:34

You should create bare composer.json by hand or using command composer init.

And then you can list all the packages under the vendor folder by composer show --installed.

Then just generate require section for your composer.json with listed values. And you are done. You can use regular expressions to do it easier.

composer show --installed \
   | awk '{printf "\"%s\": \"^%s\",\n", $1, $2}' \
   | sed -r 's:\^v:^:g' \
   >> packages.list

score -1 · Answer 2 · answered Jan 24 '18 at 12:19

 composer update
 Loading composer repositories with package information
 Updating dependencies (including require-dev)
 Package operations: 0 installs, 1 update, 8 removals       
   - Removing yiisoft/yii2-jui (2.0.7)
   - Removing bower-asset/jquery-ui (1.12.1)
   - Removing phpoffice/phpspreadsheet (1.0.0)
   - Removing psr/simple-cache (1.0.0)
   - Removing guzzlehttp/guzzle (5.0.0)
   - Removing guzzlehttp/ringphp (1.1.0)
   - Removing guzzlehttp/streams (3.0.0)
   - Removing react/promise (v2.5.1)
   - Updating swiftmailer/swiftmailer (v5.4.8 => v5.4.9): Downloading (100%)         
 Writing lock file
 Generating autoload files

I think you can execute composer update, it will show you all packages, and then composer install ... one by one

composer update with remove all installed dependency that is not in the composer.json — jking, Aug 01 '20 at 14:35

How recover composer.json by existing project on symfony2?

2 Answers2