Convert Drupal pre-composer project to Composer based

convert-drupal-modules-to-composer.sh

#!/bin/bash

### Convert a pre-Composer Drupal project to use Composer for contrib modules. ###
# This script can automate the process of taking a codebase previously managed via
# drush or otherwise non-composer, and add all the modules to the composer.json
# in the docroot, with the current version number. The script will get 
# all modules and version numbers, and pass to composer for an update.

# This statement will be appended on as each module is found. We can add as
# many modules as are found to the statement, so that composer can fire
# one time and add all the modules found.
composer_update_statement="composer require "

# Any folders that contain contributed moduels can be added to this array.
# So, if you need more than the web/modules/contrib, just add the string
# to this array.
folders_to_scan=("web/modules/contrib")
for module_folder in ${folders_to_scan[@]}; do
  # For each folder, we want to find all modules, and inspect the info.yml file to
  # determine the version number. This is then ultimately added to the composer.json file
  # in the docroot.
  for module_name in $(ls ${module_folder}); do
    module_path=${module_folder}/${module_name}
    path_to_info_file_for_module=${module_path}/${module_name}.info.yml
    version_data=$(cat ${path_to_info_file_for_module} | grep version:)
    ## The version data string contains extra characters, we just want to to get the version number for Composer.
    # E.g. version: '8.x-1.23'
    search="8.x"
    initial_version_string=${version_data##*$search}
    # remove the beginning text.
    partial_version_string=${initial_version_string%% *}
    # Remove the ending ' symbol
    partial_version_string_without_quotation=${partial_version_string//\'/}
    # Remove the first found dash and get the version number suitable for composer.
    version_number=${partial_version_string_without_quotation/-/}
    if [ -z "$version_number" ]
    then
        echo "Skipping $module_name, couldn't determine a version number from info.yml..."
    else
        # Append this module to the existing composer update statement.
        composer_update_statement=$composer_update_statement" drupal/$module_name:$version_number"
    fi
  done
done

# At this point, we've built up a composer update statement with all the modules that were found.
# By executing the statement, composer will add all the current modules and versions to composer.
${composer_update_statement}