Add Codecov support (alternative to Coveralls)

[westonruter]

See #152 (comment) from @ocean90:

Well, coveralls works without the src_dir value, but I agree that codecov looks much better.

Maybe provide a flag do decide which service should be used for coverage?

Example Project: https://codecov.io/github/WP-API/WP-API?branch=develop
Example Config: https://github.com/codecov/example-php/blob/master/.travis.yml

[ocean90]

Some relevant lines about the current implementation for Coveralls:

• can_generate_coverage_clover():

  wp-dev-lib/check-diff.sh

  Lines 319 to 328 in f95a6e9

  	function can_generate_coverage_clover {
  	if [ -e .coveralls.yml ] && [ -e composer.json ] && ! grep -sqi 'coverage' <<< "$DEV_LIB_SKIP"; then
  	if min_php_version "5.5.0" && cat composer.json | grep -Eq '"satooshi/php-coveralls"\s*:\s*"dev-master"'; then
  	return 0
  	elif min_php_version "5.3.0" && cat composer.json | grep -Eq '"satooshi/php-coveralls"\s*:\s*"~1.0"'; then
  	return 0
  	fi
  	fi
  	return 1
  	}

  • Checks whether .coveralls.yml and composer.json with satooshi/php-coveralls exists
• coverage_clover():

  wp-dev-lib/check-diff.sh

  Lines 330 to 334 in f95a6e9

  	function coverage_clover {
  	if can_generate_coverage_clover; then
  	echo --coverage-clover build/logs/clover.xml
  	fi
  	}

  • Prints --coverage-clover build/logs/clover.xml if can_generate_coverage_clover() is true
• travis.after_script.sh: https://github.com/xwp/wp-dev-lib/blob/f95a6e9e60fc261af655be929cee637e93149f41/travis.after_script.sh
  • Pushes data to Coveralls

What Codecov needs is the cover.xml file and the push to codecov.io. For GlotPress I've implemented this via https://github.com/GlotPress/GlotPress-WP/blob/develop/.travis.yml#L39-L43 and https://github.com/GlotPress/GlotPress-WP/blob/develop/phpunit.xml.dist#L28-L30.

It looks like can_generate_coverage_clover() can be used for both. Something like the following might work:

check-diff.sh:

# Flag
COVERAGE_SERVICE=${COVERAGE_SERVICE:-coveralls}

function can_generate_coverage_clover {
    if [ "$COVERAGE_SERVICE" == 'coveralls' ] && [ -e .coveralls.yml ] && [ -e composer.json ] && ! grep -sqi 'coverage' <<< "$DEV_LIB_SKIP"; then
        if min_php_version "5.5.0" && cat composer.json | grep -Eq '"satooshi/php-coveralls"\s*:\s*"dev-master"'; then
            return 0
        elif min_php_version "5.3.0" && cat composer.json | grep -Eq '"satooshi/php-coveralls"\s*:\s*"~1.0"'; then
            return 0
        fi
    elif  [ "$COVERAGE_SERVICE" == 'codecov' ] ; then
        return 1
    fi
    return 0
}

travis.after_script.sh:

if can_generate_coverage_clover && [ -s "$TEMP_DIRECTORY/paths-scope-php" ] && [ -n "$PHPUNIT_COVERAGE_DIR" ]; then
    if [ "$COVERAGE_SERVICE" == 'coveralls' ]; then
        cd "$PHPUNIT_COVERAGE_DIR"
        php vendor/bin/coveralls -vvv
        cd - > /dev/null
    elif  [ "$COVERAGE_SERVICE" == 'codecov' ] ; then
        bash <(curl -s https://codecov.io/bash) -f "$PHPUNIT_COVERAGE_DIR/build/logs/clover.xml"
    fi
fi

[ocean90]

generate-markdown-readme needs to be updated as well to show the correct badge.