Bash script to extract the build name and number from `pubspec.yaml` before building your Flutter app

pre-build.sh

#!/bin/bash

set -e

file=$(cat pubspec.yaml)

BUILD_NAME=$(echo $file | sed -ne 's/[^0-9]*\(\([0-9]\.\)\{0,4\}[0-9][^.]\).*/\1/p')

BUILD_NUMBER=$(git rev-list HEAD --count)

echo "Building version ${BUILD_NAME} ${BUILD_NUMBER}"

export BUILD_NAME="$BUILD_NAME"
export BUILD_NUMBER="$BUILD_NUMBER"