flutter-gradle-plugin/src/main/groovy/com/fahrecker/gradle/FlutterGradlePlugin.groovy

package com.fahrecker.gradle

import org.gradle.api.Plugin
import org.gradle.api.Project

class FlutterGradlePlugin implements Plugin<Project> {
    void apply(Project project) {
        FlutterExtension extension = project.extensions.create("flutter", FlutterExtension, project)
        
        project.task("flutterDoctor") {
            doLast {
                project.exec {
                    commandLine flutterCommand("doctor")
                }
            }
        }

        project.task("flutterVersion") {
            doLast {
                project.exec {
                    commandLine flutterCommand("--version")
                }
            }
        }

        project.task("flutterBuildApk") {
            doLast {
                project.exec {
                    commandLine flutterCommand("build", "apk")
                }
            }
        }
    }

    List<String> flutterCommand(String... args) {
        if (System.getProperty('os.name').toLowerCase().contains('windows')) {
            return ['cmd', '/c', 'flutter'] + args
        } else {
            return ['flutter'] + args
        }
    }
}

class FlutterExtension {
    final Property<String> flutterVersion
    final Property<String> flutterChannel
    final Property<String> flutterSdkPath

    FlutterExtension(Project project) {
        flutterVersion = project.objects.property(String)
        flutterChannel = project.objects.property(String)
        flutterSdkPath = project.objects.property(String)
    }

    void setFlutterVersion(String version) {
        flutterVersion.set(version)
    }

    void setFlutterChannel(String channel) {
        flutterChannel.set(channel)
    }

    void setFlutterSdkPath(String path) {
        flutterSdkPath.set(path)
    }
}