Question

我有一些用groovy编写的Git助手：

git.gradle：

def gitHash() {
    def res = 'git rev-parse --short HEAD'.execute([], project.rootDir).text.trim()

    def diff = 'git diff'.execute([], project.rootDir).text.trim()
    if (diff != null && diff.length() > 0) {
        res += "-dirty"
    }

    return res
}

// method needs to be converted to closure, in order to be visible outside of script
ext.gitHash =  { return gitHash();}

现在我将整个东西转换成Kotlin，现在看起来像这样：

git.gradle.kts：

import java.io.IOException
import java.util.concurrent.TimeUnit

fun gitHash() : String {
    var res = "git rev-parse --short HEAD".runCommand(project.rootDir)?.trim()

    val diff = "git diff".runCommand(project.rootDir)?.trim()
    if (diff != null && diff.isNotEmpty()) {
        res += "-dirty"
    }
    return res!!
}

fun String.runCommand(workingDir: File): String? {
    ...
}

// method needs to be converted to closure, in order to be visible outside of script
//ext.gitHash =  { return gitHash();} // <-- HERE'S THE PROBLEM

task("gitTask") { // <-- calling ./gradlew gitTask works
    println(gitHash())
}

主要脚本包括以下内容：

//apply from: 'git.gradle'
apply from: 'git.gradle.kts'

println gitHash() // works with Groovy, doesn't with Kotlin

现在问题是，主脚本无法识别gitHash（）方法，很可能是因为我无法通过ext闭包来暴露它。与Groovy脚本相同，此方法似乎是该文件中的私有（或本地）。

据我所知，ext closure是＆project 39的缩写.extra＆＃39;我试图整合。而且，似乎典型的Groovy闭包在Kotlin中没有等效物。我卡在这里，不知道我还能尝试什么。欢迎任何想法。

更新

使用：

var gitHash: Closure<Any?> by extra
gitHash = closureOf<String> { }
gitHash.delegate = { gitHash() }

我能够在Groovy中使用它，如：

println gitHash.invoke()

但它不适用于Kotlin脚本...因为invoke（）指向call（）（https://github.com/gradle/gradle-script-kotlin/blob/master/src/main/kotlin/org/gradle/script/lang/kotlin/GroovyInteroperability.kt扩展方法）。虽然我试图将其用作封闭gitHash()，但却导致了这样的错误：

Parameter specified as non-null is null: method org.gradle.script.lang.kotlin.KotlinClosure.doCall, parameter it

看起来我错过了什么......

Answer 1

如果您仍在寻找解决方案，请参阅我的建议：

import java.io.ByteArrayOutputStream

inline
fun String.runCommand(workingDir: File): String {
    val command = this
    val stdout = ByteArrayOutputStream()
    project.exec {
        this.workingDir = workingDir
        this.commandLine = command.split(" ")
        this.standardOutput = stdout
    }
    return String(stdout.toByteArray()).trim()
}

task("gitHash") {
    var res = "git rev-parse --short HEAD".runCommand(project.rootDir)
    val diff = "git diff".runCommand(project.rootDir)
    if (!diff.isNullOrBlank()) { res += "-dirty" }
    println(res)
}

我已使用Gradle 4.6+

对其进行了测试

..或者也许是更惯用的：

inline
fun String.runCommand(workingDir: File): String {
    val stdout = ByteArrayOutputStream()
    project.exec {
        this.workingDir = workingDir
        this.commandLine = this@runCommand.split(" ")
        this.standardOutput = stdout
    }
    return String(stdout.toByteArray()).trim()
}

val commitHash by lazy { "git rev-parse --short HEAD".runCommand(project.rootDir) }
val workingCopyDiff by lazy { "git diff".runCommand(project.rootDir) }

val gitHash by tasks.creating {
    println(commitHash + if (workingCopyDiff.isBlank()) "" else "-dirty")
}

将Groovy gradle迁移到Kotlin gradle（ext缺失或闭包转换，不确定）

1 个答案: