Groovy多行字符串插值空格

通过插值插入字符串时，仅缩进其第一行。插入的字符串的以下各行将以不同的方式缩进，从而弄乱了所有内容。

使用GString（）.strings[]和的一些鲜为人知的成员.values[]，我们可以对齐每个插值的所有行的缩进。

String method2(String tier, String jobName) {
    indented """
        Map downstreamJobs = [:]
        stage ("${jobName}-${tier}-\${region}_${jobName}") {
            test
        }
    """
}

String simpleLog() {
    indented """\
        script {
           def user = env.BUILD_USER_ID
        }
    """
}

String method1() {
    indented """\
        import jenkins.model.Jenkins
        currentBuild.displayName = "name"

        ${simpleLog()}
    """
}

String generateFullDeploymentPipelineCode() {
    indented """\
        Text here
        ${method1()}
        ${method2("test1", "test2")}
    """
}

println generateFullDeploymentPipelineCode()

//---------- Move the following code into its own script ----------

// Function to adjust the indentation of interpolated values so that all lines
// of a value match the indentation of the first line.
// Finally stripIndent() will be called before returning the string.

String indented( GString templ ) {

    // Iterate over the interpolated values of the GString template.
    templ.values.eachWithIndex{ value, i ->

        // Get the string preceding the current value. Always defined, even
        // when the value is at the beginning of the template.
        def beforeValue = templ.strings[ i ]

        // RegEx to match any indent substring before the value.
        // Special case for the first string, which doesn't necessarily contain '\n'. 
        def regexIndent = i == 0
                          ? /(?:^|\n)([ \t]+)$/
                          : /\n([ \t]+)$/

        def matchIndent = ( beforeValue =~ regexIndent )
        if( matchIndent ) {
            def indent = matchIndent[ 0 ][ 1 ]
            def lines = value.readLines()
            def linesNew = [ lines.head() ]  // The 1st line is already indented.
            // Insert the indentation from the 1st line into all subsequent lines.
            linesNew += lines.tail().collect{ indent + it }
            // Finally replace the value with the reformatted lines.
            templ.values[ i ] = linesNew.join('\n')
        }
    }

    return templ.stripIndent()
}

// Fallback in case the input string is not a GString (when it doesn't contain expressions)
String indented( String templ ) {
    return templ.stripIndent()  
}

现场现场演示

输出：

Text here
import jenkins.model.Jenkins
currentBuild.displayName = "name"

script {
   def user = env.BUILD_USER_ID
}

Map downstreamJobs = [:]
stage ("test2-test1-${region}_test2") {
    test
}

结论：

使用该indented功能，GString已经实现了用于从模板生成代码的简洁的Groovy语法。

这是相当的学习经验。我首先尝试使用该evaluate功能完全不同，但结果却过于复杂且不够灵活。然后，我随机浏览了mrhaki博客中的一些文章（总是读得不错！），直到发现“ Groovy Goodness：了解有关GString的更多信息”。这是实施此解决方案的关键。