我已经创建了以下插件，就像之前的许多插件一样......
/**
* This plugin automatically generates a version number based on the configured
* minor version and today's date and time.
*/
object DateVersionPlugin extends AutoPlugin {
//override def trigger = allRequirements
def dateFormat (fmt : String) =
new java.text.SimpleDateFormat(fmt).format(
new java.util.Date()
)
def versionNumber (majorVersion : String,
versionTrimFront : Int,
versionDateFormat : String) =
"%s.%s".format(
majorVersion, dateFormat(versionDateFormat).substring(versionTrimFront)
)
/**
* Defines all settings/tasks that get automatically imported,
* when the plugin is enabled
*/
object autoImport {
/**
* The number of values to trim off the front of the date string.
*
* This is used to achieve a date string which doesn't include the
* present millenium. The century, a stretch, can be imagined as
* conceivable - but few civilizations have lasted multiple millennia.
*/
lazy val versionTrimFront = settingKey[Int]("Number of characters to remove from front of date")
/**
* The format to use for generating the date-part of this version number.
*/
lazy val versionDateFormat = settingKey[String]("The date format to use for versions")
/**
* The major version to place at the front of the version number.
*/
lazy val versionMajor = settingKey[String]("The major version number, default 0")
/**
* The filename of the generated resource.
*/
lazy val versionFilename = settingKey[String]("The filename of the file to generate")
/**
* The name of the property to place in the version number.
*/
lazy val versionPropertyName = settingKey[String]("The name of the property to store as version")
/**
* Generate a version.conf configuration file.
*
* This task generates a configuration file of the name specified in the
* settings key.
*/
lazy val generateVersionConf = taskKey[Seq[File]]("Generates a version.conf file.")
}
import autoImport._
/**
* Provide default settings
*/
override def projectSettings: Seq[Setting[_]] = Seq(
versionFilename := "version.conf",
versionPropertyName := "version",
versionDateFormat := "YY.D.HHmmss",
versionTrimFront := 0,
versionMajor := "0",
(version in Global) := versionNumber(versionMajor.value,
versionTrimFront.value, versionDateFormat.value),
generateVersionConf <<=
(resourceManaged in Compile, version, versionFilename, versionPropertyName, streams) map {
(dir, v, filename, propertyName, s) =>
val file = dir / filename
val contents = propertyName + " = \"" + v.split("-").head + "\""
s.log.info("Writing " + contents + " to " + file)
IO.write(file, contents)
Seq(file)
},
resourceGenerators in Compile += generateVersionConf.taskValue
)
}
该generate-version-conf任务按预期运行，生成我正在寻找的文件。使用此插件的version项目按预期更新设置。但是以下情况没有发生，我不清楚为什么：
- 配置文件不是由
compile. - 配置文件不是由 .jar 打包在 jar 中的
package。 - 使用任务时配置文件不在类路径中
run。
请注意，我还尝试了十几种变体，并且我进一步尝试了：
resourceGenerators in Compile <+= generateVersionConf
据我了解，这应该会导致或多或少相同的行为。
检查它的运行时属性，我看到一些设置已成功应用：
> inspect version
[info] Setting: java.lang.String = 0.15.338.160117
[info] Description:
[info] The version/revision of the current module.
[info] Provided by:
[info] */*:version
[info] Defined at:
[info] (com.quantcast.sbt.version.DateVersionPlugin) DateVersionPlugin.scala:101
[info] Reverse dependencies:
[info] *:isSnapshot
[info] *:generateVersionConf
[info] *:projectId
[info] Delegates:
[info] *:version
[info] {.}/*:version
[info] */*:version
[info] Related:
[info] */*:version
但是，对于 来说，情况并非如此compile:resourceGenerators，这表明它仍然保持默认值。
> inspect compile:resourceGenerators
[info] Setting: scala.collection.Seq[sbt.Task[scala.collection.Seq[java.io.File]]] = List(Task(_))
[info] Description:
[info] List of tasks that generate resources.
[info] Provided by:
[info] {file:/home/scott/code/quantcast/play/sbt-date-version/sbt-test/}root/compile:resourceGenerators
[info] Defined at:
[info] (sbt.Defaults) Defaults.scala:207
[info] (sbt.Defaults) Defaults.scala:208
[info] Dependencies:
[info] compile:discoveredSbtPlugins
[info] compile:resourceManaged
[info] Reverse dependencies:
[info] compile:managedResources
[info] Delegates:
[info] compile:resourceGenerators
[info] *:resourceGenerators
[info] {.}/compile:resourceGenerators
[info] {.}/*:resourceGenerators
[info] */compile:resourceGenerators
[info] */*:resourceGenerators
[info] Related:
[info] test:resourceGenerators
我的问题是（现在我已经继续对此进行更多研究），是什么阻止了我对（generateResources in Compile）的更改被应用？