SBT 0.13 的任务定义中不接受打印? [英] print not accepted in task definition in SBT 0.13?

问题描述

我使用的是 SBT 0.13.1.

I'm using SBT 0.13.1.

project/build.properties 如下:

sbt.version=0.13.1

执行 sbt about 打印出以下内容:

Executing sbt about prints out the following:

$ sbt
[info] Loading global plugins from /Users/jacek/.sbt/0.13/plugins
[info] Loading project definition from /Users/jacek/sandbox/so/sbt-0.13.1/project
[info] Set current project to sbt-0-13-1 (in build file:/Users/jacek/sandbox/so/sbt-0.13.1/)
[sbt-0-13-1]> about
[info] This is sbt 0.13.1
[info] The current project is {file:/Users/jacek/sandbox/so/sbt-0.13.1/}sbt-0-13-1 0.1-SNAPSHOT
[info] The current project is built against Scala 2.10.4-RC1
[info] Available Plugins: com.typesafe.sbt.SbtGit, com.typesafe.sbt.SbtProguard, growl.GrowlingTests, np.Plugin, net.virtualvoid.sbt.graph.Plugin, com.timushev.sbt.updates.UpdatesPlugin
[info] sbt, sbt plugins, and build definitions are using Scala 2.10.3

使用以下任务 - hello - 在 build.sbt 中:

With the following task - hello - in build.sbt:

scalaVersion := "2.10.4-RC1"

lazy val hello = taskKey[Unit]("An example task")

hello := {
  print("Sleeping for a sec...")
  println("done.")
}

...和reload，sbt 报告[error] Type error in expression:

...and reload, sbt reports [error] Type error in expression:

[sbt-0-13-1]> reload
[info] Loading global plugins from /Users/jacek/.sbt/0.13/plugins
[info] Loading project definition from /Users/jacek/sandbox/so/sbt-0.13.1/project
/Users/jacek/sandbox/so/sbt-0.13.1/build.sbt:6: error: type mismatch;
 found   : String("Sleeping for a sec...")
 required: sbt.TaskKey[String]
  print("Sleeping for a sec...")
        ^
[error] Type error in expression
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

当我将 print 更改为 println 时，任务定义正确.

When I change print to println the task is defined correctly.

Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? r
[info] Loading global plugins from /Users/jacek/.sbt/0.13/plugins
[info] Loading project definition from /Users/jacek/sandbox/so/sbt-0.13.1/project
[info] Set current project to sbt-0-13-1 (in build file:/Users/jacek/sandbox/so/sbt-0.13.1/)
[sbt-0-13-1]> hello
Sleeping for a sec...
done.
[success] Total time: 0 s, completed Jan 4, 2014 10:31:43 AM

任务定义中不接受print吗?

推荐答案

在 schleichardt 的帮助下，我终于找到了找出导致在 hello 任务中不接受 print 问题的原因.

With the help of schleichardt I could finally find out what has caused the issue of not accepting print in the hello task.

事实证明，使用 sbt-dependency-graph 插件在全局配置目录，即 ~/.sbt/0.13/(或由 sbt.global.base 指定的目录)，sbt 无法初始化任务，因此出现错误.

It turned out that with the sbt-dependency-graph plugin in the global configuration directory, i.e. ~/.sbt/0.13/ (or a directory specified by sbt.global.base), sbt couldn't initialize the task and hence the error.

$ cat plugins/sbt-dependency-graph.sbt
addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.7.4")

$ cat sbt-dependency-graph.sbt
net.virtualvoid.sbt.graph.Plugin.graphSettings

要重现，请参见 build.sbt 中以 print(not println)开头的以下 sbt 会话和空全局配置目录:

To reproduce, see the following sbt session starting with print (not println) in build.sbt and empty global configuration directory:

jacek:~/sandbox/so/sbt-0.13.1
$ tree
.
├── build.sbt
└── project
    └── build.properties

1 directory, 2 files

jacek:~/sandbox/so/sbt-0.13.1
$ cat build.sbt
scalaVersion := "2.10.4-RC1"

lazy val hello = taskKey[Unit]("An example task")

hello := {
  print("Sleeping for a sec...")
  println("done.")
}

jacek:~/sandbox/so/sbt-0.13.1
$ sbt -Dsbt.global.base=/tmp/so
Getting org.scala-sbt sbt 0.13.1 ...
:: retrieving :: org.scala-sbt#boot-app
    confs: [default]
    43 artifacts copied, 0 already retrieved (12646kB/154ms)
Getting Scala 2.10.3 (for sbt)...
:: retrieving :: org.scala-sbt#boot-scala
    confs: [default]
    5 artifacts copied, 0 already retrieved (24447kB/204ms)
[info] Loading project definition from /Users/jacek/sandbox/so/sbt-0.13.1/project
[info] Updating {file:/Users/jacek/sandbox/so/sbt-0.13.1/project/}sbt-0-13-1-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Set current project to sbt-0-13-1 (in build file:/Users/jacek/sandbox/so/sbt-0.13.1/)
> hello
Sleeping for a sec...done.
[success] Total time: 0 s, completed Jan 4, 2014 1:35:22 PM

到目前为止它有效.

在全局配置中为sbt-dependency-graph插件创建文件目录.

Create the files for the sbt-dependency-graph plugin in the global configuration directory.

jacek:/tmp/so
$ cat plugins/sbt-dependency-graph.sbt
addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.7.4")

jacek:/tmp/so
$ cat sbt-dependency-graph.sbt
net.virtualvoid.sbt.graph.Plugin.graphSettings

...和重新加载.

> reload
[info] Loading global plugins from /private/tmp/so/plugins
[info] Updating {file:/tmp/so/plugins/}global-plugins...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Loading project definition from /Users/jacek/sandbox/so/sbt-0.13.1/project
[info] Updating {file:/Users/jacek/sandbox/so/sbt-0.13.1/project/}sbt-0-13-1-build...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
/Users/jacek/sandbox/so/sbt-0.13.1/build.sbt:6: error: type mismatch;
 found   : String("Sleeping for a sec...")
 required: sbt.TaskKey[String]
  print("Sleeping for a sec...")
        ^
[error] Type error in expression
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

当 print 变成 println 和 (r)etry 时，它又可以正常工作了.

When print changes to println and (r)etry, it works fine again.

Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? r
[info] Loading global plugins from /private/tmp/so/plugins
[info] Loading project definition from /Users/jacek/sandbox/so/sbt-0.13.1/project
[info] Set current project to sbt-0-13-1 (in build file:/Users/jacek/sandbox/so/sbt-0.13.1/)
> hello
Sleeping for a sec...
done.
[success] Total time: 0 s, completed Jan 4, 2014 1:43:59 PM

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