[英]Re-import a script in Ammonite (scala)
I can import a script's methods/variables in Ammonite using import $file.MyScript, MyScript._
.我可以使用
import $file.MyScript, MyScript._
在 Ammonite 中导入脚本的方法/变量。 It works well the first time but what if I wish to import an updated version of MyScript.sc
?第一次运行良好,但如果我想导入更新版本的
MyScript.sc
怎么办?
Documentation suggests to do文档建议做
@ repl.sess.load()
Which initialises the REPL, allowing me to import the script again.它初始化 REPL,允许我再次导入脚本。 Sounds good, however, I then get a
java.lang.NoClassDefFoundError
when I import the script again -- see an example session below.听起来不错,但是,当我再次导入脚本时,我得到一个
java.lang.NoClassDefFoundError
- 请参阅下面的示例 session。
repl.sess.load()
may not be the right functionality here, but then how can I re-import a script after updating it? repl.sess.load()
在这里可能不是正确的功能,但是更新后如何重新导入脚本?
I know that there is a functionality to re-run a script after making changes using Ammonite script with a --watch
argument, but that is not using the REPL, so it is not a good workaround.我知道有一个功能可以在使用带有
--watch
参数的 Ammonite 脚本进行更改后重新运行脚本,但这不是使用 REPL,所以这不是一个好的解决方法。
Example session示例 session
// As per docs: "If you want to re-load a script, you should use Ammonite's Save/Load Session functionality to
// sess.save() the session before importing the script, and sess.load()ing to reset the script
// before re-importing it."
@ repl.sess.save()
@ import $file.MyScript, MyScript._
Compiling /File/Path/MyScript.sc
import $file.$ , MyScript._
@ myWord
res2: String = "mountain"
@ surroundWord(myWord)
res3: String = "barwordfoo"
@ repl.sess.load()
res4: ammonite.repl.api.SessionChanged = SessionChanged(
HashSet(
Symbol(notify),
Symbol(prefixWord),
Symbol(wait),
Symbol(equals),
Symbol(asInstanceOf),
Symbol(synchronized),
Symbol(notifyAll),
Symbol(isInstanceOf),
Symbol(!=),
Symbol(res2),
Symbol(ne),
Symbol(hashCode),
Symbol(surroundWord),
Symbol(myWord),
Symbol(res3),
Symbol(==),
...
@ myWord
cmd5.sc:1: not found: value myWord
val res5 = myWord
^
Compilation Failed
@ import $file.MyScript, MyScript._
import $file.$ , MyScript._
@ myWord
java.lang.NoClassDefFoundError: ammonite/$sess/MyScript$
ammonite.$sess.cmd6$.<clinit>(cmd6.sc:1)
java.lang.ClassNotFoundException: ammonite.$sess.MyScript$
java.net.URLClassLoader.findClass(URLClassLoader.java:435)
ammonite.runtime.SpecialClassLoader.findClass(ClassLoaders.scala:241)
java.lang.ClassLoader.loadClass(ClassLoader.java:589)
java.lang.ClassLoader.loadClass(ClassLoader.java:522)
ammonite.$sess.cmd6$.<clinit>(cmd6.sc:1)
Think it's an issue, which I raised here .认为这是我在这里提出的问题。
I also understand that there's alternative functionality that almost achieves the same outcome and works well.我也知道有替代功能几乎可以达到相同的结果并且效果很好。 Use
利用
amm --watch --predef MyScript.sc
This launches the Ammonite REPL, with the predef
argument loading the script, and the watch
argument reloading the script with any saved changes whenever I exit the REPL.这会启动 Ammonite REPL,
predef
参数会加载脚本,而watch
参数会在我退出 REPL 时使用已保存的更改重新加载脚本。
So my typical workflow is所以我典型的工作流程是
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