so the bigger picture is I have an app that on startup checks a folder for ammonite scripts that is loads and runs. The scripts for the purpose of this example can register plugins with the app. Trying to setup the plugin registration to be a bit simpler. What I really need is the script to return a value OR to give me all the things defined in teh script.
I need to know what is in the script so I/we can auto register everything. What we do now is pass in a context where you explicitly reguister stuff.,
any chance you can point at mill code that does that ?
@fizzy33 should be this https://github.com/com-lihaoyi/mill/blob/main/main/core/src/define/Module.scala#L59-L72. Nothing fancy, it's literally just poking at the "Module" object (which in Mill is every static object, including the top-level script wrapper) using good old Java reflection
I'm also trying to write something simple with IO that runs perfectly fine in the ammonite repl but hangs halfway when run as a script
$ amm
Loading...
Welcome to the Ammonite Repl 2.4.0 (Scala 2.13.6 Java 11.0.11)
kneissl-kneissl@ browse("hello")
cmd0.sc:1: could not find implicit value for parameter pp: pprint.PPrinter
val res0 = browse("hello")
^
Compilation Failed
Loading...
Welcome to the Ammonite Repl 2.4.0 (Scala 2.13.6 Java 11.0.11)
kneissl-kneissl@ browse("hello")
cmd0.sc:1: could not find implicit value for parameter pp: pprint.PPrinter
val res0 = browse("hello")
^
Compilation Failed
1 reply
@emeinhardt unfortunately I never did resolve how to use cats-effect inside an ammonite script, despite it working fine in a repl session. I ended up just not using a script and instead using
mill to write a simple app object Main extends IOApp { def run(args: List[Stirng)) = ??? } in main/src/Main.scala. Then using mill -i main.run <arg1> <arg2> . The -i flag in mill is necessary to make things like IO.readLine work as expected.
@lihaoyi looking through the mill code is a great help thanks. The last piece that I am missing is where in the code is ammonite running the script and returning the objects in the script. So in mill you have
import mill._, scalalib._
object foo extends ScalaModule {
def scalaVersion = "3.0.2"
}Something is evaluating the script seeing there is a foo in there and then extracting the instance out. I can see the reflection stuff you have shared as being highly useful and I think I am just missing how I can get the "foo" out of that ammonite script.
here is my very naive approach
val runner: Main =
ammonite.Main(
predefCode = "println(\"running\")",
)
val results = runner.runCode("""object Bob { println("running 2"); def foo = 1 }""")
val results2 = runner.runCode("""println(Bob.toString)""")
which gives
cmd0.sc:1: not found: value Bob
val res = println(Bob.toString)
^
another way of asking this is if I dig into
results I can see there is a "Bob" term in the script but how do I get to access it's actual instance
anywho curious if you recommend a path @lihaoyi
Can you import a java dependency with ivy?
import $ivy.org.apache.hadoop::hadoop-client:3.3.0` fails with a not found exception not found: https://repo1.maven.org/maven2/org/apache/hadoop/hadoop-client_2.13/3.3.0/hadoop-client_2.13-3.3.0.pom`. It looks like the link tries to find a scala version of the java library.
@lihaoyi I figured it all out by staring at the mill code, thanks again for your assistance. I can see in MainRunner how a
CustomCodeWrapper is used and then in RunScipt the def millSelf = Some(this) that is provided in the CustomCodeWrapper is called to get the actual modeul insance. that is the pattern I needed.
I'm seeing:
Welcome to the Ammonite Repl 2.4.0 (Scala 2.13.6 Java 1.8.0_121)
@ wd
cmd0.sc:1: not found: value wd
val res0 = wd
^
Compilation Failed
hmmm, found the example predef, but can't seem to configure my prompt?
thomas-Downloads@ repl.colors().prompt() = fansi.Attrs.Empty
cmd0.sc:1: value colors in trait FullReplAPI cannot be accessed as a member of ammonite.repl.FullReplAPI from object cmd0 in package $sess
Access to protected value colors not permitted because
enclosing object cmd0 in package $sess is not a subclass of
trait FullReplAPI in package repl where target is defined
val res0 = repl.colors().prompt() = fansi.Attrs.Empty
^
Compilation Failed
okay, got that figured out, but can't get my colors to actually apply.
@lihaoyi - tried following suggested setup in #399 and I can (a) construct a colored string, (b) reset the prompt color
@lihaoyi - tried following suggested setup in #399 and I can (a) construct a colored string, (b) reset the prompt color
but I can't actually get the prompt to use the colors in the string
I have this snippet:
interp.colors().prompt() = fansi.Color.Reset
{
val hostname:String = (%%hostname("-s")).out.string.trim
val Home = Path(sys.props("user.home"))
val username = sys.props("user.name")
import fansi.Color._
repl.prompt.bind("" + DarkGray("[") + LightBlue(username) + DarkGray("@") + LightMagenta(hostname) + DarkGray("] ") + LightGray(wd match { case Home => "~"; case `root` => "/"; case other => other.baseName }) + DarkGray(" $") + Reset(" "))
}
and
Console.println(repl.prompt() shows the correct colors, but the actual prompt is reset to white
I think the interp.colors.prompt is being applied on top of the repl.prompt and resetting all your colors
that appears to work =)
I'm trying to run a spark session in the repl. There's a conflict between the bundled spark version, 2.5, of protobuf and the tertiary dependency pulled in by scalapb of protobuf (3.15). Scalapb says this should be shaded to avoid conflicts with spark.
Not sure how to do this with mill
That is, suppose I have a
Util.sc file like this:
object Util {
def api(param: Int) = "result"
}
In Mill I can just do
import $file.Util; Util.api(7) == "result"
In SBT, perhaps I could access the ammonite script runner as a library, parse Util.sc, and tell it to invoke
"Util.api(${7})" somehow?
