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In IOLifts.fromOption, be more efficient in error case. #15

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merged 1 commit into from
Jan 6, 2023
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In IOLifts.fromOption, be more efficient in error case. #15

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22 changes: 11 additions & 11 deletions src/main/scala/afenton/bazel/bsp/IOLifts.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@ package afenton.bazel.bsp

import cats.effect.IO
import scala.quoted.*
import java.nio.file.Paths
import scala.util.control.NonFatal

object IOLifts {
/** Convert an Option to an IO or make a good error message
Expand All @@ -18,19 +20,17 @@ object IOLifts {

def fromOptionImpl[A: Type, B: Type](expr: Expr[Option[A]], fn: Expr[A => IO[B]])(using ctx: Quotes): Expr[IO[B]] = {
val rootPosition = ctx.reflect.Position.ofMacroExpansion
val file = Expr(rootPosition.sourceFile.path)
val line = Expr((rootPosition.startLine + 1).toString)
val show = Expr(expr.show)
val absFile: String = rootPosition.sourceFile.path
val file = try {
Paths.get("").toAbsolutePath.relativize(Paths.get(absFile)).toString
} catch {
case NonFatal(_) => absFile
}
val line = rootPosition.startLine + 1
val msg = Expr(s"expected ${expr.show} to be defined in file: $file at line: $line")

val errorCase = '{
val str = new StringBuilder
str.append("expected ")
str.append(${show})
str.append(" to be defined in file: ")
str.append(${file})
str.append(" at line: ")
str.append(${line})
IO.raiseError[B](new java.util.NoSuchElementException(str.toString()))
IO.raiseError[B](new java.util.NoSuchElementException($msg))
}

expr match {
Expand Down