day 1 puzzle 1

AdventOfCode2023.iml

@@ -3,10 +3,14 @@
   <component name="NewModuleRootManager" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/res" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/tests_res" type="java-test-resource" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="scala-sdk-2.13.12" level="application" />
+    <orderEntry type="library" name="scalatest.scalatest_2.13" level="project" />
   </component>
 </module>

src/day1/Puzzle1.scala

@@ -0,0 +1,29 @@
+package day1
+
+import scala.io.{BufferedSource, Source}
+
+object Puzzle1 {
+  def loadInput(path: String): Int = {
+    var sum: Int = 0
+    val source: BufferedSource = Source.fromFile(path)
+    for (line: String <- source.getLines()) {
+      var a: Int = -1
+      var b: Int = -1
+      for (c: Char <- line) {
+        if ('0' <= c && c <= '9') {
+          if (a == -1) {
+            a = c - '0'
+          }
+          b = c - '0'
+        }
+      }
+      sum += a*10 + b
+    }
+    source.close()
+    return sum
+  }
+  def main(args: Array[String]): Unit = {
+    val sum: Int = loadInput("res/day1/input1.txt")
+    println(s"sum = $sum")
+  }
+}

tests/day1/Puzzle1Tester.scala

@@ -0,0 +1,9 @@
+package day1
+
+import org.scalatest.funsuite.AnyFunSuite
+
+class Puzzle1Tester extends AnyFunSuite {
+  test("Puzzle1.loadInput") {
+    assert(Puzzle1.loadInput("tests_res/day1/input1.txt") == 142)
+  }
+}

tests_res/day1/input1.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet