Add ShadowJar compatibility and Query file can be define name with comment

Add Migration and Query definition class
Add Docker DB for tests

src/main/kotlin/fr/postgresjson/definition/Function.kt

@@ -1,14 +1,15 @@
 package fr.postgresjson.definition
 
 import java.io.File
+import java.nio.file.Path
 
-open class Function(
-    override val script: String
+class Function(
+    override val script: String,
+    override var source: Path? = null
 ) : Resource, ParametersInterface {
     val returns: String
     override val name: String
     override val parameters: List<Parameter>
-    override var source: File? = null
 
     init {
         val functionRegex =
@@ -46,8 +47,7 @@ open class Function(
         }
     }
 
-    abstract class ParseException(message: String, cause: Throwable? = null) : Exception(message, cause)
-    class FunctionNotFound(cause: Throwable? = null) : ParseException("Function not found in script", cause)
+    class FunctionNotFound(cause: Throwable? = null) : Resource.ParseException("Function not found in script", cause)
 
     fun getDefinition(): String {
         return parameters

src/main/kotlin/fr/postgresjson/definition/Migration.kt

@@ -0,0 +1,35 @@
+package fr.postgresjson.definition
+
+import java.nio.file.Path
+
+class Migration(
+    override val script: String,
+    source: Path
+) : Resource {
+    override val name: String
+    val direction: Direction
+    override var source: Path? = null
+
+    init {
+        this.source = source
+        this.direction = source.fileName.toString()
+            .let {
+                when {
+                    it.endsWith(".down.sql") -> Direction.DOWN
+                    it.endsWith(".up.sql") -> Direction.UP
+                    else -> throw MigrationNotFound()
+                }
+            }
+        this.name = source.fileName.toString()
+            .substringAfterLast("/")
+            .let {
+                when (direction) {
+                    Direction.DOWN -> it.substringBefore(".down.sql")
+                    Direction.UP -> it.substringBefore(".up.sql")
+                }
+            }
+    }
+
+    class MigrationNotFound(cause: Throwable? = null) : Resource.ParseException("Migration not found in script", cause)
+    enum class Direction { UP, DOWN }
+}

src/main/kotlin/fr/postgresjson/definition/Query.kt

@@ -0,0 +1,25 @@
+package fr.postgresjson.definition
+
+import java.nio.file.Path
+
+class Query(
+    override val script: String,
+    source: Path
+) : Resource {
+    override var source: Path? = source
+    override val name: String = getNameFromComment(script) ?: getNameFromFile(source)
+
+    /** Try to get name from comment in file */
+    private fun getNameFromComment(script: String): String? =
+        """-- *name ?: ?(?<name>[^ \n]+)"""
+            .toRegex(setOf(RegexOption.IGNORE_CASE, RegexOption.MULTILINE))
+            .find(script)?.let {
+            it.groups["name"]?.value?.trim()
+        }
+
+    /** Try to get name from the filename */
+    private fun getNameFromFile(source: Path): String = source
+        .fileName.toString()
+        .substringAfterLast("/")
+        .substringBeforeLast(".sql")
+}

src/main/kotlin/fr/postgresjson/definition/Resource.kt

@@ -1,11 +1,38 @@
 package fr.postgresjson.definition
 
 import java.io.File
+import java.net.URL
+import java.nio.file.Path
 
 interface Resource {
     val name: String
     val script: String
-    var source: File?
+    var source: Path?
+
+    open class ParseException(message: String, cause: Throwable? = null) : Exception(message, cause)
+
+    companion object {
+        fun build(file: File): Resource =
+            build(file.readText(), Path.of(file.toURI()))
+
+        fun build(url: URL): Resource =
+            build(url.readText(), Path.of(url.toURI()))
+
+        fun build(resource: String, path: Path): Resource =
+            try {
+                Function(resource, path)
+            } catch (e: ParseException) {
+                try {
+                    Migration(resource, path)
+                } catch (e: ParseException) {
+                    try {
+                        Query(resource, path)
+                    } catch (e: ParseException) {
+                        throw ParseException("No SQL resource found")
+                    }
+                }
+            }
+    }
 }
 
 interface ResourceCollection {