Create Available PIDs Command

Author: eltonvs

command/src/main/kotlin/com/github/eltonvs/obd/command/Response.kt

@@ -40,7 +40,7 @@ data class ObdRawResponse(
         )
     }
 
-    private val processedValue by lazy { value.pipe(*valueProcessorPipeline) }
+    val processedValue by lazy { value.pipe(*valueProcessorPipeline) }
 
     val bufferedValue by lazy { processedValue.chunked(2) { it.toString().toInt(radix = 16) }.toIntArray() }
 }

command/src/main/kotlin/com/github/eltonvs/obd/command/control/AvailableCommands.kt

@@ -0,0 +1,36 @@
+package com.github.eltonvs.obd.command.control
+
+import com.github.eltonvs.obd.command.ObdCommand
+import com.github.eltonvs.obd.command.ObdRawResponse
+
+
+class AvailablePIDsCommand(val range: AvailablePIDsRanges) : ObdCommand() {
+    override val tag = "AVAILABLE_COMMANDS_${range.name}"
+    override val name = "Available Commands - ${range.displayName}"
+    override val mode = "01"
+    override val pid = range.pid
+
+    override val defaultUnit = ""
+    override val handler = { it: ObdRawResponse ->
+        parsePIDs(it.processedValue).joinToString(",") { "%02X".format(it) }
+    }
+
+    private fun parsePIDs(rawValue: String): IntArray {
+        val value = rawValue.toLong(radix = 16)
+        val initialPID = range.pid.toInt(radix = 16)
+        return (1..33).fold(listOf<Int>()) { acc, i ->
+            if (getBit(value, i) == 1) acc + listOf(i + initialPID)
+            else acc
+        }.toIntArray()
+    }
+
+    private fun getBit(number: Long, position: Int) = (number shr (32 - position) and 1).toInt()
+
+    enum class AvailablePIDsRanges(val displayName: String, internal val pid: String) {
+        PIDS_01_TO_20("PIDs from 01 to 20", "00"),
+        PIDS_21_TO_40("PIDs from 21 to 40", "20"),
+        PIDS_41_TO_60("PIDs from 41 to 60", "40"),
+        PIDS_61_TO_80("PIDs from 61 to 80", "60"),
+        PIDS_81_TO_100("PIDs from 81 to 100", "80")
+    }
+}