It's now possible to specify additional custom board parameters when running the IDE from the command line

Eg: --board arduino:avr:pro:cpu=8MHzatmega168,other=value
Closes #1353

Author: Federico Fissore

app/src/processing/app/Base.java

@@ -1473,9 +1473,18 @@ private void selectBoard(String selectBoard) {
     String[] split = selectBoard.split(":");
     Preferences.set("target_package", split[0]);
     Preferences.set("target_platform", split[1]);
-    Preferences.set("board", split[2]);
+    String boardId = split[2];
+    Preferences.set("board", boardId);
 
-    filterVisibilityOfSubsequentBoardMenus(split[2], 1);
+    if (split.length > 3) {
+      String[] customsParts = split[3].split(",");
+      for (String customParts : customsParts) {
+        String[] keyValue = customParts.split("=");
+        Preferences.set("custom_" + keyValue[0].trim(), boardId + "_" + keyValue[1].trim());
+      }
+    }
+
+    filterVisibilityOfSubsequentBoardMenus(boardId, 1);
 
     onBoardOrPortChange();
     Sketch.buildSettingChanged();