Tools: added options to board_list.py

make it easier to rebuild all bootloaders for AP_Periph with:

  ./Tools/scripts/board_list.py AP_Periph --per-line | xargs -i ./Tools/scripts/build_bootloaders.py '{}'

Tools/scripts/board_list.py

@@ -181,9 +181,21 @@ AUTOBUILD_BOARDS = BoardList().find_autobuild_boards()
 AP_PERIPH_BOARDS = BoardList().find_ap_periph_boards()
 
 if __name__ == '__main__':
-    import sys
-    if len(sys.argv) < 2:
-        print("Usage: board_list.py TARGET")
-        sys.exit(1)
+    import argparse
+    parser = argparse.ArgumentParser(description='list boards to build')
+
+    parser.add_argument('target')
+    parser.add_argument('--per-line', action='store_true', default=False, help='list one per line for use with xargs')
+    args = parser.parse_args()
     board_list = BoardList()
-    print(sorted(board_list.find_autobuild_boards(sys.argv[1])))
+    target = args.target
+    if target == "AP_Periph":
+        blist = board_list.find_ap_periph_boards()
+    else:
+        blist = board_list.find_autobuild_boards(target)
+    blist = sorted(blist)
+    if args.per_line:
+        for b in blist:
+            print(b)
+    else:
+        print(blist)