Improve 'xl add' with a check on the present of the target

src/makefiles.common/targets/Makefile_eg2k

@@ -1,4 +1,5 @@
 
+
 ##############################################################################
 
 eg2k: $(ASSETS_PATH)/z88dk_xchase.asm
@@ -7,6 +8,7 @@ eg2k: $(ASSETS_PATH)/z88dk_xchase.asm
 	-D__EG2K__ \
 	-subtype=eg2000disk \
 	-pragma-redirect:getk=getk_inkey \
+	-D_XL_SLOW_DOWN_FACTOR=$(_COMMON_SLOWDOWN_FACTOR)*$(_EG2K_SLOWDOWN) \
 	$(INCLUDE_OPTS) -DFORCE_BIT_BANG \
 	-D__EG2K__ \
 	-DFULL_GAME  \
@@ -20,10 +22,8 @@ eg2k: $(ASSETS_PATH)/z88dk_xchase.asm
 	-clib=default -pragma-redirect:fputc_cons=fputc_cons_generic \
 	$(CROSS_LIB_PATH)/display/init_graphics/z88dk/udg/udg_init_graphics.c \
 	$(ASSETS_PATH)/z88dk_xchase.asm \
-	$(SOURCE_PATH)/end_screen.c \
 	$(FULL_FILES) \
 	$(CROSS_LIB_PATH)/sound/z88dk/psg/ay-3-8910_psg_sounds.c \
 	-create-app -o$(BUILD_PATH)/X$(GAME_NAME)_eg2k.bin
 	rm -rf $(BUILD_PATH)/X$(GAME_NAME)_eg2k.bin
 
-

src/makefiles.common/targets/Makefile_einstein

@@ -0,0 +1,22 @@
+
+
+##############################################################################
+
+
+einstein: $(ASSETS_PATH)/z88dk_xchase.asm
+	$(Z88DK_PATH)$(MYZ88DK) +cpm $(SCCZ80_OPTS) -subtype=einstein -leinstein \
+	-pragma-define:ansicolumns=32 \
+	$(INCLUDE_OPTS) \
+	-D__EINSTEIN__ \
+	-DFORCE_CONIO_LIB \
+	-D_XL_SLOW_DOWN_FACTOR=$(_COMMON_SLOWDOWN_FACTOR)*$(_EINSTEIN_SLOWDOWN) \
+	-DFULL_GAME -DLESS_TEXT \
+	-clib=ansi \
+	-DCONIO -DUDG_GRAPHICS \
+	-create-app -o$(BUILD_PATH)/X$(GAME_NAME)_einstein.bin \
+	$(ASSETS_PATH)/z88dk_xchase.asm \
+	$(CROSS_LIB_PATH)/display/init_graphics/z88dk/udg/udg_init_graphics.c \
+	$(FULL_FILES)
+	rm -rf $(BUILD_PATH)/X$(GAME_NAME)_einstein.bin
+
+

src/xl

@@ -897,6 +897,17 @@ def add(params):
     else:
         print("target not found")
         exit()
+
+    project_path = "projects/" +  project
+
+    full_project_path = project_path + "/Makefile." + project
+
+    with open(full_project_path) as file:
+        project_makefile_content = file.read()
+
+    if(target+":" in project_makefile_content):
+        print("Target already present. First delete it from " + full_project_path)
+        exit()
 
     full_new_target_path = new_target_path + new_Makefile
 
@@ -905,9 +916,8 @@ def add(params):
     run_command_verbosely(command_string)
     print("\n")
 
-    project_path = "projects/" +  project
 
-    full_project_path = project_path + "/Makefile." + project
+
 
     command_string = "cat " + full_new_target_path + " >> " + full_project_path
     run_command_verbosely(command_string)
@@ -924,6 +934,11 @@ def help(params):
         print("")
         print("It adds support for the new target <target> into <project> by modifying its Makefile.")
         print("")
+        print("Example:")
+        print("If you have previously created a new project 'foo'")
+        print("(e.g., by cloning it with 'xl clone bomber foo'),")
+        print("then you can add support for the 'einstein' target to it with")
+        print("xl add foo einstein")
     elif params[1]=="tools":
         print("\nxl tools")
         print("\n(or xl build tools)")