Add a simple python script to check for common formatting errors (tabs and line endings) and fix existing problems.

a step towards #315

README.md

@@ -50,7 +50,7 @@ sudo apt install libgl-dev libasound2-dev libx11-dev libxcursor-dev libxrandr-de
 
 # Contributing
 ### Code
-Try to follow the style of the existing code. `// TODO: Add a style guide` <br>
+Try to follow the style of the existing code. The `check_format.py` file can be used to find violations of indentation and line endings. `// TODO: Add a full style guide` <br>
 If you have any more questions, you can ask them over on [Discord](https://discord.gg/XtqCRRG).
 ### Textures
 If you want to add new textures, make sure they fit the style of the game.

assets/cubyz/shaders/deferred_render_pass.fs

@@ -1,6 +1,5 @@
 #version 430
 out vec4 fragColor;
-  
 in vec2 texCoords;
 
 uniform sampler2D color;

format_check.py

@@ -0,0 +1,43 @@
+import os
+
+import sys
+
+directory = os.fsencode(".")
+
+fails = 0
+
+for subdir, dirs, files in os.walk("."):
+	for file in files:
+		#print os.path.join(subdir, file)
+		filepath = subdir + os.sep + file
+		if filepath.startswith("./compiler"): continue
+		if filepath.startswith("./saves"): continue
+		if filepath.startswith("./serverAssets"): continue
+		if filepath.startswith("./zig-cache"): continue
+
+		if filepath.endswith(".json") or filepath.endswith(".zig") or filepath.endswith(".py") or filepath.endswith(".zon") or filepath.endswith(".vs") or filepath.endswith(".fs") or filepath.endswith(".glsl"):
+			with open(filepath, "r") as f:
+				string = f.read()
+				line = 1
+				lineStart = True
+				for i, c in enumerate(string):
+					if(c == '\r'):
+						print("Incorrect line ending \\r in file ", filepath, " in line ", line, ". Please configure your editor to use LF instead of CRLF.")
+						fails += 1
+					elif(c == '\n'):
+						line += 1
+						lineStart = True
+					elif(c == ' '):
+						if(lineStart):
+							print("Incorrect indentation in file ", filepath, " in line ", line, ". Please use tabs instead of spaces.")
+							fails += 1
+							lineStart = False # avoid repeating this error multiple times
+					elif(c == '\t'):
+						continue
+					elif(lineStart):
+						lineStart = False
+					else:
+						continue
+if(fails != 0):
+	sys.exit(1)
+sys.exit(0)