diff --git a/.gitignore b/.gitignore
index 259148f..3af089a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,3 +30,18 @@
 *.exe
 *.out
 *.app
+
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+CMakeUserPresets.json
+
+build/*
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..f6683f0
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(TabSpace)
+set (CMAKE_CXX_STANDARD 20)
+
+add_executable(TabSpace
+	src/main.cpp
+)
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..5c2df43
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,288 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <sstream>
+#include <vector>
+
+enum TokenType {
+	TAB,
+	SPACE,
+	NEWLINE,
+	UNKNOWN,
+};
+
+enum TokenTag {
+	NONE,
+	WARNING,
+	ERROR,
+};
+
+struct Token {
+	TokenType type;
+	size_t line;
+	size_t column;
+	size_t pos;
+	TokenTag tag;
+	std::string text;
+};
+
+TokenType getTokenType(char c) {
+	switch(c) {
+		case '\t': return TAB;
+		case ' ': return SPACE;
+		case '\r': return NEWLINE;
+		case '\n': return NEWLINE;
+		default: return UNKNOWN;
+	}
+}
+
+std::vector<Token> tokenize(std::string text)
+{
+	std::vector<Token> tokens = {};
+	size_t line = 1;
+	size_t column = 1;
+	size_t pos = 0;
+
+	Token last = {
+		.type = getTokenType(text[pos]),
+		.line = line,
+		.column = column,
+		.pos = pos,
+		.text = "",
+	};
+
+	while(pos < text.size()) {
+		char c = text[pos];
+		TokenType type = getTokenType(c);
+		switch(type) {
+			case TAB:
+			case SPACE: {
+				tokens.push_back(last);
+				last = Token{
+					.type = type,
+					.line = line,
+					.column = column,
+					.pos = pos,
+					.text = "",
+				};
+				last.text += c;
+			} break;
+			case NEWLINE:
+			case UNKNOWN: {
+				if(type != last.type) {
+					tokens.push_back(last);
+					last = Token{
+						.type = type,
+						.line = line,
+						.column = column,
+						.pos = pos,
+						.text = "",
+					};
+				}
+				last.text += c;
+			};
+		}
+		column += 1;
+		if(type == NEWLINE) {
+			line += 1;
+			column = 1;
+		}
+		pos += 1;
+	}
+	tokens.push_back(last);
+
+	return tokens;
+}
+
+struct TabSpaceCount {
+	size_t tabs;
+	size_t spaces;
+
+	std::vector<Token> tokens;
+
+	bool isEmpty() {
+		return tabs == 0 && spaces == 0 && ((tokens.size() == 1 && tokens[0].type == NEWLINE) || tokens.size() == 1);
+	}
+};
+
+#define BULLET "\xE2\x80\xA2"
+
+void printErrorStart(std::vector<TabSpaceCount> counts) {
+	Token firstToken;
+	for(auto count : counts) {
+		if(count.tokens.size() > 0) {
+			firstToken = count.tokens[0];
+			break;
+		}
+	}
+	printf("Line: %d\n", firstToken.line);
+	for(auto& count : counts) {
+		bool ErrorTokens = true;
+		for(auto& token : count.tokens) {
+			if(ErrorTokens && token.type == TAB) {
+				printf("\e[31;1m--->\e[0m");
+			}
+			else if(ErrorTokens && token.type == SPACE) {
+				printf("\e[31;1m" BULLET "\e[0m");
+			}
+			else {
+				ErrorTokens = false;
+				printf("%s", token.text.c_str());
+			}
+		}
+	}
+	printf("\n");
+}
+
+void printWarnErr(std::vector<TabSpaceCount> counts) {
+	Token firstToken;
+	for(auto count : counts) {
+		if(count.tokens.size() > 0) {
+			firstToken = count.tokens[0];
+			break;
+		}
+	}
+	printf("Line: %d\n", firstToken.line);
+	for(auto count : counts) {
+		TokenTag lastTag = NONE;
+		for(auto token : count.tokens) {
+			if(lastTag != token.tag) {
+				lastTag = token.tag;
+				switch(lastTag) {
+				case NONE:
+					printf("\e[0m");
+					break;
+				case WARNING:
+					printf("\e[33;1m");
+					break;
+				case ERROR:
+					printf("\e[31;1m");
+					break;
+				}
+			}
+			if(token.type == TAB) {
+				printf("--->");
+			}
+			else if(token.type == SPACE) {
+				printf(BULLET);
+			} else printf("%s", token.text.c_str());
+		}
+		printf("\e[0m");
+	}
+	printf("\n");
+}
+
+bool checkTrailingWhitespace(TabSpaceCount& count) {
+	bool ret = false;
+	for(int i=((int)count.tokens.size())-1; i >= 0; --i) {
+		if(count.tokens[i].type == SPACE || count.tokens[i].type == TAB) {
+			count.tokens[i].tag = ERROR;
+			ret = true;
+		}
+		else if (count.tokens[i].type == NEWLINE) {}
+		else {
+			break;
+		}
+	}
+	return ret;
+}
+
+void tagLeadingWhitespace(TabSpaceCount& count, TokenTag tag) {
+	for(auto& token : count.tokens) {
+		if(token.type == UNKNOWN) break;
+		token.tag = tag;
+	}
+}
+
+int main(int argc, char** argv)
+{
+	int count = 0;
+
+	for (int i = 1; i < argc; ++i) {
+		printf("---------- %s ----------\n", argv[i]);
+		std::ifstream t(argv[i]);
+		std::stringstream buffer;
+		buffer << t.rdbuf();
+		std::string str = buffer.str();
+
+		auto tokens = tokenize(str);
+
+		std::vector<TabSpaceCount> counts = {};
+		size_t tabCount = 0;
+		bool recording = true;
+		TabSpaceCount lastCount = {};
+		for(Token token : tokens) {
+			switch(token.type) {
+				case TAB:
+					if(recording) lastCount.tabs += 1;
+					lastCount.tokens.push_back(token);
+					break;
+				case SPACE:
+					if(recording) lastCount.spaces += 1;
+					lastCount.tokens.push_back(token);
+					break;
+				case UNKNOWN:
+					recording = false;
+					lastCount.tokens.push_back(token);
+					break;
+				case NEWLINE: {
+					lastCount.tokens.push_back(token);
+					counts.push_back(lastCount);
+					lastCount = {};
+					recording = true;
+				} break;
+			}
+		}
+		counts.push_back(lastCount);
+
+		for(size_t i=0; i<counts.size(); ++i) {
+			TabSpaceCount& count = counts[i];
+			TabSpaceCount& lastIndentCount = (i>0) ? counts[i-1] : counts[0];
+
+			bool hasIssue = false;
+			bool needsContext = false;
+
+			//Tabs and spaces changed
+			if(lastIndentCount.tabs != count.tabs && count.spaces != 0) {
+				tagLeadingWhitespace(count, ERROR);
+				tagLeadingWhitespace(lastIndentCount, ERROR);
+				hasIssue = true;
+				needsContext = true;
+			}
+			if(lastIndentCount.tabs != count.tabs && lastIndentCount.spaces != 0) {
+				tagLeadingWhitespace(count, ERROR);
+				tagLeadingWhitespace(lastIndentCount, ERROR);
+				hasIssue = true;
+				needsContext = true;
+			}
+			if(abs(lastIndentCount.tabs - count.tabs) > 1 &&
+			   abs(counts[i-2].tabs - count.tabs) != 1 &&
+			   count.tabs != 0 && lastIndentCount.tabs != 0)
+			{
+				tagLeadingWhitespace(count, ERROR);
+				tagLeadingWhitespace(lastIndentCount, ERROR);
+				hasIssue = true;
+				needsContext = true;
+			}
+			if(checkTrailingWhitespace(count)) {
+				hasIssue = true;
+			}
+			if(count.tabs == 0 && count.spaces > 0) {
+				tagLeadingWhitespace(count, WARNING);
+				hasIssue = true;
+			}
+
+			if(hasIssue) {
+				if(needsContext) {
+					printWarnErr({lastIndentCount, count});
+				}
+				else
+				{
+					printWarnErr({count});
+				}
+			}
+		}
+	}
+
+	return count;
+}