7 files changed, 290 insertions, 0 deletions

diff --git a/src/crepe/util/CMakeLists.txt b/src/crepe/util/CMakeLists.txt
new file mode 100644
index 0000000..bbeaad9
--- /dev/null
+++ b/src/crepe/util/CMakeLists.txt
@@ -0,0 +1,12 @@
+target_sources(crepe PUBLIC
+	color.cpp
+	log.cpp
+	fmt.cpp
+)
+
+target_sources(crepe PUBLIC FILE_SET HEADERS FILES
+	color.h
+	log.h
+	fmt.h
+)
+
diff --git a/src/crepe/util/color.cpp b/src/crepe/util/color.cpp
new file mode 100644
index 0000000..a7bbc81
--- /dev/null
+++ b/src/crepe/util/color.cpp
@@ -0,0 +1,91 @@
+#include <cstdarg>
+
+#include "../api/Config.h"
+#include "color.h"
+#include "fmt.h"
+
+using namespace crepe::util;
+using namespace std;
+
+static constexpr const char * RESET_CODE = "\e[0m";
+
+const string LogColor::str(const string & content) {
+	auto & cfg = api::Config::get_instance();
+	string out = content;
+	if (cfg.log.color) out = this->code + out;
+	if (content.size() == 0) return out;
+	if (cfg.log.color) out = out + RESET_CODE;
+	return out;
+}
+
+const char * LogColor::c_str(const char * content) {
+	this->final = this->str(content == NULL ? "" : content);
+	return this->final.c_str();
+}
+
+const char * LogColor::fmt(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	string content = va_stringf(args, fmt);
+	va_end(args);
+	return this->c_str(content.c_str());
+}
+
+LogColor & LogColor::add_code(unsigned int code) {
+	this->code += stringf("\e[%dm", code);
+	return *this;
+}
+
+LogColor & LogColor::reset() {
+	this->code = RESET_CODE;
+	return *this;
+}
+
+LogColor & LogColor::fg_black(bool bright) {
+	return this->add_code(bright ? 90 : 30);
+}
+LogColor & LogColor::fg_red(bool bright) {
+	return this->add_code(bright ? 91 : 31);
+}
+LogColor & LogColor::fg_green(bool bright) {
+	return this->add_code(bright ? 92 : 32);
+}
+LogColor & LogColor::fg_yellow(bool bright) {
+	return this->add_code(bright ? 93 : 33);
+}
+LogColor & LogColor::fg_blue(bool bright) {
+	return this->add_code(bright ? 94 : 34);
+}
+LogColor & LogColor::fg_magenta(bool bright) {
+	return this->add_code(bright ? 95 : 35);
+}
+LogColor & LogColor::fg_cyan(bool bright) {
+	return this->add_code(bright ? 96 : 36);
+}
+LogColor & LogColor::fg_white(bool bright) {
+	return this->add_code(bright ? 97 : 37);
+}
+LogColor & LogColor::bg_black(bool bright) {
+	return this->add_code(bright ? 100 : 40);
+}
+LogColor & LogColor::bg_red(bool bright) {
+	return this->add_code(bright ? 101 : 41);
+}
+LogColor & LogColor::bg_green(bool bright) {
+	return this->add_code(bright ? 102 : 42);
+}
+LogColor & LogColor::bg_yellow(bool bright) {
+	return this->add_code(bright ? 103 : 43);
+}
+LogColor & LogColor::bg_blue(bool bright) {
+	return this->add_code(bright ? 104 : 44);
+}
+LogColor & LogColor::bg_magenta(bool bright) {
+	return this->add_code(bright ? 105 : 45);
+}
+LogColor & LogColor::bg_cyan(bool bright) {
+	return this->add_code(bright ? 106 : 46);
+}
+LogColor & LogColor::bg_white(bool bright) {
+	return this->add_code(bright ? 107 : 47);
+}
diff --git a/src/crepe/util/color.h b/src/crepe/util/color.h
new file mode 100644
index 0000000..91e1abe
--- /dev/null
+++ b/src/crepe/util/color.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include <string>
+
+namespace crepe::util {
+
+class LogColor {
+public:
+	LogColor() = default;
+
+public:
+	//! get color code as c-style string (or color content string)
+	const char * c_str(const char * content = NULL);
+	//! color printf-style format string
+	const char * fmt(const char * fmt, ...);
+	//! get color code as stl string (or color content string)
+	const std::string str(const std::string & content = "");
+
+public:
+	//! reset color to default foreground and background color
+	LogColor & reset();
+
+public:
+	LogColor & fg_black(bool bright = false);
+	LogColor & fg_red(bool bright = false);
+	LogColor & fg_green(bool bright = false);
+	LogColor & fg_yellow(bool bright = false);
+	LogColor & fg_blue(bool bright = false);
+	LogColor & fg_magenta(bool bright = false);
+	LogColor & fg_cyan(bool bright = false);
+	LogColor & fg_white(bool bright = false);
+
+public:
+	LogColor & bg_black(bool bright = false);
+	LogColor & bg_red(bool bright = false);
+	LogColor & bg_green(bool bright = false);
+	LogColor & bg_yellow(bool bright = false);
+	LogColor & bg_blue(bool bright = false);
+	LogColor & bg_magenta(bool bright = false);
+	LogColor & bg_cyan(bool bright = false);
+	LogColor & bg_white(bool bright = false);
+
+private:
+	LogColor & add_code(unsigned int code);
+
+private:
+	std::string code = "";
+	std::string final = "";
+};
+
+} // namespace crepe::util
diff --git a/src/crepe/util/fmt.cpp b/src/crepe/util/fmt.cpp
new file mode 100644
index 0000000..8ef1164
--- /dev/null
+++ b/src/crepe/util/fmt.cpp
@@ -0,0 +1,33 @@
+#include <cstdarg>
+#include <cstdio>
+#include <string>
+
+#include "fmt.h"
+
+using namespace std;
+
+string crepe::util::va_stringf(va_list args, const char * fmt) {
+	va_list args_copy;
+	va_copy(args_copy, args);
+
+	size_t sz = vsnprintf(NULL, 0, fmt, args_copy) + 1;
+	char * msg = (char *) malloc(sz);
+	va_end(args_copy);
+
+	vsnprintf(msg, sz, fmt, args);
+
+	string out = msg;
+	free(msg);
+
+	va_end(args);
+
+	return out;
+}
+
+string crepe::util::stringf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	string out = va_stringf(args, fmt);
+	va_end(args);
+	return out;
+}
diff --git a/src/crepe/util/fmt.h b/src/crepe/util/fmt.h
new file mode 100644
index 0000000..44c426f
--- /dev/null
+++ b/src/crepe/util/fmt.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <string>
+
+namespace crepe::util {
+
+std::string va_stringf(va_list args, const char * fmt);
+std::string stringf(const char * fmt, ...);
+
+} // namespace crepe::util
diff --git a/src/crepe/util/log.cpp b/src/crepe/util/log.cpp
new file mode 100644
index 0000000..6bcc4ae
--- /dev/null
+++ b/src/crepe/util/log.cpp
@@ -0,0 +1,53 @@
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+
+#include "../api/Config.h"
+#include "fmt.h"
+#include "log.h"
+
+using namespace crepe::util;
+using namespace std;
+
+string log_prefix(LogLevel level) {
+	switch (level) {
+		case LogLevel::TRACE:
+			return LogColor().fg_white().str("[TRACE]") + " ";
+		case LogLevel::DEBUG:
+			return LogColor().fg_magenta().str("[DEBUG]") + " ";
+		case LogLevel::INFO:
+			return LogColor().fg_blue().str("[INFO]") + " ";
+		case LogLevel::WARNING:
+			return LogColor().fg_yellow().str("[WARN]") + " ";
+		case LogLevel::ERROR:
+			return LogColor().fg_red().str("[ERROR]") + " ";
+	}
+	return "";
+}
+
+static void log(LogLevel level, const string msg) {
+	auto & cfg = crepe::api::Config::get_instance();
+	if (level < cfg.log.level) return;
+
+	string out = log_prefix(level) + msg;
+	if (!out.ends_with("\n")) out += "\n";
+
+	// TODO: also log to file or smth
+	printf("%s", out.c_str());
+	fflush(stdout);
+}
+
+void crepe::util::logf(const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	log(LogLevel::DEBUG, va_stringf(args, fmt));
+	va_end(args);
+}
+
+void crepe::util::logf(LogLevel level, const char * fmt, ...) {
+	va_list args;
+	va_start(args, fmt);
+	log(level, va_stringf(args, fmt));
+	va_end(args);
+}
diff --git a/src/crepe/util/log.h b/src/crepe/util/log.h
new file mode 100644
index 0000000..308ba96
--- /dev/null
+++ b/src/crepe/util/log.h
@@ -0,0 +1,40 @@
+#pragma once
+
+// allow user to disable debug macros
+#ifndef CREPE_DISABLE_MACROS
+
+#include "color.h"
+
+// utility macros
+#define _crepe_logf_here(level, format, ...) \
+	crepe::util::logf( \
+		level, "%s" format, \
+		crepe::util::LogColor().fg_white(false).fmt( \
+			"%s (%s:%d)", __PRETTY_FUNCTION__, __FILE_NAME__, __LINE__), \
+		__VA_ARGS__)
+
+// very illegal global function-style macros
+// NOLINTBEGIN
+#define dbg_logf(fmt, ...) \
+	_crepe_logf_here(crepe::util::LogLevel::DEBUG, ": " fmt, __VA_ARGS__)
+#define dbg_log(str) \
+	_crepe_logf_here(crepe::util::LogLevel::DEBUG, "%s: " str, "")
+#define dbg_trace() _crepe_logf_here(crepe::util::LogLevel::TRACE, "%s", "")
+// NOLINTEND
+
+#endif
+
+namespace crepe::util {
+
+enum LogLevel {
+	TRACE,
+	DEBUG,
+	INFO,
+	WARNING,
+	ERROR,
+};
+
+void logf(const char * fmt, ...);
+void logf(enum LogLevel level, const char * fmt, ...);
+
+} // namespace crepe::util