feat: add simple logging library

include/cli.h

@@ -3,23 +3,25 @@
 #include <stdio.h>
 #include "optional.h"
 
-struct cli_options {
+typedef struct {
     optional_str file;
     int verbosity;
     bool help;
     bool version;
-};
+    bool use_colors;
+    optional_str log_file;
+} cli_options;
 
 // Construct a new cli_options struct instance.
-struct cli_options new_options();
+cli_options new_options();
 
 // Delete a cli_options struct instance.
-void free_options(struct cli_options v);
+void free_options(cli_options v);
 
 // Print the help message.
 void print_help(FILE * out, char* prog_name);
 
 // Parse the command line arguments and give a new cli_options struct instance.
-struct cli_options parse(int argc, char** argv);
+cli_options parse(int argc, char** argv);
 
 #endif

include/log.h

@@ -0,0 +1,28 @@
+#ifndef SCI_LOG_H
+#define SCI_LOG_H
+#include <stdarg.h>
+#include <stdio.h>
+
+// TODO: Thread safety!
+enum {
+    LOG_TRACE = 4,
+    LOG_INFO = 3,
+    LOG_WARN = 2,
+    LOG_ERROR = 1,
+    LOG_NOTHING = 0
+};
+typedef struct {
+    int level;
+    bool use_colors;
+    FILE* out_file;
+} log_settings;
+
+void log_log(const char* file, int line, int level, const char* fmt, ...);
+void log_init(log_settings settings);
+
+#define log_trace(...) log_log(__FILE__, __LINE__, LOG_TRACE, __VA_ARGS__)
+#define log_info(...)  log_log( __FILE__, __LINE__, LOG_INFO, __VA_ARGS__)
+#define log_warn(...)  log_log( __FILE__, __LINE__, LOG_WARN, __VA_ARGS__)
+#define log_error(...) log_log(__FILE__, __LINE__, LOG_ERROR, __VA_ARGS__)
+
+#endif