Add basic logging functionality

src/log/log.c

@@ -0,0 +1,99 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#include "log.h"
+#include "../common/aliases/aliases.h"
+#include "../common/assert/assert.h"
+#include "../os/file/file.h"
+
+#define LOG_LEVEL_STR_LENGTH 8
+#define LOG_PREFIX_BUF_LENGTH 16
+
+typedef struct {
+	WFile *outlog;
+	WFile *errlog;
+	LogLevel level;
+} LogConfig;
+
+wapp_intern LogConfig LOG_CONFIG = {
+	.level = WAPP_LOG_DEBUG,
+};
+wapp_intern Str8RO LOG_LEVEL_STRINGS[COUNT_LOG_LEVEL] = {
+	[WAPP_LOG_FATAL]    = wapp_str8_lit_ro_initialiser_list("[ FATAL    ] "),
+	[WAPP_LOG_CRITICAL] = wapp_str8_lit_ro_initialiser_list("[ CRITICAL ] "),
+	[WAPP_LOG_ERROR]    = wapp_str8_lit_ro_initialiser_list("[ ERROR    ] "),
+	[WAPP_LOG_WARNING]  = wapp_str8_lit_ro_initialiser_list("[ WARNING  ] "),
+	[WAPP_LOG_INFO]     = wapp_str8_lit_ro_initialiser_list("[ INFO     ] "),
+	[WAPP_LOG_DEBUG]    = wapp_str8_lit_ro_initialiser_list("[ DEBUG    ] "),
+};
+
+wapp_intern void _write_log_line(WFile *fp, const Logger *logger, Str8 msg, LogLevel level);
+
+void wapp_log_set_level(LogLevel level) {
+	LOG_CONFIG.level = level;
+}
+
+void wapp_log_configure(WFile *outlog, WFile *errlog, LogLevel level) {
+	LOG_CONFIG.outlog = outlog;
+	LOG_CONFIG.errlog = errlog;
+	LOG_CONFIG.level  = level;
+}
+
+Logger wapp_log_make_logger(Str8 name) {
+	return (Logger){ .name = name };
+}
+
+void wapp_log_debug(const Logger *logger, Str8 msg) {
+	wapp_debug_assert(logger != NULL, "`logger` should not be NULL");
+	if (LOG_CONFIG.level < WAPP_LOG_DEBUG) { return; }
+
+	WFile *fp = LOG_CONFIG.outlog != NULL ? LOG_CONFIG.outlog : wapp_file_stdout();
+	_write_log_line(fp, logger, msg, WAPP_LOG_DEBUG);
+}
+
+void wapp_log_info(const Logger *logger, Str8 msg) {
+	wapp_debug_assert(logger != NULL, "`logger` should not be NULL");
+	if (LOG_CONFIG.level < WAPP_LOG_INFO) { return; }
+
+	WFile *fp = LOG_CONFIG.outlog != NULL ? LOG_CONFIG.outlog : wapp_file_stdout();
+	_write_log_line(fp, logger, msg, WAPP_LOG_INFO);
+}
+
+void wapp_log_warning(const Logger *logger, Str8 msg) {
+	wapp_debug_assert(logger != NULL, "`logger` should not be NULL");
+	if (LOG_CONFIG.level < WAPP_LOG_WARNING) { return; }
+
+	WFile *fp = LOG_CONFIG.outlog != NULL ? LOG_CONFIG.outlog : wapp_file_stdout();
+	_write_log_line(fp, logger, msg, WAPP_LOG_WARNING);
+}
+
+void wapp_log_error(const Logger *logger, Str8 msg) {
+	wapp_debug_assert(logger != NULL, "`logger` should not be NULL");
+	if (LOG_CONFIG.level < WAPP_LOG_ERROR) { return; }
+
+	WFile *fp = LOG_CONFIG.errlog != NULL ? LOG_CONFIG.errlog : wapp_file_stderr();
+	_write_log_line(fp, logger, msg, WAPP_LOG_ERROR);
+}
+
+void wapp_log_critical(const Logger *logger, Str8 msg) {
+	wapp_debug_assert(logger != NULL, "`logger` should not be NULL");
+	if (LOG_CONFIG.level < WAPP_LOG_CRITICAL) { return; }
+
+	WFile *fp = LOG_CONFIG.errlog != NULL ? LOG_CONFIG.errlog : wapp_file_stderr();
+	_write_log_line(fp, logger, msg, WAPP_LOG_CRITICAL);
+}
+
+void wapp_log_fatal(const Logger *logger, Str8 msg) {
+	wapp_debug_assert(logger != NULL, "`logger` should not be NULL");
+	if (LOG_CONFIG.level < WAPP_LOG_FATAL) { return; }
+
+	WFile *fp = LOG_CONFIG.errlog != NULL ? LOG_CONFIG.errlog : wapp_file_stderr();
+	_write_log_line(fp, logger, msg, WAPP_LOG_FATAL);
+}
+
+wapp_intern void _write_log_line(WFile *fp, const Logger *logger, Str8 msg, LogLevel level) {
+	wapp_file_write((void *)LOG_LEVEL_STRINGS[level].buf, fp, LOG_LEVEL_STRINGS[level].size);
+	wapp_file_write((void *)logger->name.buf, fp, logger->name.size);
+	wapp_file_write((void *)": ", fp, 2);
+	wapp_file_write((void *)msg.buf, fp, msg.size);
+	wapp_file_write((void *)"\n", fp, 1);
+}

src/log/log.h

@@ -0,0 +1,34 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef LOG_H
+#define LOG_H
+
+#include "../os/file/file.h"
+#include "../base/strings/str8/str8.h"
+
+typedef enum {
+	WAPP_LOG_FATAL,
+	WAPP_LOG_CRITICAL,
+	WAPP_LOG_ERROR,
+	WAPP_LOG_WARNING,
+	WAPP_LOG_INFO,
+	WAPP_LOG_DEBUG,
+
+	COUNT_LOG_LEVEL,
+} LogLevel;
+
+typedef struct {
+	Str8 name;
+} Logger;
+
+void wapp_log_set_level(LogLevel level);
+void wapp_log_configure(WFile *outlog, WFile *errlog, LogLevel level);
+Logger wapp_log_make_logger(Str8 name);
+void wapp_log_debug(const Logger *logger, Str8 msg);
+void wapp_log_info(const Logger *logger, Str8 msg);
+void wapp_log_warning(const Logger *logger, Str8 msg);
+void wapp_log_error(const Logger *logger, Str8 msg);
+void wapp_log_critical(const Logger *logger, Str8 msg);
+void wapp_log_fatal(const Logger *logger, Str8 msg);
+
+#endif // !LOG_H

src/log/wapp_log.c

@@ -0,0 +1,10 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef WAPP_LOG_C
+#define WAPP_LOG_C
+
+#include "log.c"
+#include "../base/wapp_base.c"
+#include "../os/wapp_os.c"
+
+#endif // !WAPP_LOG_C

src/log/wapp_log.h

@@ -0,0 +1,11 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef WAPP_LOG_H
+#define WAPP_LOG_H
+
+#include "log.h"
+#include "../common/wapp_common.h"
+#include "../base/wapp_base.h"
+#include "../os/wapp_os.h"
+
+#endif // !WAPP_LOG_H

src/os/file/file.h

@@ -34,9 +34,18 @@ typedef enum {
 	FILE_SEEK_ORIGIN_COUNT,
 } FileSeekOrigin;
 
+// Return value should not be cached as it's not guaranteed to remain the same. Always call
+// wapp_file_stdin to get the standard input stream
 wapp_extern WFile *wapp_file_stdin(void);
+
+// Return value should not be cached as it's not guaranteed to remain the same. Always call
+// wapp_file_stdout to get the standard output stream
 wapp_extern WFile *wapp_file_stdout(void);
+
+// Return value should not be cached as it's not guaranteed to remain the same. Always call
+// wapp_file_stderr to get the standard error stream
 wapp_extern WFile *wapp_file_stderr(void);
+
 WFile *wapp_file_open(const Allocator *allocator, Str8RO *filepath, FileAccessMode mode);
 i64    wapp_file_get_current_position(WFile *file);
 i64    wapp_file_seek(WFile *file, i64 offset, FileSeekOrigin origin);

src/os/shell/termcolour/termcolour.h

@@ -12,6 +12,8 @@
 BEGIN_C_LINKAGE
 #endif // !WAPP_PLATFORM_CPP
 
+// TODO (Abdelrahman): Look into moving away from stdio in the implementation
+
 void wapp_shell_termcolour_print_text(Str8RO *text, TerminalColour colour);
 void wapp_shell_termcolour_clear_colour(void);
 

src/wapp.c

@@ -6,8 +6,9 @@
 #include "wapp.h"
 #include "base/wapp_base.c"
 #include "os/wapp_os.c"
+#include "log/wapp_log.c"
 #include "prng/wapp_prng.c"
-#include "uuid/uuid.c"
+#include "uuid/wapp_uuid.c"
 #include "testing/wapp_testing.c"
 
 #endif // !WAPP_C

src/wapp.h

@@ -6,6 +6,7 @@
 #include "common/wapp_common.h"
 #include "base/wapp_base.h"
 #include "os/wapp_os.h"
+#include "log/wapp_log.h"
 #include "prng/wapp_prng.h"
 #include "uuid/wapp_uuid.h"
 #include "testing/wapp_testing.h"