LogNest

A "Header file only" library for logging to files made in C, with focus on simplicity

Installing:

wget https://raw.githubusercontent.com/LeaoMartelo2/LogNest/main/lognest.h

_{just copy this if you are lazy}

Usage:

• Download lognest.h and add it to your project.
• Any specific log level can be disabled with:

#define LOGNEST_DISABLE_TRACE
#define LOGNEST_DISABLE_WARN
#define LOGNEST_DISABLE_ERROR
#define LOGNEST_DISABLE_DEBUG

• Optionally change where the log file is sent to (default: "latest.log") with:

#define LOGNEST_FILE "path/to/log/filename.log"

• Optionally disable the log's timestamp with:

#define LOGNEST_DISABLE_TIMESTAMP

(All configuration defines must come before the implementation define)

• For the library to serve as implementation, add: #define LOGNEST_IMPLEMENTATION before the #include.
• This also means you should only define the implementation in one file. Just including it serves as a header.

Updates:

LogNest 2.1 (August 1st, 2025)

• Renamed some internal functions to avoid name hogging.
• Added the ability to disable the Timestamp on logging.

use:

#define LOGNEST_DISABLE_TIMESTAMP

before defining the implementation.

• Fixed some UX around changing the file being logged to.

you can now do:

#define LOGNEST_FILE "path/to/log/filename.log"

before defining the implementation

LogNest 2.0 (May 7th, 2025)

• Improved compiler compatibility by removing some parts of the code that i didn't knew were GNU extensions.

• Added new Macros for disabling a log level entirely

you can now disable any log level with:

#define LOGNEST_DISABLE_TRACE
#define LOGNEST_DISABLE_WARN
#define LOGNEST_DISABLE_ERROR
#define LOGNEST_DISABLE_DEBUG

That has to be defined before the implementation define, that is already before the #include

• Added a new macro that returns a c literal of the current LogNest version