devslog

Package devslog provides a log/slog handler that formats records where message is followed by each of it's attributes on seperate lines.

It implements the slog.Handler interface to format the record's message.

The default slog.TextHandler output adds year/month/date which I rarely find useful when working on code locally. This is what slog.TextHandler default output looks like:

2022/11/08 15:28:26 INFO hello count=3 method=GET request=http://example.com

This package turns the above message into this:

15:28:26 INFO hello
 ↳ count: 3
 ↳ method: GET
 ↳ request: http://example.com

The devslog handler can be set as the default logger with:

devslog.SetDefault(os.Stdout, &slog.HandlerOptions{
    Level: slog.LevelDebug,
})

The top-level slog functions slog.Info, slog.Debug, etc will all use this handler to format the records. SetDefault also updates the default logger used by the log package, so that existing applications that use log.Printf and related functions will send log records to the logger's handler without needing to be rewritten.