Less "wall of text"-y slog handler; mainly for dev/testing.

I've seen so many apps that will just spit walls and walls of text on error failures and trying to get something meaningful out of it is like manually digging through War & Peace to find that one 6-word quote.

I don't know why all these go loggers have such terrible output by default; Just printing things a bit aligned makes such a world of difference. I must've written a handler like this 5 or 6 times for different loggers over the years by now.

Default handler:

2024/03/23 07:21:02 ERROR error
2024/03/23 07:21:02 WARN warn
2024/03/23 07:21:02 INFO info
2024/03/23 07:21:02 ERROR error str=foo int=123 map="map[another:true key:value struct:{s:[1 2 3]}]" slice="[a b]" struct="{s:asd i:123}"
2024/03/23 07:21:02 WARN warn str=foo int=123 map="map[another:true key:value struct:{s:[1 2 3]}]" slice="[a b]" struct="{s:asd i:123}"
2024/03/23 07:21:02 INFO info str=foo int=123 map="map[another:true key:value struct:{s:[1 2 3]}]" slice="[a b]" struct="{s:asd i:123}"

slog_align:

07:25 ERROR error                                                                       main/main.go:13
07:25 WARN  warn                                                                        main/main.go:14
07:25 INFO  info                                                                        main/main.go:15
07:25 DEBUG debug                                                                       main/main.go:16
07:25 ERROR error                                                                       main/main.go:32
            str    = foo
            int    = 123
            map    = map[another:true key:value struct:{[1 2 3]}]
            slice  = [a b]
            struct = {asd 123}
07:25 WARN  warn                                                                        main/main.go:33
            str    = foo
            int    = 123
            map    = map[another:true key:value struct:{[1 2 3]}]
            slice  = [a b]
            struct = {asd 123}
07:25 INFO  info                                                                        main/main.go:34
            str    = foo
            int    = 123
            map    = map[another:true key:value struct:{[1 2 3]}]
            slice  = [a b]
            struct = {asd 123}
07:25 DEBUG debug                                                                       main/main.go:35
            str    = foo
            int    = 123
            map    = map[another:true key:value struct:{[1 2 3]}]
            slice  = [a b]
            struct = {asd 123}

---

Use it as:

l := slog.New(slog_align.NewAlignedHandler(os.Stdout, nil))
l.Info("yo yo")

Or globally:

slog.SetDefault(slog.New(slog_align.NewAlignedHandler(os.Stdout, nil)))
slog.Info("yo yo")