Description

Package dbg is a println/printf/log-debugging utility library.

import (
    Dbg "github.com/robertkrimen/dbg"
)

dbg, dbgf := Dbg.New()

dbg("Emit some debug stuff", []byte{120, 121, 122, 122, 121}, math.Pi)
# "2013/01/28 16:50:03 Emit some debug stuff [120 121 122 122 121] 3.141592653589793"

dbgf("With a %s formatting %.2f", "little", math.Pi)
# "2013/01/28 16:51:55 With a little formatting (3.14)"

dbgf("%/fatal//A fatal debug statement: should not be here")
# "A fatal debug statement: should not be here"
# ...and then, os.Exit(1)

dbgf("%/panic//Can also panic %s", "this")
# "Can also panic this"
# ...as a panic, equivalent to: panic("Can also panic this")

dbgf("Any %s arguments without a corresponding %%", "extra", "are treated like arguments to dbg()")
# "2013/01/28 17:14:40 Any extra arguments (without a corresponding %) are treated like arguments to dbg()"

dbgf("%d %d", 1, 2, 3, 4, 5)
# "2013/01/28 17:16:32 Another example: 1 2 3 4 5"

dbgf("%@: Include the function name for a little context (via %s)", "%@")
# "2013... github.com/robertkrimen/dbg.TestSynopsis: Include the function name for a little context (via %@)"

By default, dbg uses log (log.Println, log.Printf, log.Panic, etc.) for output. However, you can also provide your own output destination by invoking dbg.New with a customization function:

import (
    "bytes"
    Dbg "github.com/robertkrimen/dbg"
    "os"
)

# dbg to os.Stderr
dbg, dbgf := Dbg.New(func(dbgr *Dbgr) {
    dbgr.SetOutput(os.Stderr)
})

# A slightly contrived example:
var buffer bytes.Buffer
dbg, dbgf := New(func(dbgr *Dbgr) {
    dbgr.SetOutput(&buffer)
})

dbg is referenced in 2 repositories

github.com/robertkrimen/otto

...