telebit/dbg/dbg.go

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package dbg
import (
"encoding/hex"
"fmt"
"os"
)
// Debug is a flag for whether or not verbose logging should be activated
var Debug bool
var rawBytes bool
var allBytes bool
func init() {
Init()
}
// Init will set debug vars from ENVs and print out whatever is set
func Init() {
if !Debug {
Debug = ("true" == os.Getenv("VERBOSE"))
}
if !allBytes {
allBytes = ("true" == os.Getenv("VERBOSE_BYTES"))
}
if !rawBytes {
rawBytes = ("true" == os.Getenv("VERBOSE_RAW"))
}
if Debug {
fmt.Fprintf(os.Stderr, "DEBUG=true\n")
}
if allBytes || rawBytes {
fmt.Fprintf(os.Stderr, "VERBOSE_BYTES=true\n")
}
if rawBytes {
fmt.Fprintf(os.Stderr, "VERBOSE_RAW=true\n")
}
}
// Trunc will take up to the first and last 20 bytes of the input to product 80 char hex output
func Trunc(b []byte, n int) string {
bin := b[:n]
if allBytes || rawBytes {
if rawBytes {
return string(bin)
}
return hex.EncodeToString(bin)
}
if n > 40 {
return hex.EncodeToString(bin[:19]) + ".." + hex.EncodeToString(bin[n-19:])
}
return hex.EncodeToString(bin)
}