// Package pretty provides pretty-printing for Go values. This is

// useful during debugging, to avoid wrapping long output lines in

// the terminal.

//

// It provides a function, Formatter, that can be used with any

// function that accepts a format string. It also provides

// convenience wrappers for functions in packages fmt and log.

package pretty

import (

	"fmt"

	"io"

	"log"

	"reflect"

)

// Errorf is a convenience wrapper for fmt.Errorf.

//

// Calling Errorf(f, x, y) is equivalent to

// fmt.Errorf(f, Formatter(x), Formatter(y)).

func Errorf(format string, a ...interface{}) error {

	return fmt.Errorf(format, wrap(a, false)...)

}

// Fprintf is a convenience wrapper for fmt.Fprintf.

//

// Calling Fprintf(w, f, x, y) is equivalent to

// fmt.Fprintf(w, f, Formatter(x), Formatter(y)).

func Fprintf(w io.Writer, format string, a ...interface{}) (n int, error error) {

	return fmt.Fprintf(w, format, wrap(a, false)...)

}

// Log is a convenience wrapper for log.Printf.

//

// Calling Log(x, y) is equivalent to

// log.Print(Formatter(x), Formatter(y)), but each operand is

// formatted with "%# v".

func Log(a ...interface{}) {

	log.Print(wrap(a, true)...)

}

// Logf is a convenience wrapper for log.Printf.

//

// Calling Logf(f, x, y) is equivalent to

// log.Printf(f, Formatter(x), Formatter(y)).

func Logf(format string, a ...interface{}) {

	log.Printf(format, wrap(a, false)...)

}

// Logln is a convenience wrapper for log.Printf.

//

// Calling Logln(x, y) is equivalent to

// log.Println(Formatter(x), Formatter(y)), but each operand is

// formatted with "%# v".

func Logln(a ...interface{}) {

	log.Println(wrap(a, true)...)

}

// Print pretty-prints its operands and writes to standard output.

//

// Calling Print(x, y) is equivalent to

// fmt.Print(Formatter(x), Formatter(y)), but each operand is

// formatted with "%# v".

func Print(a ...interface{}) (n int, errno error) {

	return fmt.Print(wrap(a, true)...)

}

// Printf is a convenience wrapper for fmt.Printf.

//

// Calling Printf(f, x, y) is equivalent to

// fmt.Printf(f, Formatter(x), Formatter(y)).

func Printf(format string, a ...interface{}) (n int, errno error) {

	return fmt.Printf(format, wrap(a, false)...)

}

// Println pretty-prints its operands and writes to standard output.

//

// Calling Print(x, y) is equivalent to

// fmt.Println(Formatter(x), Formatter(y)), but each operand is

// formatted with "%# v".

func Println(a ...interface{}) (n int, errno error) {

	return fmt.Println(wrap(a, true)...)

}

// Sprint is a convenience wrapper for fmt.Sprintf.

//

// Calling Sprint(x, y) is equivalent to

// fmt.Sprint(Formatter(x), Formatter(y)), but each operand is

// formatted with "%# v".

func Sprint(a ...interface{}) string {

	return fmt.Sprint(wrap(a, true)...)

}

// Sprintf is a convenience wrapper for fmt.Sprintf.

//

// Calling Sprintf(f, x, y) is equivalent to

// fmt.Sprintf(f, Formatter(x), Formatter(y)).

func Sprintf(format string, a ...interface{}) string {

	return fmt.Sprintf(format, wrap(a, false)...)

}

func wrap(a []interface{}, force bool) []interface{} {

	w := make([]interface{}, len(a))

	for i, x := range a {

		w[i] = formatter{v: reflect.ValueOf(x), force: force}

	}

	return w

}