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package qrterminal
import (
"io"
"strings"
"rsc.io/qr"
)
const WHITE = "\033[47m \033[0m"
const BLACK = "\033[40m \033[0m"
// Use ascii blocks to form the QR Code
const BLACK_WHITE = "▄"
const BLACK_BLACK = " "
const WHITE_BLACK = "▀"
const WHITE_WHITE = "█"
// Level - the QR Code's redundancy level
const H = qr.H
const M = qr.M
const L = qr.L
// default is 4-pixel-wide white quiet zone
const QUIET_ZONE = 4
//Config for generating a barcode
type Config struct {
Level qr.Level
Writer io.Writer
HalfBlocks bool
BlackChar string
BlackWhiteChar string
WhiteChar string
WhiteBlackChar string
QuietZone int
}
func (c *Config) writeFullBlocks(w io.Writer, code *qr.Code) {
white := c.WhiteChar
black := c.BlackChar
// Frame the barcode in a 1 pixel border
w.Write([]byte(stringRepeat(stringRepeat(white,
code.Size+c.QuietZone*2)+"\n", c.QuietZone))) // top border
for i := 0; i <= code.Size; i++ {
w.Write([]byte(stringRepeat(white, c.QuietZone))) // left border
for j := 0; j <= code.Size; j++ {
if code.Black(j, i) {
w.Write([]byte(black))
} else {
w.Write([]byte(white))
}
}
w.Write([]byte(stringRepeat(white, c.QuietZone-1) + "\n")) // right border
}
w.Write([]byte(stringRepeat(stringRepeat(white,
code.Size+c.QuietZone*2)+"\n", c.QuietZone-1))) // bottom border
}
func (c *Config) writeHalfBlocks(w io.Writer, code *qr.Code) {
ww := c.WhiteChar
bb := c.BlackChar
wb := c.WhiteBlackChar
bw := c.BlackWhiteChar
// Frame the barcode in a 4 pixel border
// top border
if c.QuietZone%2 != 0 {
w.Write([]byte(stringRepeat(bw, code.Size+c.QuietZone*2) + "\n"))
w.Write([]byte(stringRepeat(stringRepeat(ww,
code.Size+c.QuietZone*2)+"\n", c.QuietZone/2)))
} else {
w.Write([]byte(stringRepeat(stringRepeat(ww,
code.Size+c.QuietZone*2)+"\n", c.QuietZone/2)))
}
for i := 0; i <= code.Size; i += 2 {
w.Write([]byte(stringRepeat(ww, c.QuietZone))) // left border
for j := 0; j <= code.Size; j++ {
next_black := false
if i+1 < code.Size {
next_black = code.Black(j, i+1)
}
curr_black := code.Black(j, i)
if curr_black && next_black {
w.Write([]byte(bb))
} else if curr_black && !next_black {
w.Write([]byte(bw))
} else if !curr_black && !next_black {
w.Write([]byte(ww))
} else {
w.Write([]byte(wb))
}
}
w.Write([]byte(stringRepeat(ww, c.QuietZone-1) + "\n")) // right border
}
// bottom border
if c.QuietZone%2 == 0 {
w.Write([]byte(stringRepeat(stringRepeat(ww,
code.Size+c.QuietZone*2)+"\n", c.QuietZone/2-1)))
w.Write([]byte(stringRepeat(wb, code.Size+c.QuietZone*2) + "\n"))
} else {
w.Write([]byte(stringRepeat(stringRepeat(ww,
code.Size+c.QuietZone*2)+"\n", c.QuietZone/2)))
}
}
func stringRepeat(s string, count int) string {
if count <= 0 {
return ""
}
return strings.Repeat(s, count)
}
// GenerateWithConfig expects a string to encode and a config
func GenerateWithConfig(text string, config Config) {
if config.QuietZone < 1 {
config.QuietZone = 1 // at least 1-pixel-wide white quiet zone
}
w := config.Writer
code, _ := qr.Encode(text, config.Level)
if config.HalfBlocks {
config.writeHalfBlocks(w, code)
} else {
config.writeFullBlocks(w, code)
}
}
// Generate a QR Code and write it out to io.Writer
func Generate(text string, l qr.Level, w io.Writer) {
config := Config{
Level: l,
Writer: w,
BlackChar: BLACK,
WhiteChar: WHITE,
QuietZone: QUIET_ZONE,
}
GenerateWithConfig(text, config)
}
// Generate a QR Code with half blocks and write it out to io.Writer
func GenerateHalfBlock(text string, l qr.Level, w io.Writer) {
config := Config{
Level: l,
Writer: w,
HalfBlocks: true,
BlackChar: BLACK_BLACK,
WhiteBlackChar: WHITE_BLACK,
WhiteChar: WHITE_WHITE,
BlackWhiteChar: BLACK_WHITE,
QuietZone: QUIET_ZONE,
}
GenerateWithConfig(text, config)
}
|
