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package main
import (
"bufio"
"fmt"
"golang.org/x/image/draw"
"golang.org/x/term"
"image"
_ "image/jpeg"
_ "image/png"
"os"
)
func load(filename string) (image.Image, error) {
file := os.Stdin
if filename != "-" {
var err error
file, err = os.Open(filename)
if err != nil {
return nil, err
}
defer file.Close()
}
img, _, err := image.Decode(file)
if err != nil {
return nil, fmt.Errorf("decode %q: %s", filename, err)
}
return img, nil
}
func printImg(filename string, cols, lines int) error {
img, err := load(filename)
if err != nil {
return err
}
// Try not to stretch the image.
if img.Bounds().Dy()*cols <= img.Bounds().Dx()*lines*5/2 {
lines = img.Bounds().Dy() * cols / (img.Bounds().Dx() * 5 / 2)
} else {
cols = img.Bounds().Dx() * lines * 5 / 2 / img.Bounds().Dy()
}
dst := image.NewRGBA(image.Rect(0, 0, cols, lines))
draw.ApproxBiLinear.Scale(dst, dst.Bounds(), img, img.Bounds(), draw.Over, nil)
buf := bufio.NewWriter(os.Stdout)
defer buf.Flush()
for y := 0; y < lines; y++ {
for x := 0; x < cols; x++ {
r, g, b, _ := dst.At(x, y).RGBA()
fmt.Fprintf(buf, "\033[48;2;%d;%d;%dm ", r>>8, g>>8, b>>8)
}
fmt.Fprintln(buf, "\033[49m")
}
return nil
}
func icat(args []string) error {
cols, lines, err := term.GetSize(1)
if err != nil {
return fmt.Errorf("terminal size: %s", err)
}
lines-- // Leave a line for the status bar.
if len(args) == 0 {
args = []string{"-"}
}
for _, f := range args {
if err := printImg(f, cols, lines); err != nil {
return err
}
}
return nil
}
func main() {
if err := icat(os.Args[1:]); err != nil {
fmt.Fprintf(os.Stderr, "Failed: %s\n", err)
os.Exit(1)
}
}
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