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imgcat.go
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imgcat.go
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// Package imgcat provides helpers for embedding images (gif, png, jpeg)
// in the terminal output as suppored by iTerm 2.9+
// and documented at https://www.iterm2.com/images.html
package imgcat
import (
"bytes"
"encoding/base64"
"fmt"
"image"
"image/png"
"io"
"os"
)
// Cat embeds given io.Reader in the given io.Writer
func Cat(r io.Reader, w io.Writer) error {
return embed(r, w)
}
// CatImage embeds given image.Image in the given io.Writer
func CatImage(i image.Image, w io.Writer) error {
b, err := imageAsPngBytes(i)
if err != nil {
return err
}
return embed(b, w)
}
// CatFile embeds image file in the given io.Writer
func CatFile(fileName string, w io.Writer) error {
r, err := os.Open(fileName)
if err != nil {
return err
}
return embed(r, w)
}
func embed(r io.Reader, w io.Writer) error {
inScreen := os.Getenv("TERM") == "screen"
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(r)
if err != nil {
return err
}
// tmux requires unrecognized OSC sequences to be wrapped with DCS tmux;
// <sequence> ST, and for all ESCs in <sequence> to be replaced with ESC ESC. It
// only accepts ESC backslash for ST.
if inScreen {
fmt.Fprint(w, "\033Ptmux;\033")
}
fmt.Fprint(w, "\033]1337;File=;inline=1:")
encoder := base64.NewEncoder(base64.StdEncoding, w)
_, err = encoder.Write(buf.Bytes())
if err != nil {
return err
}
encoder.Close()
fmt.Fprintln(w, "\a")
if inScreen {
fmt.Fprintln(w, "\033\\")
}
return nil
}
func imageAsPngBytes(i image.Image) (io.Reader, error) {
buf := new(bytes.Buffer)
err := png.Encode(buf, i)
if err != nil {
return nil, err
}
return buf, nil
}