use anyhow::Result;
use base64::{engine, Engine};
use image::{imageops::FilterType, DynamicImage};
use libc::{ioctl, winsize, STDOUT_FILENO, TIOCGWINSZ};
use std::env;
use std::io::Cursor;
pub struct ITermBackend {}
impl ITermBackend {
pub fn new() -> Self {
ITermBackend {}
}
pub fn supported() -> bool {
let term_program = env::var("TERM_PROGRAM").unwrap_or_else(|_| "".to_string());
term_program == "iTerm.app"
}
}
impl Default for ITermBackend {
fn default() -> Self {
Self::new()
}
}
impl super::ImageBackend for ITermBackend {
fn add_image(
&self,
lines: Vec<String>,
image: &DynamicImage,
_colors: usize,
) -> Result<String> {
let tty_size = unsafe {
let tty_size: winsize = std::mem::zeroed();
ioctl(STDOUT_FILENO, TIOCGWINSZ, &tty_size);
tty_size
};
let width_ratio = f64::from(tty_size.ws_col) / f64::from(tty_size.ws_xpixel);
let height_ratio = f64::from(tty_size.ws_row) / f64::from(tty_size.ws_ypixel);
let image = image.resize(
u32::max_value(),
(lines.len() as f64 / height_ratio) as u32,
FilterType::Lanczos3,
);
let _image_columns = width_ratio * f64::from(image.width());
let image_rows = height_ratio * f64::from(image.height());
let mut bytes: Vec<u8> = Vec::new();
image.write_to(&mut Cursor::new(&mut bytes), image::ImageOutputFormat::Png)?;
let encoded_image = engine::general_purpose::STANDARD.encode(bytes);
let mut image_data = Vec::<u8>::new();
image_data.extend(b"\x1B]1337;File=inline=1:");
image_data.extend(encoded_image.bytes());
image_data.extend(b"\x07");
image_data.extend(format!("\x1B[{}A", image_rows as u32 - 1).as_bytes()); let mut i = 0;
for line in &lines {
image_data.extend(format!("\x1B[s{}\x1B[u\x1B[1B", line).as_bytes());
i += 1;
}
image_data
.extend(format!("\n\x1B[{}B", lines.len().max(image_rows as usize) - i).as_bytes());
Ok(String::from_utf8(image_data)?)
}
}