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#![feature(box_syntax)]
pub mod color;
use anyhow::Result;
use color::Color;
use std::{
env,
f64::consts::PI,
fs::File,
io::{stdin, BufRead, BufReader, Read},
process::exit,
};
static HELP: &str = "
Usage: blubcat PATTERN [FILE]...
Concatenate FILE(s) to standard output, colorizing the output according to OPTION(s).
With no FILE, or when FILE is -, the standard input is read.
If PATTERN is repeated only the last one will be used.
PATTERN:
-R --rainbow Rainbow
-S --sequence <c1,c2,c3,...> Sequences colors on the X-axis
-G --gradient <c1,c2,c3,...> Interpolates the colors on the X-axis
<PATTERN> <TRANSFORM> Apply TRANSFORM to PATTERN
<PRESET>
TRANSFORM:
-r --rotate <angle>
-s --scale <factor>
-m --matrix <x> <y> <z> <w>
PRESET:
-P --pride Pride flag
COLOR:
<rrggbb>
black white red green blue yellow cyan magenta
";
fn main() -> Result<()> {
let mut args = env::args().skip(1);
let mut pat: Box<dyn Sample2D> = box Solid(Color::WHITE);
loop {
let a = args.next();
let mut arg_next = || args.next();
let mut arg_num = || {
arg_next()
.expect("value expected")
.parse::<f64>()
.expect("not a number")
};
if let Some(a) = a {
if !a.starts_with("-") || a == "--" || a == "-" {
break;
}
match a.as_str() {
"-?" | "--help" => {
println!("{}", HELP);
exit(0)
}
/* PRESETS */
"-P" | "--pride" => {
pat = box Transform {
matrix: ((1.0 / 12.0, 1.0 / 12.0), (0.0, 0.0)),
inner: box Extend(box Sequence(vec![
Color::parse("e50000").unwrap(),
Color::parse("ff8d00").unwrap(),
Color::parse("ffee00").unwrap(),
Color::parse("028121").unwrap(),
Color::parse("004cff").unwrap(),
Color::parse("770088").unwrap(),
])),
}
}
/* PATTERNS */
"-R" | "--rainbow" => pat = box Extend(box Rainbow),
"-S" | "--sequence" => {
pat = box Extend(box Sequence(
arg_next()
.unwrap()
.split(",")
.map(|e| Color::parse(e).expect("color invalid"))
.collect::<Vec<_>>(),
))
}
"-G" | "--gradient" => {
pat = box Extend(box Gradient(
arg_next()
.unwrap()
.split(",")
.map(|e| Color::parse(e).expect("color invalid"))
.collect::<Vec<_>>(),
))
}
/* TRANSFORMS */
"-s" | "--scale" => {
let fac = arg_num();
pat = box Transform {
inner: pat,
matrix: ((fac, 0.0), (0.0, fac)),
}
}
"-r" | "--rotate" => {
let angle = arg_num() * PI * 2.0;
pat = box Transform {
inner: pat,
matrix: ((angle.cos(), -angle.sin()), (angle.sin(), angle.cos())),
}
}
"-m" | "--matrix" => {
pat = box Transform {
inner: pat,
matrix: ((arg_num(), arg_num()), (arg_num(), arg_num())),
}
}
_ => panic!("unknown option {}", &a),
}
} else {
break;
}
}
let inputs = args.collect::<Vec<String>>();
if inputs.len() == 0 {
colorize(stdin(), &mut pat)?
} else {
for f in inputs {
let file = File::open(f)?;
colorize(file, &mut pat)?;
}
}
Ok(())
}
fn colorize(file: impl Read, sampler: &mut Box<dyn Sample2D>) -> Result<()> {
let mut file = BufReader::new(file);
let mut line = String::new();
for y in 0.. {
if file.read_line(&mut line)? == 0 {
break;
}
for (x, c) in line.chars().enumerate() {
let (r, g, b) = sampler.sample(x as f64, y as f64).as_rgb888();
print!("\x1b[38;2;{r};{g};{b}m{c}")
}
line.clear();
}
Ok(())
}
trait Sample2D {
fn sample(&mut self, x: f64, y: f64) -> Color;
}
trait Sample1D {
fn sample(&mut self, x: f64) -> Color;
}
struct Extend(Box<dyn Sample1D>);
impl Sample2D for Extend {
fn sample(&mut self, x: f64, _y: f64) -> Color {
self.0.sample(x)
}
}
struct Transform {
pub inner: Box<dyn Sample2D>,
pub matrix: ((f64, f64), (f64, f64)),
}
impl Sample2D for Transform {
fn sample(&mut self, x: f64, y: f64) -> Color {
let (x, y) = (
x * self.matrix.0 .0 + y * self.matrix.0 .1,
x * self.matrix.1 .0 + y * self.matrix.1 .1,
);
self.inner.sample(x, y)
}
}
struct Rainbow;
impl Sample1D for Rainbow {
fn sample(&mut self, x: f64) -> Color {
static PI: f64 = 3.14;
let x = x * PI * 2.0;
return Color {
r: (x + PI / 3.0 * 0.0).sin() * 0.5 + 0.5,
g: (x + PI / 3.0 * 2.0).sin() * 0.5 + 0.5,
b: (x + PI / 3.0 * 4.0).sin() * 0.5 + 0.5,
};
}
}
struct Sequence(pub Vec<Color>);
impl Sample1D for Sequence {
fn sample(&mut self, x: f64) -> Color {
self.0[(x * self.0.len() as f64).floor() as usize % self.0.len()]
}
}
struct Gradient(pub Vec<Color>);
impl Sample1D for Gradient {
fn sample(&mut self, x: f64) -> Color {
let index = x * self.0.len() as f64;
let index_int = index.floor() as usize;
let index_error = index % 1.0;
let a = self.0[index_int % self.0.len()];
let b = self.0[(index_int + 1) % self.0.len()];
Color::mix(a, b, index_error)
}
}
struct Solid(Color);
impl Sample2D for Solid {
fn sample(&mut self, _x: f64, _y: f64) -> Color {
self.0
}
}
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