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|
use std::cmp::Ordering;
use camino::Utf8PathBuf;
pub struct Cli {
pub color_count: u8,
pub tolerance: Option<f32>,
pub input: Utf8PathBuf,
pub in_type: InType,
pub output: Utf8PathBuf,
pub out_type: OutType,
}
// It's not a builder, but I think the builder/building name is useful
// here because it's used while not all things are populated.
#[derive(Debug, Default)]
struct BuildingCli {
pub color_count: Option<u8>,
pub tolerance: Option<f32>,
pub input: Option<Utf8PathBuf>,
pub output: Option<Utf8PathBuf>,
}
impl BuildingCli {
// One minus max
const DEFAULT_COLORS: u8 = 255;
pub fn build_or_die(self, input: &str, output: &str) -> Cli {
let input: Utf8PathBuf = input.into();
let in_type = match input.extension() {
None => {
eprintln!("can't determine input filetype!\nSupported input types: PNG, JPG");
std::process::exit(1);
}
Some("png") => InType::Png,
Some("jpg") | Some("jpeg") => InType::Jpeg,
Some(ext) => {
eprintln!("unknown filetype '{ext}'!\nSupported input types: PNG, JPG");
std::process::exit(1);
}
};
let output: Utf8PathBuf = output.into();
let out_type = match output.extension() {
None => {
eprintln!("can't determine output filetype!");
std::process::exit(1);
}
Some("png") => OutType::Png,
Some("gif") => OutType::Gif,
Some(ext) => {
eprintln!("unknown filetype '{ext}'!\nSupport output types are: GIF, PNG");
std::process::exit(1);
}
};
Cli {
color_count: self.color_count.unwrap_or(Self::DEFAULT_COLORS),
tolerance: self.tolerance,
input,
in_type,
output,
out_type,
}
}
}
pub enum InType {
Jpeg,
Png,
}
pub enum OutType {
Png,
Gif,
}
pub fn build() -> Cli {
let mut free = vec![];
let mut building = BuildingCli::default();
for arg in std::env::args().skip(1) {
// Handle the special cases we want to obey.
// -h/--help are standards and, even though we're playing with a
// dd-style syntax, we want to respect these
if arg == "-h" || arg == "--help" {
print_help()
}
match arg.split_once('=') {
None => free.push(arg),
Some(("colors", value)) | Some(("colours", value)) | Some(("clrs", value)) => {
match value.parse::<usize>() {
Err(_) => {
eprintln!("color must be a whole number > 0 and <= 256");
std::process::exit(1);
}
Ok(count) if count == 0 || count > 256 => {
eprintln!("color must be a whole number >= 1 and <= 256");
std::process::exit(1);
}
Ok(count) => {
//TODO: error if this's been set already?
building.color_count = Some((count - 1) as u8);
}
}
}
Some(("tolerance", value)) | Some(("tol", value)) => match value.parse::<f32>() {
Err(_) => {
eprintln!("tolerance must be > 0.0 and <= 100.0");
std::process::exit(1);
}
Ok(tol) if tol <= 0.0 || tol > 100.0 => {
eprintln!("tolerance must be > 0.0 and <= 100.0");
std::process::exit(1);
}
Ok(tol) => {
//TODO: error if this's been set already
building.tolerance = Some(tol);
}
},
Some(("help", _)) => {
print_help();
}
Some((key, _)) => {
eprintln!("unrecognised key {key}");
std::process::exit(1);
}
}
}
match free.len().cmp(&2) {
Ordering::Less => {
eprintln!("didn't get enough arguments! 'help=' for help");
std::process::exit(1);
}
Ordering::Greater => {
eprintln!("got too many arguments! 'help=' for help");
std::process::exit(1);
}
Ordering::Equal => building.build_or_die(&free[0], &free[1]),
}
}
fn print_help() -> ! {
println!("usage: squash [arguments ...] <input> <output>\n");
println!("<input> path to a jpeg or png file");
println!("<output> path to write a png or gif file to\n");
println!("ARGUMENTS:");
println!(" colors=<int> | clrs=<int>");
println!(" the number of colours the final image should contain");
println!(" a whole number more than 0 and less than, or equal, 256 [Default 256]\n");
println!(" tolerance=<float> | tol=<float>");
println!(" how different colours should be to be added to the palette");
println!(" a number > 0 and <= 100\n");
println!(" help= | -h | --help");
println!(" print this message and exit");
std::process::exit(0)
}
|
