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use std::{
error::Error,
fs,
io::{self, Read},
path::PathBuf,
};
use lazy_static::lazy_static;
use structopt::StructOpt;
use corewars_parser as parser;
use corewars_sim::Core;
lazy_static! {
static ref IO_SENTINEL: PathBuf = PathBuf::from("-");
}
#[derive(Debug, StructOpt)]
#[structopt(rename_all = "kebab")]
struct CliOptions {
#[structopt(subcommand)]
command: Command,
#[structopt(long, short)]
verbose: bool,
#[structopt(parse(from_os_str))]
input_file: PathBuf,
}
#[derive(Debug, StructOpt)]
enum Command {
#[structopt(name = "dump")]
Dump {
#[structopt(long, short, parse(from_os_str), default_value = IO_SENTINEL.to_str().unwrap())]
output_file: PathBuf,
#[structopt(long, short = "E")]
no_expand: bool,
},
#[structopt(name = "run")]
Run {
#[structopt(long, short)]
max_cycles: Option<usize>,
},
}
pub fn run() -> Result<(), Box<dyn Error>> {
let cli_options = CliOptions::from_args();
let mut input = String::new();
if cli_options.input_file == *IO_SENTINEL {
io::stdin().read_to_string(&mut input)?;
} else {
input = fs::read_to_string(cli_options.input_file)?;
}
let parsed_core = match parser::parse(input.as_str()) {
parser::Result::Ok(warrior, warnings) => {
print_warnings(&warnings);
Ok(warrior)
}
parser::Result::Err(err, warnings) => {
print_warnings(&warnings);
Err(err)
}
}?;
match cli_options.command {
Command::Dump {
output_file,
no_expand,
} => {
if no_expand {
unimplemented!()
}
if output_file == *IO_SENTINEL {
println!("{parsed_core}");
} else {
fs::write(output_file, format!("{parsed_core}\n"))?;
};
}
Command::Run { max_cycles } => {
let mut core = Core::default();
core.load_warrior(&parsed_core)?;
match core.run(max_cycles) {
Ok(_) => println!(
"Warrior stopped after {}max of {} cycles",
if max_cycles.is_some() {
"specified "
} else {
""
},
core.steps_taken()
),
Err(err) => println!("Warrior failed after {} steps: {err}", core.steps_taken()),
}
if cli_options.verbose {
println!("Core after execution:\n{core}");
}
}
};
Ok(())
}
fn print_warnings(warnings: &[parser::Warning]) {
for warning in warnings.iter() {
eprintln!("Warning: {warning}");
}
}