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use std::error::Error;
use std::fs::File;
use std::io::BufWriter;
use std::process::ExitCode;
mod definitions;
fn do_write<W, E: Error>(path: &str, write_func: W) -> Result<(), Box<dyn Error>>
where
W: FnOnce(BufWriter<File>) -> Result<(), E>,
{
println!("Writing output to {path}...");
let tmp_name = format!(".{path}.tmp");
let file = File::create(&tmp_name).map_err(|e| format!("Error creating {tmp_name}: {e}"))?;
let writer = BufWriter::new(file);
write_func(writer).map_err(|e| format!("Error writing to {tmp_name}: {e}"))?;
_ = std::fs::remove_file(path); // OK if this already exists
std::fs::rename(&tmp_name, path)
.map_err(|e| format!("Error renaming {tmp_name} => {path}: {e}"))?;
Ok(())
}
fn try_main() -> Result<(), Box<dyn Error>> {
let mut args = std::env::args_os().skip(1);
let command = args.next();
let no_command = "No command specified. Commands available:
- definitions";
let Some(command) = command else {
return Err(no_command.into());
};
if command == "-h" || command == "--help" {
return Err(no_command.into());
}
let mut command_args = vec![];
for arg in args {
let Some(arg) = arg.to_str() else {
return Err(format!(
"Bad UTF-8 in argument: {}",
arg.to_string_lossy().escape_debug()
)
.into());
};
command_args.push(arg.to_owned());
}
match &command.to_string_lossy()[..] {
"definitions" => definitions::definitions(command_args),
x => Err(format!("Unrecognized command: {x}").into()),
}
}
fn main() -> ExitCode {
use std::time::Instant;
let start_time = Instant::now();
if let Err(e) = try_main() {
eprintln!("Error: {e}");
return ExitCode::FAILURE;
}
println!(
"Time taken: {:?}",
Instant::now().duration_since(start_time)
);
ExitCode::SUCCESS
}
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