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use anyhow::{Error, Result};
use helix_core::Position;
use std::path::{Path, PathBuf};
#[derive(Default)]
pub struct Args {
pub display_help: bool,
pub display_version: bool,
pub load_tutor: bool,
pub verbosity: u64,
pub files: Vec<(PathBuf, Position)>,
}
impl Args {
pub fn parse_args() -> Result<Args> {
let mut args = Args::default();
let argv: Vec<String> = std::env::args().collect();
let mut iter = argv.iter();
iter.next(); // skip the program, we don't care about that
for arg in &mut iter {
match arg.as_str() {
"--" => break, // stop parsing at this point treat the remaining as files
"--version" => args.display_version = true,
"--help" => args.display_help = true,
"--tutor" => args.load_tutor = true,
arg if arg.starts_with("--") => {
return Err(Error::msg(format!(
"unexpected double dash argument: {}",
arg
)))
}
arg if arg.starts_with('-') => {
let arg = arg.get(1..).unwrap().chars();
for chr in arg {
match chr {
'v' => args.verbosity += 1,
'V' => args.display_version = true,
'h' => args.display_help = true,
_ => return Err(Error::msg(format!("unexpected short arg {}", chr))),
}
}
}
arg => args.files.push(parse_file(arg)),
}
}
// push the remaining args, if any to the files
for arg in iter {
args.files.push(parse_file(arg));
}
Ok(args)
}
}
/// Parse arg into [`PathBuf`] and position.
pub(crate) fn parse_file(s: &str) -> (PathBuf, Position) {
let def = || (PathBuf::from(s), Position::default());
if Path::new(s).exists() {
return def();
}
split_path_row_col(s)
.or_else(|| split_path_row(s))
.unwrap_or_else(def)
}
/// Split file.rs:10:2 into [`PathBuf`], row and col.
///
/// Does not validate if file.rs is a file or directory.
fn split_path_row_col(s: &str) -> Option<(PathBuf, Position)> {
let mut s = s.rsplitn(3, ':');
let col: usize = s.next()?.parse().ok()?;
let row: usize = s.next()?.parse().ok()?;
let path = s.next()?.into();
let pos = Position::new(row.saturating_sub(1), col.saturating_sub(1));
Some((path, pos))
}
/// Split file.rs:10 into [`PathBuf`] and row.
///
/// Does not validate if file.rs is a file or directory.
fn split_path_row(s: &str) -> Option<(PathBuf, Position)> {
let (path, row) = s.rsplit_once(':')?;
let row: usize = row.parse().ok()?;
let path = path.into();
let pos = Position::new(row.saturating_sub(1), 0);
Some((path, pos))
}
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