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use anyhow::Result;
use helix_core::Position;
use helix_view::tree::Layout;
use std::path::{Path, PathBuf};
#[derive(Default)]
pub struct Args {
pub display_help: bool,
pub display_version: bool,
pub health: bool,
pub health_arg: Option<String>,
pub load_tutor: bool,
pub fetch_grammars: bool,
pub build_grammars: bool,
pub split: Option<Layout>,
pub verbosity: u64,
pub log_file: Option<PathBuf>,
pub config_file: Option<PathBuf>,
pub files: Vec<(PathBuf, Position)>,
pub working_directory: Option<PathBuf>,
}
impl Args {
pub fn parse_args() -> Result<Args> {
let mut args = Args::default();
let mut argv = std::env::args().peekable();
let mut line_number = 0;
argv.next(); // skip the program, we don't care about that
while let Some(arg) = argv.next() {
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,
"--vsplit" => match args.split {
Some(_) => anyhow::bail!("can only set a split once of a specific type"),
None => args.split = Some(Layout::Vertical),
},
"--hsplit" => match args.split {
Some(_) => anyhow::bail!("can only set a split once of a specific type"),
None => args.split = Some(Layout::Horizontal),
},
"--health" => {
args.health = true;
args.health_arg = argv.next_if(|opt| !opt.starts_with('-'));
}
"-g" | "--grammar" => match argv.next().as_deref() {
Some("fetch") => args.fetch_grammars = true,
Some("build") => args.build_grammars = true,
_ => {
anyhow::bail!("--grammar must be followed by either 'fetch' or 'build'")
}
},
"-c" | "--config" => match argv.next().as_deref() {
Some(path) => args.config_file = Some(path.into()),
None => anyhow::bail!("--config must specify a path to read"),
},
"--log" => match argv.next().as_deref() {
Some(path) => args.log_file = Some(path.into()),
None => anyhow::bail!("--log must specify a path to write"),
},
"-w" | "--working-dir" => match argv.next().as_deref() {
Some(path) => {
args.working_directory = if Path::new(path).is_dir() {
Some(PathBuf::from(path))
} else {
anyhow::bail!(
"--working-dir specified does not exist or is not a directory"
)
}
}
None => {
anyhow::bail!("--working-dir must specify an initial working directory")
}
},
arg if arg.starts_with("--") => {
anyhow::bail!("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,
_ => anyhow::bail!("unexpected short arg {}", chr),
}
}
}
arg if arg.starts_with('+') => {
match arg[1..].parse::<usize>() {
Ok(n) => line_number = n.saturating_sub(1),
_ => args.files.push(parse_file(arg)),
};
}
arg => args.files.push(parse_file(arg)),
}
}
// push the remaining args, if any to the files
for arg in argv {
args.files.push(parse_file(&arg));
}
if let Some(file) = args.files.first_mut() {
if line_number != 0 {
file.1.row = line_number;
}
}
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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