arcature-cli 2026.1.1

use std::fmt;
use std::path::PathBuf;

#[derive(Debug)]
pub(crate) enum ProjectError {
    CurrentDirectory(std::io::Error),
    InvalidConfig {
        path: PathBuf,
        source: toml::de::Error,
    },
    InvalidName(String),
    InvalidField {
        field: &'static str,
        value: String,
    },
    NotFound(PathBuf),
    ReadConfig {
        path: PathBuf,
        source: std::io::Error,
    },
}

impl fmt::Display for ProjectError {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::CurrentDirectory(error) => {
                write!(formatter, "cannot inspect the current directory: {error}")
            }
            Self::InvalidConfig { path, source } => write!(
                formatter,
                "invalid Arcature project config {}: {source}",
                path.display()
            ),
            Self::InvalidName(name) => write!(
                formatter,
                "invalid project name `{name}`; use lowercase ASCII letters, digits, and single hyphens"
            ),
            Self::InvalidField { field, value } => {
                write!(
                    formatter,
                    "invalid `{field}` value `{value}` in arcature.toml"
                )
            }
            Self::NotFound(start) => write!(
                formatter,
                "no Arcature project found from {}; expected arcature.toml in this directory or an ancestor",
                start.display()
            ),
            Self::ReadConfig { path, source } => write!(
                formatter,
                "cannot read Arcature project config {}: {source}",
                path.display()
            ),
        }
    }
}

impl std::error::Error for ProjectError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Self::CurrentDirectory(error) => Some(error),
            Self::InvalidConfig { source, .. } => Some(source),
            Self::ReadConfig { source, .. } => Some(source),
            Self::InvalidName(_) | Self::InvalidField { .. } | Self::NotFound(_) => None,
        }
    }
}