morpho 0.18.3

use std::error::Error as StdError;
use std::path::PathBuf;

use derive_more::{Display, From};

/// Result type
pub type Result<T> = std::result::Result<T, Error>;

/// The Error type
#[derive(Debug, Display, From)]
pub enum Error {
	#[display(fmt = "IO error")]
	Io(std::io::Error),
	#[display(fmt = "Path strip prefix error")]
	PathStripPrefix(std::path::StripPrefixError),
	#[display(fmt = "Template error")]
	Template(tera::Error),
	#[display(fmt = "Notify error")]
	Notify(notify::Error),
	#[display(fmt = "Glob pattern error")]
	GlobPattern(glob::PatternError),
	#[display(fmt = "Toml export error")]
	TomlExport(toml::ser::Error),
	#[display(fmt = "Path expand error")]
	PathExpend(shellexpand::LookupError<std::env::VarError>),
	#[display(fmt = "Post head parse error, please use toml grammar")]
	PostHeadPaser(toml::de::Error),

	#[from(ignore)]
	#[display(fmt = "blog root directory {:?} already exists", _0)]
	RootDirExisted(PathBuf),
	#[from(ignore)]
	#[display(
		fmt = "post path {:?} format error: must be relative path without file extension",
		_0
	)]
	PostPathInvaild(PathBuf),
	#[from(ignore)]
	#[display(fmt = "post path {:?} already existed", _0)]
	PostPathExisted(PathBuf),
	#[from(ignore)]
	#[display(fmt = "Theme template file {:?} encoding error", _0)]
	ThemeFileEncoding(String),
	#[from(ignore)]
	#[display(fmt = "blog theme {:?} in use, can not be deleted", _0)]
	ThemeInUse(String),
	#[from(ignore)]
	#[display(fmt = "blog theme {:?} not found", _0)]
	ThemeNotFound(String),
	#[from(ignore)]
	#[display(
		fmt = "post {:?} must has two parts: headers and body, splitted by first blank line",
		_0
	)]
	PostOnlyOnePart(PathBuf),
	#[from(ignore)]
	#[display(fmt = "post {:?} head part is empty", _0)]
	PostNoHead(PathBuf),
	#[from(ignore)]
	#[display(fmt = "post {:?} body part is empty", _0)]
	PostNoBody(PathBuf),
}

impl StdError for Error {
	fn source(&self) -> Option<&(dyn StdError + 'static)> {
		use Error::*;
		match self {
			Io(e) => Some(e),
			PathStripPrefix(e) => Some(e),
			Template(e) => Some(e),
			Notify(e) => Some(e),
			GlobPattern(e) => Some(e),
			TomlExport(e) => Some(e),
			PathExpend(e) => Some(e),
			PostHeadPaser(e) => Some(e),
			RootDirExisted(_) => None,
			PostPathInvaild(_) => None,
			PostPathExisted(_) => None,
			ThemeFileEncoding(_) => None,
			ThemeInUse(_) => None,
			ThemeNotFound(_) => None,
			PostOnlyOnePart(_) => None,
			PostNoHead(_) => None,
			PostNoBody(_) => None,
		}
	}
}