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//
// Copyright (c) 2020-2021 science+computing ag and other contributors
//
// This program and the accompanying materials are made
// available under the terms of the Eclipse Public License 2.0
// which is available at https://www.eclipse.org/legal/epl-2.0/
//
// SPDX-License-Identifier: EPL-2.0
//
use std::convert::TryFrom;
use std::path::Component;
use anyhow::anyhow;
use anyhow::Result;
/// Helper type for filtering for pathes we need or dont need
///
/// We either have a directory, which has a name, or we have a pkg.toml file, which is of interest.
/// All other files can be ignored and thus are not represented by this type.
///
/// The PathComponent::DirName(_) represents a _part_ of a Path. Something like
///
/// ```ignore
/// let p = PathBuf::from("foo/bar/baz")
/// p.components().map(PathComponent::DirName) // does not actually work because of types
/// ```
///
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum PathComponent {
PkgToml,
DirName(String),
}
impl TryFrom<&std::path::Component<'_>> for PathComponent {
type Error = anyhow::Error;
fn try_from(c: &std::path::Component) -> Result<Self> {
match *c {
Component::Prefix(_) => anyhow::bail!("Unexpected path component: Prefix"),
Component::RootDir => anyhow::bail!("Unexpected path component: RootDir"),
Component::CurDir => anyhow::bail!("Unexpected path component: CurDir"),
Component::ParentDir => anyhow::bail!("Unexpected path component: ParentDir"),
Component::Normal(filename) => {
let filename = filename.to_str().ok_or_else(|| anyhow!("UTF8-error"))?;
if filename == "pkg.toml" {
Ok(PathComponent::PkgToml)
} else {
Ok(PathComponent::DirName(filename.to_string()))
}
},
}
}
}
impl PathComponent {
/// Helper fn whether this PathComponent is a PathComponent::PkgToml
pub fn is_pkg_toml(&self) -> bool {
std::matches!(self, PathComponent::PkgToml)
}
/// Helper fn to get the directory name of this PathComponent if it is a PathComponent::DirName
/// or None if it is not.
pub fn dir_name(&self) -> Option<&str> {
match self {
PathComponent::PkgToml => None,
PathComponent::DirName(dn) => Some(dn)
}
}
}
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