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use etcetera::home_dir;
use std::path::{Component, Path, PathBuf};
/// Replaces users home directory from `path` with tilde `~` if the directory
/// is available, otherwise returns the path unchanged.
pub fn fold_home_dir(path: &Path) -> PathBuf {
if let Ok(home) = home_dir() {
if let Ok(stripped) = path.strip_prefix(&home) {
return PathBuf::from("~").join(stripped);
}
}
path.to_path_buf()
}
/// Expands tilde `~` into users home directory if available, otherwise returns the path
/// unchanged. The tilde will only be expanded when present as the first component of the path
/// and only slash follows it.
pub fn expand_tilde(path: &Path) -> PathBuf {
let mut components = path.components().peekable();
if let Some(Component::Normal(c)) = components.peek() {
if c == &"~" {
if let Ok(home) = home_dir() {
// it's ok to unwrap, the path starts with `~`
return home.join(path.strip_prefix("~").unwrap());
}
}
}
path.to_path_buf()
}
/// Normalize a path, removing things like `.` and `..`.
///
/// CAUTION: This does not resolve symlinks (unlike
/// [`std::fs::canonicalize`]). This may cause incorrect or surprising
/// behavior at times. This should be used carefully. Unfortunately,
/// [`std::fs::canonicalize`] can be hard to use correctly, since it can often
/// fail, or on Windows returns annoying device paths. This is a problem Cargo
/// needs to improve on.
/// Copied from cargo: <https://github.com/rust-lang/cargo/blob/070e459c2d8b79c5b2ac5218064e7603329c92ae/crates/cargo-util/src/paths.rs#L81>
pub fn get_normalized_path(path: &Path) -> PathBuf {
let mut components = path.components().peekable();
let mut ret = if let Some(c @ Component::Prefix(..)) = components.peek().cloned() {
components.next();
PathBuf::from(c.as_os_str())
} else {
PathBuf::new()
};
for component in components {
match component {
Component::Prefix(..) => unreachable!(),
Component::RootDir => {
ret.push(component.as_os_str());
}
Component::CurDir => {}
Component::ParentDir => {
ret.pop();
}
Component::Normal(c) => {
ret.push(c);
}
}
}
ret
}
/// Returns the canonical, absolute form of a path with all intermediate components normalized.
///
/// This function is used instead of `std::fs::canonicalize` because we don't want to verify
/// here if the path exists, just normalize it's components.
pub fn get_canonicalized_path(path: &Path) -> std::io::Result<PathBuf> {
let path = expand_tilde(path);
let path = if path.is_relative() {
std::env::current_dir().map(|current_dir| current_dir.join(path))?
} else {
path
};
Ok(get_normalized_path(path.as_path()))
}
pub fn get_relative_path(path: &Path) -> PathBuf {
let path = if path.is_absolute() {
let cwdir = std::env::current_dir().expect("couldn't determine current directory");
path.strip_prefix(cwdir).unwrap_or(path)
} else {
path
};
fold_home_dir(path)
}
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