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