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) = super::home_dir() { if path.starts_with(&home) { // it's ok to unwrap, the path starts with home dir return PathBuf::from("~").join(path.strip_prefix(&home).unwrap()); } } path.to_path_buf() } /// Expands tilde `~` into users home directory if avilable, 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) = super::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: pub fn get_normalized_path(path: &Path) -> PathBuf { let path = expand_tilde(path); 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 { let path = if path.is_relative() { std::env::current_dir().map(|current_dir| current_dir.join(path))? } else { path.to_path_buf() }; 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) }