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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 without resolving symlinks.
// Strategy: start from the first component and move up. Cannonicalize previous path,
// join component, cannonicalize new path, strip prefix and join to the final result.
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 => {}
#[cfg(not(windows))]
Component::ParentDir => {
ret.pop();
}
#[cfg(windows)]
Component::ParentDir => {
if let Some(head) = ret.components().next_back() {
match head {
Component::Prefix(_) | Component::RootDir => {}
Component::CurDir => unreachable!(),
// If we left previous component as ".." it means we met a symlink before and we can't pop path.
Component::ParentDir => {
ret.push("..");
}
Component::Normal(_) => {
if ret.is_symlink() {
ret.push("..");
} else {
ret.pop();
}
}
}
}
}
#[cfg(not(windows))]
Component::Normal(c) => {
ret.push(c);
}
#[cfg(windows)]
Component::Normal(c) => 'normal: {
use std::fs::canonicalize;
let new_path = ret.join(c);
if new_path.is_symlink() {
ret = new_path;
break 'normal;
}
let (can_new, can_old) = (canonicalize(&new_path), canonicalize(&ret));
match (can_new, can_old) {
(Ok(can_new), Ok(can_old)) => {
let striped = can_new.strip_prefix(can_old);
ret.push(striped.unwrap_or_else(|_| c.as_ref()));
}
_ => ret.push(c),
}
}
}
}
dunce::simplified(&ret).to_path_buf()
}
/// 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) -> PathBuf {
let path = expand_tilde(path);
let path = if path.is_relative() {
helix_loader::current_working_dir().join(path)
} else {
path
};
get_normalized_path(path.as_path())
}
pub fn get_relative_path(path: &Path) -> PathBuf {
let path = PathBuf::from(path);
let path = if path.is_absolute() {
let cwdir = get_normalized_path(&helix_loader::current_working_dir());
get_normalized_path(&path)
.strip_prefix(cwdir)
.map(PathBuf::from)
.unwrap_or(path)
} else {
path
};
fold_home_dir(&path)
}
/// Returns a truncated filepath where the basepart of the path is reduced to the first
/// char of the folder and the whole filename appended.
///
/// Also strip the current working directory from the beginning of the path.
/// Note that this function does not check if the truncated path is unambiguous.
///
/// ```
/// use helix_core::path::get_truncated_path;
/// use std::path::Path;
///
/// assert_eq!(
/// get_truncated_path("/home/cnorris/documents/jokes.txt").as_path(),
/// Path::new("/h/c/d/jokes.txt")
/// );
/// assert_eq!(
/// get_truncated_path("jokes.txt").as_path(),
/// Path::new("jokes.txt")
/// );
/// assert_eq!(
/// get_truncated_path("/jokes.txt").as_path(),
/// Path::new("/jokes.txt")
/// );
/// assert_eq!(
/// get_truncated_path("/h/c/d/jokes.txt").as_path(),
/// Path::new("/h/c/d/jokes.txt")
/// );
/// assert_eq!(get_truncated_path("").as_path(), Path::new(""));
/// ```
///
pub fn get_truncated_path<P: AsRef<Path>>(path: P) -> PathBuf {
let cwd = helix_loader::current_working_dir();
let path = path
.as_ref()
.strip_prefix(cwd)
.unwrap_or_else(|_| path.as_ref());
let file = path.file_name().unwrap_or_default();
let base = path.parent().unwrap_or_else(|| Path::new(""));
let mut ret = PathBuf::new();
for d in base {
ret.push(
d.to_string_lossy()
.chars()
.next()
.unwrap_or_default()
.to_string(),
);
}
ret.push(file);
ret
}
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