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use std::fmt;
use std::fs;
use std::io;
use std::path;
use Predicate;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
enum FileType {
File,
Dir,
Symlink,
}
impl FileType {
fn from_path(path: &path::Path) -> io::Result<FileType> {
let file_type = path.metadata()?.file_type();
if file_type.is_dir() {
return Ok(FileType::Dir);
}
if path.is_file() {
return Ok(FileType::File);
}
Ok(FileType::Symlink)
}
fn eval(self, ft: fs::FileType) -> bool {
match self {
FileType::File => ft.is_file(),
FileType::Dir => ft.is_dir(),
FileType::Symlink => ft.is_symlink(),
}
}
}
impl fmt::Display for FileType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let t = match *self {
FileType::File => "file",
FileType::Dir => "dir",
FileType::Symlink => "symlink",
};
write!(f, "{}", t)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct FileTypePredicate {
ft: FileType,
follow: bool,
}
impl FileTypePredicate {
pub fn follow_links(mut self, yes: bool) -> Self {
self.follow = yes;
self
}
pub fn from_path(path: &path::Path) -> io::Result<FileTypePredicate> {
Ok(FileTypePredicate {
ft: FileType::from_path(path)?,
follow: true,
})
}
}
impl Predicate<path::Path> for FileTypePredicate {
fn eval(&self, path: &path::Path) -> bool {
let metadata = if self.follow {
path.metadata()
} else {
path.symlink_metadata()
};
metadata
.map(|m| self.ft.eval(m.file_type()))
.unwrap_or(false)
}
}
impl fmt::Display for FileTypePredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var is {}", self.ft)
}
}
pub fn is_file() -> FileTypePredicate {
FileTypePredicate {
ft: FileType::File,
follow: false,
}
}
pub fn is_dir() -> FileTypePredicate {
FileTypePredicate {
ft: FileType::Dir,
follow: false,
}
}
pub fn is_symlink() -> FileTypePredicate {
FileTypePredicate {
ft: FileType::Symlink,
follow: false,
}
}