/// Finds a filesystem file.
/// dir_path is an absolute path or a path relative to the current directory.
/// file_name is a path relative to dir_path, the normal components are searched case-insensitive (perfect match takes precedence).
/// file_name cannot exit dir_path
Finds a filesystem file.
dir_path is an absolute path or a path relative to the current directory.
file_name is a path relative to dir_path, the normal components are searched case-insensitive (perfect match takes precedence).
Finds a filesystem file . dir_path is an absolute path or a path relative to the current directory . file_name is a path relative to dir_path the normal components are searched case - insensitive ( perfect match takes precedence ) .
fn find_file(dir_path: &Path, file_name: &Path) -> io::Result<PathBuf> {
    let mut path = dir_path.to_owned();
    let components: Vec<_> = file_name.components().collect();
    let mut depth = 0;
    for (i, component) in components.iter().enumerate() {
        match component {
            Component::Normal(os_str) => {
                depth += 1;
                if let Some(want_caseless) = os_str.to_str().map(|x| Nfc::caseless(x)) {
                    let found: Vec<_> = path
                        .read_dir()?
                        .filter_map(|x| x.ok()) // DirEntry
                        .filter_map(|x| match x.file_type() {
                            Ok(file_type) => Some((x.file_name(), file_type)),
                            _ => None,
                        }) // (OsString,FileType)
                        .collect();
                    if !found.is_empty() {
                        if found.iter().any(|x| &x.0 == os_str) {
                            path.push(os_str); // perfect match
                            continue;
                        }
                        let want_dir = i < components.len() - 1;
                        let mut have: Vec<_> = found
                            .iter()
                            .filter(|x| x.1.is_dir() == want_dir)
                            .filter_map(|x| x.0.to_str()) // &str
                            .filter(|x| Nfc::caseless(x) == want_caseless)
                            .collect();
                        if !have.is_empty() {
                            have.sort();
                            path.push(have[0]); // natural order caseless match
                            continue;
                        }
                    }
                    return Err(io::ErrorKind::NotFound.into());
                }
                path.push(component);
            }
            Component::CurDir => {}
            Component::ParentDir => {
                if depth == 0 {
                    return Err(io::ErrorKind::InvalidInput.into());
                }
                depth -= 1;
                path.pop();
            }
            _ => return Err(io::ErrorKind::InvalidInput.into()),
        }
    }
    if !path.is_file() {
        return Err(io::ErrorKind::NotFound.into());
    }
    Ok(path)
}
fn find_file ( dir_path : & Path , file_name : & Path ) -> io :: Result < PathBuf > { let mut path = dir_path . to_owned ( ) ; let components : Vec < _ > = file_name . components ( ) . collect ( ) ; let mut depth = 0 ; for ( i , component ) in components . iter ( ) . enumerate ( ) { match component { Component :: Normal ( os_str ) => { depth += 1 ; if let Some ( want_caseless ) = os_str . to_str ( ) . map ( | x | Nfc :: caseless ( x ) ) { let found : Vec < _ > = path . read_dir ( ) ? . filter_map ( | x | x . ok ( ) ) // DirEntry . filter_map ( | x | match x . file_type ( ) { Ok ( file_type ) => Some ( ( x . file_name ( ) , file_type ) ) , _ => None , } ) // (OsString,FileType) . collect ( ) ; if ! found . is_empty ( ) { if found . iter ( ) . any ( | x | & x . 0 == os_str ) { path . push ( os_str ) ; // perfect match continue ; } let want_dir = i < components . len ( ) - 1 ; let mut have : Vec < _ > = found . iter ( ) . filter ( | x | x . 1 . is_dir ( ) == want_dir ) . filter_map ( | x | x . 0 . to_str ( ) ) // &str . filter ( | x | Nfc :: caseless ( x ) == want_caseless ) . collect ( ) ; if ! have . is_empty ( ) { have . sort ( ) ; path . push ( have [ 0 ] ) ; // natural order caseless match continue ; } } return Err ( io :: ErrorKind :: NotFound . into ( ) ) ; } path . push ( component ) ; } Component :: CurDir => { } Component :: ParentDir => { if depth == 0 { return Err ( io :: ErrorKind :: InvalidInput . into ( ) ) ; } depth -= 1 ; path . pop ( ) ; } _ => return Err ( io :: ErrorKind :: InvalidInput . into ( ) ) , } } if ! path . is_file ( ) { return Err ( io :: ErrorKind :: NotFound . into ( ) ) ; } Ok ( path ) }
Finds a filesystem file.
Finds a filesystem file .
dir_path
&Path
file_name
&Path