dwipe 0.1.4

Fast, cross-platform disk cleanup tool with interactive UI
Documentation 
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use std::cmp::Ordering;

#[derive(Debug, Clone, PartialEq, Eq)]
pub enum FolderEntryType {
    Parent,
    File,
    Folder,
}

impl Ord for FolderEntryType {
    fn cmp(&self, other: &Self) -> Ordering {
        match (self, other) {
            (FolderEntryType::Parent, _) => Ordering::Less,
            (FolderEntryType::Folder, FolderEntryType::Parent) => Ordering::Greater,
            (FolderEntryType::Folder, FolderEntryType::Folder) => Ordering::Equal,
            (FolderEntryType::Folder, _) => Ordering::Less,
            (FolderEntryType::File, FolderEntryType::Parent) => Ordering::Greater,
            (FolderEntryType::File, FolderEntryType::Folder) => Ordering::Greater,
            (FolderEntryType::File, FolderEntryType::File) => Ordering::Equal,
        }
    }
}

impl PartialOrd for FolderEntryType {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct FolderEntry {
    pub title: String,
    pub size: Option<u64>,
    pub kind: FolderEntryType,
    pub is_loaded: bool,
}

impl Ord for FolderEntry {
    fn cmp(&self, other: &Self) -> Ordering {
        let kind_ordering = self.kind.cmp(&other.kind);

        if kind_ordering != Ordering::Equal {
            return kind_ordering;
        }

        self.title.cmp(&other.title)
    }
}

impl PartialOrd for FolderEntry {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl FolderEntry {
    pub fn increment_size(&mut self, addition: u64) {
        match self.size {
            Some(ref mut s) => {
                *s += addition;
            }
            None => self.size = Some(addition),
        }
    }

    pub fn sort_by_size(entries: &mut [FolderEntry]) {
        entries.sort_by(|a, b| {
            if let (Some(size_a), Some(size_b)) = (a.size, b.size) {
                size_a.cmp(&size_b)
            } else if a.size.is_some() {
                Ordering::Less
            } else if b.size.is_some() {
                Ordering::Greater
            } else {
                Ordering::Equal
            }
        });
    }
}