70 lines
1.6 KiB
Rust
70 lines
1.6 KiB
Rust
use std::borrow::Cow;
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use std::fmt::{self, Display, Formatter};
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use serde::{Deserialize, Serialize};
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use crate::util::{DAY, HOUR, WEEK};
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#[derive(Clone, Debug, Deserialize, Serialize)]
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pub struct Dir<'a> {
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#[serde(borrow)]
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pub path: Cow<'a, str>,
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pub rank: Rank,
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pub last_accessed: Epoch,
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}
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impl Dir<'_> {
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pub fn display(&self) -> DirDisplay<'_> {
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DirDisplay::new(self)
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}
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pub fn score(&self, now: Epoch) -> Rank {
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// The older the entry, the lesser its importance.
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let duration = now.saturating_sub(self.last_accessed);
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if duration < HOUR {
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self.rank * 4.0
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} else if duration < DAY {
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self.rank * 2.0
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} else if duration < WEEK {
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self.rank * 0.5
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} else {
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self.rank * 0.25
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}
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}
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}
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pub struct DirDisplay<'a> {
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dir: &'a Dir<'a>,
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now: Option<Epoch>,
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separator: char,
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}
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impl<'a> DirDisplay<'a> {
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fn new(dir: &'a Dir) -> Self {
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Self { dir, separator: ' ', now: None }
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}
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pub fn with_score(mut self, now: Epoch) -> Self {
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self.now = Some(now);
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self
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}
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pub fn with_separator(mut self, separator: char) -> Self {
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self.separator = separator;
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self
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}
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}
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impl Display for DirDisplay<'_> {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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if let Some(now) = self.now {
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let score = self.dir.score(now).clamp(0.0, 9999.0);
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write!(f, "{score:>6.1}{}", self.separator)?;
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}
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write!(f, "{}", self.dir.path)
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}
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}
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pub type Rank = f64;
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pub type Epoch = u64;
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