hybrid_phi/
phi_meta.rs

1//! phi_meta: metadata handler for φ-memory entries
2//! Supports structured save/load of metadata alongside binary φ-data
3
4use std::fs::File;
5use std::io::{BufWriter, BufReader, Write, BufRead};
6use std::path::Path;
7use chrono::{DateTime, Utc};
8use serde::{Deserialize, Serialize};
9
10#[derive(Debug, Clone, Serialize, Deserialize)]
11pub struct PhiMetadata {
12    pub n: usize,
13    pub step: f64,
14    pub length: usize,
15    pub saved_at: DateTime<Utc>,
16}
17
18impl PhiMetadata {
19    /// Save metadata to .meta.txt file
20    pub fn save<P: AsRef<Path>>(&self, name: &str, base_path: P) -> std::io::Result<()> {
21        let path = base_path.as_ref().join(format!("{}.meta.txt", name));
22        let mut writer = BufWriter::new(File::create(path)?);
23        writeln!(writer, "n={}", self.n)?;
24        writeln!(writer, "step={:.6}", self.step)?;
25        writeln!(writer, "length={}", self.length)?;
26        writeln!(writer, "saved_at={}", self.saved_at.to_rfc3339())?;
27        Ok(())
28    }
29
30    /// Load metadata from .meta.txt file
31    pub fn load<P: AsRef<Path>>(name: &str, base_path: P) -> std::io::Result<Self> {
32        let path = base_path.as_ref().join(format!("{}.meta.txt", name));
33        let file = BufReader::new(File::open(path)?);
34
35        let mut n = 0;
36        let mut step = 0.0;
37        let mut length = 0;
38        let mut saved_at = Utc::now();
39
40        for line in file.lines() {
41            let line = line?;
42            if let Some(v) = line.strip_prefix("n=") {
43                n = v.parse().unwrap_or(0);
44            } else if let Some(v) = line.strip_prefix("step=") {
45                step = v.parse().unwrap_or(0.0);
46            } else if let Some(v) = line.strip_prefix("length=") {
47                length = v.parse().unwrap_or(0);
48            } else if let Some(v) = line.strip_prefix("saved_at=") {
49                saved_at = DateTime::parse_from_rfc3339(v)
50                    .map(|dt| dt.with_timezone(&Utc))
51                    .unwrap_or(Utc::now());
52            }
53        }
54
55        Ok(Self { n, step, length, saved_at })
56    }
57}
hybrid_phi/phi_meta.rs

hybrid_phi/
phi_meta.rs
