closerrrrrr to actual code woo

src/main.rs

@@ -1,6 +1,8 @@
 use serde::{Serialize, Deserialize};
 use std::io::{Read, Write};
 use std::fs::File;
+use std::time::{SystemTime, UNIX_EPOCH, Duration};
+use std::ops::Add;
 
 fn main() {
     println!("Hello, world!");
@@ -8,13 +10,13 @@ fn main() {
 
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 struct Storage {
-   adds: Vec<Add>,
+   xs: Vec<X>,
 }
 
-#[derive(Debug, PartialEq, Serialize, Deserialize)]
-struct Add {
+#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
+struct X {
    t: i64,
-   add: String,
+   x: String,
    tag: String,
 }
 
@@ -48,24 +50,24 @@ fn _load_storage(reader: &mut dyn Read) -> Result<Storage, String> {
 }
 
 #[cfg(test)]
-mod tests {
+mod test_save_load {
    use super::*;
 
    #[test]
    fn test_save_load_empty() {
-      let got = _load_storage(&mut "adds: []".as_bytes()).expect("failed to parse 'adds: []' storage");
-      assert_eq!(got, Storage{adds: vec![]});
+      let got = _load_storage(&mut "xs: []".as_bytes()).expect("failed to parse 'xs: []' storage");
+      assert_eq!(got, Storage{xs: vec![]});
 
       let mut w = vec![];
       _save_storage(&mut w, got).expect("failed saving storage to writer");
-      assert_eq!(String::from_utf8(w).unwrap(), "adds: []\n".to_string());
+      assert_eq!(String::from_utf8(w).unwrap(), "xs: []\n".to_string());
    }
 
    #[test]
    fn test_testdata_standalone_yaml() {
-      let want = Storage{adds: vec![
-         Add{t: 1, add: "def".to_string(), tag: "abc".to_string()},
-         Add{t: 2, add: "ghi".to_string(), tag: "".to_string()},
+      let want = Storage{xs: vec![
+         X{t: 1, x: "def".to_string(), tag: "abc".to_string()},
+         X{t: 2, x: "ghi".to_string(), tag: "".to_string()},
       ]};
       assert_eq!(
          load_storage("./src/testdata/standalone.yaml".to_string()).expect("cant load standalone.yaml"),
@@ -74,6 +76,44 @@ mod tests {
 
       let mut w = vec![];
       _save_storage(&mut w, want).expect("failed saving storage to writer");
-      assert_eq!(String::from_utf8(w).unwrap(), "adds:\n- t: 1\n  add: def\n  tag: abc\n- t: 2\n  add: ghi\n  tag: ''\n".to_string());
+      assert_eq!(String::from_utf8(w).unwrap(), "xs:\n- t: 1\n  x: def\n  tag: abc\n- t: 2\n  x: ghi\n  tag: ''\n".to_string());
+   }
+}
+
+impl Storage {
+   fn from(&self, t: SystemTime) -> Storage {
+      let mut result = Storage{xs: vec![]};
+      self.xs.iter()
+         .filter(|x| !x.clone().clone().before(t))
+         .for_each(|x| result.xs.push(x.clone()));
+      result
+   }
+}
+
+impl X {
+   fn before(self, t: SystemTime) -> bool {
+      self.ts() < t
+   }
+
+   fn ts(self) -> SystemTime {
+      UNIX_EPOCH.add(Duration::from_secs(self.t.try_into().unwrap()))
+   }
+}
+
+#[cfg(test)]
+mod test_storage {
+   use super::*;
+
+   #[test]
+   fn test_storage_from_date() {
+      let given = Storage{xs: vec![
+         X{t: 1, x: "def".to_string(), tag: "abc".to_string()},
+         X{t: 2, x: "ghi".to_string(), tag: "".to_string()},
+      ]};
+      let want = Storage{xs: vec![
+         X{t: 2, x: "ghi".to_string(), tag: "".to_string()},
+      ]};
+      let got = given.from(UNIX_EPOCH.add(Duration::from_secs(1)));
+      assert_eq!(got, want);
    }
 }

src/testdata/standalone.txt

@@ -1,9 +1,9 @@
 - t: 1969-12-31
   d:
-  adds:
+  xs:
   - d: 1
-    add: abc
-    adds:
+    x: abc
+    xs:
     - def
   - d: 0
-    add: ghi
+    x: ghi

src/testdata/standalone.yaml

@@ -1,7 +1,7 @@
-adds:
+xs:
 - t: 1
-  add: def
+  x: def
   tag: abc
 - t: 2
-  add: ghi
+  x: ghi
   tag: ""