refactors and add timestamp to meme display

src/api.rs

@@ -1,5 +1,5 @@
 use anyhow::{anyhow, Result};
-use serde::Deserialize;
+use serde::{Deserialize, Deserializer, de::{self, Visitor}};
 
 #[derive(Deserialize, Debug, PartialEq, Eq, Clone)]
 pub struct UpResp {
@@ -34,6 +34,8 @@ pub struct Meme {
     pub path: String,
     pub category: String,
     pub user: String,
+    #[serde(deserialize_with = "deserialize_timestamp")]
+    pub timestamp: i64,
 }
 
 impl Meme {
@@ -62,3 +64,37 @@ impl User {
             .or(self.userdir.as_ref())
     }
 }
+
+fn deserialize_timestamp<'de, D>(deserializer: D) -> Result<i64, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    struct Vis;
+
+    impl<'de> Visitor<'de> for Vis {
+        type Value = i64;
+
+        fn expecting(&self, fmt: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+            fmt.write_str(
+                "A timestamp in the form of a string or i64 (because tilera doesn't know integers \
+                 exist)",
+            )
+        }
+
+        fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
+        where
+            E: de::Error,
+        {
+            Ok(v)
+        }
+
+        fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>
+        where
+            E: de::Error,
+        {
+            v.parse().map_err(|_| de::Error::invalid_value(de::Unexpected::Str(v), &self))
+        }
+    }
+
+    deserializer.deserialize_any(Vis)
+}

src/util.rs

@@ -152,6 +152,7 @@ pub enum MemeSorting {
     Link,
     Category,
     User,
+    Timestamp,
 }
 
 impl MemeSorting {
@@ -171,6 +172,7 @@ impl MemeSorting {
             Self::Link => sort!(memes, link),
             Self::Category => sort!(memes, category),
             Self::User => sort!(memes, user),
+            Self::Timestamp => memes.sort_by(|a, b| b.timestamp.cmp(&a.timestamp)),
         }
     }
 }
@@ -184,6 +186,7 @@ impl FromStr for MemeSorting {
             "link" => Ok(Self::Link),
             "category" => Ok(Self::Category),
             "user" => Ok(Self::User),
+            "timestamp" => Ok(Self::Timestamp),
             _ => bail!("Invalid Meme sorting! options are id, link, category and user!"),
         }
     }