Add message::link using generic "T: Display + PartialEq", provide impl's

for "&'a str" and String

src/connection/mod.rs

@@ -6,3 +6,6 @@ pub mod verifier;
 pub struct Connection {
     pub inner: rustls::ServerConnection,
 }
+
+impl Connection {
+}

src/message/error.rs

@@ -8,6 +8,7 @@ pub enum Error {
     EmptyHost,
     EmptyMessage,
     ParseHostError(ParseHostError),
+    MalformedLink,
 }
 
 impl fmt::Display for Error {

src/message/link.rs

@@ -0,0 +1,59 @@
+use std::{fmt::Display, str::FromStr};
+
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
+pub struct Link<T: Display + PartialEq> {
+    pub url: T,
+    pub display: Option<T>,
+}
+
+impl<T> Display for Link<T>
+where T: Display + PartialEq {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match &self.display {
+            Some(d) => write!(f, "=> {} {d}", self.url),
+            None => write!(f, "=> {}", self.url),
+        }
+    }
+}
+
+impl FromStr for Link<String> {
+    type Err = super::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let Some(s) = s.strip_prefix("=> ") else {
+            return Err(super::Error::MalformedLink);
+        };
+        if let Some((url, display)) = s.split_once(char::is_whitespace) {
+            Ok(Self { url: url.to_string(), display: Some(display.to_string()) })
+        } else {
+            Ok(Self { url: s.to_string(), display: None })
+        }
+    }
+}
+
+impl TryFrom<&str> for Link<String> {
+    type Error = super::Error;
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        value.parse()
+    }
+}
+
+impl<'a> TryFrom<&'a str> for Link<&'a str> {
+    type Error = super::Error;
+
+    fn try_from(value: &'a str) -> Result<Self, Self::Error> {
+        let Some(s) = value.strip_prefix("=> ") else {
+            return Err(super::Error::MalformedLink);
+        };
+        if let Some((url, display)) = s.split_once(char::is_whitespace) {
+            Ok(Self { url, display: Some(display) })
+        } else {
+            Ok(Self { url: s , display: None })
+        }
+    }
+}

src/message/mod.rs

@@ -1,11 +1,13 @@
 use crate::prelude::{Host, Mailbox};
-use std::{fmt, str::FromStr};
+use std::{fmt, str::FromStr, io::BufRead};
 
 #[cfg(feature = "serde")]
 use serde::{Deserialize, Serialize};
 
 mod error;
-pub use error::Error;
+mod link;
+mod parser;
+pub use {error::Error, link::Link, parser::Parser};
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Recipients {
@@ -20,19 +22,21 @@ impl fmt::Display for Recipients {
 }
 
 #[derive(Clone, Debug, PartialEq)]
-pub enum Lines {
+pub enum Lines<T: fmt::Display + PartialEq> {
     Sender(Mailbox),
     Recipients(Recipients),
-    Timestamp(String),
+    Timestamp(T),
-    Text(String),
+    Text(T),
-    Heading1(String),
+    Heading1(T),
-    Heading2(String),
+    Heading2(T),
-    Heading3(String),
+    Heading3(T),
-    Quote(String),
+    Quote(T),
-    Preformatted(String),
+    Preformatted(T),
+    Link(Link<T>),
 }
 
-impl fmt::Display for Lines {
+impl<T> fmt::Display for Lines<T>
+where T: fmt::Display + PartialEq + BufRead {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Sender(m) => writeln!(f, "< {m}"),
@@ -42,13 +46,9 @@ impl fmt::Display for Lines {
             Self::Heading1(h) => writeln!(f, "# {h}"),
             Self::Heading2(h) => writeln!(f, "## {h}"),
             Self::Heading3(h) => writeln!(f, "### {h}"),
-            Self::Quote(q) => {
+            Self::Quote(q) => writeln!(f, "> {q}"),
-                for l in q.lines() {
-                    writeln!(f, "> {l}")?;
-                }
-                Ok(())
-            }
             Self::Preformatted(p) => writeln!(f, "```\n{p}\n```"),
+            Self::Link(l) => writeln!(f, "=> {l}"),
         }
     }
 }
@@ -57,6 +57,7 @@ impl fmt::Display for Lines {
 #[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 pub struct Message {
     pub id: String,
+    pub from: Mailbox,
     pub senders: Vec<Mailbox>,
     pub recipients: Vec<Mailbox>,
     pub timstamp: Option<String>,

src/message/parser.rs

@@ -0,0 +1,2 @@
+#[derive(Debug)]
+pub struct Parser;