add umbrella crate

email/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "viendesu-email"
+version = "0.1.0"
+edition = "2024"
+
+[features]
+default = ["smtp"]
+smtp = []
+
+[dependencies]
+viendesu-core.workspace = true
+eva.workspace = true

email/src/error.rs

@@ -0,0 +1,11 @@
+use viendesu_core::{errors::Aux, mk_error};
+
+pub type MailResult<O> = Result<O, MailError>;
+
+mk_error!(MailError);
+
+impl From<MailError> for Aux {
+    fn from(value: MailError) -> Self {
+        Self::Mail(eva::str::format_compact!("{}", value.0))
+    }
+}

email/src/lib.rs

@@ -0,0 +1,20 @@
+use eva::{data, fut::Fut};
+
+use std::borrow::Cow;
+
+pub mod mock;
+pub mod smtp;
+
+pub mod error;
+
+#[data]
+pub struct Letter<'a> {
+    pub subject: Cow<'a, str>,
+    pub contents: Cow<'a, str>,
+    pub content_type: Cow<'a, str>,
+}
+
+#[eva::auto_impl(&, &mut, Arc, Box)]
+pub trait Mailer: Send + Sync {
+    fn send(&self, dst: &str, letter: Letter<'_>) -> impl Fut<Output = error::MailResult<()>>;
+}

email/src/mock.rs

@@ -0,0 +1,43 @@
+use std::{
+    borrow::Cow,
+    sync::{Arc, Mutex},
+};
+
+use eva::{
+    collections::HashMap,
+    str::{CompactString, ToCompactString},
+};
+
+use crate::{Letter, Mailer, error::MailResult};
+
+pub type Mailbox = Vec<Letter<'static>>;
+pub type Letters = HashMap<CompactString, Mailbox>;
+
+#[derive(Debug, Clone, Default)]
+pub struct Mock(Arc<Mutex<Letters>>);
+
+impl Mock {
+    pub fn collect_letters(&self) -> Letters {
+        std::mem::take(&mut *self.0.lock().unwrap())
+    }
+}
+
+fn owned(c: Cow<'_, str>) -> Cow<'static, str> {
+    Cow::Owned((*c).to_owned())
+}
+
+impl Mailer for Mock {
+    async fn send(&self, dst: &str, letter: Letter<'_>) -> MailResult<()> {
+        let dst = dst.to_compact_string();
+        let mut this = self.0.lock().unwrap();
+        let mailbox = this.entry(dst).or_default();
+
+        mailbox.push(Letter {
+            subject: owned(letter.subject),
+            contents: owned(letter.contents),
+            content_type: owned(letter.content_type),
+        });
+
+        Ok(())
+    }
+}

email/src/smtp.rs

@@ -0,0 +1 @@
+pub struct Smtp;