refactor message with clap derive api (part 1)

src/email/message/command/save.rs

@@ -0,0 +1,61 @@
+use anyhow::Result;
+use atty::Stream;
+use clap::Parser;
+use log::info;
+use std::io::{self, BufRead};
+
+use crate::{
+    account::arg::name::AccountNameFlag, backend::Backend, cache::arg::disable::DisableCacheFlag,
+    config::TomlConfig, folder::arg::name::FolderNameArg, printer::Printer,
+};
+
+/// Save a message to a folder
+#[derive(Debug, Parser)]
+pub struct MessageSaveCommand {
+    #[command(flatten)]
+    pub folder: FolderNameArg,
+
+    /// The raw message to save
+    #[arg(value_name = "MESSAGE", raw = true)]
+    pub raw: String,
+
+    #[command(flatten)]
+    pub cache: DisableCacheFlag,
+
+    #[command(flatten)]
+    pub account: AccountNameFlag,
+}
+
+impl MessageSaveCommand {
+    pub async fn execute(self, printer: &mut impl Printer, config: &TomlConfig) -> Result<()> {
+        info!("executing message save command");
+
+        let folder = &self.folder.name;
+        let account = self.account.name.as_ref().map(String::as_str);
+        let cache = self.cache.disable;
+        let raw_msg = &self.raw;
+
+        let (toml_account_config, account_config) =
+            config.clone().into_account_configs(account, cache)?;
+        let backend = Backend::new(toml_account_config, account_config.clone(), true).await?;
+
+        let is_tty = atty::is(Stream::Stdin);
+        let is_json = printer.is_json();
+        let raw_email = if is_tty || is_json {
+            raw_msg.replace("\r", "").replace("\n", "\r\n")
+        } else {
+            io::stdin()
+                .lock()
+                .lines()
+                .filter_map(Result::ok)
+                .collect::<Vec<String>>()
+                .join("\r\n")
+        };
+
+        backend
+            .add_raw_message(folder, raw_email.as_bytes())
+            .await?;
+
+        printer.print("Message successfully saved to {folder}!")
+    }
+}