refactor folder with clap derive api

src/folder/command/delete.rs

@@ -0,0 +1,55 @@
+use anyhow::Result;
+use clap::Parser;
+use dialoguer::Confirm;
+use log::info;
+use std::process;
+
+use crate::{
+    account::arg::name::AccountNameFlag, backend::Backend, cache::arg::disable::DisableCacheFlag,
+    config::TomlConfig, folder::arg::name::FolderNameArg, printer::Printer,
+};
+
+/// Delete a folder
+///
+/// All emails from a given folder are definitely deleted. The folder
+/// is also deleted after execution of the command.
+#[derive(Debug, Parser)]
+pub struct FolderDeleteCommand {
+    #[command(flatten)]
+    pub folder: FolderNameArg,
+
+    #[command(flatten)]
+    pub account: AccountNameFlag,
+
+    #[command(flatten)]
+    pub cache: DisableCacheFlag,
+}
+
+impl FolderDeleteCommand {
+    pub async fn execute(self, printer: &mut impl Printer, config: &TomlConfig) -> Result<()> {
+        info!("executing folder delete command");
+
+        let folder = &self.folder.name;
+
+        let confirm_msg = format!("Do you really want to delete the folder {folder}? All emails will be definitely deleted.");
+        let confirm = Confirm::new()
+            .with_prompt(confirm_msg)
+            .default(false)
+            .report(false)
+            .interact_opt()?;
+        if let Some(false) | None = confirm {
+            process::exit(0);
+        };
+
+        let some_account_name = self.account.name.as_ref().map(String::as_str);
+        let (toml_account_config, account_config) = config
+            .clone()
+            .into_account_configs(some_account_name, self.cache.disable)?;
+        let backend = Backend::new(toml_account_config, account_config.clone(), false).await?;
+
+        backend.delete_folder(&folder).await?;
+        printer.print(format!("Folder {folder} successfully deleted!"))?;
+
+        Ok(())
+    }
+}