refactor: split parser internals into focused modules

src/utils/parser/protocol.rs

@@ -0,0 +1,28 @@
+use std::str::FromStr;
+
+use super::REMOTE_OPT_PROTOCOL_REGEX;
+use crate::filetransfer::FileTransferProtocol;
+
+pub(super) fn parse_remote_opt_protocol(
+    s: &str,
+    default: FileTransferProtocol,
+) -> Result<(FileTransferProtocol, String), String> {
+    let groups = REMOTE_OPT_PROTOCOL_REGEX
+        .captures(s)
+        .ok_or_else(|| "Invalid args".to_string())?;
+
+    let protocol = match groups.get(1) {
+        Some(protocol) => FileTransferProtocol::from_str(protocol.as_str())
+            .map_err(|_| format!("Unknown protocol \"{}\"", protocol.as_str()))?,
+        #[cfg(smb_windows)]
+        None if groups.get(2).is_some() => FileTransferProtocol::Smb,
+        None => default,
+    };
+
+    let remote = groups
+        .get(3)
+        .map(|group| group.as_str().to_string())
+        .unwrap_or_default();
+
+    Ok((protocol, remote))
+}