Cleanup install command

xtask/src/flags.rs

@@ -1,5 +1,7 @@
 #![allow(unreachable_pub)]
 
+use crate::install::{ClientOpt, Malloc, ServerOpt};
+
 xflags::args_parser! {
     /// Run custom build command.
     cmd xtask {
@@ -137,3 +139,34 @@ impl Xtask {
     }
 }
 // generated end
+
+impl Install {
+    pub(crate) fn validate(&self) -> xflags::Result<()> {
+        if let Some(code_bin) = &self.code_bin {
+            if let Err(err) = code_bin.parse::<ClientOpt>() {
+                return Err(xflags::Error::new(format!("failed to parse `--code-bin`: {}", err)));
+            }
+        }
+        Ok(())
+    }
+    pub(crate) fn server(&self) -> Option<ServerOpt> {
+        if self.client && !self.server {
+            return None;
+        }
+        let malloc = if self.mimalloc {
+            Malloc::Mimalloc
+        } else if self.jemalloc {
+            Malloc::Jemalloc
+        } else {
+            Malloc::System
+        };
+        Some(ServerOpt { malloc })
+    }
+    pub(crate) fn client(&self) -> Option<ClientOpt> {
+        if !self.client && self.server {
+            return None;
+        }
+        let client_opt = self.code_bin.as_ref().and_then(|it| it.parse().ok()).unwrap_or_default();
+        Some(client_opt)
+    }
+}