Convert emacs wrapper to tokio's Command.

src/main.rs

@@ -1,8 +1,10 @@
 #![feature(exit_status_error)]
 use axum::{http::StatusCode, routing::post, Json, Router};
+use parse::emacs_parse_org_document;
 use serde::Serialize;
 use tower_http::services::{ServeDir, ServeFile};
 
+mod owner_tree;
 mod parse;
 
 #[tokio::main]
@@ -16,9 +18,10 @@ async fn main() {
     axum::serve(listener, app).await.unwrap();
 }
 
-async fn parse_org_mode(body: String) -> (StatusCode, Json<OwnerTree>) {
+async fn parse_org_mode(body: String) -> Result<(StatusCode, Json<OwnerTree>), (StatusCode, String)> {
+    let ast = emacs_parse_org_document(&body).await.map_err(|e| (StatusCode::BAD_REQUEST, e.to_string()))?;
     let ret = OwnerTree { input_source: body };
-    (StatusCode::OK, Json(ret))
+    Ok((StatusCode::OK, Json(ret)))
 }
 
 #[derive(Serialize)]

src/owner_tree.rs

@@ -0,0 +1 @@
+

src/parse.rs

@@ -1,6 +1,8 @@
-use std::process::Command;
+use tokio::process::Command;
 
-pub fn emacs_parse_org_document<C>(file_contents: C) -> Result<String, Box<dyn std::error::Error>>
+pub async fn emacs_parse_org_document<C>(
+    file_contents: C,
+) -> Result<String, Box<dyn std::error::Error>>
 where
     C: AsRef<str>,
 {
@@ -22,10 +24,10 @@ where
         .arg("--batch")
         .arg("--eval")
         .arg(elisp_script);
-    let out = proc.output()?;
+
+    let out = proc.output().await?;
     out.status.exit_ok()?;
-    let org_sexp = out.stderr;
-    Ok(String::from_utf8(org_sexp)?)
+    Ok(String::from_utf8(out.stderr)?)
 }
 
 fn escape_elisp_string<C>(file_contents: C) -> String