add daemon feature

README.md

@@ -713,7 +713,7 @@ fact(10)
 You can dynamically load a script written in adana in the repl.
 Assuming you've cloned the repo and you use docker, here's an example of how to do it.
 
-Note that the extension can be anything.
+Note that the extension must be `.adana`.
 
 - map the example directory as a docker volume:
 
@@ -884,6 +884,9 @@ RUST_LOG=adana=debug adana
 # using file
 adana -sp /path/to/script.adana
 
+# using file with --daemon feature
+adana -sp /path/to/script.adana -d
+
 # using code
 adana -e 1+1
 ```

adana-shell/src/args.rs

@@ -3,6 +3,7 @@ use anyhow::Context;
 pub enum Argument {
     InMemory,
     Execute(String),
+    Daemon,
     ScriptPath(String),
     DbPath(String),
     NoFallbackInMemory,
@@ -55,6 +56,17 @@ pub fn parse_args(
                 );
                 arguments.push(Argument::InMemory);
             }
+            "--daemon" | "-d" => {
+                anyhow::ensure!(
+                    !arguments.iter().any(|a| matches!(a, Argument::InMemory)),
+                    "daemon should be specified only once!"
+                );
+                anyhow::ensure!(
+                    arguments.iter().any(|a| matches!(a, Argument::ScriptPath(_))),
+                    "script path must be specified first when having the daemon feature on! "
+                );
+                arguments.push(Argument::Daemon);
+            }
             "--no-fallback" | "-nofb" => {
                 anyhow::ensure!(
                     !arguments

adana-shell/src/main.rs

@@ -12,6 +12,7 @@ use nu_ansi_term::Color::LightBlue;
 use nu_ansi_term::Style;
 use rustyline::error::ReadlineError;
 use std::collections::BTreeMap;
+use std::time::Duration;
 use std::{
     borrow::Cow,
     path::{Path, PathBuf},
@@ -95,6 +96,7 @@ fn main() -> anyhow::Result<()> {
             None
         }
     });
+    let is_daemon = args.iter().any(|a| matches!(a, Argument::Daemon));
 
     let mut direct_execution_script = args.iter().find_map(|a| {
         if let Argument::Execute(script) = a {
@@ -104,6 +106,10 @@ fn main() -> anyhow::Result<()> {
         }
     });
 
+    ctrlc::set_handler(|| {
+        debug!("catch CTRL-C! DO NOT REMOVE this. receive ctrl+c signal 2");
+        std::process::exit(0);
+    })?;
     let script = if let Some(script_path) = script_path {
         let pb = PathBuf::from(&script_path);
         if !pb.exists() {
@@ -132,6 +138,7 @@ fn main() -> anyhow::Result<()> {
     } else {
         direct_execution_script.take()
     };
+
     if let Some(script) = script {
         let mut script_context = BTreeMap::new();
 
@@ -147,12 +154,14 @@ fn main() -> anyhow::Result<()> {
             Ok(calc) => println!("{calc}"),
             Err(calc_err) => eprintln!("Error: {calc_err:?}"),
         }
+        if is_daemon {
+            loop {
+                std::thread::sleep(Duration::from_millis(50));
+            }
+        }
         return Ok(());
     }
 
-    ctrlc::set_handler(|| {
-        debug!("catch CTRL-C! DO NOT REMOVE this. receive ctrl+c signal 2")
-    })?;
     clear_terminal();
     println!("{PKG_NAME} v{VERSION} (rust version: {RUST_VERSION})");
     println!("shared lib path: {path_to_shared_lib:?}");