Allow defining commands in Lua, and executing them.

src/command_handler.rs

@@ -4,6 +4,15 @@ use crate::{
     echo_to_term_frame, lua_state::LuaState, parsing::parse_commands, GlobalCell, TermFrame,
 };
 
+fn debrace(inp: &str) -> &str {
+    let v = inp.trim();
+    if v.starts_with("{") && v.ends_with("}") {
+        &v[1..(v.len() - 1)]
+    } else {
+        v
+    }
+}
+
 fn reentrant_command_handler(
     lua_state: &mut LuaState,
     globals: &GlobalCell,
@@ -16,12 +25,23 @@ fn reentrant_command_handler(
         match command.split_out_command() {
             None => (),
             Some((cmd, rest)) => {
-                if cmd == "##" {
-                    match lua_state.execute(&join(rest.arguments.iter(), " ")) {
-                        Ok(()) => (),
-                        Err(msg) => {
-                            echo_to_term_frame(globals, term_frame, &format!("{}\r\n", msg))
-                                .unwrap_or(())
+                if cmd.starts_with('#') {
+                    if cmd == "##" {
+                        match lua_state.execute(debrace(&join(rest.arguments.iter(), " "))) {
+                            Ok(()) => (),
+                            Err(msg) => {
+                                echo_to_term_frame(globals, term_frame, &format!("{}\r\n", msg))
+                                    .unwrap_or(())
+                            }
+                        }
+                    } else {
+                        let cmd = &cmd[1..];
+                        match lua_state.execute_command(cmd, &rest.arguments) {
+                            Ok(()) => (),
+                            Err(msg) => {
+                                echo_to_term_frame(globals, term_frame, &format!("{}\r\n", msg))
+                                    .unwrap_or(())
+                            }
                         }
                     }
                 }

src/lua_state.rs

@@ -1,11 +1,11 @@
 use anyhow::Error;
 use piccolo::{
     Callback, Closure, Context, Executor, FromValue, Function, IntoValue, Lua, StashedExecutor,
-    StaticError, Table,
+    StaticError, Table, Value, Variadic,
 };
 
 use crate::{echo_to_term_frame, GlobalCell, TermFrame};
-use std::str;
+use std::{collections::VecDeque, str};
 
 pub struct LuaState {
     pub interp: Lua,
@@ -48,6 +48,35 @@ impl LuaState {
             .execute::<()>(&self.exec)
             .map_err(|err| format!("{}", err))
     }
+
+    pub fn execute_command(
+        &mut self,
+        command: &str,
+        arguments: &VecDeque<&str>,
+    ) -> Result<(), String> {
+        self.interp
+            .try_enter(|ctx| {
+                let commands =
+                    Table::from_value(ctx, ctx.get_global(ctx.intern_static(b"commands")))?;
+                let command_fn =
+                    Function::from_value(ctx, commands.get(ctx, ctx.intern(command.as_bytes())))?;
+                ctx.fetch(&self.exec).restart(
+                    ctx,
+                    command_fn,
+                    Variadic(
+                        arguments
+                            .iter()
+                            .map(|s| ctx.intern(s.as_bytes()).into())
+                            .collect::<Vec<Value>>(),
+                    ),
+                );
+                Ok(())
+            })
+            .map_err(|err| format!("{}", err))?;
+        self.interp
+            .execute::<()>(&self.exec)
+            .map_err(|err| format!("{}", err))
+    }
 }
 
 pub fn install_lua_globals(global: &GlobalCell) -> Result<(), String> {
@@ -105,8 +134,14 @@ fn echo_frame<'gc>(ctx: Context<'gc>, _global: GlobalCell) -> Callback<'gc> {
         let commands: Table<'gc> =
             Table::from_value(ctx, ctx.get_global(ctx.intern_static(b"commands")))?;
         let function = Function::from_value(ctx, commands.get(ctx, "echo_frame_raw"))?;
-        let message: piccolo::Value = stack.from_back(ctx)?;
-        let message = ctx.intern(&format!("{}\r\n", message).as_bytes());
+        let frame_no: Value = stack.pop_front();
+        let all_parts: Vec<String> = stack
+            .consume::<Variadic<Vec<Value>>>(ctx)?
+            .into_iter()
+            .map(|v| format!("{}", v))
+            .collect();
+        stack.push_front(frame_no);
+        let message = ctx.intern((all_parts.join(" ") + "\r\n").as_bytes());
         stack.push_back(message.into());
         Ok(piccolo::CallbackReturn::Call {
             function,

src/term_view.rs

@@ -121,8 +121,7 @@ fn get_or_make_term_frame<'a>(
                     )
                 }),
                 initial_size,
-            )
-            .into(),
+            ),
             retained_closures: None,
         };
 
@@ -207,7 +206,7 @@ pub fn echo_to_term_frame(
         .frame_registry
         .borrow()
         .get(frame_id)
-        .ok_or_else(|| "Attempt to echo to frame that doesn't exist.")?
+        .ok_or("Attempt to echo to frame that doesn't exist.")?
         .term
         .write(message);
     Ok(())