have eval streams also emit start events

5 files changed, 47 insertions, 16 deletions

diff --git a/src/builtins.rs b/src/builtins.rs
index d130907..2393e89 100644
--- a/src/builtins.rs
+++ b/src/builtins.rs
@@ -41,6 +41,7 @@ pub fn exec(cmd: &str, args: &[String]) -> Result<Builtin> {
 pub struct Builtin {
     cmd: String,
     args: Vec<String>,
+    started: bool,
     done: bool,
 }
 
@@ -50,6 +51,7 @@ impl Builtin {
             "cd" => Ok(Self {
                 cmd: cmd.to_string(),
                 args: args.to_vec(),
+                started: false,
                 done: false,
             }),
             _ => Err(Error::UnknownBuiltin {
@@ -65,22 +67,30 @@ impl futures::stream::Stream for Builtin {
     type Error = Error;
 
     fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
-        if self.done {
-            return Ok(futures::Async::Ready(None));
+        if !self.started {
+            self.started = true;
+            Ok(futures::Async::Ready(Some(
+                crate::eval::CommandEvent::CommandStart(
+                    self.cmd.clone(),
+                    self.args.clone(),
+                ),
+            )))
+        } else if !self.done {
+            self.done = true;
+            let res = match self.cmd.as_ref() {
+                "cd" => cd(&self.args),
+                _ => Err(Error::UnknownBuiltin {
+                    cmd: self.cmd.clone(),
+                }),
+            };
+            res.map(|_| {
+                futures::Async::Ready(Some(
+                    crate::eval::CommandEvent::BuiltinExit,
+                ))
+            })
+        } else {
+            Ok(futures::Async::Ready(None))
         }
-
-        self.done = true;
-        let res = match self.cmd.as_ref() {
-            "cd" => cd(&self.args),
-            _ => Err(Error::UnknownBuiltin {
-                cmd: self.cmd.clone(),
-            }),
-        };
-        res.map(|_| {
-            futures::Async::Ready(Some(
-                crate::eval::CommandEvent::BuiltinExit,
-            ))
-        })
     }
 }
 
diff --git a/src/eval.rs b/src/eval.rs
index dd68412..5f789b3 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -35,6 +35,7 @@ pub fn eval(line: &str) -> Result<Eval> {
 }
 
 pub enum CommandEvent {
+    CommandStart(String, Vec<String>),
     Output(Vec<u8>),
     ProcessExit(std::process::ExitStatus),
     BuiltinExit,
diff --git a/src/main.rs b/src/main.rs
index 3155564..30b4f14 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@
 // clippy::cargo seems to be broken with rls currently
 // #![warn(clippy::cargo)]
 #![allow(clippy::collapsible_if)]
+#![allow(clippy::if_not_else)]
 #![allow(clippy::module_name_repetitions)]
 #![allow(clippy::multiple_crate_versions)]
 #![allow(clippy::single_match)]
diff --git a/src/process.rs b/src/process.rs
index 090824a..81899d7 100644
--- a/src/process.rs
+++ b/src/process.rs
@@ -46,7 +46,10 @@ pub struct RunningProcess {
     // TODO: tokio::io::Stdin is broken
     // input: tokio::io::Stdin,
     input: tokio::reactor::PollEvented2<EventedStdin>,
+    cmd: String,
+    args: Vec<String>,
     buf: Vec<u8>,
+    started: bool,
     output_done: bool,
     exit_done: bool,
     _screen: crossterm::RawScreen,
@@ -70,7 +73,10 @@ impl RunningProcess {
             pty,
             process,
             input,
+            cmd: cmd.to_string(),
+            args: args.to_vec(),
             buf: Vec::with_capacity(4096),
+            started: false,
             output_done: false,
             exit_done: false,
             _screen: crossterm::RawScreen::into_raw_mode()
@@ -85,6 +91,16 @@ impl futures::stream::Stream for RunningProcess {
     type Error = Error;
 
     fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Self::Error> {
+        if !self.started {
+            self.started = true;
+            return Ok(futures::Async::Ready(Some(
+                crate::eval::CommandEvent::CommandStart(
+                    self.cmd.clone(),
+                    self.args.clone(),
+                ),
+            )));
+        }
+
         let ready = mio::Ready::readable();
         let input_poll = self.input.poll_read_ready(ready);
         match input_poll {
diff --git a/src/repl.rs b/src/repl.rs
index 30d852e..2df42a8 100644
--- a/src/repl.rs
+++ b/src/repl.rs
@@ -24,8 +24,11 @@ pub fn repl() {
         }
 
         let repl = read().and_then(|line| {
-            eprint!("running '{}'\r\n", line);
             eval(&line).fold(None, |acc, event| match event {
+                crate::eval::CommandEvent::CommandStart(cmd, args) => {
+                    eprint!("running '{} {:?}'\r\n", cmd, args);
+                    futures::future::ok(acc)
+                }
                 crate::eval::CommandEvent::Output(out) => match print(&out) {
                     Ok(()) => futures::future::ok(acc),
                     Err(e) => futures::future::err(e),