From 2510f46e32ade9f7c3f6d2546e8a7338f4c27cd7 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Tue, 9 Jul 2019 03:14:26 -0400
Subject: use context instead of map_err for futures and streams

---
 src/eval.rs  | 14 +++-----------
 src/repl.rs  |  5 +++--
 src/state.rs |  2 +-
 src/tui.rs   |  9 ++++-----
 4 files changed, 11 insertions(+), 19 deletions(-)

(limited to 'src')

diff --git a/src/eval.rs b/src/eval.rs
index 549650d..af3de9e 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -1,4 +1,4 @@
-use futures::stream::Stream as _;
+use snafu::futures01::StreamExt as _;
 use snafu::ResultExt as _;
 
 #[derive(Debug, snafu::Snafu)]
@@ -56,19 +56,11 @@ impl Eval {
             dyn futures::stream::Stream<Item = CommandEvent, Error = Error>
                 + Send,
         > = if let Ok(s) = builtin_stream {
-            Box::new(s.map_err(move |e| Error::BuiltinExecution {
-                cmd: cmd.clone(),
-                source: e,
-            }))
+            Box::new(s.context(BuiltinExecution { cmd }))
         } else {
             let process_stream = crate::process::spawn(&cmd, &args);
             match process_stream {
-                Ok(s) => {
-                    Box::new(s.map_err(move |e| Error::ProcessExecution {
-                        cmd: cmd.clone(),
-                        source: e,
-                    }))
-                }
+                Ok(s) => Box::new(s.context(ProcessExecution { cmd })),
                 Err(e) => {
                     return Err(e).context(Command { cmd });
                 }
diff --git a/src/repl.rs b/src/repl.rs
index aa80132..cac6649 100644
--- a/src/repl.rs
+++ b/src/repl.rs
@@ -1,5 +1,6 @@
 use futures::future::{Future as _, IntoFuture as _};
 use futures::stream::Stream as _;
+use snafu::futures01::{FutureExt as _, StreamExt as _};
 use snafu::ResultExt as _;
 use std::io::Write as _;
 
@@ -53,7 +54,7 @@ fn read() -> impl futures::future::Future<Item = String, Error = Error> {
     crate::readline::readline("$ ", true)
         .into_future()
         .flatten()
-        .map_err(|e| Error::Read { source: e })
+        .context(Read)
 }
 
 fn eval(
@@ -63,7 +64,7 @@ fn eval(
     crate::eval::eval(line)
         .into_future()
         .flatten_stream()
-        .map_err(|e| Error::Eval { source: e })
+        .context(Eval)
 }
 
 fn print(event: &crate::eval::CommandEvent) -> Result<()> {
diff --git a/src/state.rs b/src/state.rs
index 652911c..b9707c0 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -136,7 +136,7 @@ impl futures::future::Future for State {
                     .unwrap()
                     .future
                     .poll()
-                    .map_err(|e| Error::Eval { source: e })?
+                    .context(Eval)?
                 {
                     futures::Async::Ready(Some(event)) => match event {
                         crate::eval::CommandEvent::CommandStart(
diff --git a/src/tui.rs b/src/tui.rs
index 88a169d..b7af752 100644
--- a/src/tui.rs
+++ b/src/tui.rs
@@ -1,5 +1,6 @@
 use futures::future::{Future as _, IntoFuture as _};
 use futures::sink::Sink as _;
+use snafu::futures01::FutureExt as _;
 use std::io::Write as _;
 
 #[derive(Debug, snafu::Snafu)]
@@ -38,10 +39,8 @@ pub fn tui() {
                 .and_then(move |line| {
                     let (res, req) = futures::sync::oneshot::channel();
                     w.send(crate::state::StateEvent::Line(idx, line, res))
-                        .map_err(|e| Error::Sending { source: e })
-                        .and_then(|_| {
-                            req.map_err(|e| Error::Receiving { source: e })
-                        })
+                        .context(Sending)
+                        .and_then(|_| req.context(Receiving))
                 })
                 .then(move |res| match res {
                     // successful run or empty input means prompt again
@@ -72,7 +71,7 @@ fn read() -> impl futures::future::Future<Item = String, Error = Error> {
     crate::readline::readline("$ ", true)
         .into_future()
         .flatten()
-        .map_err(|e| Error::Read { source: e })
+        .context(Read)
 }
 
 fn error(e: &Error) {
-- 
cgit v1.2.3-54-g00ecf