From dd40937cfaad2f8d80c0d66a61fa788e018eb921 Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Sun, 2 Feb 2020 17:20:00 +0900
Subject: [PATCH] Capture stderr output so that it can be printed after exit.

Otherwise is was just getting swallowed in the alternate terminal
buffer.  This was especially annoying with panics, since their
messages and backtraces got completely swallowed.
---
 Cargo.lock  | 351 ++++++++++++++++++++++++++++++++++------------------
 Cargo.toml  |   1 +
 src/main.rs |  41 +++++-
 3 files changed, 267 insertions(+), 126 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 18445d1..c715438 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,394 +4,499 @@
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- "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backend",
+ "clap",
+ "crossterm",
+ "gag",
+ "ropey",
+ "smallvec 1.2.0",
+ "unicode-segmentation",
+ "unicode-width",
 ]
 
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+ "winapi 0.3.8",
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 [[package]]
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- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "winapi 0.3.8",
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 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
+
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
 [[package]]
 name = "winapi"
 version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 
 [[package]]
 name = "winapi"
 version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
 dependencies = [
- "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
 ]
 
 [[package]]
 name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 
 [[package]]
 name = "winapi-i686-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
 [[package]]
 name = "ws2_32-sys"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
 dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.2.8",
+ "winapi-build",
 ]
-
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diff --git a/Cargo.toml b/Cargo.toml
index 2ba5c5f..2aeb18b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ unicode-width = "0.1"
 clap = "2"
 smallvec = "1"
 crossterm = "0.14"
+gag = "0.1.10"
 
 # Local crate dependencies
 [dependencies.backend]
diff --git a/src/main.rs b/src/main.rs
index 6e79088..67cbd87 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,10 @@
+use std::{
+    io::{Read, Write},
+    path::Path,
+};
+
 use clap::{App, Arg};
 use editor::Editor;
-use std::path::Path;
 use term_ui::formatter::ConsoleLineFormatter;
 use term_ui::TermUI;
 
@@ -33,7 +37,38 @@ fn main() {
         Editor::new(ConsoleLineFormatter::new(4))
     };
 
+    // Redirect stderr to an internal buffer, so we can print it after exiting.
+    let stderr_buf = gag::BufferRedirect::stderr().unwrap();
+
     // Initialize and start UI
-    let mut ui = TermUI::new_from_editor(editor);
-    ui.main_ui_loop();
+    let exec_result = std::panic::catch_unwind(|| {
+        let mut ui = TermUI::new_from_editor(editor);
+        ui.main_ui_loop();
+    });
+
+    // Check for panics.  If we did panic, exit from raw mode and the alternate
+    // screen before propagating the panic, so that the panic printout actually
+    // goes to a visible and scrollable screen.
+    match exec_result {
+        Ok(_) => {
+            // Print captured stderr.
+            let mut msg = String::new();
+            stderr_buf.into_inner().read_to_string(&mut msg).unwrap();
+            eprint!("{}", msg);
+        }
+        Err(e) => {
+            // Exit raw alt screen.
+            crossterm::terminal::disable_raw_mode().unwrap();
+            crossterm::execute!(std::io::stdout(), crossterm::terminal::LeaveAlternateScreen)
+                .unwrap();
+
+            // Print captured stderr.
+            let mut msg = String::new();
+            stderr_buf.into_inner().read_to_string(&mut msg).unwrap();
+            eprint!("{}", msg);
+
+            // Resume panic unwind.
+            std::panic::resume_unwind(e);
+        }
+    }
 }