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.
This commit is contained in:
Nathan Vegdahl 2020-02-02 17:20:00 +09:00
parent 8a49ed74c5
commit dd40937cfa
3 changed files with 267 additions and 126 deletions

351
Cargo.lock generated
View File

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View File

@ -22,6 +22,7 @@ unicode-width = "0.1"
clap = "2"
smallvec = "1"
crossterm = "0.14"
gag = "0.1.10"
# Local crate dependencies
[dependencies.backend]

View File

@ -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 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);
}
}
}