From a1445b0f3bd8fe4fabd0ffda3eebca3cb94a5db8 Mon Sep 17 00:00:00 2001
From: Daniel Gray <the.daniel.gray@gmail.com>
Date: Fri, 17 Jan 2020 11:11:51 -0400
Subject: [PATCH] imp: Add exitcode::USAGE exit code as suggested in #1327

The reason to do this is described well in issue #1327. It is also a
recommendation of the Rust book itself:
https://rust-cli.github.io/book/in-depth/exit-code.html
---
 Cargo.toml           | 1 +
 src/build/app/mod.rs | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index d0ea231ef4d..4bbeda51f76 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,6 +49,7 @@ maintenance = {status = "actively-developed"}
 
 [dependencies]
 bitflags              = "1.2"
+exitcode              = "1.1.2"
 unicode-width         = "0.1.4"
 textwrap              = "0.11"
 indexmap              = "1.0.1"
diff --git a/src/build/app/mod.rs b/src/build/app/mod.rs
index 27a13961203..95e56e880fc 100644
--- a/src/build/app/mod.rs
+++ b/src/build/app/mod.rs
@@ -1193,7 +1193,7 @@ impl<'b> App<'b> {
                         i.lock().read_line(&mut s).unwrap();
                     }
                     drop(e);
-                    process::exit(1);
+                    process::exit(exitcode::USAGE);
                 }
 
                 e.exit()
@@ -1268,7 +1268,7 @@ impl<'b> App<'b> {
                 }
                 drop(self);
                 drop(e);
-                process::exit(1);
+                process::exit(exitcode::USAGE);
             }
 
             drop(self);