From 0fa5b304ed57517ba04b7a42ff30258e456972f8 Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Sun, 14 Mar 2021 03:42:16 +0100
Subject: Exit with sysexits.h error codes on error

---
 Cargo.lock  |  7 +++++++
 Cargo.toml  |  1 +
 src/main.rs | 16 +++++++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 047960a..f5844c4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -64,6 +64,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "exitcode"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de853764b47027c2e862a995c34978ffa63c1501f2e15f987ba11bd4f9bba193"
+
 [[package]]
 name = "hashbrown"
 version = "0.7.2"
@@ -90,6 +96,7 @@ name = "ottolangy"
 version = "0.0.1"
 dependencies = [
  "anyhow",
+ "exitcode",
  "mailparse",
  "thiserror",
  "whatlang",
diff --git a/Cargo.toml b/Cargo.toml
index 97e4592..439c05f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1.0.38"
+exitcode = "1.1.2"
 mailparse = "0.13.2"
 thiserror = "1.0.24"
 whatlang = "0.11.1"
diff --git a/src/main.rs b/src/main.rs
index 2775155..a50b42d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,6 +14,7 @@
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 use anyhow::{anyhow, Context, Error};
+use exitcode;
 use mailparse;
 use thiserror;
 use whatlang::{self, Lang};
@@ -21,6 +22,7 @@ use xdg;
 
 use std::fs::File;
 use std::io::{self, Read, Write};
+use std::process;
 
 
 const PROGRAM_NAME: &'static str = "ottolangy";
@@ -59,7 +61,19 @@ enum OttolangyError {
 fn main() {
     match run() {
         Ok(_) => (),
-        Err(e) => eprintln!("{}: error: {}", PROGRAM_NAME, e),
+        Err(e) => {
+            eprintln!("{}: error: {}", PROGRAM_NAME, e);
+
+            match e.downcast_ref::<OttolangyError>() {
+                Some(OttolangyError::ParseMail(_)) =>
+                    process::exit(exitcode::DATAERR),
+                Some(OttolangyError::ParseMailUnknown) =>
+                    process::exit(exitcode::DATAERR),
+                Some(OttolangyError::Xdg(_)) => process::exit(exitcode::IOERR),
+                Some(OttolangyError::Io(_)) => process::exit(exitcode::IOERR),
+                None => process::exit(exitcode::UNAVAILABLE),
+            }
+        },
     }
 }
 
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