Add sysexits exit code

Doesn't capture input or I/O errors. Not bothering to return EX_NOINPUT
or EX_IOERR or EX_CANTCREAT because I don't want to bother creating an
error enum and variants for each case.

3 files changed, 12 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 20315d7..b765c85 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -141,6 +141,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a246d82be1c9d791c5dfde9a2bd045fc3cbba3fa2b11ad558f27d01712f00569"
 
 [[package]]
+name = "exitcode"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de853764b47027c2e862a995c34978ffa63c1501f2e15f987ba11bd4f9bba193"
+
+[[package]]
 name = "flate2"
 version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -252,6 +258,7 @@ name = "pdf-form-replace-font"
 version = "0.0.1"
 dependencies = [
  "anyhow",
+ "exitcode",
  "getopts",
  "lopdf",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 91ced45..5e06e7e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,5 +5,6 @@ edition = "2018"
 
 [dependencies]
 anyhow = "1.0.40"
+exitcode = "1.1.2"
 getopts = "0.2.21"
 lopdf = "0.26.0"
diff --git a/src/main.rs b/src/main.rs
index 492707f..957dbe6 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,10 @@
 use anyhow::{self, Context};
+use exitcode;
 use getopts::Options;
 use lopdf::{Document, Object};
 
 use std::env;
+use std::process;
 
 
 fn main() {
@@ -10,6 +12,8 @@ fn main() {
         Ok(_) => (),
         Err(e) => {
             eprintln!("error: {}", e);
+
+            process::exit(exitcode::SOFTWARE);
         },
     };
 }