From cedc70af3a2b36d3a93b721ec60a571a74f15a55 Mon Sep 17 00:00:00 2001
From: Kasper <kasperkh.kh@gmail.com>
Date: Sat, 3 Jul 2021 02:09:28 +0200
Subject: [PATCH] Add `--version` flag

---
 CHANGELOG.md | 3 ++-
 src/main.rs  | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f92bb8..a44418a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## Next
-- Freak out instead of ignoring unexpected arguments
 - Add support for non-US "metre" and "litre" spellings
+- Add `--version` flag
+- Freak out instead of ignoring unexpected arguments
 - Fix decimeter parsed as centimeter
 
 ## 1.5.1 - 2021 Jun 10
diff --git a/src/main.rs b/src/main.rs
index 3af4fce..6f593e2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,8 @@ use cpc::eval;
 use cpc::units::Unit;
 use std::process::exit;
 
+const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+
 /// CLI interface
 fn main() {
   use std::env;
@@ -12,6 +14,10 @@ fn main() {
   for arg in args {
     match arg.as_str() {
       "-v" | "--verbose" => verbose = true,
+      "--version" => {
+        println!("{}", VERSION);
+        exit(0);
+      },
       _ => {
         if expression_opt == None {
           expression_opt = Some(arg);