Use lazy_static for parse_choice regex

4 files changed, 10 insertions, 3 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 99a13bd..fbee6a8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,6 +34,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "choose"
 version = "0.1.3"
 dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index a9bbe48..36026c6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,3 +9,4 @@ edition = "2018"
 [dependencies]
 structopt = "0.3.0"
 regex = "1"
+lazy_static = "1"
diff --git a/src/config.rs b/src/config.rs
index 9814a85..afca365 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -32,6 +32,10 @@ pub struct Opt {
     pub choice: Vec<Choice>,
 }
 
+lazy_static! {
+    static ref PARSE_CHOICE_RE: Regex = Regex::new(r"^(\d*):(\d*)$").unwrap();
+}
+
 pub struct Config {
     pub opt: Opt,
     pub separator: Regex,
@@ -77,9 +81,7 @@ impl Config {
     }
 
     pub fn parse_choice(src: &str) -> Result<Choice, ParseIntError> {
-        let re = Regex::new(r"^(\d*):(\d*)$").unwrap();
-
-        let cap = match re.captures_iter(src).next() {
+        let cap = match PARSE_CHOICE_RE.captures_iter(src).next() {
             Some(v) => v,
             None => match src.parse() {
                 Ok(x) => return Ok(Choice::new(x, x)),
diff --git a/src/main.rs b/src/main.rs
index e80f98f..b812462 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,9 @@ use std::fs::File;
 use std::io::{self, Read, Write};
 use structopt::StructOpt;
 
+#[macro_use]
+extern crate lazy_static;
+
 mod choice;
 mod config;
 mod reader;