use lazy-static regular expressions

Author: nikomatsakis

Cargo.lock

@@ -14,4 +14,5 @@ serde = "1.0.204"
 serde_json = "1.0.120"
 structopt = "0.3.26"
 walkdir = "2.5.0"
-rust_team_data = { git = "https://github.com/rust-lang/team" }
+rust_team_data = { git = "https://github.com/rust-lang/team" }
+lazy_static = "1.5.0"

mdbook-goals/Cargo.toml

@@ -6,6 +6,7 @@ use std::{collections::BTreeSet, path::PathBuf};
 use anyhow::Context;
 use regex::Regex;
 
+use crate::re::USERNAME;
 use crate::team::{self, TeamName};
 use crate::util::{commas, markdown_files};
 use crate::{

mdbook-goals/src/goal.rs

@@ -9,6 +9,7 @@ use walkdir::WalkDir;
 mod goal;
 mod markwaydown;
 mod mdbook_preprocessor;
+mod re;
 mod rfc;
 mod team;
 mod util;

mdbook-goals/src/main.rs

@@ -34,10 +34,10 @@ impl Preprocessor for GoalPreprocessor {
 }
 
 pub struct GoalPreprocessorWithContext<'c> {
-    team_asks: Regex,
-    goal_list: Regex,
-    goal_count: Regex,
-    username: Regex,
+    team_asks: &'static Regex,
+    goal_list: &'static Regex,
+    goal_count: &'static Regex,
+    username: &'static Regex,
     ctx: &'c PreprocessorContext,
     links: Vec<(String, String)>,
     linkifiers: Vec<(Regex, String)>,
@@ -113,10 +113,10 @@ impl<'c> GoalPreprocessorWithContext<'c> {
 
         Ok(GoalPreprocessorWithContext {
             ctx,
-            team_asks: Regex::new(r"<!-- TEAM ASKS -->")?,
-            goal_list: Regex::new(r"<!-- GOALS `(.*)` -->")?,
-            goal_count: Regex::new(r"<!-- #GOALS -->")?,
-            username: Regex::new(r"@([-a-zA-Z0-9])+")?,
+            team_asks: &re::TEAM_ASKS,
+            goal_list: &re::GOAL_LIST,
+            goal_count: &re::GOAL_COUNT,
+            username: &re::USERNAME,
             links,
             linkifiers,
             display_names,

mdbook-goals/src/mdbook_preprocessor.rs

@@ -0,0 +1,18 @@
+use lazy_static::lazy_static;
+use regex::Regex;
+
+lazy_static! {
+    pub static ref TEAM_ASKS: Regex = Regex::new(r"<!-- TEAM ASKS -->").unwrap();
+}
+
+lazy_static! {
+    pub static ref GOAL_LIST: Regex = Regex::new(r"<!-- GOALS `(.*)` -->").unwrap();
+}
+
+lazy_static! {
+    pub static ref GOAL_COUNT: Regex = Regex::new(r"<!-- #GOALS -->").unwrap();
+}
+
+lazy_static! {
+    pub static ref USERNAME: Regex = Regex::new(r"@([-a-zA-Z0-9])+").unwrap();
+}