use lazy_static so we do not compile regex multiple times

libimagstore/Cargo.toml

@@ -6,6 +6,7 @@ authors = ["Matthias Beyer <mail@beyermatthias.de>"]
 [dependencies]
 fs2 = "0.2.2"
 glob = "0.2.10"
+lazy_static = "0.1.15"
 log = "0.3.5"
 regex = "0.1.47"
 semver = "0.2"

libimagstore/src/lib.rs

@@ -2,6 +2,7 @@
 #[macro_use] extern crate version;
 extern crate fs2;
 extern crate glob;
+#[macro_use] extern crate lazy_static;
 extern crate regex;
 extern crate toml;
 #[cfg(test)] extern crate tempdir;

libimagstore/src/store.rs

@@ -870,14 +870,16 @@ impl Entry {
 
     pub fn from_str(loc: StoreId, s: &str) -> Result<Entry> {
         debug!("Building entry from string");
-        let re = Regex::new(r"(?smx)
-            ^---$
-            (?P<header>.*) # Header
-            ^---$\n
-            (?P<content>.*) # Content
-        ").unwrap();
+        lazy_static! {
+            static ref RE: Regex = Regex::new(r"(?smx)
+                ^---$
+                (?P<header>.*) # Header
+                ^---$\n
+                (?P<content>.*) # Content
+            ").unwrap();
+        }
 
-        let matches = re.captures(s);
+        let matches = RE.captures(s);
 
         if matches.is_none() {
             return Err(StoreError::new(StoreErrorKind::MalformedEntry, None));