Synchronize deck only if necessary

Look at the modification time of the deck, and synchronize if it has
been modified after the last deck read.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/deck.rs b/src/deck.rs
index 3524c96..e0f9fab 100644
--- a/src/deck.rs
+++ b/src/deck.rs
@@ -23,7 +23,7 @@ impl std::error::Error for ParseError {
     }
 }
 
-pub fn read(deck: &String) -> Result<Vec<Entry>> {
+pub fn read(deck: &str) -> Result<Vec<Entry>> {
     let file = File::open(deck)?;
     let reader = BufReader::new(file);
     let mut entries: Vec<Entry> = Vec::new();
@@ -69,7 +69,9 @@ pub fn read(deck: &String) -> Result<Vec<Entry>> {
 }
 
 pub fn pp_from_path(path: &String) -> Option<String> {
-    Some(capitalize(Path::new(&path).with_extension("").file_name()?.to_str()?))
+    Some(capitalize(
+        Path::new(&path).with_extension("").file_name()?.to_str()?,
+    ))
 }
 
 fn capitalize(s: &str) -> String {