remove quick_error

quick_error used the deprecated Error::cause interface, therefore we
want to use our own error enums with proper methods.

1 files changed, 24 insertions, 17 deletions

diff --git a/src/cache.rs b/src/cache.rs
index f64b45a..2b490ec 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,18 +1,31 @@
 //! Caching support to prevent hitting the API a lot.
-use std::fs::File;
-use std::io::prelude::*;
-use std::path::Path;
+use std::{error::Error, fmt, fs, path::Path};
 
 use xdg::BaseDirectories;
 
 use super::APP_NAME;
 
-quick_error! {
-    #[derive(Debug)]
-    pub enum CacheError {
-        Io(err: std::io::Error) {
-            cause(err)
-            from()
+#[derive(Debug)]
+pub enum CacheError {
+    Io(std::io::Error),
+}
+
+error_froms! { CacheError,
+    err: std::io::Error => CacheError::Io(err),
+}
+
+impl fmt::Display for CacheError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            CacheError::Io(_) => write!(f, "cache input/output error"),
+        }
+    }
+}
+
+impl Error for CacheError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match *self {
+            CacheError::Io(ref err) => Some(err),
         }
     }
 }
@@ -39,20 +52,14 @@ impl FileCache {
 impl Cache for FileCache {
     fn store(&mut self, path: &Path, data: &[u8]) -> Result<(), CacheError> {
         let cache_path = self.dirs.place_cache_file(path).unwrap();
-        let mut f = File::create(cache_path)?;
-        f.write_all(data)?;
+        fs::write(cache_path, data)?;
         Ok(())
     }
 
     fn get(&mut self, path: &Path) -> Result<Option<Vec<u8>>, CacheError> {
         let cache_path = self.dirs.find_cache_file(path);
         match cache_path {
-            Some(p) => {
-                let mut f = File::open(p)?;
-                let mut buffer = Vec::new();
-                f.read_to_end(&mut buffer)?;
-                Ok(Some(buffer))
-            }
+            Some(path) => Ok(Some(fs::read(path)?)),
             None => Ok(None),
         }
     }