Update old cache handling

Cargo.lock

@@ -237,7 +237,7 @@ checksum = "d3fd119d74b830634cea2a0f58bbd0d54540518a14397557951e79340abc28c0"
 
 [[package]]
 name = "common"
-version = "0.9.5-masterV2"
+version = "0.9.5-masterV3"
 dependencies = [
  "criterion",
  "fastrand",
@@ -837,7 +837,7 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "swww"
-version = "0.9.5-masterV2"
+version = "0.9.5-masterV3"
 dependencies = [
  "assert_cmd",
  "clap",
@@ -850,7 +850,7 @@ dependencies = [
 
 [[package]]
 name = "swww-daemon"
-version = "0.9.5-masterV2"
+version = "0.9.5-masterV3"
 dependencies = [
  "common",
  "keyframe",

Cargo.toml

@@ -5,7 +5,7 @@ members = ["client", "daemon", "common"]
 default-members = ["client", "daemon"]
 
 [workspace.package]
-version = "0.9.5-masterV2"
+version = "0.9.5-masterV3"
 authors = ["Leonardo Gibrowski Faé <leonardo.fae44@gmail.com>"]
 edition = "2021"
 license-file = "LICENSE"

common/src/cache.rs

@@ -82,10 +82,12 @@ pub fn get_previous_image_path(output_name: &str) -> io::Result<(String, String)
         )
     })?;
 
-    if let Some(buf) = buf.split_once("\n") {
-        Ok((buf.0.to_string(), buf.1.to_string()))
-    } else {
-        Ok(("Lanczos3".to_string(), buf))
+    match buf.split_once("\n") {
+        Some(buf) => Ok((buf.0.to_string(), buf.1.to_string())),
+        None => Err(std::io::Error::new(
+            std::io::ErrorKind::Other,
+            "failed to read image filter",
+        )),
     }
 }