fix: update md5 usage and remove unused imports

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/digest.rs

@@ -1,10 +1,10 @@
 use sha2::{Digest, Sha256, Sha512};
-use md5::Md5;
-use crate::meta_plugin::{MetaPlugin, process_metadata_outputs};
+use md5;
+use crate::meta_plugin::MetaPlugin;
 
 #[derive(Debug, Clone)]
 enum Hasher {
-    Md5(Md5),
+    Md5(md5::Context),
     Sha256(Sha256),
     Sha512(Sha512),
 }
@@ -21,7 +21,7 @@ impl Hasher {
     fn finalize(&mut self) -> String {
         match self {
             Hasher::Md5(hasher) => {
-                let result = std::mem::replace(hasher, Md5::new()).finalize();
+                let result = hasher.clone().compute();
                 format!("{:x}", result)
             }
             Hasher::Sha256(hasher) => {
@@ -100,7 +100,7 @@ impl DigestMetaPlugin {
         if let Some(method_value) = plugin.options.get("method") {
             if let Some(method_str) = method_value.as_str() {
                 plugin.hasher = match method_str {
-                    "md5" => Some(Hasher::Md5(Md5::new())),
+                    "md5" => Some(Hasher::Md5(md5::Context::new())),
                     "sha256" => Some(Hasher::Sha256(Sha256::new())),
                     "sha512" => Some(Hasher::Sha512(Sha512::new())),
                     _ => None,

src/services/item_service.rs

@@ -346,7 +346,7 @@ impl ItemService {
             MetaPluginType::Binary,
             MetaPluginType::LineCount,
             MetaPluginType::WordCount,
-            MetaPluginType::DigestSha256,
+            MetaPluginType::Digest,
             MetaPluginType::User,
             MetaPluginType::Hostname,
         ];

src/services/meta_service.rs

@@ -1,6 +1,6 @@
 use crate::config::Settings;
 use crate::meta_plugin::{get_meta_plugin, MetaPlugin, MetaPluginType};
-use crate::modes::common::{settings_digest_type, settings_meta_plugin_types};
+use crate::modes::common::settings_meta_plugin_types;
 use clap::Command;
 use log::debug;
 use rusqlite::Connection;