refactor: remove unused MetaPluginType::None and related code

src/meta_plugin.rs

@@ -7,10 +7,8 @@ extern crate enum_map;
 use enum_map::enum_map;
 use enum_map::{Enum, EnumMap};
 
-pub mod none;
 pub mod program;
 
-use crate::meta_plugin::none::MetaPluginNone;
 use crate::meta_plugin::program::MetaPluginProgram;
 
 use strum::IntoEnumIterator;
@@ -18,8 +16,7 @@ use strum::IntoEnumIterator;
 #[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString, Enum)]
 #[strum(ascii_case_insensitive)]
 pub enum MetaPluginType {
-    FileMagic,
-    None,
+    FileMagic
 }
 
 pub trait MetaPlugin {
@@ -41,25 +38,11 @@ lazy_static! {
             let program = MetaPluginProgram::new("file", vec!["-bE", "-"]);
             if program.supported { Some(program) } else { None }
         }
-        MetaPluginType::None => None
     };
 }
 
 pub fn get_meta_plugin(meta_plugin_type: MetaPluginType) -> Box<dyn MetaPlugin> {
     match meta_plugin_type {
         MetaPluginType::FileMagic => Box::new(MetaPluginProgram::new("file", vec!["-bE", "-"])),
-        MetaPluginType::None => Box::new(MetaPluginNone::new()),
     }
 }
-
-pub fn default_meta_plugin_type() -> MetaPluginType {
-    let mut default = MetaPluginType::None;
-    for meta_plugin_type in MetaPluginType::iter() {
-        let meta_plugin = get_meta_plugin(meta_plugin_type.clone());
-        if meta_plugin.is_supported() {
-            default = meta_plugin_type;
-            break;
-        }
-    }
-    default
-}