refactor: remove unused MetaPluginType::None and related code

src/main.rs

@@ -126,7 +126,7 @@ struct ItemArgs {
     #[arg(help("Compression algorithm to use when saving items"))]
     compression: Option<String>,
 
-    #[arg(help_heading("Item Options"), short, long, env("KEEP_META_PLUGINS"))]
+    #[arg(help_heading("Item Options"), short('M'), long, env("KEEP_META_PLUGINS"))]
     #[arg(help("Meta plugins to use when saving items"))]
     meta_plugins: Vec<String>,
 }

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,
+    FileMagic
-    None,
 }
 
 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
-}

src/meta_plugin/none.rs

@@ -1,43 +0,0 @@
-use anyhow::Result;
-use log::*;
-use std::io::{self, Write};
-
-#[derive(Debug, Eq, PartialEq, Clone, Default)]
-pub struct MetaPluginNone {}
-
-impl MetaPluginNone {
-    pub fn new() -> MetaPluginNone {
-        MetaPluginNone {}
-    }
-}
-
-impl MetaPlugin for MetaPluginNone {
-    fn create(&self) -> Result<Box<dyn Write>> {
-        Ok(Box::new(DummyWriter::new()))
-    }
-
-    fn finalize(&mut self) -> io::Result<String> {
-        Ok("none".to_string())
-    }
-
-    fn update(&mut self, _data: &[u8]) {}
-}
-
-// Dummy writer that implements Write for the none meta plugin
-struct DummyWriter;
-
-impl DummyWriter {
-    fn new() -> Self {
-        DummyWriter
-    }
-}
-
-impl Write for DummyWriter {
-    fn write(&mut self, _buf: &[u8]) -> io::Result<usize> {
-        Ok(0)
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}

src/modes/status.rs

@@ -180,12 +180,9 @@ fn build_meta_plugin_table() -> Table {
     meta_plugin_table.set_titles(row!(
         b->"Type",
         b->"Found",
-        b->"Default",
         b->"Binary",
         b->"Args"));
 
-    let default_type = meta_plugin::default_meta_plugin_type();
-
     for meta_plugin_type in MetaPluginType::iter() {
         let meta_plugin_program: MetaPluginProgram = match &META_PLUGIN_PROGRAMS[meta_plugin_type.clone()] {
             Some(meta_plugin_program) => meta_plugin_program.clone(),
@@ -196,18 +193,12 @@ fn build_meta_plugin_table() -> Table {
             },
         };
 
-        let is_default = meta_plugin_type == default_type;
-
         meta_plugin_table.add_row(Row::new(vec![
             Cell::new(&meta_plugin_type.to_string()),
             match meta_plugin_program.supported {
                 true => Cell::new("Yes").with_style(Attr::ForegroundColor(color::GREEN)),
                 false => Cell::new("No").with_style(Attr::ForegroundColor(color::RED)),
             },
-            match is_default {
-                true => Cell::new("Yes").with_style(Attr::ForegroundColor(color::GREEN)),
-                false => Cell::new("No"),
-            },
             match meta_plugin_program.program.is_empty() {
                 true => {
                     Cell::new("<INTERNAL>").with_style(Attr::ForegroundColor(color::BRIGHT_BLACK))