Add ability to specify which meta columns are listed

src/main.rs

@@ -481,14 +481,12 @@ fn mode_list(cmd: &mut Command, args: Args, ids: &mut Vec<i64>, tags: &Vec<Strin
         let mut item_meta: HashMap<String, String> = HashMap::new();
 
         for meta in db::get_item_meta(conn, item)? {
-            meta_columns.insert(meta.name.clone());
             item_meta.insert(meta.name.clone(), meta.value);
         }
         meta_by_item.insert(item_id, item_meta);
     };
 
-    let mut meta_columns_sorted = Vec::from_iter(meta_columns);
-    meta_columns_sorted.sort();
+    let meta_columns = args.options.list_meta.split(",");
 
     let mut table = Table::new();
     if std::io::stdout().is_terminal() {
@@ -506,7 +504,7 @@ fn mode_list(cmd: &mut Command, args: Args, ids: &mut Vec<i64>, tags: &Vec<Strin
         b->"Tags",
     );
 
-    for name in &meta_columns_sorted {
+    for name in meta_columns.clone() {
         title_row.add_cell(Cell::new(name).with_style(Attr::Bold));
     }
 
@@ -535,7 +533,7 @@ fn mode_list(cmd: &mut Command, args: Args, ids: &mut Vec<i64>, tags: &Vec<Strin
         let mut table_row = Row::new(vec![id_cell,ts_cell,size_cell, compression_cell, file_size_cell, tags_cell]);
 
         let item_meta = meta_by_item.get(&item_id).unwrap();
-        for name in &meta_columns_sorted {
+        for name in meta_columns.clone() {
             match item_meta.get(name) {
                 Some(value) => table_row.add_cell(Cell::new(value)),
                 None => table_row.add_cell(Cell::new(""))