refactor: pull out more methods, remove unused Option

src/display.rs

@@ -125,9 +125,9 @@ impl DrawData<'_> {
 
 pub fn draw_it(
     idd: InitialDisplayData,
+    root_node: &DisplayNode,
     no_percent_bars: bool,
     terminal_width: usize,
-    root_node: &DisplayNode,
     skip_total: bool,
 ) {
     let num_chars_needed_on_left_most = if idd.by_filecount {

src/filter.rs

@@ -25,49 +25,44 @@ pub fn get_biggest(
     display_data: AggregateData,
     by_filetime: &Option<FileTime>,
     keep_collapsed: HashSet<PathBuf>,
-) -> Option<DisplayNode> {
-    if top_level_nodes.is_empty() {
-        // perhaps change this, bring back Error object?
-        return None;
-    }
+) -> DisplayNode {
     let mut heap = BinaryHeap::new();
     let number_top_level_nodes = top_level_nodes.len();
     let root;
 
-    if number_top_level_nodes > 1 {
-        let size = if by_filetime.is_some() {
-            top_level_nodes
-                .iter()
-                .map(|node| node.size)
-                .max()
-                .unwrap_or(0)
-        } else {
-            top_level_nodes.iter().map(|node| node.size).sum()
-        };
-
-        let nodes = handle_duplicate_top_level_names(top_level_nodes, display_data.short_paths);
-
-        root = Node {
-            name: PathBuf::from("(total)"),
-            size,
-            children: nodes,
-            inode_device: None,
-            depth: 0,
-        };
-
-        // Always include the base nodes if we add a 'parent' (total) node
-        heap = always_add_children(&display_data, &root, heap);
+    if number_top_level_nodes == 0 {
+        root = total_node_builder(0, vec![])
     } else {
-        root = top_level_nodes.into_iter().next().unwrap();
+        if number_top_level_nodes > 1 {
+            let size = if by_filetime.is_some() {
+                top_level_nodes
+                    .iter()
+                    .map(|node| node.size)
+                    .max()
+                    .unwrap_or(0)
+            } else {
+                top_level_nodes.iter().map(|node| node.size).sum()
+            };
+
+            let nodes = handle_duplicate_top_level_names(top_level_nodes, display_data.short_paths);
+            root = total_node_builder(size, nodes);
+        } else {
+            root = top_level_nodes.into_iter().next().unwrap();
+        }
         heap = add_children(&display_data, &root, heap);
     }
 
-    Some(fill_remaining_lines(
-        heap,
-        &root,
-        display_data,
-        keep_collapsed,
-    ))
+    fill_remaining_lines(heap, &root, display_data, keep_collapsed)
+}
+
+fn total_node_builder(size: u64, children: Vec<Node>) -> Node {
+    Node {
+        name: PathBuf::from("(total)"),
+        size,
+        children,
+        inode_device: None,
+        depth: 0,
+    }
 }
 
 pub fn fill_remaining_lines<'a>(

src/filter_type.rs

@@ -15,7 +15,7 @@ pub fn get_all_file_types(
     top_level_nodes: &[Node],
     n: usize,
     by_filetime: &Option<FileTime>,
-) -> Option<DisplayNode> {
+) -> DisplayNode {
     let ext_nodes = {
         let mut extension_cumulative_sizes = HashMap::new();
         build_by_all_file_types(top_level_nodes, &mut extension_cumulative_sizes);
@@ -67,13 +67,11 @@ pub fn get_all_file_types(
         displayed.iter().map(|node| node.size).sum()
     };
 
-    let result = DisplayNode {
+    DisplayNode {
         name: PathBuf::from("(total)"),
         size: actual_size,
         children: displayed,
-    };
-
-    Some(result)
+    }
 }
 
 fn build_by_all_file_types<'a>(

src/main.rs

@@ -11,6 +11,9 @@ mod progress;
 mod utils;
 
 use crate::cli::Cli;
+use crate::config::Config;
+use crate::display_node::DisplayNode;
+use crate::node::FileTime;
 use crate::progress::RuntimeErrors;
 use clap::Parser;
 use dir_walker::WalkData;
@@ -298,32 +301,52 @@ fn main() {
     let print_errors = config.get_print_errors(&options);
     print_any_errors(print_errors, walk_data.errors);
 
-    if let Some(root_node) = tree {
-        if config.get_output_json(&options) {
-            OUTPUT_TYPE.with(|wrapped| {
-                wrapped.replace(output_format);
-            });
-            println!("{}", serde_json::to_string(&root_node).unwrap());
-        } else {
-            let idd = InitialDisplayData {
-                short_paths: !config.get_full_paths(&options),
-                is_reversed: !config.get_reverse(&options),
-                colors_on: is_colors,
-                by_filecount,
-                by_filetime,
-                is_screen_reader: config.get_screen_reader(&options),
-                output_format,
-                bars_on_right: config.get_bars_on_right(&options),
-            };
+    print_output(
+        config,
+        options,
+        tree,
+        walk_data.by_filecount,
+        by_filetime,
+        is_colors,
+        terminal_width,
+    )
+}
 
-            draw_it(
-                idd,
-                config.get_no_bars(&options),
-                terminal_width,
-                &root_node,
-                config.get_skip_total(&options),
-            )
-        }
+fn print_output(
+    config: Config,
+    options: Cli,
+    tree: DisplayNode,
+    by_filecount: bool,
+    by_filetime: Option<FileTime>,
+    is_colors: bool,
+    terminal_width: usize,
+) {
+    let output_format = config.get_output_format(&options);
+
+    if config.get_output_json(&options) {
+        OUTPUT_TYPE.with(|wrapped| {
+            wrapped.replace(output_format);
+        });
+        println!("{}", serde_json::to_string(&tree).unwrap());
+    } else {
+        let idd = InitialDisplayData {
+            short_paths: !config.get_full_paths(&options),
+            is_reversed: !config.get_reverse(&options),
+            colors_on: is_colors,
+            by_filecount,
+            by_filetime,
+            is_screen_reader: config.get_screen_reader(&options),
+            output_format,
+            bars_on_right: config.get_bars_on_right(&options),
+        };
+
+        draw_it(
+            idd,
+            &tree,
+            config.get_no_bars(&options),
+            terminal_width,
+            config.get_skip_total(&options),
+        )
     }
 }