feat: better error messages

Provide "No such file or directory" error if file is not found.
Provide "Unknown Error" if other error found

Should reduce confusion from the generic other error

src/dir_walker.rs

@@ -1,9 +1,11 @@
 use std::fs;
 use std::sync::Arc;
+use std::sync::Mutex;
 
 use crate::node::Node;
 use crate::progress::Operation;
 use crate::progress::PAtomicInfo;
+use crate::progress::RuntimeErrors;
 use crate::progress::ORDERING;
 use crate::utils::is_filtered_out_due_to_invert_regex;
 use crate::utils::is_filtered_out_due_to_regex;
@@ -28,16 +30,17 @@ pub struct WalkData<'a> {
     pub ignore_hidden: bool,
     pub follow_links: bool,
     pub progress_data: Arc<PAtomicInfo>,
+    pub errors: Arc<Mutex<RuntimeErrors>>,
 }
 
-pub fn walk_it(dirs: HashSet<PathBuf>, walk_data: WalkData) -> Vec<Node> {
+pub fn walk_it(dirs: HashSet<PathBuf>, walk_data: &WalkData) -> Vec<Node> {
     let mut inodes = HashSet::new();
     let top_level_nodes: Vec<_> = dirs
         .into_iter()
         .filter_map(|d| {
             let prog_data = &walk_data.progress_data;
             prog_data.clear_state(&d);
-            let node = walk(d, &walk_data, 0)?;
+            let node = walk(d, walk_data, 0)?;
 
             prog_data.state.store(Operation::PREPARING, ORDERING);
 
@@ -126,55 +129,83 @@ fn ignore_file(entry: &DirEntry, walk_data: &WalkData) -> bool {
 
 fn walk(dir: PathBuf, walk_data: &WalkData, depth: usize) -> Option<Node> {
     let prog_data = &walk_data.progress_data;
-    let mut children = vec![];
+    let errors = &walk_data.errors;
 
-    if let Ok(entries) = fs::read_dir(&dir) {
-        children = entries
-            .into_iter()
-            .par_bridge()
-            .filter_map(|entry| {
-                if let Ok(ref entry) = entry {
-                    // uncommenting the below line gives simpler code but
-                    // rayon doesn't parallelize as well giving a 3X performance drop
-                    // hence we unravel the recursion a bit
+    let children = if dir.is_dir() {
+        let read_dir = fs::read_dir(&dir);
+        match read_dir {
+            Ok(entries) => {
+                entries
+                    .into_iter()
+                    .par_bridge()
+                    .filter_map(|entry| {
+                        if let Ok(ref entry) = entry {
+                            // uncommenting the below line gives simpler code but
+                            // rayon doesn't parallelize as well giving a 3X performance drop
+                            // hence we unravel the recursion a bit
 
-                    // return walk(entry.path(), walk_data, depth)
+                            // return walk(entry.path(), walk_data, depth)
 
-                    if !ignore_file(entry, walk_data) {
-                        if let Ok(data) = entry.file_type() {
-                            if data.is_dir() || (walk_data.follow_links && data.is_symlink()) {
-                                return walk(entry.path(), walk_data, depth + 1);
+                            if !ignore_file(entry, walk_data) {
+                                if let Ok(data) = entry.file_type() {
+                                    if data.is_dir()
+                                        || (walk_data.follow_links && data.is_symlink())
+                                    {
+                                        return walk(entry.path(), walk_data, depth + 1);
+                                    }
+
+                                    let node = build_node(
+                                        entry.path(),
+                                        vec![],
+                                        walk_data.filter_regex,
+                                        walk_data.invert_filter_regex,
+                                        walk_data.use_apparent_size,
+                                        data.is_symlink(),
+                                        data.is_file(),
+                                        walk_data.by_filecount,
+                                        depth,
+                                    );
+
+                                    prog_data.num_files.fetch_add(1, ORDERING);
+                                    if let Some(ref file) = node {
+                                        prog_data.total_file_size.fetch_add(file.size, ORDERING);
+                                    }
+
+                                    return node;
+                                }
                             }
-
-                            let node = build_node(
-                                entry.path(),
-                                vec![],
-                                walk_data.filter_regex,
-                                walk_data.invert_filter_regex,
-                                walk_data.use_apparent_size,
-                                data.is_symlink(),
-                                data.is_file(),
-                                walk_data.by_filecount,
-                                depth,
-                            );
-
-                            prog_data.num_files.fetch_add(1, ORDERING);
-                            if let Some(ref file) = node {
-                                prog_data.total_file_size.fetch_add(file.size, ORDERING);
-                            }
-
-                            return node;
+                        } else {
+                            let mut editable_error = errors.lock().unwrap();
+                            editable_error.no_permissions = true
                         }
+                        None
+                    })
+                    .collect()
+            }
+            Err(failed) => {
+                let mut editable_error = errors.lock().unwrap();
+                match failed.kind() {
+                    std::io::ErrorKind::PermissionDenied => {
+                        editable_error.no_permissions = true;
+                    }
+                    std::io::ErrorKind::NotFound => {
+                        editable_error.file_not_found.insert(failed.to_string());
+                    }
+                    _ => {
+                        editable_error.unknown_error.insert(failed.to_string());
                     }
-                } else {
-                    prog_data.no_permissions.store(true, ORDERING)
                 }
-                None
-            })
-            .collect();
-    } else if !dir.is_file() {
-        walk_data.progress_data.no_permissions.store(true, ORDERING)
-    }
+                vec![]
+            }
+        }
+    } else {
+        if !dir.is_file() {
+            let mut editable_error = errors.lock().unwrap();
+            let bad_file = dir.as_os_str().to_string_lossy().into();
+            editable_error.file_not_found.insert(bad_file);
+        }
+        vec![]
+    };
     build_node(
         dir,
         children,

src/main.rs

@@ -11,17 +11,19 @@ mod progress;
 mod utils;
 
 use crate::cli::build_cli;
+use crate::progress::RuntimeErrors;
 use clap::parser::ValuesRef;
 use dir_walker::WalkData;
 use display::InitialDisplayData;
 use filter::AggregateData;
 use progress::PIndicator;
-use progress::ORDERING;
 use regex::Error;
 use std::collections::HashSet;
 use std::fs::read_to_string;
 use std::panic;
 use std::process;
+use std::sync::Arc;
+use std::sync::Mutex;
 use sysinfo::{System, SystemExt};
 
 use self::display::draw_it;
@@ -195,11 +197,12 @@ fn main() {
         ignore_hidden,
         follow_links,
         progress_data: indicator.data.clone(),
+        errors: Arc::new(Mutex::new(RuntimeErrors::default())),
     };
     let stack_size = config.get_custom_stack_size(&options);
     init_rayon(&stack_size);
 
-    let top_level_nodes = walk_it(simplified_dirs, walk_data);
+    let top_level_nodes = walk_it(simplified_dirs, &walk_data);
 
     let tree = match summarize_file_types {
         true => get_all_file_types(&top_level_nodes, number_of_lines),
@@ -216,12 +219,32 @@ fn main() {
         }
     };
 
-    let failed_permissions = indicator.data.no_permissions.load(ORDERING);
-    indicator.stop();
     // Must have stopped indicator before we print to stderr
+    indicator.stop();
+
+    let final_errors = walk_data.errors.lock().unwrap();
+    let failed_permissions = final_errors.no_permissions;
+    if !final_errors.file_not_found.is_empty() {
+        let err = final_errors
+            .file_not_found
+            .iter()
+            .map(|a| a.as_ref())
+            .collect::<Vec<&str>>()
+            .join(", ");
+        eprintln!("No such file or directory: {}", err);
+    }
     if failed_permissions {
         eprintln!("Did not have permissions for all directories");
     }
+    if !final_errors.unknown_error.is_empty() {
+        let err = final_errors
+            .unknown_error
+            .iter()
+            .map(|a| a.as_ref())
+            .collect::<Vec<&str>>()
+            .join(", ");
+        eprintln!("Unknown Error: {}", err);
+    }
 
     if let Some(root_node) = tree {
         let idd = InitialDisplayData {

src/progress.rs

@@ -1,8 +1,9 @@
 use std::{
+    collections::HashSet,
     io::Write,
     path::Path,
     sync::{
-        atomic::{AtomicBool, AtomicU64, AtomicU8, AtomicUsize, Ordering},
+        atomic::{AtomicU64, AtomicU8, AtomicUsize, Ordering},
         mpsc::{self, RecvTimeoutError, Sender},
         Arc, RwLock,
     },
@@ -55,7 +56,6 @@ pub struct PAtomicInfo {
     pub total_file_size: AtomicU64,
     pub state: AtomicU8,
     pub current_path: ThreadStringWrapper,
-    pub no_permissions: AtomicBool,
 }
 
 impl PAtomicInfo {
@@ -68,6 +68,13 @@ impl PAtomicInfo {
     }
 }
 
+#[derive(Default)]
+pub struct RuntimeErrors {
+    pub no_permissions: bool,
+    pub file_not_found: HashSet<String>,
+    pub unknown_error: HashSet<String>,
+}
+
 /* -------------------------------------------------------------------------- */
 
 fn format_preparing_str(prog_char: char, data: &PAtomicInfo, is_iso: bool) -> String {

tests/test_flags.rs

@@ -92,7 +92,7 @@ pub fn test_with_bad_param() {
     let mut cmd = Command::cargo_bin("dust").unwrap();
     let result = cmd.arg("bad_place").unwrap();
     let stderr = str::from_utf8(&result.stderr).unwrap();
-    assert!(stderr.contains("Did not have permissions for all directories"));
+    assert!(stderr.contains("No such file or directory"));
 }
 
 #[test]