Impl. custom parallel directory walker using rayon

4 files changed, 131 insertions, 370 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 938c491..90409f0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,12 +1,4 @@
 [[package]]
-name = "aho-corasick"
-version = "0.6.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "ansi_term"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -58,83 +50,50 @@ dependencies = [
 ]
 
 [[package]]
-name = "cloudabi"
-version = "0.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "crossbeam-channel"
-version = "0.2.6"
+name = "crossbeam-deque"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-epoch 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.6.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.5.0"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "diskus"
-version = "0.3.0"
+version = "0.3.1"
 dependencies = [
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "humansize 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ignore 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "fnv"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "fuchsia-zircon"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "fuchsia-zircon-sys"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "globset"
-version = "0.4.2"
+name = "either"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
 
 [[package]]
 name = "humansize"
@@ -142,23 +101,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "ignore"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "crossbeam-channel 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "globset 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "walkdir 2.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "kernel32-sys"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -181,33 +123,6 @@ version = "0.2.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "lock_api"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "log"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "memchr"
-version = "2.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
 name = "memoffset"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -226,60 +141,27 @@ dependencies = [
 ]
 
 [[package]]
-name = "owning_ref"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "parking_lot"
-version = "0.6.4"
+name = "rayon"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lock_api 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "parking_lot_core"
-version = "0.3.1"
+name = "rayon-core"
+version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
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- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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-
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- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
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- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
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-
-[[package]]
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-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
-name = "rand_core"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
 name = "redox_syscall"
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@@ -293,73 +175,11 @@ dependencies = [
 ]
 
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-name = "regex"
-version = "1.0.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
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- "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
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-
-[[package]]
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-version = "0.6.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
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-
-[[package]]
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 version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "semver"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
-[[package]]
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-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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@@ -394,37 +214,11 @@ dependencies = [
 ]
 
 [[package]]
-name = "thread_local"
-version = "0.3.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
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-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
-
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-
-[[package]]
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@@ -435,21 +229,6 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
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-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
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-
-[[package]]
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@@ -474,78 +253,42 @@ version = "0.4.0"
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diff --git a/Cargo.toml b/Cargo.toml
index 4fb2476..49a349c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,9 +10,9 @@ repository = "https://github.com/sharkdp/diskus"
 version = "0.3.1"
 
 [dependencies]
-ignore = "0.4.3"
 num_cpus = "1.0"
 humansize = "1.1"
+rayon = "1.0"
 
 [dependencies.clap]
 version = "2"
@@ -20,4 +20,4 @@ features = ["suggestions", "color", "wrap_help"]
 
 [profile.release]
 lto = true
-codegen-units = 1
+aodegen-units = 1
diff --git a/src/main.rs b/src/main.rs
index 00ac301..20b1333 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,89 +1,17 @@
-extern crate humansize;
-extern crate ignore;
-extern crate num_cpus;
 #[macro_use]
 extern crate clap;
+extern crate humansize;
+extern crate num_cpus;
+extern crate rayon;
 
-use std::collections::HashSet;
-use std::os::unix::fs::MetadataExt;
-use std::path::Path;
-use std::sync::mpsc::channel;
-use std::thread;
+mod walk;
+
+use std::path::PathBuf;
 
 use clap::{App, AppSettings, Arg};
 use humansize::{file_size_opts, FileSize};
-use ignore::WalkBuilder;
-
-fn get_size<P: AsRef<Path>>(p: P, num_threads: usize) -> u64 {
-    let mut builder = WalkBuilder::new(p);
-    builder.hidden(false);
-    builder.parents(false);
-    builder.ignore(false);
-    builder.git_global(false);
-    builder.git_ignore(false);
-    builder.git_exclude(false);
-    builder.follow_links(false);
-
-    builder.threads(num_threads);
-
-    let walker = builder.build_parallel();
 
-    let (tx, rx) = channel();
-
-    let receiver_thread = thread::spawn(move || {
-        let mut total = 0;
-        let mut ids = HashSet::new();
-        for (unique_id, size) in rx {
-            if let Some(unique_id) = unique_id {
-                // Only count this entry if the ID has not been seen
-                if ids.insert(unique_id) {
-                    total += size;
-                }
-            } else {
-                total += size;
-            }
-        }
-
-        total
-    });
-
-    walker.run(|| {
-        let tx = tx.clone();
-        Box::new(move |result| {
-            match result {
-                Ok(entry) => {
-                    if let Ok(metadata) = entry.metadata() {
-                        // If the entry has more than one hard link, generate
-                        // a unique ID consisting of device and inode in order
-                        // not to count this entry twice.
-                        let unique_id = if metadata.is_file() && metadata.nlink() > 1 {
-                            Some((metadata.dev(), metadata.ino()))
-                        } else {
-                            None
-                        };
-
-                        let size = metadata.len();
-
-                        tx.send((unique_id, size)).ok();
-                    } else {
-                        eprintln!(
-                            "Could not get metadata: '{}'",
-                            entry.path().to_string_lossy()
-                        );
-                    }
-                }
-                Err(err) => {
-                    eprintln!("I/O error: {}", err);
-                }
-            }
-
-            return ignore::WalkState::Continue;
-        })
-    });
-
-    drop(tx);
-    receiver_thread.join().unwrap()
-}
+use walk::Walk;
 
 fn print_result(size: u64) {
     println!(
@@ -122,6 +50,8 @@ fn main() {
         .and_then(|t| t.parse().ok())
         .unwrap_or(3 * num_cpus::get());
 
-    let size = get_size(".", num_threads);
+    let paths = &[PathBuf::from(".")];
+    let walk = Walk::new(paths, num_threads);
+    let size = walk.run();
     print_result(size);
 }
diff --git a/src/walk.rs b/src/walk.rs
new file mode 100644
index 0000000..cbf0656
--- /dev/null
+++ b/src/walk.rs
@@ -0,0 +1,88 @@
+use std::collections::HashSet;
+use std::fs;
+use std::os::unix::fs::MetadataExt;
+use std::path::PathBuf;
+use std::sync::mpsc::{channel, Sender};
+use std::thread;
+
+use rayon::prelude::*;
+
+type UniqueID = (u64, u64);
+
+type SizeEntry = (Option<UniqueID>, u64);
+
+fn walk(tx: Sender<SizeEntry>, entries: &[PathBuf]) {
+    entries.par_iter().for_each_with(tx, |tx_ref, entry| {
+        if let Ok(metadata) = entry.metadata() {
+            // If the entry has more than one hard link, generate
+            // a unique ID consisting of device and inode in order
+            // not to count this entry twice.
+            let unique_id = if metadata.is_file() && metadata.nlink() > 1 {
+                Some((metadata.dev(), metadata.ino()))
+            } else {
+                None
+            };
+
+            let size = metadata.len();
+
+            tx_ref.send((unique_id, size)).unwrap();
+        } else {
+            eprintln!("Could not get metadata: '{}'", entry.to_string_lossy());
+        };
+
+        if entry.is_dir() {
+            let mut children = vec![];
+            for child_entry in fs::read_dir(entry).unwrap() {
+                if let Ok(child_entry) = child_entry {
+                    let path = child_entry.path();
+                    children.push(PathBuf::from(path));
+                }
+            }
+
+            walk(tx_ref.clone(), &children[..]);
+        };
+    });
+}
+
+pub struct Walk<'a> {
+    root_directories: &'a [PathBuf],
+    threads: usize,
+}
+
+impl<'a> Walk<'a> {
+    pub fn new(root_directories: &'a [PathBuf], threads: usize) -> Walk {
+        Walk {
+            root_directories,
+            threads,
+        }
+    }
+
+    pub fn run(&self) -> u64 {
+        let (tx, rx) = channel();
+
+        let receiver_thread = thread::spawn(move || {
+            let mut total = 0;
+            let mut ids = HashSet::new();
+            for (unique_id, size) in rx {
+                if let Some(unique_id) = unique_id {
+                    // Only count this entry if the ID has not been seen
+                    if ids.insert(unique_id) {
+                        total += size;
+                    }
+                } else {
+                    total += size;
+                }
+            }
+
+            total
+        });
+
+        let pool = rayon::ThreadPoolBuilder::new()
+            .num_threads(self.threads)
+            .build()
+            .unwrap();
+        pool.install(|| walk(tx, self.root_directories));
+
+        receiver_thread.join().unwrap()
+    }
+}