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4 files changed, 522 insertions, 0 deletions

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..6bccad9
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+authors = ["David Peter <mail@david-peter.de>"]
+categories = ["command-line-utilities"]
+homepage = "https://github.com/sharkdp/dup"
+name = "dup"
+license = "MIT/Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/sharkdp/dup"
+version = "0.1.0"
+
+[dependencies]
+ignore = "0.4.3"
+num_cpus = "1.0"
+humansize = "1.1"
+
+[profile.release]
+lto = true
+codegen-units = 1
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..62fd088
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,75 @@
+extern crate humansize;
+extern crate ignore;
+extern crate num_cpus;
+
+use std::collections::HashSet;
+use std::os::unix::fs::MetadataExt;
+use std::sync::mpsc::channel;
+use std::thread;
+
+use humansize::{file_size_opts, FileSize};
+use ignore::WalkBuilder;
+
+fn main() {
+    let mut builder = WalkBuilder::new("./");
+    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_cpus::get());
+
+    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;
+            }
+        }
+        println!(
+            "{} ({} bytes)",
+            total.file_size(file_size_opts::DECIMAL).unwrap(),
+            total
+        );
+    });
+
+    walker.run(|| {
+        let tx = tx.clone();
+        Box::new(move |result| {
+            if let Ok(entry) = result {
+                let metadata = entry.metadata().unwrap();
+
+                // 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)).unwrap();
+            }
+
+            return ignore::WalkState::Continue;
+        })
+    });
+
+    drop(tx);
+    receiver_thread.join().unwrap();
+}