feat: implement Summain in Rust

2 files changed, 69 insertions, 2 deletions

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1 @@
+
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..fd23eb8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,69 @@
-fn main() {
-    println!("Hello, world!");
+use anyhow::Context;
+use serde::Serialize;
+use std::fs::symlink_metadata;
+use std::fs::Metadata;
+use std::os::linux::fs::MetadataExt;
+use std::path::{Path, PathBuf};
+use structopt::StructOpt;
+
+fn main() -> anyhow::Result<()> {
+    let mut opt = Opt::from_args();
+    opt.pathnames[..].sort();
+    for pathname in opt.pathnames {
+        report(&pathname).with_context(|| format!("{}", pathname.display()))?
+    }
+    Ok(())
+}
+
+#[derive(StructOpt, Debug)]
+struct Opt {
+    #[structopt(parse(from_os_str))]
+    pathnames: Vec<PathBuf>,
+}
+
+#[derive(Serialize, Debug)]
+struct Entry {
+    path: PathBuf,
+    atime: i64,
+    atime_nsec: i64,
+    #[serde(with = "mode")]
+    mode: u32,
+    mtime: i64,
+    mtime_nsec: i64,
+    nlink: u64,
+    size: Option<u64>,
+}
+
+impl Entry {
+    fn new(path: &Path, m: Metadata) -> Self {
+        Self {
+            path: path.to_path_buf(),
+            atime: m.st_atime(),
+            atime_nsec: m.st_atime_nsec(),
+            mode: m.st_mode(),
+            mtime: m.st_mtime(),
+            mtime_nsec: m.st_mtime_nsec(),
+            nlink: m.st_nlink(),
+            size: if m.is_dir() { None } else { Some(m.st_size()) },
+        }
+    }
+}
+
+fn report(pathname: &Path) -> anyhow::Result<()> {
+    let m = symlink_metadata(pathname)?;
+    let e = Entry::new(pathname, m);
+    println!("{}", serde_yaml::to_string(&e)?);
+    Ok(())
+}
+
+mod mode {
+    use serde::{self, Serializer};
+
+    pub fn serialize<S>(mode: &u32, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let s = unix_mode::to_string(*mode);
+        serializer.serialize_str(&s)
+    }
 }