Add bbn-json

bbn-json/.gitignore

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+/target/

bbn-json/Cargo.toml

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+[package]
+name = "bbn-json"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.68"

bbn-json/src/main.rs

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+use std::{fs, path::PathBuf};
+
+fn list_paths() -> anyhow::Result<Vec<PathBuf>> {
+    let mut paths = vec![];
+    let read_dir =
+        fs::read_dir("/Users/bouzuya/ghq/github.com/bouzuya/tmp-kraken-test/bbn-data-20230119")?;
+    for root_dir_entry in read_dir {
+        let root_dir_entry = root_dir_entry?;
+        let year_path = root_dir_entry.path();
+        for year_dir_entry in fs::read_dir(year_path.as_path())? {
+            let year_dir_entry = year_dir_entry?;
+            let month_path = year_dir_entry.path();
+            for month_dir_entry in fs::read_dir(month_path.as_path())? {
+                let month_dir_entry = month_dir_entry?;
+                let date_path = month_dir_entry.path();
+                paths.push(date_path);
+            }
+        }
+    }
+    paths.sort();
+    Ok(paths)
+}
+
+fn main() -> anyhow::Result<()> {
+    let paths = list_paths()?;
+    for path in paths {
+        println!("{:?}", path);
+    }
+    Ok(())
+}