diff --git a/pttodoest/Cargo.lock b/pttodoest/Cargo.lock
index 5dd7dbb..4ace4f7 100755
--- a/pttodoest/Cargo.lock
+++ b/pttodoest/Cargo.lock
@@ -120,6 +120,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
+
 [[package]]
 name = "gethostname"
 version = "1.1.0"
@@ -230,6 +236,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_yaml",
+ "tempdir",
 ]
 
 [[package]]
@@ -241,6 +248,52 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
+dependencies = [
+ "fuchsia-cprng",
+ "libc",
+ "rand_core 0.3.1",
+ "rdrand",
+ "winapi",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
+dependencies = [
+ "rand_core 0.4.2",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
+
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
+dependencies = [
+ "rand_core 0.3.1",
+]
+
+[[package]]
+name = "remove_dir_all"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "rustix"
 version = "1.1.2"
@@ -333,6 +386,16 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempdir"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
+dependencies = [
+ "rand",
+ "remove_dir_all",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"
@@ -371,6 +434,28 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
diff --git a/pttodoest/Cargo.toml b/pttodoest/Cargo.toml
index 07bf195..9d21ef0 100755
--- a/pttodoest/Cargo.toml
+++ b/pttodoest/Cargo.toml
@@ -11,3 +11,4 @@ jsonptr = "0.7.1"
 serde = { version = "1.0.228", features = ["serde_derive"] }
 serde_json = "1.0.145"
 serde_yaml = "0.9.34"
+tempdir = "0.3.7"
diff --git a/pttodoest/src/main.rs b/pttodoest/src/main.rs
index 0ccbd57..5198289 100755
--- a/pttodoest/src/main.rs
+++ b/pttodoest/src/main.rs
@@ -6,7 +6,6 @@ use std::io::{BufRead, Read, Write};
 fn main() {
     let flags = Flags::new().expect("failed to flags");
     let files = flags.files().expect("failed to files");
-    assert!(files.files.len() > 0, "no files");
 
     if !flags.dry_run {
         for file in files.files.iter() {
@@ -82,16 +81,38 @@ impl Flags {
                     .filter(|x| x.is_ok())
                     .map(|x| x.unwrap())
                     .filter(|x| x.metadata().unwrap().is_file())
-                    // TODO filter out hidden files
                     .map(|x| x.path().display().to_string())
+                    .filter(|x| !x.contains("/."))
                     .collect()),
                 Err(msg) => Err(format!("failed to read {}: {}", self.path.clone(), msg)),
             },
         }?;
+        assert!(files.len() > 0, "no files");
         Ok(Files::new(&files))
     }
 }
 
+#[cfg(test)]
+mod test_flags {
+    use super::*;
+
+    #[test]
+    fn test_flags_files_unhidden_only() {
+        let d = tempdir::TempDir::new("").unwrap();
+        std::fs::File::create(d.path().join("plain")).unwrap();
+        std::fs::File::create(d.path().join(".hidden")).unwrap();
+
+        let flags = Flags {
+            path: d.path().to_str().unwrap().to_string(),
+            add: None,
+            edit: false,
+            dry_run: true,
+        };
+        let files = flags.files().expect("failed to files from dir");
+        assert_eq!(1, files.files.len());
+    }
+}
+
 #[derive(Debug, Clone)]
 struct Files {
     files: Vec<File>,
@@ -201,6 +222,16 @@ impl File {
     }
 }
 
+#[cfg(test)]
+mod test_file {
+    use super::*;
+
+    #[test]
+    fn test_file() {
+        assert!(false, "not impl");
+    }
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 struct Delta {
     ts: u64,
@@ -307,3 +338,13 @@ impl Events {
         }
     }
 }
+
+#[cfg(test)]
+mod test_events {
+    use super::*;
+
+    #[test]
+    fn test_events() {
+        assert!(false, "not impl");
+    }
+}