its manual testing but it is working

Cargo.lock

@@ -2,6 +2,100 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anstream"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2ab91ebe16eb252986481c5b62f6098f3b698a45e34b5b98200cf20dd2484a44"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7079075b41f533b8c61d2a4d073c4676e1f8b249ff94a393b0595db304e0dd87"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "317b9a89c1868f5ea6ff1d9539a69f45dffc21ce321ac1fd1160dfa48c8e2140"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ca11d4be1bab0c8bc8734a9aa7bf4ee8316d462a08c6ac5052f888fef5b494b"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0699d10d2f4d628a98ee7b57b289abbc98ff3bad977cb3152709d4bf2330628"
+dependencies = [
+ "anstyle",
+ "windows-sys",
+]
+
+[[package]]
+name = "clap"
+version = "4.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2275f18819641850fa26c89acc84d465c1bf91ce57bc2748b28c420473352f64"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07cdf1b148b25c1e1f7a42225e30a0d99a615cd4637eae7365548dd4529b95bc"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf9804afaaf59a91e75b022a30fb7229a7901f60c755489cc61c9b423b836442"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "702fc72eb24e5a1e48ce58027a675bc24edd52096d5397d4aea7c6dd9eca0bd1"
+
+[[package]]
+name = "colorchoice"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -14,6 +108,12 @@ version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
 
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
 [[package]]
 name = "indexmap"
 version = "2.1.0"
@@ -87,6 +187,12 @@ dependencies = [
  "unsafe-libyaml",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
 [[package]]
 name = "syn"
 version = "2.0.39"
@@ -102,6 +208,7 @@ dependencies = [
 name = "tsheet-cli"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "serde",
  "serde_yaml",
 ]
@@ -117,3 +224,75 @@ name = "unsafe-libyaml"
 version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f28467d3e1d3c6586d8f25fa243f544f5800fec42d97032474e17222c2b75cfa"
+
+[[package]]
+name = "utf8parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
+
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"

Cargo.toml

@@ -6,5 +6,6 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.4.8", features = ["derive"] }
 serde = { version = "1.0.193", features = ["derive"] }
 serde_yaml = "0.9.27"

src/main.rs

@@ -2,10 +2,66 @@ use serde::{Serialize, Deserialize};
 use std::io::{Read, Write};
 use std::fs::File;
 use std::time::{SystemTime, UNIX_EPOCH, Duration};
-use std::ops::Add;
+use std::ops::{Add, Sub};
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+struct Flags {
+   #[arg(short = 'f', long = "file")]
+   f: String,
+
+   #[arg(short = 'l', long = "log")]
+   log: bool,
+
+   #[arg(short = 's', long = "since")]
+   since: Option<String>,
+
+   #[arg(short = 'a', long = "add")]
+   add: Option<String>,
+
+   #[arg(short = 't', long = "tag")]
+   tag: Option<String>,
+}
 
 fn main() {
-    println!("Hello, world!");
+   let flags = Flags::parse();
+
+   add(&flags.f, &flags.add, &flags.tag).unwrap();
+   log(&flags.f, &flags.since).unwrap();
+
+   println!("{:?}", flags);
+}
+
+fn add(f: &String, x: &Option<String>, tag: &Option<String>) -> Result<(), String> {
+   match x {
+      Some(x) => {
+         let mut tsheet = load(&f)?;
+         tsheet.add(
+            x.to_string(),
+            tag.clone().unwrap_or("".to_string()),
+         );
+         save(&f, tsheet)?;
+      },
+      None => {},
+   };
+   Ok(())
+}
+
+fn log(f: &String, since: &Option<String>) -> Result<(), String> {
+   let since = parse_time(since)?;
+   let tsheet = load(&f)?;
+   let tsheet = tsheet.since(since);
+   println!("{:?}", tsheet);
+   Err("not impl".to_string())
+}
+
+fn parse_time(since: &Option<String>) -> Result<SystemTime, String> {
+   match since {
+      Some(since) => {
+         Err("not impl".to_string())
+      },
+      None => Ok(SystemTime::now().sub(Duration::from_secs(60*60*24*7))),
+   }
 }
 
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
@@ -20,7 +76,7 @@ struct X {
    tag: String,
 }
 
-fn save(path: String, tsheet: TSheet) -> Result<(), String> {
+fn save(path: &String, tsheet: TSheet) -> Result<(), String> {
    match File::create(path.clone()) {
       Ok(mut writer) => _save(&mut writer, tsheet),
       Err(reason) => Err(format!("failed to open {} to save tsheet: {}", path, reason)),
@@ -35,7 +91,7 @@ fn _save(writer: &mut dyn Write, tsheet: TSheet) -> Result<(), String> {
    }
 }
 
-fn load(path: String) -> Result<TSheet, String> {
+fn load(path: &String) -> Result<TSheet, String> {
    match File::open(path.clone()) {
       Ok(mut reader) => _load(&mut reader),
       Err(reason) => Err(format!("failed to read tsheet {}: {}", path, reason)),