Added Error message when nothing staged.

Cargo.toml

@@ -20,6 +20,7 @@ serde_json = "1.0.79"
 clap = { version = "3.1.6", features = ["derive"] }
 dirs = "4.0.0"
 anyhow = "1.0.56"
+colored = "2.0.0"
 
 [dev-dependencies]
 assert_fs = "1.0.7"

src/main.rs

@@ -11,11 +11,13 @@ mod commit;
 mod commit_message;
 mod config;
 
+use anyhow::anyhow;
 use anyhow::Result;
 use clap::Parser;
+use colored::Colorize;
 use std::io::Write;
-
 use std::path::PathBuf;
+use std::process::Command;
 
 use commit_message::make_message_commit;
 
@@ -44,6 +46,19 @@ fn main() -> Result<()> {
         std::env::set_current_dir(current_dir)?;
     }
 
+    if let Some(0) = Command::new("git")
+        .args(["diff", "--cached", "--quiet"])
+        .output()
+        .expect("failed to execute process")
+        .status
+        .code()
+    {
+        return Err(anyhow!(
+            "{}",
+            "You have not added anything please do `git add`".red()
+        ));
+    }
+
     let opt = Opt::parse();
     if opt.init {
         let mut file = std::fs::File::create("commit.json")?;