Ask user’s consent before executing a command

src/command.rs

@@ -3,6 +3,7 @@ use enumset::EnumSetType;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::fmt;
+use std::io::{stdout, Write};
 use std::path::PathBuf;
 use std::process::Command;
 
@@ -55,7 +56,6 @@ impl Updater {
     /// To create a sample config from code
     #[doc(hidden)]
     fn write_config(&self, opt: &Opt) {
-        use ::std::io::Write;
         use std::fs::OpenOptions;
 
         let mut f = OpenOptions::new()
@@ -157,13 +157,24 @@ impl Cmd {
             cmd.current_dir(std::fs::canonicalize(cdir).unwrap());
         }
 
-        println!("Executing {}", self);
-        // TODO: Ask if ok or
+        let confirm = "[Y/n]? ";
+
+        print!("Will execute {}{}", self, confirm);
+        stdout().flush().unwrap();
+
+        let mut yes_no = String::new();
+        std::io::stdin()
+            .read_line(&mut yes_no)
+            .expect("Unable to read user’s input");
+
+        if !yes_no.to_lowercase().starts_with('n') {
             if cmd.status().unwrap().success() {
-            println!("Youpi !");
+                eprintln!("Youpi !");
                 // Other checks?
+            } else {
+                eprintln!("Error executing the command")
+            }
         }
-        println!("Exécutée");
 
         Ok(())
     }
@@ -171,20 +182,22 @@ impl Cmd {
 
 impl fmt::Display for Cmd {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let command = if self.params.is_empty() {
-            self.exe.clone()
-        } else {
+        let command = if !self.params.is_empty() {
             format!("{} {}", &self.exe, &self.params.join(" "))
+        } else {
+            self.exe.clone()
         };
         write!(f, "`{}`", command)?;
+
         if let Some(cdir) = &self.current_dir {
             write!(f, " in {:?}", cdir)?;
         }
+
         if !self.env.is_empty() {
             writeln!(f, " with the following environment variable:")?;
             writeln!(f, "{:?}", self.env)
         } else {
-            writeln!(f, " without any environment variable.")
+            write!(f, " without any environment variable. ")
         }
     }
 }