add prompt

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "simple-std"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2018"
 description = "A simple extension to the Rust standard library for exercises"
 keywords = ["beginner", "help"]

README.md

@@ -4,7 +4,7 @@ really, don't.
 
 ```toml
 [dependencies]
-simple-std = "0.1.0"
+simple-std = "0.1.1"
 ```
 
 simple-std is a little extension to the standard library, 
@@ -33,12 +33,12 @@ fn main() {
 Guessing game
 
 ```rust
-use simple_std::{input, random_int_range}; 
+use simple_std::{prompt, random_int_range}; 
 
 fn main() {
     let number = random_int_range(0..100);
     loop {
-        let input = input().parse::<i32>().expect("not a number");
+        let input = prompt("Guess: ").parse::<i32>().expect("not a number");
         if input < number {
             println!("Higher");
         } else if input > number {

src/lib.rs

@@ -1,16 +1,15 @@
 //!
 //! # Example: guessing game
 //! ```
-//! use simple_std::{input, random_int_range};
+//! use simple_std::{prompt, random_int_range};
 //!
-//! fn main() {
 //! let number = random_int_range(0..100);
 //! loop {
 //!#    // hack the input function for this to work in the doc test    
-//!#        fn input() -> String {
+//!#    fn prompt(_str: &str) -> String {
 //!#         random_int_range(0..100).to_string()
 //!#    }
-//!         let input = input().parse::<i32>().expect("not a number");
+//!     let input = prompt("guess: ").parse::<i32>().expect("not a number");
 //!     if input < number {
 //!         println!("Higher");
 //!     } else if input > number {
@@ -20,10 +19,9 @@
 //!         break;
 //!     }
 //! }
-//! }
 //! ```
 
-pub use io::input;
+pub use io::{input, prompt};
 pub use random::{random_float, random_int_range};
 
 mod io {
@@ -48,6 +46,28 @@ mod io {
         std::io::stdin().read_line(&mut buffer).unwrap();
         buffer
     }
+
+    ///
+    /// Reads a single line of input, while providing a message that comes on the same line.
+    ///
+    /// # Example
+    /// ```
+    /// use simple_std::prompt;
+    ///
+    /// let name = prompt("Your name: ");
+    /// println!("Hello {}!", name)
+    /// ```
+    ///
+    /// # Why is this not in std?
+    ///
+    /// see [`input`]
+    pub fn prompt(message: &str) -> String {
+        use std::io::Write;
+
+        print!("{}", message);
+        std::io::stdout().flush().unwrap();
+        input()
+    }
 }
 
 mod random {