feat: Replace emojis when NO_EMOJI env variable present

src/exercise.rs

@@ -1,3 +1,4 @@
+use std::env;
 use regex::Regex;
 use serde::Deserialize;
 use std::fmt::{self, Display, Formatter};
@@ -126,8 +127,12 @@ name = "{}"
 path = "{}.rs""#,
                     self.name, self.name, self.name
                 );
+                let cargo_toml_error_msg = match env::var("NO_EMOJI").is_ok() {
+                    true => "Failed to write Clippy Cargo.toml file.",
+                    false => "Failed to write 📎 Clippy 📎 Cargo.toml file."
+                };
                 fs::write(CLIPPY_CARGO_TOML_PATH, cargo_toml)
-                    .expect("Failed to write 📎 Clippy 📎 Cargo.toml file.");
+                    .expect(cargo_toml_error_msg);
                 // To support the ability to run the clipy exercises, build
                 // an executable, in addition to running clippy. With a
                 // compilation failure, this would silently fail. But we expect

src/ui.rs

@@ -1,23 +1,47 @@
 macro_rules! warn {
     ($fmt:literal, $ex:expr) => {{
+        use std::env;
         use console::{style, Emoji};
         let formatstr = format!($fmt, $ex);
-        println!(
+        match env::var("NO_EMOJI").is_ok() {
-            "{} {}",
+            true => {
-            style(Emoji("⚠️ ", "!")).red(),
+                println!(
-            style(formatstr).red()
+                    "{} {}",
-        );
+                    style("!").red(),
+                    style(formatstr).red()
+                );
+            },
+            false => {
+                println!(
+                    "{} {}",
+                    style(Emoji("⚠️ ", "!")).red(),
+                    style(formatstr).red()
+                );
+            }
+        }
     }};
 }
 
 macro_rules! success {
     ($fmt:literal, $ex:expr) => {{
+        use std::env;
         use console::{style, Emoji};
         let formatstr = format!($fmt, $ex);
-        println!(
+        match env::var("NO_EMOJI").is_ok() {
-            "{} {}",
+            true => {
-            style(Emoji("✅", "✓")).green(),
+                println!(
-            style(formatstr).green()
+                    "{} {}",
-        );
+                    style("✓").green(),
+                    style(formatstr).green()
+                );
+            },
+            false => {
+                println!(
+                    "{} {}",
+                    style(Emoji("✅", "✓")).green(),
+                    style(formatstr).green()
+                );
+            }
+        }
     }};
 }

src/verify.rs

@@ -1,3 +1,4 @@
+use std::env;
 use crate::exercise::{CompiledExercise, Exercise, Mode, State};
 use console::style;
 use indicatif::ProgressBar;
@@ -137,14 +138,24 @@ fn prompt_for_completion(exercise: &Exercise, prompt_output: Option<String>) ->
         State::Pending(context) => context,
     };
 
+    let no_emoji = env::var("NO_EMOJI").is_ok();
+
+    let clippy_success_msg = match no_emoji {
+        true => "The code is compiling, and Clippy is happy!",
+        false => "The code is compiling, and 📎 Clippy 📎 is happy!"
+    };
+
     let success_msg = match exercise.mode {
         Mode::Compile => "The code is compiling!",
         Mode::Test => "The code is compiling, and the tests pass!",
-        Mode::Clippy => "The code is compiling, and 📎 Clippy 📎 is happy!",
+        Mode::Clippy => clippy_success_msg,
     };
 
     println!();
-    println!("🎉 🎉  {} 🎉 🎉", success_msg);
+    match no_emoji {
+        true => println!("~*~ {} ~*~", success_msg),
+        false => println!("🎉 🎉  {} 🎉 🎉", success_msg)
+    };
     println!();
 
     if let Some(output) = prompt_output {