Add watch mode, and don't panic on clean failure

Cargo.toml

@@ -8,3 +8,4 @@ clap = "2.32.0"
 indicatif = "0.9.0"
 console = "0.6.2"
 syntect = "3.0.2"
+notify = "4.0.0"

src/main.rs

@@ -3,6 +3,7 @@ extern crate clap;
 extern crate console;
 extern crate indicatif;
 extern crate syntect;
+extern crate notify;
 
 use clap::{App, Arg, SubCommand};
 use console::{style, Emoji};
@@ -14,6 +15,11 @@ use syntect::util::{as_24_bit_terminal_escaped, LinesWithEndings};
 use std::fs::remove_file;
 use std::io::BufRead;
 use std::process::Command;
+use std::fs::read_to_string;
+use std::sync::mpsc::channel;
+use std::time::Duration;
+use notify::DebouncedEvent;
+use notify::{RecommendedWatcher, Watcher, RecursiveMode};
 
 fn main() {
     let matches = App::new("rustlings")
@@ -21,6 +27,7 @@ fn main() {
         .author("Olivia Hugger")
         .about("Test")
         .subcommand(SubCommand::with_name("verify").alias("v"))
+        .subcommand(SubCommand::with_name("watch").alias("w"))
         .subcommand(
             SubCommand::with_name("run")
                 .alias("r")
@@ -57,7 +64,7 @@ fn main() {
                     let formatstr =
                         format!("{} Successfully ran {}", Emoji("✅", "✓"), filename);
                     println!("{}", style(formatstr).green());
-                    clean().unwrap();
+                    clean();
                 } else {
                     println!("{}", String::from_utf8_lossy(&runcmd.stdout));
                     println!("{}", String::from_utf8_lossy(&runcmd.stderr));
@@ -65,7 +72,7 @@ fn main() {
                     let formatstr =
                         format!("{} Ran {} with errors", Emoji("⚠️ ", "!"), filename);
                     println!("{}", style(formatstr).red());
-                    clean().unwrap();
+                    clean();
                 }
             } else {
                 bar.finish_and_clear();
@@ -76,7 +83,7 @@ fn main() {
                 );
                 println!("{}", style(formatstr).red());
                 println!("{}", String::from_utf8_lossy(&compilecmd.stderr));
-                clean().unwrap();
+                clean();
             }
         } else {
             panic!("Please supply a filename!");
@@ -84,60 +91,14 @@ fn main() {
     }
 
     if let Some(_) = matches.subcommand_matches("verify") {
-        compile_only("exercises/ex1.rs");
+        match verify() {
-        compile_only("exercises/ex2.rs");
+            Ok(_) => {}
-        compile_only("exercises/ex3.rs");
+            Err(_) => std::process::exit(1),
-        compile_only("exercises/ex4.rs");
+        }
-        compile_only("exercises/ex5.rs");
+    }
 
-        compile_only("exercises/variables/variables1.rs");
+    if let Some(_) = matches.subcommand_matches("watch") {
-        compile_only("exercises/variables/variables2.rs");
+        watch().unwrap();
-        compile_only("exercises/variables/variables3.rs");
-        compile_only("exercises/variables/variables4.rs");
-
-        compile_only("exercises/functions/functions1.rs");
-        compile_only("exercises/functions/functions2.rs");
-        compile_only("exercises/functions/functions3.rs");
-        compile_only("exercises/functions/functions4.rs");
-        compile_only("exercises/functions/functions5.rs");
-
-        compile_only("exercises/primitive_types/primitive_types1.rs");
-        compile_only("exercises/primitive_types/primitive_types2.rs");
-        compile_only("exercises/primitive_types/primitive_types3.rs");
-        compile_only("exercises/primitive_types/primitive_types4.rs");
-        compile_only("exercises/primitive_types/primitive_types5.rs");
-        compile_only("exercises/primitive_types/primitive_types6.rs");
-
-        test("exercises/tests/tests1.rs");
-        test("exercises/tests/tests2.rs");
-        test("exercises/tests/tests3.rs");
-        test("exercises/tests/tests4.rs");
-
-        test("exercises/if/if1.rs");
-
-        compile_only("exercises/strings/strings1.rs");
-        compile_only("exercises/strings/strings2.rs");
-        compile_only("exercises/strings/strings3.rs");
-
-        compile_only("exercises/move_semantics/move_semantics1.rs");
-        compile_only("exercises/move_semantics/move_semantics2.rs");
-        compile_only("exercises/move_semantics/move_semantics3.rs");
-        compile_only("exercises/move_semantics/move_semantics4.rs");
-
-        compile_only("exercises/modules/modules1.rs");
-        compile_only("exercises/modules/modules2.rs");
-
-        compile_only("exercises/macros/macros1.rs");
-        compile_only("exercises/macros/macros2.rs");
-        compile_only("exercises/macros/macros3.rs");
-        compile_only("exercises/macros/macros4.rs");
-
-        test("exercises/error_handling/errors1.rs");
-        test("exercises/error_handling/errors2.rs");
-        test("exercises/error_handling/errors3.rs");
-        test("exercises/error_handling/errorsn.rs");
-        compile_only("exercises/error_handling/option1.rs");
-        test("exercises/error_handling/result1.rs");
     }
 
     if let None = matches.subcommand_name() {
@@ -152,7 +113,79 @@ fn main() {
     println!("\x1b[0m");
 }
 
-fn compile_only(filename: &str) {
+fn watch() -> notify::Result<()> {
+    let (tx, rx) = channel();
+
+    let mut watcher: RecommendedWatcher = Watcher::new(tx, Duration::from_secs(2))?;
+    watcher.watch("./exercises", RecursiveMode::Recursive)?;
+
+    let _ignored = verify();
+
+    loop {
+        match rx.recv() {
+            Ok(event) => {
+                match event {
+                    DebouncedEvent::Chmod(_)
+                    | DebouncedEvent::Write(_) => {
+                        let _ignored = verify();
+                    }
+                    _ => {}
+                }
+            },
+            Err(e) => println!("watch error: {:?}", e),
+        }
+    }
+}
+
+fn verify() -> Result<(), ()> {
+    compile_only("exercises/ex1.rs")?;
+    compile_only("exercises/ex2.rs")?;
+    compile_only("exercises/ex3.rs")?;
+    compile_only("exercises/ex4.rs")?;
+    compile_only("exercises/ex5.rs")?;
+    compile_only("exercises/variables/variables1.rs")?;
+    compile_only("exercises/variables/variables2.rs")?;
+    compile_only("exercises/variables/variables3.rs")?;
+    compile_only("exercises/variables/variables4.rs")?;
+    compile_only("exercises/functions/functions1.rs")?;
+    compile_only("exercises/functions/functions2.rs")?;
+    compile_only("exercises/functions/functions3.rs")?;
+    compile_only("exercises/functions/functions4.rs")?;
+    compile_only("exercises/functions/functions5.rs")?;
+    compile_only("exercises/primitive_types/primitive_types1.rs")?;
+    compile_only("exercises/primitive_types/primitive_types2.rs")?;
+    compile_only("exercises/primitive_types/primitive_types3.rs")?;
+    compile_only("exercises/primitive_types/primitive_types4.rs")?;
+    compile_only("exercises/primitive_types/primitive_types5.rs")?;
+    compile_only("exercises/primitive_types/primitive_types6.rs")?;
+    test("exercises/tests/tests1.rs")?;
+    test("exercises/tests/tests2.rs")?;
+    test("exercises/tests/tests3.rs")?;
+    test("exercises/tests/tests4.rs")?;
+    test("exercises/if/if1.rs")?;
+    compile_only("exercises/strings/strings1.rs")?;
+    compile_only("exercises/strings/strings2.rs")?;
+    compile_only("exercises/strings/strings3.rs")?;
+    compile_only("exercises/move_semantics/move_semantics1.rs")?;
+    compile_only("exercises/move_semantics/move_semantics2.rs")?;
+    compile_only("exercises/move_semantics/move_semantics3.rs")?;
+    compile_only("exercises/move_semantics/move_semantics4.rs")?;
+    compile_only("exercises/modules/modules1.rs")?;
+    compile_only("exercises/modules/modules2.rs")?;
+    compile_only("exercises/macros/macros1.rs")?;
+    compile_only("exercises/macros/macros2.rs")?;
+    compile_only("exercises/macros/macros3.rs")?;
+    compile_only("exercises/macros/macros4.rs")?;
+    test("exercises/error_handling/errors1.rs")?;
+    test("exercises/error_handling/errors2.rs")?;
+    test("exercises/error_handling/errors3.rs")?;
+    test("exercises/error_handling/errorsn.rs")?;
+    compile_only("exercises/error_handling/option1.rs")?;
+    test("exercises/error_handling/result1.rs")?;
+    Ok(())
+}
+
+fn compile_only(filename: &str) -> Result<(), ()> {
     let bar = ProgressBar::new_spinner();
     bar.set_message(format!("Compiling {}...", filename).as_str());
     bar.enable_steady_tick(100);
@@ -168,7 +201,8 @@ fn compile_only(filename: &str) {
             filename
         );
         println!("{}", style(formatstr).green());
-        clean().unwrap();
+        clean();
+        Ok(())
     } else {
         let formatstr = format!(
             "{} Compilation of {} failed! Compiler error message:\n",
@@ -177,12 +211,12 @@ fn compile_only(filename: &str) {
         );
         println!("{}", style(formatstr).red());
         println!("{}", String::from_utf8_lossy(&compilecmd.stderr));
-        clean().unwrap();
+        clean();
-        std::process::exit(1);
+        Err(())
     }
 }
 
-fn test(filename: &str) {
+fn test(filename: &str) -> Result<(), ()> {
     let bar = ProgressBar::new_spinner();
     bar.set_message(format!("Testing {}...", filename).as_str());
     bar.enable_steady_tick(100);
@@ -194,7 +228,8 @@ fn test(filename: &str) {
     if testcmd.status.success() {
         let formatstr = format!("{} Successfully tested {}!", Emoji("✅", "✓"), filename);
         println!("{}", style(formatstr).green());
-        clean().unwrap();
+        clean();
+        Ok(())
     } else {
         let formatstr = format!(
             "{} Testing of {} failed! Please try again.",
@@ -202,12 +237,11 @@ fn test(filename: &str) {
             filename
         );
         println!("{}", style(formatstr).red());
-        clean().unwrap();
+        clean();
-        std::process::exit(1);
+        Err(())
     }
 }
 
-fn clean() -> Result<(), std::io::Error> {
+fn clean() {
-    remove_file("temp")?;
+    let _ignored = remove_file("temp");
-    Ok(())
 }