Scaffolding of main, library, and tests

5 files changed, 61 insertions, 19 deletions

diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 7d75412..be173f5 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -4,3 +4,11 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+
+[lib]
+name = "lambda"
+path = "src/lambda.rs"
+
+[[bin]]
+name = "lambda"
+path = "src/main.rs"
diff --git a/rust/sample/test.txt b/rust/sample/test.txt
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/rust/sample/test.txt
@@ -0,0 +1 @@
+1
diff --git a/rust/src/lambda.rs b/rust/src/lambda.rs
new file mode 100644
index 0000000..a24b031
--- /dev/null
+++ b/rust/src/lambda.rs
@@ -0,0 +1,40 @@
+use std::{
+    fmt::{self, Display},
+    fs::read_to_string,
+};
+
+pub fn run(arg: &str) -> String {
+    let content = read_to_string(arg).unwrap();
+    let result = interpret(&content.to_string());
+
+    result.to_string()
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Value {
+    Num(i32),
+}
+
+impl Display for Value {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Value::Num(i) => write!(f, "{}", i),
+        }
+    }
+}
+
+fn interpret(_arg: &str) -> Value {
+    Value::Num(1)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::interpret;
+    use super::Value::Num;
+
+    #[test]
+    fn it_works() {
+        let result = interpret("1");
+        assert_eq!(Num(1), result);
+    }
+}
diff --git a/rust/src/main.rs b/rust/src/main.rs
index e18788e..b6cc9bf 100644
--- a/rust/src/main.rs
+++ b/rust/src/main.rs
@@ -1,23 +1,9 @@
-fn main() {
-    println!("Hello, world!");
-}
-
-#[derive(Debug, PartialEq)]
-pub enum Value {
-    Num(i32),
-}
+use std::env::args;
 
-pub fn interpret(arg: &str) -> Value {
-    Value::Num(1)
-}
+use lambda::run;
 
-#[cfg(test)]
-mod tests {
-    use crate::{interpret, Value::Num};
+mod lambda;
 
-    #[test]
-    fn it_works() {
-        let result = interpret("1");
-        assert_eq!(Num(1), result);
-    }
+fn main() {
+    run(&args().nth(1).unwrap());
 }
diff --git a/rust/tests/interpret_test.rs b/rust/tests/interpret_test.rs
new file mode 100644
index 0000000..f0b5201
--- /dev/null
+++ b/rust/tests/interpret_test.rs
@@ -0,0 +1,7 @@
+use lambda::run;
+
+#[test]
+fn interpreter_can_read_and_interpret_file() {
+    let result = run("sample/test.txt");
+    assert_eq!("1", result);
+}