updates

.github/workflows/docker-publish.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: docker login
         env:
           DOCKER_USER: ${{secrets.DOCKER_USER}}

.github/workflows/rust.yml

@@ -11,7 +11,7 @@ jobs:
     name: Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -25,7 +25,7 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -39,7 +39,7 @@ jobs:
     name: Format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -55,7 +55,7 @@ jobs:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2021 Thomas Chaplin
+Copyright (c) 2023 Thomas Chaplin
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

src/main.rs

@@ -1,10 +1,47 @@
-mod lib;
-use lib::calculate_percentage_change;
-use lib::get_input;
+use std::env::args;
 
 fn main() {
     let first = get_input(1);
     let second = get_input(2);
     let percentage_change = calculate_percentage_change(first, second);
     println!("{}", percentage_change);
 }
+
+pub fn get_input(index: usize) -> f32 {
+    let args: Vec<String> = args().collect();
+    let result: f32 = match args[index].trim().parse() {
+        Ok(num) => num,
+        Err(_) => panic!(
+            "Failed to read value \"{}\", we were expecting a u32 or f32!",
+            args[index].trim()
+        ),
+    };
+    result
+}
+
+pub fn calculate_percentage_change(first: f32, second: f32) -> String {
+    if first < second {
+        return format!("+{}%", (second - first) / first * 100.0);
+    }
+    if first > second {
+        format!("-{}%", (first - second) / first * 100.0)
+    } else {
+        "0%".to_string()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    fn test_calculate_percentage_change() {
+        assert_eq!(calculate_percentage_change(1_f32, 2_f32), "+100%");
+        assert_eq!(calculate_percentage_change(2_f32, 1_f32), "-50%");
+        assert_eq!(calculate_percentage_change(1_f32, 1_f32), "0%");
+        assert_eq!(calculate_percentage_change(1.2, 2.4), "+100%");
+        assert_eq!(calculate_percentage_change(2.4, 1.2), "-50%");
+        assert_eq!(calculate_percentage_change(1.1, 1.1), "0%");
+    }
+}