feat: implement expense tracker with CRUD operations and JSON storage

submissions/week-2/day-5/Abel-Osaretin/expense-tracker/.gitignore

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+/target

submissions/week-2/day-5/Abel-Osaretin/expense-tracker/Cargo.toml

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+[package]
+name = "expense-tracker"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+serde = {version = "1.0.228", features = ["derive"]}
+serde_json = "1.0.149"

submissions/week-2/day-5/Abel-Osaretin/expense-tracker/README.md

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+# Expense Tracker
+
+A simple CLI expense tracker built in Rust. It supports adding, viewing, updating, and removing expenses, and persists data to a JSON file between runs.
+
+## Assignment Requirements Checklist
+
+- Prints out operations a user can carry out.
+- Program keeps running after reading, adding, updating, or deleting.
+- User can quit the program with 'q' and is prompted y/n.
+- After updating or adding, the user can see the values they just added.
+- All interactions are written to a file (saved to JSON).
+- Abstracted into modules.
+
+## How It Works
+
+- Startup loads existing data from `expenses.json`.
+- Each expense has an `id`, `name`, `amount`, and `tx_type` (Credit/Debit).
+- Data is saved back to `expenses.json` after add/update/delete and on quit.
+
+## Run
+
+```bash
+cargo run
+```
+
+## Project Structure
+
+- `src/main.rs`: application entry point and menu loop.
+- `src/menu.rs`: menu options and selection logic.
+- `src/modules.rs`: feature modules (add/view/update/delete/quit).
+- `src/tracker.rs`: core tracker data model and persistence.
+- `expenses.json`: persisted data file.
+
+## Usage Tips
+
+- Enter the menu number (1-4) or name (`add`, `view`, `update`, `remove`), or `q` to quit.
+- On quit, confirm with `y` or `n`.

submissions/week-2/day-5/Abel-Osaretin/expense-tracker/expenses.json

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+{
+  "6": {
+    "id": 6,
+    "name": "Toy",
+    "amount": 22.0,
+    "tx_type": "Debit"
+  },
+  "3": {
+    "id": 3,
+    "name": "Food",
+    "amount": 345.0,
+    "tx_type": "Credit"
+  },
+  "4": {
+    "id": 4,
+    "name": "Meat",
+    "amount": 432.0,
+    "tx_type": "Debit"
+  },
+  "5": {
+    "id": 5,
+    "name": "Fish",
+    "amount": 677.0,
+    "tx_type": "Debit"
+  },
+  "1": {
+    "id": 1,
+    "name": "Cloth",
+    "amount": 555.0,
+    "tx_type": "Credit"
+  }
+}

submissions/week-2/day-5/Abel-Osaretin/expense-tracker/src/main.rs

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+mod menu; 
+mod modules;
+mod tracker;
+
+use menu::Menu;
+use std::io;
+use tracker::ExpenseTracker;
+
+fn main() {
+    let filename = "expenses.json";
+    let mut tracker = ExpenseTracker::new();
+
+    modules::username_module();
+    tracker.values = ExpenseTracker::load_from_file(filename);
+    if let Some(max_id) = tracker.values.keys().max() {
+        tracker.next_id = max_id + 1;
+    }
+
+    loop {
+        menu_module(&mut tracker, filename);
+    }
+}
+
+fn menu_module(tracker: &mut ExpenseTracker, filename: &str) {
+    let mut menu_input: String = String::new();
+
+    println!("Please select a menu number or name:");
+    println!(
+        "\n 1. {:#?}\n 2. {:#?}\n 3. {:#?}\n 4. {:#?}\n q. {:#?} ",
+        Menu::Add,
+        Menu::View,
+        Menu::Update,
+        Menu::Remove,
+        Menu::Quit
+    );
+
+    io::stdin()
+        .read_line(&mut menu_input)
+        .expect("Failed To Get Input");
+
+    let result = match Menu::menu_select(&menu_input) {
+        Some(result) => result,
+        None => {
+            println!("Invalid Menu");
+            return menu_module(tracker, filename);
+        }
+    };
+
+    match result {
+        Menu::Add => {
+            println!("-------------------------------------------------\n");
+            println!("Add Module");
+            println!("\n-------------------------------------------------\n");
+
+            let new_expenses = modules::add_module(tracker, filename);
+            tracker.save_to_file(filename);
+
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------");
+            println!("New {:#?}", new_expenses);
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------\n");
+        }
+        Menu::View => {
+            println!("-------------------------------------------------\n");
+            println!("View Module");
+            println!("\n-------------------------------------------------\n");
+            let all_expenses = modules::view_module(tracker);
+
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------");
+            println!("All Expenses:  {:#?}", all_expenses);
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------\n");
+        }
+        Menu::Update => {
+            println!("-------------------------------------------------\n");
+            println!("Update Module");
+            println!("\n-------------------------------------------------\n");
+
+            let updated_data = modules::update_module(tracker, filename);
+            tracker.save_to_file(filename);
+
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------");
+            println!("Updated Data  {:#?}", updated_data);
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------\n");
+        }
+        Menu::Remove => {
+            println!("-------------------------------------------------\n");
+            println!("\n-------------------------------------------------\n");
+            println!("Remove Module");
+
+            let result = modules::delete_module(tracker, filename);
+            tracker.save_to_file(filename);
+            println!("Expense Deleted: {result}");
+
+            println!("-------------------------------------------------");
+            println!("-------------------------------------------------\n");
+        }
+        Menu::Quit => {
+            println!("-------------------------------------------------\n");
+            println!("\n-------------------------------------------------\n");
+
+            println!("Quit Module");
+
+            modules::quit_module(tracker, filename);
+            println!("\n-------------------------------------------------\n");
+            println!("-------------------------------------------------\n");
+        }
+    }
+}

submissions/week-2/day-5/Abel-Osaretin/expense-tracker/src/menu.rs

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+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum Menu {
+    Add, View, Update, Remove, Quit,
+}
+
+impl Menu {
+    pub fn menu_select(selection: &str) -> Option<Menu> {
+        let selection = selection.trim().to_lowercase();
+        match selection.as_str() {
+            "add" | "1" => Some(Menu::Add),
+            "view" | "2" => Some(Menu::View),
+            "update" | "3" => Some(Menu::Update),
+            "remove" | "4" => Some(Menu::Remove),
+            "quit" | "q" => Some(Menu::Quit),
+            _ => None,
+        }
+    }
+}