Added main.rs file

src/main.rs

@@ -0,0 +1,134 @@
+use std::fmt;
+use clap::Parser;
+
+
+/// Simple todo program
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    // parse the main command
+    #[arg(index=1)]
+    command: String,
+
+    // parse the main value
+    #[arg(index=2, default_value="")]
+    mainvalue: String,
+
+    // parse the subcommand
+    #[arg(short, long, action)]
+    all: bool,
+
+    #[arg(short, long, action)]
+    done: bool,
+
+    #[arg(short, long, action)]
+    category: Option<String>,
+}
+
+
+// create a struct of a task
+#[allow(dead_code)]
+struct Task<'a> {
+    id: u64,
+    name: &'a str,
+    done: bool,
+    category: &'a  str
+}
+
+// implement print for Task
+impl fmt::Display for Task<'_>{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if self.category == "" {
+            if self.done {
+                write!(f, "done | {} | {}", self.id, self.name)
+            } else {
+                write!(f, "not-done | {} | {}", self.id, self.name)
+            }
+        } else {
+            if self.done {
+                write!(f, "done | {} | {} | {}", self.id, self.name, self.category)
+            } else {
+                write!(f, "not-done | {} | {} | {}", self.id, self.name, self.category)
+            }
+        }
+    }
+}
+
+fn main() {
+    // parse arguments
+    let args = Args::parse();
+    // for list commands
+    if args.command == "list" {
+        if args.all {
+            // todo list --all --category _category_
+            if args.category != None {
+                let category_: String = args.category.to_owned().unwrap();
+                println!("You are trying to list all tasks in category: {}", category_);
+            } 
+            // todo list --all
+            else {    
+                println!("You are trying to print all tasks!");
+            }
+        }
+        else if args.done {
+            // todo list --done --category _category_
+            if args.category != None {
+                let category_: String = args.category.to_owned().unwrap();
+                println!("You have a category {}", category_);
+            }
+            // todo list --done
+            else {
+                println!("You are trying to print completed tasks!");
+            }
+        }
+        else {
+            // todo list --category _category_
+            if args.category != None {
+                let category_: String = args.category.to_owned().unwrap();
+                println!("You a printing default taks with category {}", category_);
+            }
+            // todo list
+            else {
+                println!("You are trying to list tasks");
+            }
+        }
+        
+    }
+    // for add command
+    else if args.command == "add" {
+        // todo add --category _category_ _task_
+        if args.category != None {
+            let category_: String = args.category.to_owned().unwrap();
+            let taskname: String = args.mainvalue;
+            println!("You are trying to add a task \"{}\" to category {}", taskname, category_);
+        }
+        // todo add _task_
+        else {
+            let taskname: String = args.mainvalue;
+            println!("You are trying to add a (uncategorized) task! \"{}\"", taskname);
+        }
+    }
+    // for did command
+    else if args.command == "did" {
+        // todo did _task_id_
+        let task_id: i64= args.mainvalue.parse::<i64>().unwrap();
+        println!("You are saying, you finished task with ID: {}", task_id);
+    }
+    else if args.command == "undid" {
+        // todo undid _task_id_
+        let task_id: i64= args.mainvalue.parse::<i64>().unwrap();
+        println!("You are saying, you haven't actually finished with ID: {}", task_id);
+    }
+    else if args.command == "update" {
+        // todo update --category _category_ _task_id_
+        if args.category != None {
+            let task_id: i64= args.mainvalue.parse::<i64>().unwrap();
+            println!("You are changing category of ID: {} to {}", task_id, args.category.to_owned().unwrap());
+        }
+        // todo update _task_id_
+        else {
+            let task_id: i64= args.mainvalue.parse::<i64>().unwrap();
+            println!("You are removing category of task with ID: {}", task_id);
+        }
+    }
+}