item: Implement file dropping

And now you can take files out of your inventory! This should cover most
of the functionality.

src/item.rs

@@ -43,6 +43,23 @@ pub fn take(file: &String) {
     }
 }
 
-pub fn drop() {
-    // to be implemented
+pub fn drop(file: &String, dest: PathBuf) {
+    let ventodir = common::env_config();
+    let active: PathBuf = [ventodir.to_path_buf(), Path::new("active").to_path_buf()].iter().collect();
+    
+    let sourcepath: PathBuf = [&active, &Path::new(file).to_path_buf()].iter().collect();
+    let destpath: PathBuf = [Path::new(&dest).to_path_buf(), Path::new(file).to_path_buf()].iter().collect();
+
+    if Path::exists(&destpath) {
+        println!("❌ {}", format!("A file with the same name already exists in the destination! Try renaming it or dropping this file somewhere else.").red());
+    } else if sourcepath.is_file() | sourcepath.is_symlink() {
+        fs::copy(&sourcepath, &destpath).expect("❌ Vento was unable to copy the file.");
+        fs::remove_file(&sourcepath).expect("❌ Vento was unable to remove the file.");
+    } else if sourcepath.is_dir() {
+        let destpath: PathBuf = Path::new(&dest).to_path_buf();
+        let options = CopyOptions::new();
+        move_dir(&sourcepath, &destpath, &options).expect("❌ Vento was unable to move the directory.");
+    } else {
+        println!("❌ {}", format!("No such file or directory.").red());
+    }
 }

src/main.rs

@@ -18,6 +18,8 @@
  */
 
 use std::env;
+use std::process;
+use std::path::{Path, PathBuf};
 use colored::Colorize;
 
 mod inv;
@@ -44,7 +46,22 @@ fn main() {
                 } else {
                     println!("❌ {}", format!("You need to specify a file.").red())
                 };
-            }
+            },
+            "drop" => {
+                if args.len() == 3 {
+                    item::drop(&args[2], match env::current_dir() {
+                        Ok(dir) => dir,
+                        Err(_) => {
+                            println!("❌ {}", format!("Vento was unable to detect your current directory. Have you configured your environment correctly?").red());
+                            process::exit(1);
+                        }
+                    });
+                } else if args.len() == 4 {
+                    item::drop(&args[2], Path::new(&args[3]).to_path_buf());
+                } else {
+                    println!("❌ {}", format!("You need to specify a file.").red())
+                };
+            },
             _ => println!("❔ Command not found. Type \"vento help\" to see all commands available.")
        }
    } else {