diff --git a/Cargo.lock b/Cargo.lock
index 70033a5..a405e4d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,12 +8,50 @@ version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "console"
+version = "0.15.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e1f83fc076bd6dd27517eacdf25fef6c4dfe5f1d7448bafaaf3a26f13b5e4eb"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "unicode-width",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "dialoguer"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "658bce805d770f407bc62102fca7c2c64ceef2fbcb2b8bd19d2765ce093980de"
+dependencies = [
+ "console",
+ "shell-words",
+ "tempfile",
+ "thiserror",
+ "zeroize",
+]
+
+[[package]]
+name = "encode_unicode"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
+
 [[package]]
 name = "errno"
 version = "0.3.9"
@@ -30,6 +68,23 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "486f806e73c5707928240ddc295403b1b93c96a02038563881c4a2fd84b81ac4"
 
+[[package]]
+name = "getrandom"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.164"
@@ -46,6 +101,8 @@ checksum = "78b3ae25bc7c8c38cec158d1f2757ee79e9b3740fbc7ccf0e59e4b08d793fa89"
 name = "mvw"
 version = "0.1.0"
 dependencies = [
+ "dialoguer",
+ "rand",
  "tempfile",
 ]
 
@@ -55,6 +112,63 @@ version = "1.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77957b295656769bb8ad2b6a6b09d897d94f05c41b069aede1fcdaa675eaea04"
+dependencies = [
+ "zerocopy",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f139b0662de085916d1fb67d2b4169d1addddda1919e696f3252b740b629986e"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "rustix"
 version = "0.38.41"
@@ -68,6 +182,23 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "shell-words"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24188a676b6ae68c3b2cb3a01be17fbf7240ce009799bb56d5b1409051e78fde"
+
+[[package]]
+name = "syn"
+version = "2.0.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25aa4ce346d03a6dcd68dd8b4010bcb74e54e62c90c573f394c46eae99aba32d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.14.0"
@@ -81,6 +212,44 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -162,3 +331,30 @@ name = "windows_x86_64_msvc"
 version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "byteorder",
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
diff --git a/Cargo.toml b/Cargo.toml
index 7ed2320..2859dac 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,3 +5,5 @@ edition = "2021"
 
 [dependencies]
 tempfile = "3.14.0"
+dialoguer = "0.11.0"
+rand = "0.8.5"
diff --git a/src/main.rs b/src/main.rs
index 300fdd6..5abca2b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,13 +1,24 @@
 use std::fs;
 use std::fs::File;
-use std::path::PathBuf;
-use std::path::Path;
-use std::io::ErrorKind;
-use std::io::Write;
+use std::path::{Path, PathBuf};
+use std::io::{ErrorKind, Write, BufRead, BufReader};
+use std::process;
+use std::process::Command;
+use std::collections::HashMap;
 use tempfile::NamedTempFile;
+use dialoguer::Confirm;
+use rand::distributions::{Alphanumeric, DistString};
 
 const LOCK_FILE: &str = ".mvwrap";
 
+struct Cleanup;
+
+impl Drop for Cleanup {
+    fn drop(&mut self) {
+        unlock_dir();
+    }
+}
+
 fn read_current_dir() -> Vec<String> {
     let paths : Vec<PathBuf> = match fs::read_dir(".") {
         Err(e) if e.kind() == ErrorKind::NotFound => Vec::new(),
@@ -47,7 +58,7 @@ fn unlock_dir() {
     }
 }
 
-fn create_temp_file(paths: Vec<String>) -> String {
+fn create_temp_file(paths: &Vec<String>) -> String {
     let mut tmpfile = match NamedTempFile::new(){
         Ok(file) => file,
         Err(e) => panic!("Could not create tempfile: {}", e),
@@ -67,35 +78,135 @@ fn create_temp_file(paths: Vec<String>) -> String {
     filepath
 }
 
-fn remove_temp_file(tmpfile: String) {
-    if Path::new(&tmpfile).is_file() {
-        let _result = match fs::remove_file(&tmpfile){
+fn remove_temp_file(tmpfile: &String) {
+    if Path::new(tmpfile).is_file() {
+        let _result = match fs::remove_file(tmpfile){
             Ok(result) => result,
-            Err(_) => panic!("Could not remove tempfile: {}", &tmpfile),
+            Err(_) => panic!("Could not remove tempfile: {}", tmpfile),
         };
     }
 }
 
-fn main() {
-    lock_dir();
+fn edit_temp_file(tmpfile: &String) {
+    let _output = Command::new("vi")
+        .arg(tmpfile)
+        .status()
+        .expect("failed to execute editor process");
 
+}
+
+fn read_temp_file(tmpfile: &String) -> Vec<String> {
+    let file = File::open(tmpfile).expect("no such file");
+    let buf = BufReader::new(file);
+    buf.lines()
+        .map(|l| l.expect("Could not parse line"))
+        .collect()
+}
+
+fn unique_length(dst_paths: &Vec<String>) -> usize {
+    let map = dst_paths.into_iter().map(|x| (x, x)).collect::<HashMap<_, _>>();
+    map.len()
+}
+
+fn unique_filename(dst_paths: &Vec<String>) -> String {
+    let mut string = Alphanumeric.sample_string(&mut rand::thread_rng(), 16);
+
+    // Generate unique name that does not exist in dir and is not in dst_paths
+    while dst_paths.iter().any(|j| j==&string) || Path::new(&string).is_file() {
+        string = Alphanumeric.sample_string(&mut rand::thread_rng(), 16);
+    }
+    string
+}
+
+fn move_safely(src_paths: &Vec<String>, dst_paths: &Vec<String>) {
+    let src_len = src_paths.len();
+    let mut intermediate_files: HashMap<String, String> = HashMap::new();
+
+    for i in 0..src_len {
+        if src_paths[i] != dst_paths[i] {
+            // is the destination already in the source list?
+            // if so, an intermediate file is needed
+            if src_paths.iter().any(|j| j==&dst_paths[i]) {
+                let unique = unique_filename(&dst_paths);
+                intermediate_files.insert(unique.clone(), dst_paths[i].clone());
+                fs::rename(&src_paths[i], &unique).expect("failed to rename file");
+                println!("Moving {} -> {}", src_paths[i], unique);
+            } else {
+                fs::rename(&src_paths[i], &dst_paths[i]).expect("failed to rename file");
+                println!("Moving {} -> {}", src_paths[i], dst_paths[i]);
+            }
+        }
+    }
+    for (src, dst) in intermediate_files.iter() {
+        fs::rename(&src, &dst).expect("failed to rename file");
+        println!("Moving {} -> {}", src, dst);
+    }
+}
+
+fn run_checks(src_paths: &Vec<String>, dst_paths: &Vec<String>) -> bool {
+    // Make sure there are an equal number of sources and destinations
+    if src_paths.len() != dst_paths.len() {
+        println!("ERROR: Source and target list don't have the same number of lines.");
+        return true
+    }
+
+    // Make sure destination names are not empty
+    if dst_paths.iter().any(|i| i=="") {
+        println!("ERROR: You can't move to empty names.");
+        return true
+    }
+
+    // Make sure all destination files are unique
+    let dst_paths_length_unique = unique_length(&dst_paths);
+    if dst_paths.len() != dst_paths_length_unique {
+        println!("Clashing destination names!");
+        // TODO: show which ones!
+        return true
+    }
+    false
+}
+
+fn main() {
+    // Place lockfile to not have multiple mvw processes running in the same dir at the same time
+    lock_dir();
+    let _cleanup = Cleanup; // Cleanup LOCK_FILE on panic
+
+    // read directory contents into vector of Strings
     let paths = read_current_dir();
 
     // create named tempfile and fill with paths
-    let temp_file = create_temp_file(paths);
+    let temp_file = create_temp_file(&paths);
 
-    // edit tempfile
+    //display_temp_file(&temp_file);
 
-    // read and process tempfile
-    println!("In file: {}", temp_file);
+    edit_temp_file(&temp_file);
 
-    let contents = fs::read_to_string(temp_file.clone())
-        .expect("Should have been able to read the file");
+    let mut new_paths = read_temp_file(&temp_file);
 
-    println!("With text:\n{contents}");
-    println!("----- END ----");
+    // Compare length, if not equal offer to try again (or panic for now)
+    while run_checks(&paths, &new_paths) {
 
-    remove_temp_file(temp_file);
+        let confirmation = Confirm::new()
+            .with_prompt("Continue editing?")
+            .interact()
+            .unwrap();
 
+        if ! confirmation {
+            unlock_dir();
+            process::exit(1);
+        }
+
+        edit_temp_file(&temp_file);
+        new_paths = read_temp_file(&temp_file);
+    }
+
+    // (also don't overwrite existing files that are not in the input list!)
+
+
+    move_safely(&paths, &new_paths);
+
+    //display_temp_file(&temp_file);
+
+    remove_temp_file(&temp_file);
     unlock_dir();
 }