8 files changed, 387 insertions, 182 deletions

diff --git a/src/backup.rs b/src/backup.rs
index 8cc94f1..a643cb2 100644
--- a/src/backup.rs
+++ b/src/backup.rs
@@ -5,7 +5,6 @@ use std::{
     time::{SystemTime, UNIX_EPOCH},
 };
 
-use gethostname::gethostname;
 use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
@@ -20,10 +19,11 @@ pub type BackupId = String;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Backup {
-    id: String,
+    pub id: String,
     timestamp: u64,
     packages: Vec<Package>,
-    files: Vec<PathInfo>,
+    pub files: Vec<PathInfo>,
+    device: String,
 }
 
 impl Backup {
@@ -33,63 +33,82 @@ impl Backup {
             files.push(PathInfo::from_path(config, dir)?);
         }
         Ok(Self {
-            // UUID not really needed, maybe a shorter hash
+            // TODO: UUID not really needed, maybe a shorter hash
             id: Uuid::new_v4().to_string(),
             timestamp: Self::get_timestamp(),
             packages,
             files,
+            device: config.device.clone(),
         })
     }
 
     pub fn save(&self, config: &Config) -> Result<()> {
-        let rel_location = format!(
-            "{}_{}",
-            gethostname()
-                .into_string()
-                .map_err(|_| Error::InvalidOsString)?,
-            Self::get_timestamp()
-        );
-
-        let bl = BackupLocation {
-            id: self.id.to_string(),
-            rel_location,
-        };
-
-        Self::append_to_root_index(config, bl.clone())?;
+        println!("Save Backup {:?}", self.get_location(config));
+        // println!("{self:#?}");
+        self.get_location(config).append_to_root(config)?;
 
-        let backup_root = format!("{}/{}", config.root, bl.rel_location);
+        let backup_root = self.get_location(config).get_absolute_dir(config);
         create_dir_all(&backup_root).unwrap();
         let path = format!("{}/index.json", backup_root);
         let mut f = File::create(path).unwrap();
         f.write_all(&serde_json::to_vec(self).unwrap()).unwrap();
 
+        for path in &self.files {
+            path.save(&backup_root)?;
+        }
+
         Ok(())
     }
 
-    pub fn get_index(config: &Config, id: Option<BackupId>) -> Result<Self> {
+    pub fn get_last(config: &Config) -> Result<Option<Self>> {
         let backup_index_root = format!("{}/index.json", config.root);
-        let list: Vec<BackupLocation> = Self::get_json_content(&backup_index_root)?;
-        println!("{list:#?}");
-
-        let index_loc = if let Some(id) = id {
-            list.iter()
-                .find(|bl| bl.id == id)
-                .ok_or(Error::BackupNotFound)?
-                .rel_location
-                .clone()
-        } else {
-            list.last()
-                .ok_or(Error::BackupNotFound)?
-                .rel_location
-                .clone()
+        let list: Vec<BackupLocation> = match Self::get_json_content(&backup_index_root) {
+            Ok(list) => list,
+            Err(err) => {
+                if err.to_string() == "io: No such file or directory (os error 2)" {
+                    return Ok(None);
+                };
+                return Err(err);
+            }
         };
 
+        Ok(Some(Self::from_index(
+            config,
+            list.last().ok_or(Error::BackupNotFound)?.id.clone(),
+        )?))
+    }
+
+    pub fn from_index(config: &Config, id: BackupId) -> Result<Self> {
+        let backup_index_root = format!("{}/index.json", config.root);
+        let list: Vec<BackupLocation> = Self::get_json_content(&backup_index_root)?;
+        let index_loc = list
+            .iter()
+            .find(|bl| bl.id == id)
+            .ok_or(Error::BackupNotFound)?
+            .rel_location
+            .clone();
+
         let path = format!("{}/{index_loc}/index.json", config.root);
         let index_file: Self = Self::get_json_content(&path)?;
 
         Ok(index_file)
     }
 
+    pub fn get_location(&self, config: &Config) -> BackupLocation {
+        let rel_location = format!("{}_{}", config.device, self.timestamp);
+
+        BackupLocation {
+            id: self.id.to_string(),
+            rel_location,
+        }
+    }
+
+    pub fn get_absolute_file_location(&self, config: &Config, rel_location: &str) -> String {
+        let loc = self.get_location(config).get_absolute_dir(config);
+
+        format!("{}/{}", loc, rel_location)
+    }
+
     fn get_json_content<T: for<'a> Deserialize<'a>>(path: &str) -> Result<T> {
         let mut file = File::open(path)?;
         let mut content = String::new();
@@ -97,7 +116,26 @@ impl Backup {
         Ok(serde_json::from_str(&content)?)
     }
 
-    fn append_to_root_index(config: &Config, new_backup: BackupLocation) -> Result<()> {
+    fn get_timestamp() -> u64 {
+        SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
+            .as_secs()
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BackupLocation {
+    id: BackupId,
+    rel_location: String,
+}
+
+impl BackupLocation {
+    pub fn get_absolute_dir(&self, config: &Config) -> String {
+        format!("{}/{}", config.root, self.rel_location)
+    }
+
+    pub fn append_to_root(&self, config: &Config) -> Result<()> {
         let backup_index_root = format!("{}/index.json", config.root);
         let path = PathBuf::from(&backup_index_root);
         if path.exists() {
@@ -107,27 +145,15 @@ impl Backup {
             let mut loc: Vec<BackupLocation> = serde_json::from_str(&content)?;
 
             let mut f = File::create(path)?;
-            loc.push(new_backup);
+            loc.push(self.clone());
 
             f.write_all(&serde_json::to_vec(&loc)?)?;
         } else {
+            create_dir_all(&config.root).unwrap();
             let mut f = File::create(backup_index_root)?;
-            f.write_all(&serde_json::to_vec(&vec![new_backup])?)?;
+            f.write_all(&serde_json::to_vec(&vec![self])?)?;
         };
 
         Ok(())
     }
-
-    fn get_timestamp() -> u64 {
-        SystemTime::now()
-            .duration_since(UNIX_EPOCH)
-            .unwrap()
-            .as_secs()
-    }
-}
-
-#[derive(Debug, Clone, Serialize, Deserialize)]
-struct BackupLocation {
-    id: BackupId,
-    rel_location: String,
 }
diff --git a/src/config.rs b/src/config.rs
index 625118a..439c17c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -7,7 +7,8 @@ pub struct Config {
     pub root: String,
     pub user: Vec<String>,
     pub directories: Vec<String>,
-    pub custom_directories: Map<String, String>
+    pub custom_directories: Map<String, String>,
+    pub device: String,
 }
 
 impl Default for Config {
@@ -17,6 +18,9 @@ impl Default for Config {
             user: vec![],
             directories: vec![],
             custom_directories: Map::new(),
+            device: gethostname::gethostname()
+                .into_string()
+                .expect("invalid hostname string"),
         }
     }
 }
diff --git a/src/error.rs b/src/error.rs
index 6afa3d0..c43c1fc 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -17,12 +17,13 @@ pub enum Error {
     #[error("Only exactly one user allowed in config")]
     MultiUser,
 
-    #[error("OsString couldn't be converted to string")]
-    InvalidOsString,
-
     #[error("Requested backup not found")]
     BackupNotFound,
 
+    // Packages
+    #[error("Unknown Package Manger Output")]
+    UnknownOutput,
+
     #[error("json: {source}")]
     SerdeJson {
         #[from]
diff --git a/src/main.rs b/src/main.rs
index d5ccb75..acb728f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,18 +16,23 @@ fn main() -> color_eyre::Result<()> {
     cfg.directories.push("~/.config/nvim".to_string());
     cfg.directories.push("~/.config/hypr".to_string());
     cfg.root = "./backup".to_string();
+    // cfg.root = "./backup-test".to_string();
+    // cfg.directories.push("u:/code/proj/fxbaup/backup-test-dir".to_string());
 
     let pacman = Pacman;
-    let pkgs = pacman.get_installed();
+    let pkgs = pacman.get_installed()?;
 
     let backup = Backup::create(&cfg, pkgs)?;
-    println!("{backup:#?}");
+    // println!("{backup:#?}");
 
-    // backup.save(&cfg)?;
+    backup.save(&cfg)?;
 
-    let index = Backup::get_index(&cfg, None)?;
+    // PathInfo::compare_to_last_modified(&cfg, &LocationRoot::User("fx".to_string()), "code/proj/fxbaub/backup-test-dir/size.txt")?;
+    // PathInfo::compare_to_last_modified(&cfg, &LocationRoot::User("fx".to_string()), "code/proj/fxbaub/backup-test-dir/content.txt")?;
 
-    println!("{index:#?}");
+    // let index = Backup::get_index(&cfg, None)?;
+
+    // println!("{index:#?}");
 
     // let fi = FileInfo::new("~/.config/nvim", &cfg)?;
     // println!("{:?}", fi.get_absolute_path());
diff --git a/src/packages.rs b/src/packages.rs
index 9f765d6..7ac1736 100644
--- a/src/packages.rs
+++ b/src/packages.rs
@@ -1,6 +1,9 @@
 use serde::{Deserialize, Serialize};
 
+use crate::error::Result;
+
 pub mod pacman;
+pub mod portage;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Package {
@@ -10,7 +13,7 @@ pub struct Package {
 }
 
 pub trait PackageManager {
-    fn get_installed(&self) -> Vec<Package>;
+    fn get_installed(&self) -> Result<Vec<Package>>;
 
     fn install(&self, pkgs: Vec<Package>);
 }
diff --git a/src/packages/pacman.rs b/src/packages/pacman.rs
index 0a9e1ff..b5be4c0 100644
--- a/src/packages/pacman.rs
+++ b/src/packages/pacman.rs
@@ -1,13 +1,13 @@
 use std::process::Command;
 
-use crate::packages::Package;
+use super::{Package, PackageManager};
 
-use super::PackageManager;
+use crate::error::{Error, Result};
 
 pub struct Pacman;
 
 impl PackageManager for Pacman {
-    fn get_installed(&self) -> Vec<super::Package> {
+    fn get_installed(&self) -> Result<Vec<super::Package>> {
         let pm_pkgs = Command::new("pacman").args(["-Q"]).output().unwrap();
         let pm_e_pkgs = Command::new("pacman")
             .args(["-Q", "--explicit"])
@@ -25,7 +25,7 @@ impl PackageManager for Pacman {
             };
             let split: Vec<&str> = pkg.split_whitespace().collect();
             if split.len() != 2 {
-                panic!("Unknown Pacman Output");
+                return Err(Error::UnknownOutput);
             };
 
             let explicit = pm_e_pkgs_out.contains(pkg);
@@ -33,14 +33,14 @@ impl PackageManager for Pacman {
             pkgs.push(Package {
                 id: split[0].to_string(),
                 version: split[1].to_string(),
-                explicit
+                explicit,
             })
         }
 
-        pkgs
+        Ok(pkgs)
     }
 
-    fn install(&self, pkgs: Vec<Package>) {
+    fn install(&self, _pkgs: Vec<super::Package>) {
         todo!();
     }
 }
diff --git a/src/packages/portage.rs b/src/packages/portage.rs
new file mode 100644
index 0000000..6b9e508
--- /dev/null
+++ b/src/packages/portage.rs
@@ -0,0 +1,13 @@
+use super::PackageManager;
+
+pub struct Portage;
+
+impl PackageManager for Portage {
+    fn get_installed(&self) -> crate::error::Result<Vec<super::Package>> {
+        todo!()
+    }
+
+    fn install(&self, pkgs: Vec<super::Package>) {
+        todo!()
+    }
+}
diff --git a/src/pathinfo.rs b/src/pathinfo.rs
index be43b6e..641e7ef 100644
--- a/src/pathinfo.rs
+++ b/src/pathinfo.rs
@@ -1,31 +1,32 @@
 use std::{
     fmt::Display,
-    path::PathBuf,
+    fs::{create_dir_all, File},
+    io::Read,
+    path::{Path, PathBuf},
 };
 
 use serde::{Deserialize, Serialize};
 
 use crate::{
-    backup::BackupId,
+    backup::{Backup, BackupId},
     config::Config,
     error::{Error, Result},
 };
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct PathInfo {
-    pub modified: bool,
     pub is_file: bool,
     rel_location: String,
     location_root: LocationRoot,
-    last_modified: BackupId,
-    children: Vec<PathInfo>
+    last_modified: Option<BackupId>,
+    pub children: Vec<PathInfo>,
 }
 
 impl PathInfo {
     pub fn from_path(config: &Config, path: &str) -> Result<Self> {
         let locations = Self::parse_location(path, config)?;
 
-        Ok(Self::handle_dir(config, &locations.0, &locations.1)?)
+        Self::handle_dir(config, &locations.0, &locations.1)
     }
 
     fn handle_dir(
@@ -36,54 +37,129 @@ impl PathInfo {
         println!("Handling {rel_location}");
         let path = Self::get_abs_path(&location_root.to_string(), rel_location);
         Ok(if path.is_dir() {
-            let mut modified = false;
+            let mut last_modified = None;
             let mut children: Vec<PathInfo> = Vec::new();
 
             let paths = std::fs::read_dir(path).unwrap();
             for path in paths {
                 let pathstr = path.unwrap().path().to_string_lossy().to_string();
-                let root = format!("{}/", location_root.to_string());
+                let root = format!("{location_root}/");
                 let Some(rl) = pathstr.split_once(&root) else {
                     panic!("HUH");
                 };
                 let handle = Self::handle_dir(config, rl.1, location_root)?;
-                if handle.modified {
-                    modified = true;
+                if handle.last_modified.is_some() {
+                    // FIX: Check if new last modified is newer than old one
+                    last_modified = handle.last_modified.clone();
                 };
                 children.push(handle);
             }
             Self {
-                modified,
                 is_file: false,
                 rel_location: rel_location.to_string(),
                 location_root: location_root.clone(),
-                last_modified: "".to_string(),
-                children
+                last_modified,
+                children,
             }
         } else {
-            Self::from_file(rel_location, location_root.clone())?
+            Self::from_file(config, rel_location, location_root)?
         })
     }
 
-    fn from_file(rel_location: &str, location_root: LocationRoot) -> Result<Self> {
-        println!("From file {rel_location}");
+    fn from_file(
+        config: &Config,
+        rel_location: &str,
+        location_root: &LocationRoot,
+    ) -> Result<Self> {
+        let last_modified = Self::compare_to_last_modified(config, location_root, rel_location)?;
 
-        let modified = false;
+        println!("From file {rel_location} ({:?})", last_modified);
 
         Ok(Self {
             rel_location: rel_location.to_string(),
-            location_root,
-            modified,
-            last_modified: "".to_string(),
+            location_root: location_root.clone(),
+            last_modified,
             is_file: true,
-            children: Vec::new()
+            children: Vec::new(),
         })
     }
 
+    pub fn compare_to_last_modified(
+        config: &Config,
+        location_root: &LocationRoot,
+        rel_location: &str,
+    ) -> Result<Option<String>> {
+        let Some(last_backup) = Backup::get_last(config)? else {
+            // First Backup
+            return Ok(None);
+        };
+
+
+        let files = last_backup.files.clone();
+        let last_file_opt = files.iter().find(|file| file.rel_location == rel_location && file.location_root == *location_root);
+
+        let Some(last_file) = last_file_opt else {
+            // File didn't exist last Backup
+            println!("File didn't exist last Backup");
+            return Ok(None);
+        };
+
+        let modified_backup = if let Some(modified_backup_id) = last_file.last_modified.clone() {
+            Backup::from_index(config, modified_backup_id)?
+        } else {
+            last_backup
+        };
+
+        let old_path = modified_backup.get_absolute_file_location(config, &last_file.rel_location);
+        let new_path = format!("{location_root}/{rel_location}");
+
+        let mut old = File::open(old_path)?;
+        let mut new = File::open(new_path)?;
+
+        let old_len = old.metadata()?.len();
+        let new_len = new.metadata()?.len();
+        if old_len != new_len {
+            return Ok(None);
+        }
+
+        let mut old_content = String::new();
+        old.read_to_string(&mut old_content)?;
+        let mut new_content = String::new();
+        new.read_to_string(&mut new_content)?;
+        if old_content != new_content {
+            return Ok(None);
+        }
+
+        Ok(Some(modified_backup.id.clone()))
+    }
+
     pub fn get_absolute_path(&self) -> PathBuf {
         Self::get_abs_path(&self.location_root.to_string(), &self.rel_location)
     }
 
+    pub fn save(&self, backup_root: &str) -> Result<()> {
+        if self.last_modified.is_some() {
+            return Ok(());
+        }
+        println!("Save File {:?}", self.rel_location);
+        if !self.is_file {
+            for child in &self.children {
+                child.save(backup_root)?;
+            }
+        } else {
+            let new_path = format!("{}/{}", backup_root, self.rel_location);
+            // println!("New Path: {new_path}");
+            // println!("Old Path: {:?}", self.get_absolute_path());
+            let np = Path::new(&new_path);
+            if let Some(parent) = np.parent() {
+                create_dir_all(parent)?;
+            }
+            std::fs::copy(self.get_absolute_path(), new_path)?;
+        };
+
+        Ok(())
+    }
+
     fn get_abs_path(location_root: &str, rel_location: &str) -> PathBuf {
         let path = format!("{}/{}", location_root, rel_location);
         PathBuf::from(path)
@@ -150,97 +226,174 @@ impl LocationRoot {
     }
 }
 
-// #[cfg(test)]
-// mod tests {
-//     use crate::{
-//         config::Config,
-//         error::{Error, Result},
-//         pathinfo::PathInfo,
-//     };
-// 
-//     use super::LocationRoot;
-// 
-//     #[test]
-//     fn from_op_str() -> Result<()> {
-//         let mut config = Config::default();
-//         config
-//             .custom_directories
-//             .insert("test".to_string(), "/usr/local/test".to_string());
-// 
-//         let mut values: Vec<(&str, Result<LocationRoot>)> = Vec::new();
-//         values.push(("u:test", Ok(LocationRoot::User("test".to_string()))));
-//         values.push(("s:", Ok(LocationRoot::SystemSettings)));
-//         values.push(("r:", Ok(LocationRoot::Root)));
-//         values.push((
-//             "c:test",
-//             Ok(LocationRoot::Custom("/usr/local/test".to_string())),
-//         ));
-//         values.push(("c:rest", Err(Error::CustomDirectory("rest".to_string()))));
-//         values.push(("t:test/", Err(Error::InvalidIndex("t".to_string()))));
-//         values.push((
-//             "test:test/usr",
-//             Err(Error::InvalidIndex("test".to_string())),
-//         ));
-//         values.push(("/usr/local/test", Err(Error::NoIndex)));
-//         values.push(("c/usr/local/test", Err(Error::NoIndex)));
-// 
-//         for value in values {
-//             print!("Testing {value:?}");
-//             assert_eq!(LocationRoot::from_op_str(value.0, &config), value.1);
-//             println!("\rTesting {value:?} ✓");
-//         }
-// 
-//         Ok(())
-//     }
-// 
-//     #[test]
-//     fn parse_location() -> Result<()> {
-//         let mut config = Config::default();
-//         config.user.push("test".to_string());
-//         config
-//             .custom_directories
-//             .insert("test".to_string(), "/usr/local/test".to_string());
-// 
-//         let mut values: Vec<(&str, Result<(String, LocationRoot)>)> = Vec::new();
-//         values.push((
-//             "~/.config/nvim",
-//             Ok((
-//                 ".config/nvim".to_string(),
-//                 LocationRoot::User("test".to_string()),
-//             )),
-//         ));
-//         values.push((
-//             "u:test/.config/nvim",
-//             Ok((
-//                 ".config/nvim".to_string(),
-//                 LocationRoot::User("test".to_string()),
-//             )),
-//         ));
-//         values.push((
-//             "r:/.config/nvim",
-//             Ok((".config/nvim".to_string(), LocationRoot::Root)),
-//         ));
-//         values.push((
-//             "r:/.config/nvim",
-//             Ok((".config/nvim".to_string(), LocationRoot::Root)),
-//         ));
-//         values.push((
-//             "s:/.config/nvim",
-//             Ok((".config/nvim".to_string(), LocationRoot::SystemSettings)),
-//         ));
-//         values.push((
-//             "c:test/.config/nvim",
-//             Ok((
-//                 ".config/nvim".to_string(),
-//                 LocationRoot::Custom("/usr/local/test".to_string()),
-//             )),
-//         ));
-// 
-//         for value in values {
-//             print!("Testing {value:?}");
-//             assert_eq!(PathInfo::parse_location(&value.0, &config), value.1);
-//             println!("\rTesting {value:?} ✓");
-//         }
-//         Ok(())
-//     }
-// }
+#[cfg(test)]
+mod tests {
+    use std::{
+        fs::{create_dir_all, remove_dir_all, File},
+        io::Write,
+    };
+
+    use crate::{
+        backup::Backup,
+        config::Config,
+        error::{Error, Result},
+        packages::{pacman::Pacman, PackageManager},
+    };
+
+    use super::LocationRoot;
+    use super::PathInfo;
+
+    #[test]
+    fn from_op_str() -> Result<()> {
+        let mut config = Config::default();
+        config
+            .custom_directories
+            .insert("test".to_string(), "/usr/local/test".to_string());
+
+        let mut values_ok: Vec<(&str, LocationRoot)> = Vec::new();
+        values_ok.push(("u:test", LocationRoot::User("test".to_string())));
+        values_ok.push(("s:", LocationRoot::SystemSettings));
+        values_ok.push(("r:", LocationRoot::Root));
+        values_ok.push((
+            "c:test",
+            LocationRoot::Custom("/usr/local/test".to_string()),
+        ));
+
+        for value in values_ok {
+            println!("Testing {value:?}");
+            assert_eq!(LocationRoot::from_op_str(value.0, &config)?, value.1);
+            println!("\x1B[FTesting {value:?} ✓");
+        }
+
+        let mut values_err: Vec<(&str, String)> = Vec::new();
+        values_err.push((
+            "c:rest",
+            Error::CustomDirectory("rest".to_string()).to_string(),
+        ));
+        values_err.push(("t:test/", Error::InvalidIndex("t".to_string()).to_string()));
+        values_err.push((
+            "test:test/usr",
+            Error::InvalidIndex("test".to_string()).to_string(),
+        ));
+        values_err.push(("/usr/local/test", Error::NoIndex.to_string()));
+        values_err.push(("c/usr/local/test", Error::NoIndex.to_string()));
+
+        for value in values_err {
+            println!("Testing {value:?}");
+            assert_eq!(
+                LocationRoot::from_op_str(value.0, &config)
+                    .err()
+                    .unwrap()
+                    .to_string(),
+                value.1
+            );
+            println!("\x1B[FTesting {value:?} ✓");
+        }
+
+        Ok(())
+    }
+
+    #[test]
+    fn parse_location() -> Result<()> {
+        let mut config = Config::default();
+        config.user.push("test".to_string());
+        config
+            .custom_directories
+            .insert("test".to_string(), "/usr/local/test".to_string());
+
+        let mut values_ok: Vec<(&str, (String, LocationRoot))> = Vec::new();
+        values_ok.push((
+            "~/.config/nvim",
+            (
+                ".config/nvim".to_string(),
+                LocationRoot::User("test".to_string()),
+            ),
+        ));
+        values_ok.push((
+            "u:test/.config/nvim",
+            (
+                ".config/nvim".to_string(),
+                LocationRoot::User("test".to_string()),
+            ),
+        ));
+        values_ok.push((
+            "r:/.config/nvim",
+            (".config/nvim".to_string(), LocationRoot::Root),
+        ));
+        values_ok.push((
+            "r:/.config/nvim",
+            (".config/nvim".to_string(), LocationRoot::Root),
+        ));
+        values_ok.push((
+            "s:/.config/nvim",
+            (".config/nvim".to_string(), LocationRoot::SystemSettings),
+        ));
+        values_ok.push((
+            "c:test/.config/nvim",
+            (
+                ".config/nvim".to_string(),
+                LocationRoot::Custom("/usr/local/test".to_string()),
+            ),
+        ));
+
+        for value in values_ok {
+            print!("Testing {value:?}");
+            assert_eq!(PathInfo::parse_location(&value.0, &config)?, value.1);
+            println!("\x1B[FTesting {value:?} ✓");
+        }
+        Ok(())
+    }
+
+    #[test]
+    fn compare_to_last_modified() -> color_eyre::Result<()> {
+        let mut config = Config::default();
+        config.root = "./backup-test".to_string();
+        config
+            .directories
+            .push("u:fx/code/proj/fxbaup/backup-test-dir".to_string());
+
+        create_dir_all("./backup-test-dir")?;
+        let mut f = File::create("./backup-test-dir/size.txt")?;
+        f.write_all("unmodified".as_bytes())?;
+        let mut f = File::create("./backup-test-dir/content.txt")?;
+        f.write_all("unmodified".as_bytes())?;
+        let mut f = File::create("./backup-test-dir/nothing.txt")?;
+        f.write_all("unmodified".as_bytes())?;
+
+        let pacman = Pacman;
+        let pkgs = pacman.get_installed()?;
+        let backup = Backup::create(&config, pkgs)?;
+        backup.save(&config)?;
+
+        let mut f = File::create("./backup-test-dir/size.txt")?;
+        f.write_all("modified".as_bytes())?;
+        let mut f = File::create("./backup-test-dir/content.txt")?;
+        f.write_all("unmodefied".as_bytes())?;
+
+        let pi = PathInfo::from_path(&config, "u:fx/code/proj/fxbaup/backup-test-dir")?;
+
+        let last_backup = Backup::get_last(&config)?.unwrap();
+        for file in pi.children {
+            println!("test rel: {}", file.rel_location);
+            let res = if file.rel_location == "code/proj/fxbaup/backup-test-dir/nothing.txt" {
+                Some(last_backup.id.clone())
+            } else {
+                None
+            };
+            println!("Testing {file:?}");
+            assert_eq!(
+                PathInfo::compare_to_last_modified(
+                    &config,
+                    &file.location_root,
+                    &file.rel_location
+                )?,
+                res
+            );
+            println!("\x1B[FTesting {file:?} ✓");
+        }
+
+        remove_dir_all("./backup-test-dir")?;
+        remove_dir_all("./backup-test")?;
+        Ok(())
+    }
+}