8 files changed, 444 insertions, 0 deletions

diff --git a/src/backup.rs b/src/backup.rs
new file mode 100644
index 0000000..4e74c97
--- /dev/null
+++ b/src/backup.rs
@@ -0,0 +1,44 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use crate::{config::Config, pathinfo::PathInfo, packages::Package, error::Result};
+
+pub type BackupId = String;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Backup {
+    id: String,
+    timestamp: u64,
+    packages: Vec<Package>,
+    files: Vec<PathInfo>,
+}
+
+impl Backup {
+    pub fn create(config: &Config, packages: Vec<Package>) -> Result<Self> {
+        let mut files: Vec<PathInfo> = Vec::new();
+        for dir in &config.directories {
+            files.push(PathInfo::from_path(config, dir)?);
+        }
+        Ok(Self {
+            // UUID not really needed, maybe a shorter hash
+            id: Uuid::new_v4().to_string(),
+            timestamp: SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap()
+                .as_secs(),
+            packages,
+            files,
+        })
+    }
+
+    
+}
+
+struct BackupLocation {
+    id: BackupId,
+    rel_location: String,
+}
+
+type BackupList = Vec<BackupLocation>;
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..625118a
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,33 @@
+use config::{File, Map};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(default)]
+pub struct Config {
+    pub root: String,
+    pub user: Vec<String>,
+    pub directories: Vec<String>,
+    pub custom_directories: Map<String, String>
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            root: "/mnt/backup".to_string(),
+            user: vec![],
+            directories: vec![],
+            custom_directories: Map::new(),
+        }
+    }
+}
+
+impl Config {
+    pub fn load() -> Result<Self, config::ConfigError> {
+        let config = config::Config::builder()
+            .add_source(File::with_name("config.toml").required(false))
+            .add_source(config::Environment::with_prefix("FXBAUP").separator("_"))
+            .build()?;
+
+        config.try_deserialize()
+    }
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..77eab69
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,19 @@
+pub type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, PartialEq, Eq, thiserror::Error)]
+pub enum Error {
+    #[error("unknown custom directory '{0}'")]
+    CustomDirectory(String),
+
+    #[error("invalid directory index '{0}'")]
+    InvalidIndex(String),
+
+    #[error("no directory index given")]
+    NoIndex,
+
+    #[error("invalid directory '{0}'")]
+    InvalidDirectory(String),
+
+    #[error("Only exactly one user allowed in config")]
+    MultiUser,
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..1fdcebf
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,32 @@
+use backup::Backup;
+use config::Config;
+use packages::{pacman::Pacman, PackageManager};
+use storage::save_index;
+
+mod backup;
+mod config;
+mod error;
+mod pathinfo;
+mod packages;
+mod storage;
+
+fn main() -> anyhow::Result<()> {
+    let mut cfg = Config::load()?;
+    cfg.user.push("fx".to_string());
+    cfg.directories.push("~/.config/nvim".to_string());
+    cfg.directories.push("~/.config/hypr".to_string());
+    let toml = toml::to_string(&cfg)?;
+    println!("{toml}");
+
+    let pacman = Pacman;
+    let pkgs = pacman.get_installed();
+
+    let backup = Backup::create(&cfg, pkgs)?;
+    // println!("{backup:#?}");
+
+    save_index(backup);
+
+    // let fi = FileInfo::new("~/.config/nvim", &cfg)?;
+    // println!("{:?}", fi.get_absolute_path());
+    Ok(())
+}
diff --git a/src/packages.rs b/src/packages.rs
new file mode 100644
index 0000000..9f765d6
--- /dev/null
+++ b/src/packages.rs
@@ -0,0 +1,16 @@
+use serde::{Deserialize, Serialize};
+
+pub mod pacman;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Package {
+    pub id: String,
+    pub version: String,
+    pub explicit: bool
+}
+
+pub trait PackageManager {
+    fn get_installed(&self) -> Vec<Package>;
+
+    fn install(&self, pkgs: Vec<Package>);
+}
diff --git a/src/packages/pacman.rs b/src/packages/pacman.rs
new file mode 100644
index 0000000..0a9e1ff
--- /dev/null
+++ b/src/packages/pacman.rs
@@ -0,0 +1,46 @@
+use std::process::Command;
+
+use crate::packages::Package;
+
+use super::PackageManager;
+
+pub struct Pacman;
+
+impl PackageManager for Pacman {
+    fn get_installed(&self) -> Vec<super::Package> {
+        let pm_pkgs = Command::new("pacman").args(["-Q"]).output().unwrap();
+        let pm_e_pkgs = Command::new("pacman")
+            .args(["-Q", "--explicit"])
+            .output()
+            .unwrap();
+
+        let pm_pkgs_out = String::from_utf8(pm_pkgs.stdout).unwrap();
+        let pm_e_pkgs_out = String::from_utf8(pm_e_pkgs.stdout).unwrap();
+
+        let mut pkgs: Vec<Package> = Vec::new();
+        let pacman_pkgs: Vec<&str> = pm_pkgs_out.split('\n').collect();
+        for pkg in pacman_pkgs {
+            if pkg.is_empty() {
+                continue;
+            };
+            let split: Vec<&str> = pkg.split_whitespace().collect();
+            if split.len() != 2 {
+                panic!("Unknown Pacman Output");
+            };
+
+            let explicit = pm_e_pkgs_out.contains(pkg);
+
+            pkgs.push(Package {
+                id: split[0].to_string(),
+                version: split[1].to_string(),
+                explicit
+            })
+        }
+
+        pkgs
+    }
+
+    fn install(&self, pkgs: Vec<Package>) {
+        todo!();
+    }
+}
diff --git a/src/pathinfo.rs b/src/pathinfo.rs
new file mode 100644
index 0000000..b0c3be4
--- /dev/null
+++ b/src/pathinfo.rs
@@ -0,0 +1,246 @@
+use std::{
+    fmt::Display,
+    path::PathBuf,
+};
+
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    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>
+}
+
+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)?)
+    }
+
+    fn handle_dir(
+        config: &Config,
+        rel_location: &str,
+        location_root: &LocationRoot,
+    ) -> Result<Self> {
+        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 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 Some(rl) = pathstr.split_once(&root) else {
+                    panic!("HUH");
+                };
+                let handle = Self::handle_dir(config, rl.1, location_root)?;
+                if handle.modified {
+                    modified = true;
+                };
+                children.push(handle);
+            }
+            Self {
+                modified,
+                is_file: false,
+                rel_location: rel_location.to_string(),
+                location_root: location_root.clone(),
+                last_modified: "".to_string(),
+                children
+            }
+        } else {
+            Self::from_file(rel_location, location_root.clone())?
+        })
+    }
+
+    fn from_file(rel_location: &str, location_root: LocationRoot) -> Result<Self> {
+        println!("From file {rel_location}");
+
+        let modified = false;
+
+        Ok(Self {
+            rel_location: rel_location.to_string(),
+            location_root,
+            modified,
+            last_modified: "".to_string(),
+            is_file: true,
+            children: Vec::new()
+        })
+    }
+
+    pub fn get_absolute_path(&self) -> PathBuf {
+        Self::get_abs_path(&self.location_root.to_string(), &self.rel_location)
+    }
+
+    fn get_abs_path(location_root: &str, rel_location: &str) -> PathBuf {
+        let path = format!("{}/{}", location_root, rel_location);
+        PathBuf::from(path)
+    }
+
+    fn parse_location(value: &str, config: &Config) -> Result<(String, LocationRoot)> {
+        let Some(split) = value.split_once('/') else {
+            return Err(Error::InvalidDirectory(value.to_string()));
+        };
+        if split.0.starts_with('~') {
+            if config.user.len() != 1 {
+                return Err(Error::MultiUser);
+            }
+            return Ok((
+                split.1.to_string(),
+                LocationRoot::User(config.user[0].clone()),
+            ));
+        };
+        Ok((
+            split.1.to_string(),
+            LocationRoot::from_op_str(split.0, config)?,
+        ))
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub enum LocationRoot {
+    User(String),
+    Custom(String),
+    SystemSettings,
+    Root,
+}
+
+impl Display for LocationRoot {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            LocationRoot::User(user) => write!(f, "/home/{user}"),
+            LocationRoot::Custom(loc) => write!(f, "{loc}"),
+            LocationRoot::SystemSettings => write!(f, "/etc"),
+            LocationRoot::Root => write!(f, "/"),
+        }
+    }
+}
+
+impl LocationRoot {
+    fn from_op_str(value: &str, config: &Config) -> Result<Self> {
+        let split_str = value.split_once(':');
+        let Some(split_op) = split_str else {
+            return Err(Error::NoIndex);
+        };
+        match split_op.0 {
+            "u" => Ok(Self::User(split_op.1.to_string())),
+            "s" => Ok(Self::SystemSettings),
+            "r" => Ok(Self::Root),
+            "c" => Ok(Self::Custom(
+                config
+                    .custom_directories
+                    .get(split_op.1)
+                    .ok_or_else(|| Error::CustomDirectory(split_op.1.to_string()))?
+                    .to_string(),
+            )),
+            _ => Err(Error::InvalidIndex(split_op.0.to_string())),
+        }
+    }
+}
+
+#[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(())
+    }
+}
diff --git a/src/storage.rs b/src/storage.rs
new file mode 100644
index 0000000..b9e8de9
--- /dev/null
+++ b/src/storage.rs
@@ -0,0 +1,8 @@
+use std::{fs::File, io::Write};
+
+use crate::backup::Backup;
+
+pub fn save_index(backup: Backup) {
+    let mut f = File::create("./index.json").unwrap();
+    f.write_all(&serde_json::to_vec(&backup).unwrap()).unwrap();
+}