feat: pure subcommand

src/main.rs

@@ -30,7 +30,7 @@ mod world;
 use error::*;
 
 use crate::{
-    package_manager::get_system_state,
+    package_manager::{get_system_state, get_unneeded_packages, remove_packages},
     world::{World, get_world_location},
 };
 
@@ -40,7 +40,7 @@ compile_error!("'yay' and 'paru' are mutually exclusive and cannot be enabled to
 #[cfg(not(target_os = "linux"))]
 compile_error!("Only (Arch) linux is supported!");
 
-const PRIVLAGE_ESCELATE_COMMAND: &str = "sudo";
+pub const PRIVLAGE_ESCELATE_COMMAND: &str = "sudo";
 
 #[derive(Parser)]
 struct Args {
@@ -233,7 +233,27 @@ fn main() -> Result<()> {
                 print!("{}", s);
             }
         }
-        Commands::Pure { all } => todo!(),
+        Commands::Pure { all } => {
+            let world = World::load_from(world_path)?;
+            let state = get_system_state()?;
+
+            let aditional = {
+                let mut x = state.exclude(world.get_packages());
+                x.ignore = world.get_packages().ignore.clone();
+                x.official.extend(get_unneeded_packages()?);
+                x.exclude_ignored();
+                x.get_package_list()
+            };
+
+            if aditional.is_empty() {
+                if !args.quiet {
+                    println!("No packages to remove.");
+                }
+                return Ok(());
+            }
+
+            remove_packages(&aditional, all)?;
+        }
     }
     Ok(())
 }

src/package_manager.rs

@@ -1,4 +1,4 @@
-use crate::{error::Result, world::Packages};
+use crate::{PRIVLAGE_ESCELATE_COMMAND, error::Result, world::Packages};
 use std::process::{Command, Stdio};
 
 pub fn get_system_state() -> Result<Packages> {
@@ -28,3 +28,37 @@ pub fn get_system_state() -> Result<Packages> {
         ignore: Vec::new(),
     })
 }
+
+pub fn get_unneeded_packages() -> Result<Vec<String>> {
+    let command = Command::new("pacman")
+        .arg("-Qqdt")
+        .stdout(Stdio::piped())
+        .output()?;
+
+    let packages: Vec<String> = String::from_utf8(command.stdout)?
+        .split_whitespace()
+        .map(|x| x.to_owned())
+        .collect();
+
+    Ok(packages)
+}
+
+pub fn remove_packages(packages: &[String], all: bool) -> Result<()> {
+    let mut command = Command::new(PRIVLAGE_ESCELATE_COMMAND);
+    command.arg("pacman");
+
+    if all {
+        command.arg("-Rns");
+    } else {
+        command.arg("-Rs");
+    }
+
+    command
+        .args(packages)
+        .stdin(Stdio::inherit())
+        .stdout(Stdio::inherit())
+        .stderr(Stdio::inherit())
+        .status()?;
+
+    Ok(())
+}

src/world.rs

@@ -1,7 +1,5 @@
 use std::env;
-use std::error::Error;
+use std::io::Read;
-use std::fs::OpenOptions;
-use std::io::{Read, Write};
 use std::{fs::File, path::PathBuf};
 
 use serde::{Deserialize, Serialize};
@@ -36,9 +34,7 @@ impl Packages {
             ignore: Vec::new(),
         }
     }
-}
 
-impl Packages {
     pub fn exclude(&self, other: &Self) -> Self {
         let official = self
             .official
@@ -64,6 +60,13 @@ impl Packages {
         self.official.retain(|x| !self.ignore.contains(x));
         self.foreign.retain(|x| !self.ignore.contains(x));
     }
+
+    pub fn get_package_list(&self) -> Vec<String> {
+        let mut packages_list = self.official.clone();
+        packages_list.extend(self.foreign.clone());
+
+        packages_list
+    }
 }
 
 impl World {