feat: pure subcommand

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(())
+}