feat(aura): add -Oe to see top-level packages

`-O` has always displayed "orphan packages", but there was no way to see
which packages were marked as "unrequired" yet installed explicitly.
Something of an opposite concept to orphans.

You'd assume that all such packages would be applications (given that
they aren't listed as being depended on), but sometimes installed
packages get forgotten or are somehow mislabelled. These are "elderly"
packages and should be uninstalled to avoid pointless updates.

rust/CHANGELOG.md

@@ -24,6 +24,8 @@ Tarball Size       : 72.09MiB
 Available Versions : 5.8.13.arch1-1, 5.8.10.arch1-1
 ```
 
+- `-Oe` to display explicitly installed, top-level (i.e. unrequired) packages.
+  Useful for detecting packages that you no longer need installed.
 - `deps` command for analyzing dependency connections. Generates output in
   [Graphviz DOT format](https://en.wikipedia.org/wiki/DOT_%28graph_description_language%29),
   and can be used like so:

rust/aura-pm/src/command/orphans.rs

@@ -55,6 +55,13 @@ pub(crate) fn list(alpm: &Alpm) {
     aura_core::orphans(alpm).for_each(|o| println!("{} {}", o.name(), o.version()))
 }
 
+/// Print the name of each "elderly" package. In theory these are all explicitly
+/// installed applications, but occasionally packages are installed by mistake
+/// or forgotten. We want to identify such packages for removal.
+pub(crate) fn elderly(alpm: &Alpm) {
+    aura_core::elderly(alpm).for_each(|o| println!("{} {}", o.name(), o.version()))
+}
+
 /// Sets a package's install reason to "as explicit". An alias for `-D --asexplicit`.
 pub(crate) fn adopt(
     alpm: &Alpm,

rust/aura-pm/src/error.rs

@@ -12,7 +12,7 @@ pub(crate) enum Error {
     A(crate::command::aur::Error),
     B(crate::command::snapshot::Error),
     C(crate::command::cache::Error),
-    L(crate::log::Error),
+    L(crate::command::log::Error),
     O(crate::command::orphans::Error),
     Dirs(crate::dirs::Error),
     /// A non-zero exit code was returned from a call to Pacman.

rust/aura-pm/src/flags.rs

@@ -790,6 +790,9 @@ pub struct Orphans {
     /// Uninstall all orphan packages.
     #[clap(group = "orphans", long, short = 'j')]
     pub abandon: bool,
+    /// Display all explicitly installed, top-level packages.
+    #[clap(group = "orphans", long, short = 'e')]
+    pub elderly: bool,
 }
 
 /// View various configuration settings and files.

rust/aura-pm/src/main.rs

@@ -1,6 +1,6 @@
 //! The Aura Package Manager.
 //!
-//! Copyright 2012 - 2022 Colin Woodbury <[email protected]>
+//! Copyright 2012 - 2023 Colin Woodbury <[email protected]>
 //!
 //! This file is part of Aura.
 //!
@@ -40,14 +40,14 @@ mod macros;
 pub(crate) mod pacman;
 pub(crate) mod utils;
 
-use crate::command::{aur, cache, check, conf, deps, log, open, orphans, snapshot, stats};
+use crate::command::{aur, cache, check, conf, deps, log as llog, open, orphans, snapshot, stats};
 use crate::error::{Error, Nested};
 use crate::localization::Localised;
-use ::log::debug;
 use aura_pm::flags::{Args, Cache, SubCmd, AURA_GLOBALS};
 use clap::Parser;
 use colored::Colorize;
 use i18n_embed::fluent::FluentLanguageLoader;
+use log::debug;
 use simplelog::{ColorChoice, Config, TermLogger, TerminalMode};
 use std::ops::Not;
 use std::process::ExitCode;
@@ -137,12 +137,13 @@ fn work(args: Args, fll: &FluentLanguageLoader) -> Result<(), Error> {
         SubCmd::Cache(c) if c.missing => cache::missing(&env.alpm()?, &env.caches()),
         SubCmd::Cache(c) => cache::downgrade(fll, &env.caches(), c.packages)?,
         // --- Logs --- //
-        SubCmd::Log(l) if l.search.is_some() => log::search(env.alpm_log(), l.search.unwrap())?,
-        SubCmd::Log(l) if !l.info.is_empty() => log::info(fll, env.alpm_log(), l.info)?,
-        SubCmd::Log(l) => log::view(env.alpm_log(), l.before, l.after)?,
+        SubCmd::Log(l) if l.search.is_some() => llog::search(env.alpm_log(), l.search.unwrap())?,
+        SubCmd::Log(l) if !l.info.is_empty() => llog::info(fll, env.alpm_log(), l.info)?,
+        SubCmd::Log(l) => llog::view(env.alpm_log(), l.before, l.after)?,
         // --- Orphan Packages --- //
         SubCmd::Orphans(o) if o.abandon => orphans::remove(&mut env.alpm()?, fll)?,
         SubCmd::Orphans(o) if !o.adopt.is_empty() => orphans::adopt(&env.alpm()?, fll, o.adopt)?,
+        SubCmd::Orphans(o) if o.elderly => orphans::elderly(&env.alpm()?),
         SubCmd::Orphans(_) => orphans::list(&env.alpm()?),
         // --- PKGBUILD Analysis --- //
         // SubCmd::Analysis(_) => unimplemented!(),