feat(src/commands): add inhibit command to block sleep using systemd-inhibit

This command prevents system sleep while optionally executing a user‑provided command, offering both foreground and background inhibition modes.

- New Features
  - Implemented inhibit.rs with logic to invoke systemd-inhibit.
  - Exposed inhibit functionality by adding pub mod inhibit; to src/commands/mod.rs.

- Enhancements
  - (none)

- Bug Fixes
  - (none)

src/commands/inhibit.rs

@@ -0,0 +1,54 @@
+use log::{error, info};
+use std::process::Command;
+
+pub fn execute(command_args: &[String], why: &str, who: &str, daemon: bool) {
+    let mut args = vec![
+        "--why".to_string(),
+        why.to_string(),
+        "--who".to_string(),
+        who.to_string(),
+        "--what".to_string(),
+        "sleep:idle".to_string(),
+    ];
+
+    if command_args.is_empty() {
+        if !daemon {
+            info!("No command provided. Inhibiting sleep indefinitely. Press Ctrl+C to stop.");
+        }
+        args.push("sleep".to_string());
+        args.push("infinity".to_string());
+    } else {
+        info!(
+            "Running command while inhibiting sleep: {}",
+            command_args.join(" ")
+        );
+        args.extend(command_args.iter().cloned());
+    }
+
+    if daemon {
+        match Command::new("systemd-inhibit").args(&args).spawn() {
+            Ok(child) => {
+                info!("Inhibitor started in background with PID: {}", child.id());
+                info!("To stop it, use: pkill -P {} systemd-inhibit", child.id());
+                // In background mode, we just let the child run and exit lapctl
+            }
+            Err(e) => {
+                error!("Failed to spawn systemd-inhibit: {}", e);
+            }
+        }
+    } else {
+        match Command::new("systemd-inhibit").args(&args).status() {
+            Ok(status) => {
+                if !status.success() {
+                    error!("systemd-inhibit exited with status: {}", status);
+                }
+            }
+            Err(e) => {
+                error!("Failed to execute systemd-inhibit: {}", e);
+                eprintln!(
+                    "Error: make sure 'systemd-inhibit' is installed and available in your PATH."
+                );
+            }
+        }
+    }
+}

src/commands/mod.rs

@@ -1,6 +1,7 @@
 pub mod battery;
 pub mod cooling;
 pub mod gpu;
+pub mod inhibit;
 pub mod install_rules;
 pub mod power;
 pub mod status;