openlogi-cli 0.5.1

//! `openlogi diag lighting <RRGGBB>` — set a wired RGB keyboard to a solid
//! colour via HID++ `PerKeyLighting` (0x8080).
//!
//! Targets the first online direct-attached (USB) Logitech device — i.e. a
//! wired G-series keyboard — by VID/PID, so it isn't tied to one model.

use anyhow::{Result, anyhow};
use clap::Args;
use openlogi_hid::DeviceRoute;

#[derive(Debug, Args)]
pub struct LightingArgs {
    /// Colour as `RRGGBB` hex (e.g. `ff0000` for red).
    pub color: String,
}

pub async fn run(args: LightingArgs) -> Result<()> {
    let hex = args.color.trim_start_matches('#');
    if hex.len() != 6 || !hex.bytes().all(|b| b.is_ascii_hexdigit()) {
        return Err(anyhow!("color must be exactly 6 hex digits, e.g. ff0000"));
    }
    let rgb = u32::from_str_radix(hex, 16)
        .map_err(|_| anyhow!("color must be 6 hex digits, e.g. ff0000"))?;
    let r = ((rgb >> 16) & 0xff) as u8;
    let g = ((rgb >> 8) & 0xff) as u8;
    let b = (rgb & 0xff) as u8;

    let inventories = openlogi_hid::enumerate().await?;
    let (route, name) = inventories
        .iter()
        .find_map(|inv| {
            // Direct (USB-wired) devices carry no receiver UID — that's the
            // wired keyboard. Bolt/Unifying receivers (mice) are skipped.
            if inv.receiver.unique_id.is_some() {
                return None;
            }
            let paired = inv.paired.iter().find(|p| p.online)?;
            let route = DeviceRoute::Direct {
                vendor_id: inv.receiver.vendor_id,
                product_id: inv.receiver.product_id,
            };
            let name = paired.codename.clone().unwrap_or_else(|| {
                format!(
                    "{:04x}:{:04x}",
                    inv.receiver.vendor_id, inv.receiver.product_id
                )
            });
            Some((route, name))
        })
        .ok_or_else(|| {
            anyhow!("no wired (direct-USB) Logitech device found — is the keyboard plugged in?")
        })?;

    println!("setting {name} ({route}) to #{r:02x}{g:02x}{b:02x}");
    openlogi_hid::set_keyboard_color(&route, r, g, b).await?;
    println!("done — {name} should now be solid #{r:02x}{g:02x}{b:02x}");
    Ok(())
}