src/utils/volume.rs


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use crate::types::Config;
use alsa::mixer::{Mixer, SelemChannelId, SelemId};

// getting volume percentage
pub fn get_volume(config: &Config) -> String {
    let card = if config.volume.card == "PULSE" {
        "pulse"
    } else {
        "default"
    };

    let mixer = Mixer::new(card, false).expect("Failed to open mixer");
    let selem_id = SelemId::new("Master", 0);
    let selem = mixer.find_selem(&selem_id).expect("Couldn't find selem");
    let selem_chan_id = SelemChannelId::FrontLeft;

    let (min, max) = selem.get_playback_volume_range();
    let mut raw_volume = selem
        .get_playback_volume(selem_chan_id)
        .expect("Failed to get raw_volume");

    let range = max - min;
    let vol = if range == 0 {
        0
    } else {
        raw_volume -= min;
        ((raw_volume as f64 / range as f64) * 100.) as u64
    };

    format!("  {}  {}%  {}", config.volume.icon, vol, config.seperator)
}