Add support for configuration via env variables

src/main.rs

@@ -45,7 +45,12 @@ fn init_indicator(icon_pack: &IconPack) -> AppIndicator {
 fn main() {
     gtk::init().unwrap();
 
-    let mut icon_pack = IconPack::new("./res", "parrot", PackVariant::Dark).unwrap();
+    let res_dir = std::env::var("PARROTD_RESOURCE_DIR").unwrap_or("./res".to_owned());
+    let pack_name = std::env::var("PARROTD_ICON_PACK").unwrap_or("parrot".to_owned());
+    let variant = PackVariant::parse(
+        &std::env::var("PARROTD_VARIANT").unwrap_or("dark".to_owned())).expect("Invalid variant name");
+
+    let mut icon_pack = IconPack::new(res_dir, &pack_name, variant).unwrap();
     let mut indicator = init_indicator(&icon_pack);
 
     // Animation task

src/pack.rs

@@ -2,6 +2,7 @@ use crate::*;
 use std::path::{Path, PathBuf};
 
 #[allow(dead_code)]
+#[derive(Debug)]
 pub enum PackVariant {
     Light,
     Dark,
@@ -14,6 +15,14 @@ impl PackVariant {
             PackVariant::Dark => "dark",
         }
     }
+
+    pub fn parse(s: &str) -> Option<PackVariant> {
+        match s {
+            "light" => Some(PackVariant::Light),
+            "dark" => Some(PackVariant::Dark),
+            _ => None
+        }
+    }
 }
 
 #[allow(unused)]