obtain iw4x.dll from iw4x/iw4x-client

src/iw4x.rs

@@ -0,0 +1,40 @@
+use crate::github;
+use crate::http;
+use crate::misc;
+use crate::global::*;
+
+use std::{fs, path::Path};
+
+pub fn local_revision(dir: &Path) -> u16 {
+    if let Ok(revision) = fs::read_to_string(dir.join(".iw4xrevision")) {
+        misc::rev_to_int(&revision)
+    } else {
+        0
+    }
+}
+
+pub fn remote_revision() -> u16 {
+    misc::rev_to_int(&github::latest(GH_IW4X_OWNER, GH_IW4X_REPO))
+}
+
+pub fn update_available(dir: &Path) -> bool {
+    local_revision(dir) < remote_revision()
+}
+
+pub fn update(dir: &Path) {
+    if update_available(dir) {
+        println!("Updating IW4x...");
+        http::download_file(
+            &format!(
+                "{}/download/iw4x.dll",
+                github::latest_release_url(GH_IW4X_OWNER, GH_IW4X_REPO)
+            ),
+            &dir.join("iw4x.dll"),
+        );
+        fs::write(
+            dir.join(".iw4xrevision"),
+            github::latest(GH_IW4X_OWNER, GH_IW4X_REPO),
+        )
+        .unwrap();
+    }
+}