Initial commit

src/egs/get_manifests.rs

@@ -0,0 +1,47 @@
+use std::env::{self, VarError};
+use std::fs::{DirEntry, File};
+use std::io::BufReader;
+use std::path::Path;
+use std::error::Error;
+use super::ManifestItem;
+
+pub fn get_egs_manifests()  -> Result<Vec<ManifestItem>, Box<dyn Error>> {
+    let manifest_dir_path = get_manifest_dir_path()?;
+    let manifest_dir_result = std::fs::read_dir(&manifest_dir_path);
+    if let Err(err) = manifest_dir_result {
+        //TODO make a new error type here instead
+        println!("Could not find manifest directory: {}", manifest_dir_path);
+        return Result::Err(Box::new(err));
+    }
+    let manifest_dir = manifest_dir_result?;
+    let manifests = manifest_dir        
+        .filter_map(|dir| dir.ok())
+        .filter_map(get_manifest_item)
+        .filter(is_game_installed);
+    Ok(manifests.collect())
+}
+
+fn get_manifest_dir_path() -> Result<String, VarError> {
+    let key = "SYSTEMDRIVE";
+    let system_drive = env::var(key)?;
+    Ok(format!(
+        "{system_drive}//ProgramData//Epic//EpicGamesLauncher//Data//Manifests",
+        system_drive = system_drive
+    ))
+}
+
+ fn is_game_installed(manifest:&ManifestItem) -> bool{
+    Path::new(manifest.manifest_location.as_str()).exists()        
+}
+
+ fn get_manifest_item(dir_entry: DirEntry) -> Option<ManifestItem> {
+    if let Some(extension) = dir_entry.path().extension() {
+        if extension.eq("item") {
+            if let Ok(file) = File::open(dir_entry.path()) {
+                let reader = BufReader::new(file);
+                return serde_json::from_reader(reader).ok();
+            }
+        }
+    }
+    None
+}

src/egs/manifest_item.rs

@@ -0,0 +1,20 @@
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct ManifestItem {
+    #[serde(alias = "LaunchExecutable")]
+    pub launch_executable: String,
+
+    #[serde(alias = "ManifestLocation")]
+    pub manifest_location: String,
+
+    #[serde(alias = "DisplayName")]
+    pub display_name: String,
+
+    #[serde(alias = "InstallLocation")]
+    pub install_location: String,
+
+    #[serde(alias = "AppName")]
+    pub app_name: String,
+}

src/egs/mod.rs

@@ -0,0 +1,4 @@
+mod get_manifests;
+mod manifest_item;
+pub use manifest_item::*;
+pub use get_manifests::get_egs_manifests;