refactor: Move code for legacy mod install reading to separate file (#416)

Moves some logic related to reading legacy installed mods to new file in order to clean up code before adding new logic.

1 files changed, 112 insertions, 0 deletions

diff --git a/src-tauri/src/mod_management/legacy.rs b/src-tauri/src/mod_management/legacy.rs
new file mode 100644
index 00000000..0f9074d2
--- /dev/null
+++ b/src-tauri/src/mod_management/legacy.rs
@@ -0,0 +1,112 @@
+use crate::GameInstall;
+use crate::NorthstarMod;
+use anyhow::{anyhow, Result};
+use serde::{Deserialize, Serialize};
+use std::{io::Read, path::PathBuf};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct ModJson {
+    #[serde(rename = "Name")]
+    name: String,
+    #[serde(rename = "ThunderstoreModString")]
+    thunderstore_mod_string: Option<String>,
+    #[serde(rename = "Version")]
+    version: Option<String>,
+}
+
+/// Parses `manifest.json` for Thunderstore mod string
+fn parse_for_thunderstore_mod_string(nsmod_path: &str) -> Result<String, anyhow::Error> {
+    let manifest_json_path = format!("{}/manifest.json", nsmod_path);
+    let ts_author_txt_path = format!("{}/thunderstore_author.txt", nsmod_path);
+
+    // Check if `manifest.json` exists and parse
+    let data = std::fs::read_to_string(manifest_json_path)?;
+    let thunderstore_manifest: super::ThunderstoreManifest = json5::from_str(&data)?;
+
+    // Check if `thunderstore_author.txt` exists and parse
+    let mut file = std::fs::File::open(ts_author_txt_path)?;
+    let mut thunderstore_author = String::new();
+    file.read_to_string(&mut thunderstore_author)?;
+
+    // Build mod string
+    let thunderstore_mod_string = format!(
+        "{}-{}-{}",
+        thunderstore_author, thunderstore_manifest.name, thunderstore_manifest.version_number
+    );
+
+    Ok(thunderstore_mod_string)
+}
+
+/// Parse `mods` folder for installed mods.
+pub fn parse_installed_mods(
+    game_install: &GameInstall,
+) -> Result<Vec<NorthstarMod>, anyhow::Error> {
+    let ns_mods_folder = format!("{}/R2Northstar/mods/", game_install.game_path);
+
+    let paths = match std::fs::read_dir(ns_mods_folder) {
+        Ok(paths) => paths,
+        Err(_err) => return Err(anyhow!("No mods folder found")),
+    };
+
+    let mut directories: Vec<PathBuf> = Vec::new();
+    let mut mods: Vec<NorthstarMod> = Vec::new();
+
+    // Get list of folders in `mods` directory
+    for path in paths {
+        log::info!("{path:?}");
+        let my_path = path.unwrap().path();
+        log::info!("{my_path:?}");
+
+        let md = std::fs::metadata(my_path.clone()).unwrap();
+        if md.is_dir() {
+            directories.push(my_path);
+        }
+    }
+
+    // Iterate over folders and check if they are Northstar mods
+    for directory in directories {
+        let directory_str = directory.to_str().unwrap().to_string();
+        // Check if mod.json exists
+        let mod_json_path = format!("{}/mod.json", directory_str);
+        if !std::path::Path::new(&mod_json_path).exists() {
+            continue;
+        }
+
+        // Parse mod.json and get mod name
+
+        // Read file into string and parse it
+        let data = std::fs::read_to_string(mod_json_path.clone())?;
+        let parsed_mod_json: ModJson = match json5::from_str(&data) {
+            Ok(parsed_json) => parsed_json,
+            Err(err) => {
+                log::warn!("Failed parsing {} with {}", mod_json_path, err.to_string());
+                continue;
+            }
+        };
+        // Get Thunderstore mod string if it exists
+        let thunderstore_mod_string = match parsed_mod_json.thunderstore_mod_string {
+            // Attempt legacy method for getting Thunderstore string first
+            Some(ts_mod_string) => Some(ts_mod_string),
+            // Legacy method failed
+            None => match parse_for_thunderstore_mod_string(&directory_str) {
+                Ok(thunderstore_mod_string) => Some(thunderstore_mod_string),
+                Err(_err) => None,
+            },
+        };
+        // Get directory path
+        let mod_directory = directory.to_str().unwrap().to_string();
+
+        let ns_mod = NorthstarMod {
+            name: parsed_mod_json.name,
+            version: parsed_mod_json.version,
+            thunderstore_mod_string,
+            enabled: false, // Placeholder
+            directory: mod_directory,
+        };
+
+        mods.push(ns_mod);
+    }
+
+    // Return found mod names
+    Ok(mods)
+}