Port compat tool (#50)

* add method to query configured compatibility tool

* Update things to better match new structure

---------

Co-authored-by: Jan200101 <[email protected]>

src/config.rs

@@ -0,0 +1,41 @@
+use serde::Deserialize;
+use std::collections::HashMap;
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+pub(crate) struct Store {
+    pub(crate) software: Software,
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+pub(crate) struct Software {
+    pub(crate) valve: Valve,
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "PascalCase")]
+pub(crate) struct Valve {
+    pub(crate) steam: Steam,
+}
+
+#[derive(Deserialize, Debug)]
+pub(crate) struct Steam {
+    #[serde(rename = "CompatToolMapping")]
+    pub(crate) mapping: HashMap<u32, CompatTool>,
+}
+
+/// An instance of a compatibility tool.
+#[derive(Deserialize, Debug, Clone)]
+pub struct CompatTool {
+    /// The name of the tool.
+    ///
+    /// Example: `proton_411`
+    pub name: Option<String>,
+
+    // Unknown option, may be used in the future
+    pub config: Option<String>,
+
+    // Unknown option, may be used in the future
+    pub priority: Option<u64>,
+}

src/error.rs

@@ -77,6 +77,7 @@ impl Error {
 #[derive(Copy, Clone, Debug)]
 #[non_exhaustive]
 pub enum ParseErrorKind {
+    Config,
     LibraryFolders,
     App,
     Shortcut,

src/lib.rs

@@ -121,6 +121,7 @@
 )]
 
 pub mod app;
+pub mod config;
 pub mod error;
 pub mod library;
 #[cfg(feature = "locate")]
@@ -129,9 +130,14 @@ pub mod shortcut;
 #[cfg(any(test, doctest))]
 pub mod tests;
 
+use std::collections::HashMap;
+use std::fs;
 use std::path::{Path, PathBuf};
 
+use crate::error::{ParseError, ParseErrorKind};
+
 pub use crate::app::App;
+pub use crate::config::CompatTool;
 pub use crate::error::{Error, Result};
 pub use crate::library::Library;
 pub use crate::shortcut::Shortcut;
@@ -204,6 +210,21 @@ impl InstallDir {
         }
     }
 
+    pub fn compat_tool_mapping(&self) -> Result<HashMap<u32, CompatTool>> {
+        let config_path = self.path.join("config").join("config.vdf");
+        let vdf_text =
+            fs::read_to_string(&config_path).map_err(|io| Error::io(io, &config_path))?;
+        let store: config::Store = keyvalues_serde::from_str(&vdf_text).map_err(|de| {
+            Error::parse(
+                ParseErrorKind::Config,
+                ParseError::from_serde(de),
+                &config_path,
+            )
+        })?;
+
+        Ok(store.software.valve.steam.mapping)
+    }
+
     /// Returns a listing of all added non-Steam games
     pub fn shortcuts(&mut self) -> Result<shortcut::Iter> {
         shortcut::Iter::new(&self.path)