feat(weidu): Auto detect weidu bin

Signed-off-by: dark0dave <dark0dave@mykolab.com>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mod_installer"
-version = "9.0.2"
+version = "9.1.0"
 edition = "2021"
 authors = [ "dark0dave" ]
 documentation = "https://raw.githubusercontent.com/dark0dave/mod_installer/main/README.md"

README.md

@@ -43,10 +43,22 @@ Let's break down what each part means:
 
 * --game-directory <GAME_DIRECTORY>: This is where you tell the program where your game is installed.
 
-* --weidu-binary <WEIDU_BINARY>: This is where you tell the program where to find the WeiDU program (WeiDU is a tool used to install mods).
+* --weidu-binary <WEIDU_BINARY>: This is where you tell the program where to find the WeiDU program (WeiDU is a tool used to install mods). This binary can be auto detected (alpha feature).
 
 * --mod-directories <MOD_DIRECTORIES>: This is where you tell the program where to find the mod files.
 
+### Example Run
+
+With binary or installed from cargo
+```sh
+mod_installer(.exe) --log-file dark0dave_weidu.log --game-directory ~/.steam/steam/steamapps/common/Baldur\'s\ Gate\ Enhanced\ Edition/ --mod-directories ~/Downloads/my_mods/
+```
+
+With cargo:
+```sh
+cargo run -- --log-file dark0dave_weidu.log --game-directory ~/.steam/steam/steamapps/common/Baldur\'s\ Gate\ Enhanced\ Edition/ --mod-directories ~/Downloads/my_mods/
+```
+
 ## FAQ
 
 The Infinity Engine Mod Installer looks at a "weidu.log" file that you provide. This file contains information about mods you want to install. The tool then goes through this list and installs each mod automatically. This saves you time and effort, as you don't have to manually install each mod one by one.

src/args.rs

@@ -1,3 +1,4 @@
+use std::env::{split_paths, var_os};
 use std::path::PathBuf;
 
 use clap::{builder::BoolishValueParser, Parser};
@@ -12,6 +13,12 @@ Please provide a valid weidu logging setting, options are:
 --weidu-log-mode log-extern  also log output from commands invoked by WeiDU
 ";
 
+#[cfg(not(target_os = "windows"))]
+pub(crate) const WEIDU_FILE_NAME: &str = "weidu";
+#[cfg(target_os = "windows")]
+pub(crate) const WEIDU_FILE_NAME: &str = "weidu.exe";
+
+// https://docs.rs/clap/latest/clap/_derive/index.html#arg-attributes
 #[derive(Parser, Debug, PartialEq)]
 #[clap(author, version, about, long_about = None)]
 pub struct Args {
@@ -24,7 +31,14 @@ pub struct Args {
     pub game_directory: PathBuf,
 
     /// Absolute Path to weidu binary
-    #[clap(env, short, long, value_parser = parse_absolute_path, required = true)]
+    #[clap(
+        env,
+        short,
+        long,
+        value_parser = parse_absolute_path,
+        default_missing_value = WEIDU_FILE_NAME,
+        required = weidu_bin_on_path()
+    )]
     pub weidu_binary: PathBuf,
 
     /// Path to mod directories
@@ -128,6 +142,18 @@ fn parse_absolute_path(arg: &str) -> Result<PathBuf, String> {
     }
 }
 
+fn weidu_bin_on_path() -> bool {
+    if let Some(paths) = var_os("PATH") {
+        for path in split_paths(&paths) {
+            let full_path = path.join(WEIDU_FILE_NAME);
+            if full_path.is_file() {
+                return true;
+            }
+        }
+    }
+    false
+}
+
 #[cfg(test)]
 mod tests {