From dd403cb0eb17ad84a97a480a563d42db631df1a4 Mon Sep 17 00:00:00 2001
From: Tim Sarbin <tim.sarbin@gmail.com>
Date: Wed, 30 Oct 2019 01:09:39 -0400
Subject: [PATCH] Automatically use wine prefix base path with default config
 on linux

---
 Core/Engine.go | 21 ++++++++++++++++++---
 go.mod         |  1 +
 go.sum         |  2 ++
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/Core/Engine.go b/Core/Engine.go
index c413d38f..03b434b9 100644
--- a/Core/Engine.go
+++ b/Core/Engine.go
@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 	"log"
 	"math"
+	"os"
 	"path"
 	"strings"
 	"sync"
@@ -19,6 +20,7 @@ import (
 	"github.com/essial/OpenDiablo2/UI"
 
 	"github.com/hajimehoshi/ebiten"
+	"github.com/mitchellh/go-homedir"
 )
 
 // EngineConfig defines the configuration for the engine, loaded from config.json
@@ -36,7 +38,7 @@ type EngineConfig struct {
 
 // Engine is the core OpenDiablo2 engine
 type Engine struct {
-	Settings        EngineConfig                        // Engine configuration settings from json file
+	Settings        *EngineConfig                        // Engine configuration settings from json file
 	Files           map[string]string                   // Map that defines which files are in which MPQs
 	Palettes        map[Palettes.Palette]Common.Palette // Color palettes
 	SoundEntries    map[string]Sound.SoundEntry         // Sound configurations
@@ -74,7 +76,7 @@ func CreateEngine() *Engine {
 }
 
 func (v *Engine) loadConfigurationFile() {
-	log.Println("loading configuration file")
+	log.Println("Loading configuration file")
 	configJSON, err := ioutil.ReadFile("config.json")
 	if err != nil {
 		log.Fatal(err)
@@ -85,7 +87,20 @@ func (v *Engine) loadConfigurationFile() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	v.Settings = config
+	v.Settings = &config
+	// Path fixup for wine-installed diablo 2 in linux
+	if v.Settings.MpqPath[0] != '/' {
+		if _, err := os.Stat(v.Settings.MpqPath); os.IsNotExist(err) {
+			homeDir, _ := homedir.Dir()
+			newPath := strings.ReplaceAll(v.Settings.MpqPath, `C:\`, homeDir + "/.wine/drive_c/")
+			newPath = strings.ReplaceAll(newPath, "C:/", homeDir + "/.wine/drive_c/")
+			newPath = strings.ReplaceAll(newPath, `\`, "/")
+			if _, err := os.Stat(newPath); !os.IsNotExist(err) {
+				log.Printf("Detected linux wine installation, path updated to wine prefix path.")
+				v.Settings.MpqPath = newPath
+			}
+		}
+	}
 }
 
 func (v *Engine) mapMpqFiles() {
diff --git a/go.mod b/go.mod
index 14c0c451..bc98d89b 100644
--- a/go.mod
+++ b/go.mod
@@ -5,4 +5,5 @@ go 1.13
 require (
 	github.com/JoshVarga/blast v0.0.0-20180421040937-681c804fb9f0
 	github.com/hajimehoshi/ebiten v1.9.3
+	github.com/mitchellh/go-homedir v1.1.0
 )
diff --git a/go.sum b/go.sum
index aa290cf7..66fbac91 100644
--- a/go.sum
+++ b/go.sum
@@ -24,6 +24,8 @@ github.com/jfreymuth/vorbis v1.0.0/go.mod h1:8zy3lUAm9K/rJJk223RKy6vjCZTWC61NA2Q
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
+github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 golang.org/x/exp v0.0.0-20180710024300-14dda7b62fcd h1:nLIcFw7GiqKXUS7HiChg6OAYWgASB2H97dZKd1GhDSs=
 golang.org/x/exp v0.0.0-20180710024300-14dda7b62fcd/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=