Add Install.ps1 and easy install instructions

Install.ps1

@@ -0,0 +1,134 @@
+[CmdletBinding()]
+param(
+    [string]$GameDir
+)
+
+$ErrorActionPreference = 'Stop'
+
+function Write-Step {
+    param([string]$Text)
+    Write-Host ''
+    Write-Host $Text -ForegroundColor Cyan
+}
+
+function Find-GameDir {
+    $steam = (Get-ItemProperty 'HKCU:\Software\Valve\Steam' -ErrorAction SilentlyContinue).SteamPath
+    if (-not $steam) { return $null }
+    $libs = @($steam)
+    $vdf = Join-Path $steam 'steamapps\libraryfolders.vdf'
+    if (Test-Path $vdf) {
+        Select-String -Path $vdf -Pattern '"path"\s+"(.+?)"' -AllMatches |
+            ForEach-Object { $_.Matches } |
+            ForEach-Object { $libs += $_.Groups[1].Value.Replace('\\','\') }
+    }
+    foreach ($lib in $libs) {
+        $candidate = Join-Path $lib 'steamapps\common\Sons Of The Forest'
+        if (Test-Path (Join-Path $candidate 'SonsOfTheForest.exe')) { return $candidate }
+    }
+    return $null
+}
+
+function Get-ReleaseZip {
+    param([string]$Repo, [string]$Pattern, [string]$OutFile)
+    $release = Invoke-RestMethod "https://api.github.com/repos/$Repo/releases/latest" -Headers @{ 'User-Agent' = 'ps' }
+    $asset = $release.assets | Where-Object { $_.name -match $Pattern } | Select-Object -First 1
+    if (-not $asset) { throw "Could not find a download matching $Pattern in the latest $Repo release" }
+    Write-Host "  version $($release.tag_name)"
+    Invoke-WebRequest -Uri $asset.browser_download_url -OutFile $OutFile -UseBasicParsing
+    return $asset.name
+}
+
+try {
+    Write-Host ''
+    Write-Host '====================================' -ForegroundColor Green
+    Write-Host ' FullAuto installer' -ForegroundColor Green
+    Write-Host '====================================' -ForegroundColor Green
+
+    if (Get-Process -Name 'SonsOfTheForest' -ErrorAction SilentlyContinue) {
+        throw 'Sons of the Forest is running. Close the game and run the installer again.'
+    }
+
+    Write-Step 'Looking for Sons of the Forest'
+    if (-not $GameDir) { $GameDir = Find-GameDir }
+    if (-not $GameDir -or -not (Test-Path (Join-Path $GameDir 'SonsOfTheForest.exe'))) {
+        Write-Host '  Could not find the game automatically.' -ForegroundColor Yellow
+        Write-Host '  In Steam, right-click Sons Of The Forest, then Manage, then Browse local files.'
+        Write-Host '  Copy the folder path from the address bar and paste it below.'
+        $GameDir = (Read-Host '  Game folder').Trim('"')
+        if (-not (Test-Path (Join-Path $GameDir 'SonsOfTheForest.exe'))) {
+            throw "SonsOfTheForest.exe was not found in $GameDir"
+        }
+    }
+    Write-Host "  found: $GameDir" -ForegroundColor Green
+
+    $needsFirstLaunch = $false
+
+    Write-Step 'Checking for RedLoader'
+    if (Test-Path (Join-Path $GameDir '_RedLoader\net6\SonsSdk.dll')) {
+        Write-Host '  already installed' -ForegroundColor Green
+    }
+    else {
+        Write-Host '  not installed, downloading it now'
+        $rlZip = Join-Path $env:TEMP 'RedLoader.zip'
+        Get-ReleaseZip -Repo 'ToniMacaroni/RedLoader' -Pattern '^RedLoader.*\.zip$' -OutFile $rlZip | Out-Null
+
+        $rlStage = Join-Path $env:TEMP 'redloader-stage'
+        if (Test-Path $rlStage) { Remove-Item $rlStage -Recurse -Force }
+        Expand-Archive -Path $rlZip -DestinationPath $rlStage -Force
+        Copy-Item -Path (Join-Path $rlStage '*') -Destination $GameDir -Recurse -Force
+        Remove-Item $rlZip -Force -ErrorAction SilentlyContinue
+        Remove-Item $rlStage -Recurse -Force -ErrorAction SilentlyContinue
+        Write-Host '  installed' -ForegroundColor Green
+        $needsFirstLaunch = $true
+    }
+
+    Write-Step 'Downloading FullAuto'
+    $modZip = Join-Path $env:TEMP 'FullAuto.zip'
+    Get-ReleaseZip -Repo 'JustinOros/sotf-fullauto' -Pattern '^FullAuto\.zip$' -OutFile $modZip | Out-Null
+
+    Write-Step 'Installing FullAuto'
+    $modsDir = Join-Path $GameDir 'Mods'
+    New-Item -ItemType Directory -Force -Path $modsDir | Out-Null
+    Remove-Item (Join-Path $modsDir 'FullAuto.dll') -Force -ErrorAction SilentlyContinue
+    Remove-Item (Join-Path $modsDir 'FullAuto') -Recurse -Force -ErrorAction SilentlyContinue
+    Expand-Archive -Path $modZip -DestinationPath $modsDir -Force
+    Remove-Item $modZip -Force -ErrorAction SilentlyContinue
+
+    if (-not (Test-Path (Join-Path $modsDir 'FullAuto.dll'))) {
+        throw 'Something went wrong, FullAuto.dll is not in the Mods folder'
+    }
+    if (-not (Test-Path (Join-Path $modsDir 'FullAuto\manifest.json'))) {
+        throw 'Something went wrong, manifest.json is not in the Mods\FullAuto folder'
+    }
+    Write-Host '  installed' -ForegroundColor Green
+
+    Write-Host ''
+    Write-Host '====================================' -ForegroundColor Green
+    Write-Host ' Done' -ForegroundColor Green
+    Write-Host '====================================' -ForegroundColor Green
+    Write-Host ''
+
+    if ($needsFirstLaunch) {
+        Write-Host 'RedLoader was installed for the first time, so the next time you start'
+        Write-Host 'the game it will take a few extra minutes to get ready. That is normal.'
+        Write-Host ''
+    }
+
+    Write-Host 'Start Sons of the Forest, then:'
+    Write-Host '  1. Check that MODS appears on the main menu and lists FullAuto'
+    Write-Host '  2. Load into a game and equip a pistol, revolver, shotgun or rifle'
+    Write-Host '  3. Hold the fire button to shoot full-auto'
+    Write-Host '  4. Click the middle mouse button to switch between'
+    Write-Host '     Full-automatic, Semi-automatic and 3-Round Burst'
+    Write-Host ''
+}
+catch {
+    Write-Host ''
+    Write-Host "Install failed: $($_.Exception.Message)" -ForegroundColor Red
+    if ($_.Exception.Message -match 'denied') {
+        Write-Host 'Try again from PowerShell opened with Run as administrator.' -ForegroundColor Yellow
+    }
+    Write-Host ''
+}
+
+Read-Host 'Press Enter to close' | Out-Null

README.md

@@ -12,7 +12,20 @@ players do not need the mod.
 
 ## Installation
 
-### Step 1: Install RedLoader
+### Easy install
+
+Close the game, open PowerShell and paste:
+
+```powershell
+irm https://raw.githubusercontent.com/JustinOros/sotf-fullauto/main/Install.ps1 | iex
+```
+
+It finds your game, installs RedLoader if needed, and installs the latest
+FullAuto. Run it again any time to update.
+
+### Manual install
+
+#### Step 1: Install RedLoader
 
 [RedLoader](https://github.com/ToniMacaroni/RedLoader/releases/latest) is the mod
 loader for Sons of the Forest. The game cannot load any mod without it, so
@@ -27,7 +40,7 @@ install it first. You only have to do this once.
    takes a few minutes while RedLoader processes the game files
 4. Check that `MODS` appears on the main menu, then quit
 
-### Step 2: Install FullAuto
+#### Step 2: Install FullAuto
 
 1. Download `FullAuto.zip` from the
    [latest release](https://github.com/JustinOros/sotf-fullauto/releases/latest)