generate_version.ps1

<#
.SYNOPSIS
    Generates version_info.h from the current git tag.
    Falls back to 0.0.0 when git is unavailable or no tag is found.
.PARAMETER Output
    Path to write version_info.h (default: version_info.h next to this script).
#>
param(
    [string]$Output  = "$PSScriptRoot\version_info.h",
    [string]$Version = ''   # Optional override (e.g. from CI tag); falls back to git describe.
)

$major = 0; $minor = 0; $patch = 0

$tag = $Version
if (-not $tag) {
    try {
        $tag = & git -C $PSScriptRoot describe --tags --exact-match HEAD 2>$null
        if (-not $tag) {
            $tag = & git -C $PSScriptRoot describe --tags --abbrev=0 2>$null
        }
    } catch {}
}
if ($tag -match '^v?(\d+)\.(\d+)\.(\d+)') {
    $major = [int]$Matches[1]
    $minor = [int]$Matches[2]
    $patch = [int]$Matches[3]
}

$content = @"
#pragma once
// Auto-generated by generate_version.ps1 - do not edit by hand.
#define VER_MAJOR              $major
#define VER_MINOR              $minor
#define VER_PATCH              $patch
#define VER_BUILD              0
#define VER_FILEVERSION        $major,$minor,$patch,0
#define VER_PRODUCTVERSION     $major,$minor,$patch,0
#define VER_FILEVERSION_STR    "$major.$minor.$patch.0"
#define VER_PRODUCTVERSION_STR "$major.$minor.$patch.0"
#define VER_COMPANY_STR        "LANCommander"
#define VER_PRODUCT_STR        "LANCommander Interposer"
#define VER_COPYRIGHT_STR      "Copyright (c) 2024-2026 LANCommander Contributors. MIT License."
"@

# Only write when content differs to avoid spurious rebuilds.
# Use .NET directly for UTF-8 without BOM (compatible with PowerShell 5.x and 7+).
$utf8NoBom = New-Object System.Text.UTF8Encoding $false
$existing = if (Test-Path $Output) { [System.IO.File]::ReadAllText($Output) } else { '' }
$content = $content + "`n"
if ($content -ne $existing) {
    [System.IO.File]::WriteAllText($Output, $content, $utf8NoBom)
    Write-Host "version_info.h: updated to $major.$minor.$patch"
} else {
    Write-Host "version_info.h: up to date ($major.$minor.$patch)"
}