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fix: preserve PowerShell profile symlinks #111

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fix: preserve PowerShell profile symlinks #111

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38 changes: 34 additions & 4 deletions src/pwsh-install.ps1
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,25 @@ function Remove-FileIfExists([string]$Path) {
}
}

function Get-ProfileWritePath([string]$Path) {
$item = Get-Item -LiteralPath $Path -Force -ErrorAction Ignore
if (!$item -or $item.LinkType -ne 'SymbolicLink') {
return $Path
}

$target = $item.Target
if (!$target) {
return $Path
}
if ($target -is [array]) {
$target = $target[0]
}
if (![System.IO.Path]::IsPathRooted($target)) {
$target = [System.IO.Path]::GetFullPath((Join-Path (Split-Path -LiteralPath $Path) $target))
}
return $target
}

function Get-InjectedSection([string]$CmdDir) {
$templatePath = Join-Path $PSScriptRoot 'pwsh-install-template.ps1'
$template = Get-Content -LiteralPath $templatePath -Raw
Expand All @@ -55,8 +74,14 @@ function Update-PowerShellProfile([string]$Path, [bool] $Install, [bool] $UseBom
return
}

$writePath = Get-ProfileWritePath $Path
$isSymlink = $writePath -ne $Path
if ($Install -and $isSymlink) {
[void](New-Item -Path (Split-Path -LiteralPath $writePath) -ItemType Directory -Force)
}

# Get-Content uses .NET's StreamReader, so it auto-detects UTF-8/UTF-16 with BOM.
$text = Get-Content -LiteralPath $Path -Raw -ErrorAction Ignore
$text = Get-Content -LiteralPath $writePath -Raw -ErrorAction Ignore
if (!$text) {
$text = ''
}
Expand All @@ -83,18 +108,23 @@ function Update-PowerShellProfile([string]$Path, [bool] $Install, [bool] $UseBom
}

if (!$text) {
Remove-FileIfExists $Path
if ($isSymlink) {
[System.IO.File]::WriteAllText($writePath, '', [System.Text.UTF8Encoding]::new($UseBom))
}
else {
Remove-FileIfExists $Path
}
return
}

$text += "`r`n"
$encoding = [System.Text.UTF8Encoding]::new($UseBom)

# Atomic write: stage as .new, then replace.
$newPath = "$Path.new"
$newPath = "$writePath.new"
try {
[System.IO.File]::WriteAllText($newPath, $text, $encoding)
[System.IO.File]::Move($newPath, $Path, $true)
[System.IO.File]::Move($newPath, $writePath, $true)
}
catch {
Remove-Item -LiteralPath $newPath -Force -ErrorAction Ignore
Expand Down