# Install oh for this Windows user (oxygenhub#319). Run it from the

# unpacked zip:   powershell -ExecutionPolicy Bypass -File .\install.ps1

#

# - Copies oh.exe and ohub.exe to %LOCALAPPDATA%\Programs\oh and puts that

#   folder on this user's PATH.

# - PowerShell has a built-in alias `oh` (Out-Host) that hides oh.exe. Where

#   PowerShell runs scripts, this removes the alias in your profile; under

#   Windows' default policy (Restricted) a profile cannot run at all, so it

#   leaves that alone and you use `ohub`, which always works. It never

#   changes your execution policy.

# Nothing here needs administrator rights; run it again to update.

$ErrorActionPreference = 'Stop'

$here = Split-Path -Parent $MyInvocation.MyCommand.Path

$dest = Join-Path $env:LOCALAPPDATA 'Programs\oh'

New-Item -ItemType Directory -Force -Path $dest | Out-Null

foreach ($exe in 'oh.exe', 'ohub.exe') {

    Copy-Item -Force (Join-Path $here $exe) (Join-Path $dest $exe)

}

$path = [Environment]::GetEnvironmentVariable('Path', 'User')

$parts = @($path -split ';' | Where-Object { $_ -ne '' })

if ($parts -notcontains $dest) {

    [Environment]::SetEnvironmentVariable('Path', (($parts + $dest) -join ';'), 'User')

    Write-Host "Added $dest to your PATH (new terminals see it)."

}

$marker = '# oh: PowerShell''s alias `oh` (Out-Host) hides oh.exe (oxygenhub#319)'

$line = 'Remove-Item Alias:oh -Force -ErrorAction SilentlyContinue'

$profilePath = $PROFILE.CurrentUserAllHosts

# A profile runs only where scripts may: under Restricted (Windows' default)

# or AllSigned (an unsigned profile) it would print an error in every new

# PowerShell instead, and the alias would stay.

# The policy a new PowerShell gets, not this one's (run with -ExecutionPolicy

# Bypass, this process may run anything): the first scope that sets one,

# else Restricted, the client default.

$policy = 'Restricted'

foreach ($scope in 'MachinePolicy', 'UserPolicy', 'CurrentUser', 'LocalMachine') {

    $p = Get-ExecutionPolicy -Scope $scope

    if ("$p" -ne 'Undefined') { $policy = "$p"; break }

}

if ($policy -in 'RemoteSigned', 'Unrestricted', 'Bypass') {

    if (-not (Test-Path $profilePath)) {

        New-Item -ItemType File -Force -Path $profilePath | Out-Null

    }

    if (-not (Select-String -Path $profilePath -SimpleMatch -Quiet -Pattern $line)) {

        Add-Content -Path $profilePath -Value "`r`n$marker`r`n$line"

        Write-Host "Your PowerShell profile ($profilePath) now removes the oh alias."

    }

    Remove-Item Alias:oh -Force -ErrorAction SilentlyContinue

    Write-Host "oh is installed: open a new terminal and run 'oh --version' (or 'ohub --version')."

} else {

    Write-Host "oh is installed: open a new terminal and run 'ohub --version'."

    Write-Host "PowerShell runs no scripts here (execution policy $policy), so its alias 'oh' (Out-Host) stays: use 'ohub', or 'oh.exe'. Command Prompt runs 'oh' as it is."

}