AddCompareHash.ps1

# Get the user's profile path
$profilePath = $PROFILE.CurrentUserCurrentHost

# Check if the profile exists
if (-not (Test-Path -Path $profilePath -PathType Leaf)) {
    # Create the profile directory if it doesn't exist
    $profileDirectory = Split-Path -Path $profilePath
    if (-not (Test-Path -Path $profileDirectory -PathType Container)) {
        New-Item -Path $profileDirectory -ItemType Directory -Force
    }

    # Create the profile file
    New-Item -Path $profilePath -ItemType File
}

# Function code
$functionCode = @"
function CompareHash {
    param (
        [string]`$FilePath,
        [string]`$ExpectedHash,
        [string]`$HashType
    )

    `$HashTypes = @("md5", "sha1", "sha256", "sha512")

    # Check for help flag
    if (`$FilePath -eq "-h" -or `$FilePath -eq "--help" -or `$FilePath -eq "-help") {
        Write-Host "Compares two hash values and returns true if they are equal"
        Write-Host "  Usage: CompareHash /path/to/file expectedHash hashType"
        Write-Host "  Acceptable hash types: md5, sha1, sha256, sha512"
        Write-Host "  Example: CompareHash ~\`$Downloads\msys2-x86_64-20231026.exe 5702372d25111e24d59596de62ae24daef873018cbf63c9dd9ff12292a57aca9 sha256"
        return
    }

    if (-not `$FilePath) {
        Write-Host "Please provide a file path.\`nEx: CompareHash /path/to/file expectedHash hashType"
        return
    }

    if (-not `$ExpectedHash) {
        Write-Host "Please provide the expected hash value.\`nEx: CompareHash /path/to/file expectedHash hashType"
        return
    }

    if (-not `$HashType) {
        Write-Host "Please provide a hash type.\`nEx: CompareHash /path/to/file expectedHash hashType"
        return
    }

    if (-not (Test-Path -Path `$FilePath -PathType Leaf)) {
        Write-Host "File not found. Please provide the absolute file path."
        return
    }

    if (-not `$HashTypes.Contains(`$HashType)) {
        Write-Host "Please provide a valid hash type.\`nAcceptable hash types: md5, sha1, sha256, sha512"
        return
    }

    # Compute the hash using Get-FileHash
    `$computedHash = (Get-FileHash -Path `$FilePath -Algorithm `$HashType).Hash

    # Compare the computed hash with the expected hash
    `$result = `$computedHash.ToLower() -eq `$ExpectedHash.ToLower()

    # Output "True" or "False"
    Write-Host `$result
}
"@

# Check if the function already exists in the profile
if (-not (Get-Content $profilePath | Select-String -Pattern "function CompareHash")) {
    # Write the function code to the profile file
    Add-Content -Path $profilePath -Value $functionCode
    Write-Host "Function added to the profile successfully."
}
else {
    Write-Host "Function already exists in the profile."
}