local ps =
    "Get-PSDrive -PSProvider FileSystem | " ..
    "Where-Object { $_.Used -ne $null -or $_.Free -ne $null } | " ..
    "ForEach-Object { '{0}:{1}' -f $_.Name, [math]::Round($_.Free/1GB,0) } | " ..
    "ForEach-Object { Write-Host -NoNewline ($_+' ') }"

local res = jarvis.system.exec(string.format(
    'powershell -NoProfile -Command "%s"', ps:gsub('"', '\\"')
))

if not res.success then
    return jarvis.cmd.error("Не получилось.")
end

local out = (res.stdout or ""):gsub("^%s+", ""):gsub("%s+$", "")
if out == "" then
    return jarvis.cmd.not_found("Дисков не нашёл.")
end

-- "C:120 D:300 E:50" → "C 120 ГБ, D 300 ГБ, ..."
local parts = {}
for letter, gb in out:gmatch("([A-Z]):(%d+)") do
    table.insert(parts, letter .. " " .. gb .. " гигабайт")
end

if #parts == 0 then
    return jarvis.cmd.error("Не понял ответ системы.")
end

return jarvis.cmd.ok("Свободно: " .. table.concat(parts, ", ") .. ".")