pinnacle/api/lua/process.lua

-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at https://mozilla.org/MPL/2.0/.
--
-- SPDX-License-Identifier: MPL-2.0

local process = {}

---Spawn a process with an optional callback for its stdout and stderr.
---@param command string|string[] The command as one whole string or a table of each of its arguments
---@param callback fun(stdout: string?, stderr: string?, exit_code: integer?, exit_msg: string?)? A callback to do something whenever the process's stdout or stderr print a line. Only one will be non-nil at a time.
function process.spawn(command, callback)
    ---@type integer|nil
    local callback_id = nil

    if callback ~= nil then
        ---@param args Args
        table.insert(CallbackTable, function(args)
            local args = args.Spawn or {} -- don't know if the `or {}` is necessary
            callback(args.stdout, args.stderr, args.exit_code, args.exit_msg)
        end)
        callback_id = #CallbackTable
    end

    local command_arr = {}
    if type(command) == "string" then
        for i in string.gmatch(command, "%S+") do
            table.insert(command_arr, i)
        end
    else
        command_arr = command
    end

    SendMsg({
        Spawn = {
            command = command_arr,
            callback_id = callback_id,
        },
    })
end

return process