【入门夯实】公告文案的多行治理：缩进与换行处理

local notice = [[
        沙巴克攻城今晚八点开启
        全行会成员准时集结
    ]]
sendmsg(nil, 1, notice)

local function cleanLines(text)
    local lines = {}
    for line in string.gmatch(text .. "\n", "([^\r\n]*)[\r\n]") do
        local trimmed = string.gsub(line, "^%s+", "")
        trimmed = string.gsub(trimmed, "%s+$", "")
        if trimmed ~= "" then
            lines[#lines + 1] = trimmed
        end
    end
    return lines
end
local function buildNotice(tpl)
    local lines = cleanLines(tpl)
    return table.concat(lines, "\n")
end

local clean = buildNotice([[
        沙巴克攻城今晚八点开启
        全行会成员准时集结
    ]])
sendmsg(nil, 1, clean)

local function stripCommonIndent(lines)
    local minIndent = math.huge
    for _, l in ipairs(lines) do
        local lead = string.match(l, "^%s*"):len()
        if l:match("[^%s]") and lead < minIndent then
            minIndent = lead
        end
    end
    for i, l in ipairs(lines) do
        lines[i] = l:sub(minIndent + 1)
    end
    return lines
end