103 lines
2.7 KiB
Lua
103 lines
2.7 KiB
Lua
local M = {}
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---@param exe_modifier nil|string
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---@param num integer
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---@return string
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local function perm_to_str(exe_modifier, num)
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local str = (bit.band(num, 4) ~= 0 and "r" or "-") .. (bit.band(num, 2) ~= 0 and "w" or "-")
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if exe_modifier then
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if bit.band(num, 1) ~= 0 then
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return str .. exe_modifier
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else
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return str .. exe_modifier:upper()
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end
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else
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return str .. (bit.band(num, 1) ~= 0 and "x" or "-")
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end
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end
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---@param mode integer
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---@return string
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M.mode_to_str = function(mode)
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local extra = bit.rshift(mode, 9)
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return perm_to_str(bit.band(extra, 4) ~= 0 and "s", bit.rshift(mode, 6))
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.. perm_to_str(bit.band(extra, 2) ~= 0 and "s", bit.rshift(mode, 3))
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.. perm_to_str(bit.band(extra, 1) ~= 0 and "t", mode)
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end
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---@param mode integer
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---@return string
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M.mode_to_octal_str = function(mode)
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local mask = 7
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return tostring(bit.band(mask, bit.rshift(mode, 9)))
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.. tostring(bit.band(mask, bit.rshift(mode, 6)))
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.. tostring(bit.band(mask, bit.rshift(mode, 3)))
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.. tostring(bit.band(mask, mode))
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end
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---@param str string String of 3 characters
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---@return integer
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local function str_to_mode(str)
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local r, w, x = unpack(vim.split(str, ""))
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local mode = 0
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if r == "r" then
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mode = bit.bor(mode, 4)
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elseif r ~= "-" then
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return nil
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end
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if w == "w" then
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mode = bit.bor(mode, 2)
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elseif w ~= "-" then
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return nil
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end
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-- t means sticky and executable
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-- T means sticky, not executable
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-- s means setuid/setgid and executable
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-- S means setuid/setgid and not executable
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if x == "x" or x == "t" or x == "s" then
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mode = bit.bor(mode, 1)
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elseif x ~= "-" and x ~= "T" and x ~= "S" then
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return nil
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end
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return mode
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end
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---@param perm string
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---@return integer
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local function parse_extra_bits(perm)
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perm = perm:lower()
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local mode = 0
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if perm:sub(3, 3) == "s" then
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mode = bit.bor(mode, 4)
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end
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if perm:sub(6, 6) == "s" then
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mode = bit.bor(mode, 2)
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end
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if perm:sub(9, 9) == "t" then
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mode = bit.bor(mode, 1)
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end
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return mode
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end
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---@param line string
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---@return nil|integer
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---@return nil|string
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M.parse = function(line)
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local strval, rem = line:match("^([r%-][w%-][xsS%-][r%-][w%-][xsS%-][r%-][w%-][xtT%-])%s*(.*)$")
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if not strval then
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return
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end
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local user_mode = str_to_mode(strval:sub(1, 3))
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local group_mode = str_to_mode(strval:sub(4, 6))
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local any_mode = str_to_mode(strval:sub(7, 9))
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local extra = parse_extra_bits(strval)
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if not user_mode or not group_mode or not any_mode then
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return
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end
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local mode = bit.bor(bit.lshift(user_mode, 6), bit.lshift(group_mode, 3))
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mode = bit.bor(mode, any_mode)
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mode = bit.bor(mode, bit.lshift(extra, 9))
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return mode, rem
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end
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return M
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