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local sys = require 'lx.sys'
local sysdef = require 'lx.sysdef'
local _cwd = 'root:/'
function pathcat(path1, path2)
assert(path1, "invalid argument")
if not path2 then
return path1
end
function explode_path(path)
local _, _, dr, p = string.find(path, '^(%w+):(.*)$')
if not dr or not p then
dr, p = nil, path
end
local pp = string.split(p, '/')
if #pp > 1 and pp[#pp] == '' then
table.remove(pp)
end
return dr, pp
end
function implode_path(dr, p)
assert(p[1] == '', 'bad first path component')
return dr .. ':' .. table.concat(p, '/')
end
local dr2, p2 = explode_path(path2)
if dr2 then
return implode_path(dr2, p2)
else
local dr, p1 = explode_path(path1)
assert(p1[1] == '', 'bad path1!')
local p = p1
if p2[1] == '' then
p = {}
end
for _, v in pairs(p2) do
if v == '..' then
table.remove(p)
elseif v ~= '.' then
table.insert(p, v)
end
end
return implode_path(dr, p)
end
end
function cd(path)
-- TODO path simplification etc
local newcwd = pathcat(_cwd, path)
local s = sys.stat(newcwd)
if not s then
print("not found: " .. newcwd)
elseif s.type & sysdef.FT_DIR == 0 then
print("not a directory: " .. newcwd)
else
_cwd = newcwd
print(_cwd)
end
end
function cwd()
return _cwd
end
function ls(path)
path = pathcat(_cwd, path)
local fd = sys.open(path, sysdef.FM_READDIR)
if not fd then
print("Could not open " .. path)
else
local i = 0
while true do
x = sys.readdir(fd, i)
if not x then break end
if x.type & sysdef.FT_DIR ~= 0 then
x.name = x.name .. '/'
end
print(x.type, x.access, x.size, x.name)
i = i + 1
end
sys.close(fd)
end
end
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