1 files changed, 88 insertions, 0 deletions
diff --git a/src/syslua/lx/shell.lua b/src/syslua/lx/shell.lua
new file mode 100644
index 0000000..62f210f
--- /dev/null
+++ b/src/syslua/lx/shell.lua
@@ -0,0 +1,88 @@
+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
+