Followup to #28515:
Rename the static os_homedir() to os_uv_homedir() to emphasize that it
is a wrapper around a libuv function.
Add the function os_get_homedir() to os/env.c to return the cached
homedir value as a const. Must be called after homedir is initialized or
it fails.
The difference between this function and the static os_uv_homedir() is
that the latter gets the homedir from libuv and is used to initialize
homedir in init_homedir(), while os_get_homedir() just returns homedir
as a const if it's initialized and is public.
Use the os_get_homedir() accessor for ~/ expansion on Windows to make
the code more concise.
Add a Windows section to main_spec.lua with tests for expanding ~/ and
~\ prefixes for files passed in on the command-line.
Signed-off-by: Rafael Kitover <rkitover@gmail.com>
1a1c766049