* include/grub/parser.h: New file.
* kern/parser.c: Likewise.
* conf/i386-pc.rmk (kernel_img_SOURCES): Add `kern/parser.c'.
(grub_setup_SOURCES): Likewise.
(grub_probefs_SOURCES): Likewise.
(grub_emu_SOURCES): Likewise.
(kernel_img_HEADERS): Add `parser.h'.
* conf/powerpc-ieee1275.rmk (grubof_HEADERS): Add `parser.h'.
(grub_emu_SOURCES): Add `kern/parser.c'.
(grubof_SOURCES): Likewise.
* conf/sparc64-ieee1275.rmk (grubof_HEADERS): Add `parser.h'.
(grubof_SOURCES): Add `kern/parser.c'.
* include/grub/misc.h (grub_split_cmdline): Removed prototype.
* kern/misc.c (grub_split_cmdline): Removed function.
* kern/rescue.c: Include <grub/parser.h>.
(grub_enter_rescue_mode): Use `grub_parser_split_cmdline' instead
of `grub_split_cmdline'.
* normal/command.c: Include <grub/parser.h>.
(grub_command_execute): Use `grub_parser_split_cmdline' instead
of `grub_split_cmdline'.
* normal/completion.c: Include <grub/parser.h>.
(cmdline_state): New variable.
(iterate_dir): End the filename with a quote depending on the
command line state.
(get_state): new function.
(grub_normal_do_completion): Use `grub_parser_split_cmdline' to
split the arguments and determine the current argument. When the
argument string is not quoted, escape all spaces.
