[Bug 1178618] Re: add a command to detect function key status.

[Hsin-Yi, Chen (hychen)]

@Colin , @James

Yes, I understand the patch is not perfect solution, user will need to
repeat key pressing until it is trigged.

The author of the patch , Cyrus have tried the menuentry --hotkey
option, but It does not fit our need because we hope the hotkey can
still be trigged even menu is hidden (like sleep command does).

by current design, the --hotkey option only works when menu is not
hidden .

** Changed in: oem-priority/precise
       Status: Incomplete => Confirmed

** Changed in: oem-priority
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1178618

Title:
  add a command to detect function key status.

Status in GRand Unified Bootloader:
  New
Status in OEM Priority Project:
  Confirmed
Status in OEM Priority Project precise series:
  Confirmed
Status in “grub2” package in Ubuntu:
  New

Bug description:
  
  Grub2 can detect key modifier status in 'sleep --interruptible', 
  so that you can interrupt the sleep by pressing Shift.
  (src: grub-core/commands/sleep.c)

  It will be useful if grub2 can also detect function key status,
  so user can boot to pre-defined grub menu entry by press specified
  function key.

  Here is a proposed command name and usage.

  - getfunctionkey -i {sec} {keyname}

  Here is an example of configuration that user can start memory test
  whiling he is pressing F9.

  ```
  if ! getfunctionkey -i 3 f9 ; then
  menuentry "Memory test (memtest86+)" {                                                                                                                                                                           
          insmod part_msdos
          insmod ext2
          set root='(hd0,msdos1)'
          search --no-floppy --fs-uuid --set=root d458babc-81f0-4dd7-ac88-410407141e2c
          linux16 /boot/memtest86+.bin
  }
  fi
  ```

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