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grub 2.00 conditional structures syntax (in *.cfg)

From: sashab
Subject: grub 2.00 conditional structures syntax (in *.cfg)
Date: Wed, 16 Oct 2013 20:58:48 +0200
User-agent: freenetMail

Dear all, 
unfortunately i was not able to find any documentation on usage of conditional 
statements in grub configuration files.
According to the “GNU GRUB Manual 2.00~rc1” found on the 
words 'if', 'fi', 'case', 'esac', 'in' and so on are reserved.
Furthermore the scripting language is referred to as “Shell-like”.
Simple “if ; then #dosomething; fi”-statements are not problematic.
But I wasn't able to find a functional syntax for the case-statements.
To make it short: I would like to compare strings in the grub cli.
Is there any more or less exhaustive documentation about the syntax or am I 
just too dumb to use google?
The most recent version I used to test stuff was the 2.00 that comes shipped 
with arch linux.
What I'm trying to do:
I want to implement a grub configuration file that automatically generates menu 
For en example: 
The following procedure should create entries for (small) files to be loaded 
with memdisk ( from the syslinux project).
/boot/memsik is our kernel.
Our file is the initrd.
We assume that the files can be PREFIX_*.* or just *.* or README*.
(e.g. README || FLOPPY_dellbiosupdate.img || freedos.img)
The README*-files should not be processed.
For files with a prefix, the prefix should be appended as a kernel-parameter.
For files without there are no parameters to append.
I supposed that this would be “shell-like” (file=$img):

.  ..
insmod ext2
insmod regexp
.  ..
set pathtoimages=”/boot/images”
.  ..
for img in $/*; do
  set appendstr=””
  case $ in
    $/README*)  continue  ;;
    $/FLOPPY_*) set appendstr=$ floppy ;;
  menuentry “MEMDISK - $img” “$img” “$appendstr” 
    initrd16 $
.  ..

I also tried to use other quoting notations with no success.
Futhermore I also tried “if ]; ...”.

Of course, in this case, I could do somthing like this:

  for foo in $/FLOPPY_*; do
    if ; then
      menuentry “MEMDISK - $img” “$img” 

  for foo in $/RAW_*; do


But i think this is less nice and produces much more code...
Thank you very much in advance!
With kind regards, 

P.S.: Sorry if something's misspelled, English isn't my native tongue.

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