grub 2.00 conditional structures syntax (in *.cfg)

[sashab]

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 http://www.gnu.org/ 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 
entries.
 
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 ;;
      …
  esac
  menuentry “MEMDISK - $img” “$img” “$appendstr” 
    initrd16 $
  }
done
.  ..

 
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” 
       }
     fi 

  done
  for foo in $/RAW_*; do
    ...

  done


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

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




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