input mask sokoban style

Hello.

I admit enjoying the vim sokoban play.
But I don't understand the code.


As i'm writing a special flatfile database for my own purpuses,
an input mask like the sokoban play would be very helpful.
I mean having a "level" file with a structure like a sokoban maze,
where you can only move in special regions.
This "mask file" were to be loaded when editing a database entry,
but, using a function,
input is only possible inside certain fields, inside the mask e.g.:

############################################
## ####### #### ##
## ####### #### ##
############################################

Input is only possible in the blank space regions, and you switch
to the next input region with the tab. Thus it is mainly a command
"columns with a # on it are forbidden, blank spaces may be edited,
switch to next blank space region with the X key".
Then, the structured resulted file can be subjected to further
processing.

How difficult is this to implement? Do the experts say

(a) start studying the vim scripting language and find out after
learning the essentials
(b) the essentials are not enough, this is higher (deeper) black magic
(c) give it up
(d) here's the function you need: ****
(e) rtfm ****.vim

Considering this problem I didn't know how to google, I tried, but got
nothing helpful.

Thanking for any hint or advice,

erch




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