Since vim doesn't support having some lines editable and others not, I figured
it out that I can simulate this by keeping meta data about lines and remapping
all keys to a function which checks cursor position and decides whether to put
the character in question or not. So far so good, now I need to prohibit the
cursor from going to certain locations. I remapped h,j,k,l keys like this:
map <expr> h Key_h()
map <expr> j Key_j()
map <expr> k Key_k()
map <expr> l Key_l()
That also works like a charm. Somewhere in the those functions I call setpos()
like this:
call setpos(".", [0, a:line, a:column, 0])
Unfortunately the only thing this does is to send cursor the first column at
the line it is currently in. Further movement with h,j,k,l does nothing. >From
inside the mapped functions Key_h(), Key_j() I return nothing, since cursor
movement is already performed.
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