modifying a few characters in a buffer (sanity check)

[Ernie Rael]

I've done little vim9script programing (and no vimscript).

I want to replace a part of a buffer line. I thought to do "getline()",
slicing, "setline()", no joy; I couldn't see any way to manipulate the
string directly.Anything better I couldn't find? I'm still getting used
to the synthesis of vim9script and vim commands

In the following, F1() seems expensive, F2() feels uncomfortable (for
example 'x' command might go to the next line). For performance is F2()
better (assuming there's some checking).

Any comments/suggestions appreciated

-ernie

vim9script
# This line gets modified
# This line gets modified

def F1(lino: number, pos1: number, pos2: number, newtext: string)
    var t1 = getline(lino)->str2list()
    t1->remove(pos1, pos2)
    t1->extend(str2list(newtext), pos1)->list2str()->setline(lino)

enddef

def F2(lino: number, pos1: number, pos2: number, newtext: string)
    cursor(lino, pos1 + 1)
    execute 'normal ' .. (pos2 - pos1 + 1) .. 'x'
    execute 'normal i' .. newtext
enddef

F1(2, 12, 15, 'BOO')
F2(3, 12, 15, 'FOO')

[Ernie Rael]

IGNORE. I got stuck trying to do an assignment: "a[ : ] = xx". slicing
works great.
-ernie

[bfrg]

This has already been requested in the past, see
https://github.com/vim/vim/issues/5632.

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