function! InsertRandomText(low_range, high_range) " {{{

python3 << EOF

import random, string, vim

# Text has to large from a larger sample in order to avoid errors.

text = random.sample(

(10 * string.ascii_lowercase + string.digits + ' '),

random.randint(int(vim.eval('a:low_range')), int(vim.eval('a:high_range'))))

vim.current.buffer.vars['random_text'] = ''.join(text)

EOF

let l:textwidth = &tw

set tw=0

execute "normal! i" . b:random_text

let &tw = l:textwidth

return len(b:random_text)

function! DeleteChars(nchars) " {{{

let l:textwidth = &tw

set tw=0

execute "normal! " . (repeat('h', a:nchars - 1))

execute "normal! " . repeat('x', a:nchars)

let &tw = l:textwidth

function! JumpToRandomPosition() " {{{

python3 << EOF

import random, vim

cw = vim.current.window

cb = vim.current.buffer

rand_line = random.randint(1, len(cb) - 1)

rand_line_len = len(cb[rand_line])

rand_col = random.randint(0, rand_line_len) if rand_line_len > 0 else 0

cw.cursor = (rand_line, rand_col)

EOF

function! DeleteRandomLines(low_range, high_range) " {{{

python3 << EOF

import random, vim

del_lines = random.randint(

int(vim.eval('a:low_range')), int(vim.eval('a:high_range')))

vim.current.buffer.vars['del_lines'] = del_lines

EOF

execute "normal! " . b:del_lines . "dd"

return b:del_lines

function! InsertTextAtRandomPositions(ntimes) " {{{

let l:total_lines = line('$')

for i in range(a:ntimes)

python3 << EOF

import random, vim

del_method = random.randint(0, 1)

vim.current.buffer.vars['del_method'] = del_method

EOF

call JumpToRandomPosition()

if b:del_method

let l:inserted_chars = InsertRandomText(3, 100)

call DeleteChars(l:inserted_chars)

else

let l:current_line = getpos('.')[1]

let l:deleted_lines = DeleteRandomLines(1, 5)

if l:current_line + l:deleted_lines <= l:total_lines

execute "normal! P"

else

execute "normal! p"

endif

endif

endfor