--- /dev/null
+vim9script
+
+# Based on https://vim.fandom.com/wiki/Move_to_next/previous_line_with_same_indentation
+
+export def Do(step: number, diff: number)
+ var l = line(".")
+ var cin = indent(l)
+ var last = line("$")
+ var lin: number
+ while (l > 0 && l <= last)
+ l += step
+ if (strlen(getline(l)) == 0) | continue | endif
+ lin = indent(l)
+ if !(
+ ((diff == 0) && (lin == cin)) ||
+ ((diff == 1) && (lin > cin)) ||
+ ((diff == -1) && (lin < cin))
+ ) | continue | endif
+ cursor(l, lin + 1)
+ return
+ endwhile
+enddef