nim-gapbuffer/example.nim

import gapbuffer
import strutils

var buf = "Hello, world!".toGapBuffer()

proc dumpInfo =
  echo buf.head.join(), "|", buf.tail.join()
  echo buf
  echo()

dumpInfo()
buf.move(6)
dumpInfo()
buf.delete()
dumpInfo()
buf.insert('!')
dumpInfo()
buf[buf.pos] = ','
dumpInfo()
buf.moveTo(0)
dumpInfo()
buf[buf.pos] = 'h'
dumpInfo()
buf.moveTo(buf.len - 1)
dumpInfo()

buf.insert("abc\ndef\cghi\ljkl\c\lmno")
var i = 0
for line in buf.splitLines():
  echo(i, ": ", line.join())
  inc i
echo()

buf.insert("\n")
buf.moveTo(10)
i = 0
for line in buf.splitLines():
  echo(i, ": ", line.join())
  inc i
echo()