Vim автоматические команды: запись файла только для чтения?

J, 102 символа

8#,:' #'{~,0,.~#:(3 u:'䝝啕啕啕䑅儑啕啕啕啕䗝䔑啕䕷煝䑑凝瑗屗眕凗瑵屵具瑝屝啕啕啕啕啕啕啕甗崗睅圗病巅呷甝崝圝畇嵇睑均痑巑嗇畱嵱坱煗䝗燕䗗煵䝵'){~32-~a.i.'*'(,,[)

Объяснение. Читайте снизу вверх. :

8#,:         NB. Copy 8 times
' #'{~       NB. Turn binary 0 and 1 into space and #
,            NB. Link the array into a list
0,.~         NB. Append a 0 to the end of each row of the array.
#:           NB. Turn the list of numbers into a binary array where each row is the base-2 representation of the corresponding number
(3 u:'䝝啕啕啕䑅儑啕啕啕啕䗝䔑啕䕷煝䑑凝瑗屗眕凗瑵屵具瑝屝啕啕啕啕啕啕啕甗崗睅圗病巅呷甝崝圝畇嵇睑均痑巑嗇畱嵱坱煗䝗燕䗗煵䝵') NB. Turn this wchar string into a list of ints in range 0-65535.
{~           NB. Select numbers from the string-list whose indices are...
32-~         NB. ... 32 less than ...
a.i.         NB. ... the ascii values of ...
'*'(,,[)     NB. ... the input string with a '*' on either side!