This patch is to enhance vi so it will run a command after each write,
which can be used to implement WYSIWYG functionality, with ghostview.

*** old/src/contrib/nvi/docs/USD.doc/vi.man/vi.1	Sun Mar 30 00:55:07 1997
--- new/src/contrib/nvi/docs/USD.doc/vi.man/vi.1	Sun Mar 30 01:00:20 1997
***************
*** 21,26 ****
--- 21,28 ----
  ] [\c
  .BI -c " cmd"\c
  ] [\c
+ .BI -C " cmd_after_write"\c
+ ] [\c
  .BI -t " tag"\c
  ] [\c
  .BI -w " size"\c
***************
*** 32,37 ****
--- 34,41 ----
  ] [\c
  .BI -c " cmd"\c
  ] [\c
+ .BI -C " cmd_after_write"\c
+ ] [\c
  .BI -t " tag"\c
  ] [\c
  .BI -w " size"\c
***************
*** 43,48 ****
--- 47,54 ----
  ] [\c
  .BI -c " cmd"\c
  ] [\c
+ .BI -C " cmd_after_write"\c
+ ] [\c
  .BI -t " tag"\c
  ] [\c
  .BI -w " size"\c
***************
*** 108,113 ****
--- 114,130 ----
  This is the POSIX 1003.2 interface for the historic ``+cmd'' syntax.
  .I Nex/nvi
  supports both the old and new syntax.
+ .TP 
+ .B \-C
+ Execute
+ .B cmd_after_write
+ immediately after every file write, (via system(3)).
+ Can be used to call tools like make,
+ to read newly updated vi source file,
+ then generate a new postscript equivalent output file,
+ then send a signal
+ to a program such as ghostview, to request a reopen (& display of newly reformatted data) .
+ .\" A periodic auto. write option would also be nice.
  .TP
  .B \-e
  Start editing in ex mode, as if the command name were