knownbug.txt

操作系统源代码

The following options are missing:
	[no]optimize	- affects screen redrawing method
	[no]redraw	- simulate character insertion by redrawing line
	[no]slowopen	- don't use character insertion
	tags="tags"	- list of tags, used as TAGPATH

I'd like to improve the versatility of the options whose value is a command:
cc, make, kp, and ep.  I'd like to add some notation that allows you to say
where to insert the current filename or current word.
-------------------------------------------------------------------------------
Currently, elvis is configured to look for | only in .exrc files.  It doesn't
look for | in any interactively entered command lines, yet.
-------------------------------------------------------------------------------
The 'p', '#', and 'l' flags aren't supported.  Also, ex commands don't accept
counts; e.g., ":c5" can't be used to change five lines. 
-------------------------------------------------------------------------------
The following have been reported, but have not been verified.  If you have
experienced any of the following, and haven't reported it yet, then please
report it now!  I need more information about these bugs.

[Bugs that are not in this list should also be reported, of course.]

- Under VMS on an 80-column screen, after scolling sideways to approximately
  column 110, a ^L will not redraw the part of the line after the cursor.
- On an Atari ST running under TOS: some ASCII keys seem to send '#' plus
  another key.  (This is normal for non-ASCII keys like <F1> or <Help>, but
  ASCII keys should always send a single ASCII character.)
-------------------------------------------------------------------------------
BIG JOBS:
  Desirable extension: merge input mode and visual command mode.
  Display long lines by wrapping, like the real vi (if ":set sidescroll=0")
-------------------------------------------------------------------------------

- In the ":w >>filename" command, elvis doesn't allow any whitespace between
  the ">>" and "filename".

- Elvis doesn't allow "backslash newline" inside a single EX command.

- VMS intercepts the control-T character, which is normally used to increase
  indentation.  The <Tab> key works, but it doesn't do quite the same thing.
  (":map! ^I ^T" helps.)

- Under VMS, file I/O is very slow.  Looking over the vmsio.c file, I get the
  impression that it is rather over-done for elvis.  Its speed could
  probably be inproved.

- The errlist feature doesn't seem to work with the Borland compilers.  Perhaps
  they write to stderr instead of stdout?  This will probably be easy to solve
  once I modify the "cc" and "make" options, as described earlier.

- The command ":0" should move the cursor to line 1.  Currently, it doesn't
  move the cursor at all.

- File preservation is still flakey.  On DOS/TOS/VMS systems, it is also more
  complex that it should be.

- The act of appending to a cut buffer (as in "Ayy) sets file modification
  flag.  It shouldn't!

- The .exrc file is limited to BLKSIZE bytes -- 2048 on most systems, but
  1024 on Minicx-PC, Coherent, and MS-DOS.

- I *still* haven't quite perfected the screen update code.  If you suspect
  that the screen doesn't accurately reflect the contents of the edit buffer,
  then you should try doing a control-L.

  I'll be overhauling the screen update code soon to make it wrap long lines
  like the real vi.  I expect to fix this bug then.