*todo.txt*      For Vim version 6.0as.  Last change: 2001 Aug 19


		  VIM REFERENCE MANUAL	  by Bram Moolenaar


			      TODO list for Vim		*todo*

This is a veeeery long list of known bugs, current work and desired
improvements.  To make it a little bit accessible, the items are grouped by
subject.  In the first column of the line a classification is used to be able
to look for "the next thing to do":

Priority classification:
9   next point release
8   next release
7   as soon as possible
6   soon
5   should be included
4   nice to have
3   consider including
2   maybe not
1   probably not
-   unclassified

See |votes-for-changes| for a list of votes on desired changes in Vim.
See |develop.txt| for development plans.

							*known-bugs*
-------------------- Known bugs and current work -----------------------

Win32 client-server:
- In the console version a received message isn't handled until a key is
  pressed.
- In the GUI a received message isn't handled until the mouse pointer is in
  the window or the cursor is blinking.

Fonts for tooltips and balloons can be set with two resources, but there is
actually only one font.

When 'virtualedit' is "block", I# moves to before a TAB.
When 'virtualedit' is "all", I# inserts one space too many on Tabs. (Karlsen)
Using 'virtualedit' in Insert mode: When typing at the end of the line a
character overwrites the last one in the line. (Ed Ralston)


Vi incompatibility:
8   With undo/redo only marks in the changed lines should be changed.  Other
    marks should be kept.  Vi keeps each mark at the same text, even when it
    is deleted or restored. (Webb)
    Also: A mark is lost after: make change, undo, redo and undo.
    Example: "{d''" then "u" then "d''": deletes an extra line, because the ''
    position is one line down. (Veselinovic)
8   When stdin is not a tty, and Vim reads commands from it, an error should
    make Vim exit.
8   Unix Vim (not gvim): Typing CTRL-C in Ex mode should finish the line
    (currently you can continue typing, but it's truncated later anyway).
8   When loading a file in the .exrc, Vi loads the argument anyway.  Vim skips
    loading the argument if there is a file already. When no file argument
    given, Vi starts with an empty buffer, Vim keeps the loaded file. (Bearded)
8   In Insert mode, when using <BS> or <Del>, don't wipe out the text, but
    only move back the cursor.	Behaves like '$' in 'cpoptions'.  Use a flag
    in 'cpoptions' to switch this on/off.
8   When editing a file which is a symbolic link, and then opening another
    symbolic link on the same file, Vim uses the name of the first one.
    Adjust the file name in the buffer to the last one used?  Use several file
    names in one buffer???
    Also: When first editing file "test", which is symlink to "test2", and
    then editing "test2", you end up editing buffer "test" again.  Change the
    name of the buffer to the actual file, instead of using the name of the
    symlink?
7   The ":undo" command works differently in Ex mode.  Edit a file, make some
    changes, "Q", "undo" and _all_ changes are undone, like editing the file
    was one command.
7   The ":map" command output overwrites the command.  Perhaps it should keep
    the ":map" when it's used without arguments?
7   When interrupting reading a file, Vi considers the buffer modified.  Add a
    'cpoptions' flag for this (we don't want it modified always to be able to
    do ":q")?
7   CTRL-L is not the end of a section?  It is for Posix!  Make it an option.
7   Implement 'prompt' option.	Init to off when stdin is not a tty.
7   CTRL-T in Insert mode inserts 'shiftwidth' of spaces at the cursor.  Add a
    flag in 'cpoptions' for this.
7   Add a way to send an email for a crashed edit session.  Create a file when
    making changes (containing name of the swap file), delete it when writing
    the file.  Supply a program that can check for crashed sessions (either
    all, for a system startup, or for one user, for in a .login file).
7   Vi doesn't do autoindenting when input is not from a tty (in Ex mode).
7   "z3<CR>" should still use the whole window, but only redisplay 3 lines.
7   ":tag xx" should move the cursor to the first non-blank.  Or should it go
    to the match with the tag?	Option?
7   Implement 'autoprint'/'ap' option.
7   Add flag in 'cpoptions' that makes <BS> after a count work like <Del>
    (Sayre).
7   Add flag in 'cpoptions' that makes operator (yank, filter) not move the
    cursor, at least when canceled. (default vi compatible).
7   Make "5dd" on last-but-one-line not delete anything (Vi compatible).
    Add flag in 'cpoptions' for this.  When not present, "2dd" in the last
    line should delete the last line.
7   This Vi-trick doesn't work: "Q" to go to Ex mode, then "g/pattern/visual".
    In Vi you can edit in visual mode, and when doing "Q" you jump to the next
    match.  Nvi can do it too.
7   Support '\' for line continuation in Ex mode for these commands: (Luebking)
	g/./a\		    g/pattern1/ s/pattern2/rep1\\
	line 1\		    line 2\\
	line 2\		    line 3\\
	.		    line4/
6   ":e /tmp/$tty" doesn't work.  ":e $uid" does.  Is $tty not set because of
    the way the shell is started?
6   Vi compatibility (optional): make "ia<CR><ESC>10." do the same strange
    thing.  (only repeat insert for the first line).


GTK+ GUI known bugs:
-   When using the file browser in GTK the absolute file name is used.  Should
    try to simplify it. (Lohner)
9   GTK GUI with Gnome: When $DISPLAY is wrong, ":gui" unexpectedly exits.
    Without Gnome it does work.
    Not all Gnome arguments get to gnome_init().
9   When logging out from KDE, vim is not told to save its files.  Catching
    the WM_SAVE_YOURSELF event doesn't work.
9   When selecting a font from the font selector with an embedded space it
    cannot be found. (Tsirkin)
8   When a font is not fixed width, the message "not fixed-width" disappears
    immediately. (Tsirkin)
    Add some code to handle proportional fonts?  Need to draw each character
    separately (like xterm).  Also for when a double-width font is not exactly
    double-width. (Maeda)
9   Can't paste a Visual selection from GTK-gvim to vim in xterm when it is
    longer than 4000 characters.  Works OK from gvim to gvim and vim to vim.
    Pasting through xterm (using the shift key) also works.
9   With the guifont "-*-clean-medium-r-*-*-8-*-*-*-*-80-*" bold characters
    are drawn wrong.  Try on C source code.  The bold font is wider than the
    medium font.  Check bold font cellsize and use bold font trick if it's
    wrong?
8   Font "7x14" has a bold version "7x14bold".  Try to find the bold font by
    appending "bold" when there are not 14 dashes.
8   When using "gvim -geom 40x30" or setting 'columns' in .gvimrc or with a
    GUIEnter autocommand, the width is still set to fit the toolbar.  Also
    happens when changing the font.  How to avoid that the toolbar specifies
    the minimal window width?


Win32 GUI known bugs:
8   Windows NT: writing to aux.* makes Vim hang. (Acevedo)
8   When using two monitors, the code that checks/fixes the window size and
    position (e.g. when a font changes) doesn't work properly. (George Reilly)
8   Win32 GUI: With maximized window, ":set go-=r" doesn't use the space that
    comes available. (Poucet)  It works OK on Win 98 but doesn't work on Win
    NT 4.0.  Leaves a grey area where the scrollbar was.  ":set go+=r" also
    doesn't work properly.
8   The dialog boxes don't have an indication of which button is the default.
    E.g., the dialog for a changed file. (Webb)
8   When Vim is minimized and when maximizing it a file-changed dialog pops
    up, Vim isn't maximized.  It should be done before the dialog, so that it
    appears in the right position. (Webb)
8   When activating window with mouse click, don't move cursor to mouse click.
    Catch WM_MOUSEACTIVATE. (Luevelsmeyer)
9   When selecting at the more-prompt or hit-enter-prompt, the right mouse
    button doesn't give popup menu.
    At the hit-enter prompt CTRL-Y doesn't work to copy the modeless
    selection.
9   When there are more than 32767 lines, the scrollbar has a roundoff error.
    Clicking the up or down error scrolls two lines or more.  Looks like there
    is an extra event that reports the new position of the scrollbar.
9   When file modified outside of Vim and Vim gets focus, redraw is wrong.
    Put focus event in input buffer and let generic Vim code handle it.
    Try this: ":set sw ts", get enter-prompt, then change the file and clock
    "reload" in the dialog for the changed file: Window moves with the cursor!
8   When 'grepprg' doesn't execute, the error only flashes by, the
    user can hardly see what is wrong. (Moore)
    Could use vimrun with an "-nowait" argument to only wait when an error
    occurs, but "command.com" doesn't return an error code.
8   When the 'shell' cannot be executed, should give an appropriate error msg.
    Esp. for a filter command, currently it only complains the file could not
    be read.
8   MessageBox used for error messages can be too big.	There is no way to
    scroll it, or even hit the OK button (but you can hit return).
    Use a scrollable window.
7   Add an option to add one pixel column to the character width?  Lucida
    Console italic is wider than the normal font ("d" overlaps with next char).
7   At the hit-enter prompt scrolling now no longer works.  Need to use the
    keyboard to get around this.  Pretend <CR> was hit when the user tries to
    scroll?
7   'mousefocus' is disabled until the next mouse click, when trying to exit
    by hitting the X in the title bar. (Webb)
7   Scrollbar width doesn't change when selecting other windows appearance.
    Also background color of Toolbar and rectangle below vert. scrollbar.
7   "!start /min cmd" should run in a minimized window, instead of using
    "/min" as the command name. (Rogall)
6   Drawing text transparantly doesn't seem to work (when drawing part cursor).
8   CTRL key doesn't always work in combination with ALT key.  It does work
    for function keys, not for alphabetic characters.
8   CTRL-@ doesn't work.  Don't even get a message for it?
8   CTRL-- doesn't work for AZERTY, because it's CTRL-[ for QWERTY.  How do we
    know which keyboard is being used?
7   When scrolling, and a background color is dithered, the dither pattern
    doesn't always join correctly between the scolled area and the new drawn
    area (Koloseike).
8   Tear-off menu causes a crash when it contains many items (>100).
    (Pedro Gomes)  Probably because DLG_ALLOC_SIZE is a fixed number.


Athena and Motif:
8   Perhaps use fontsets for everything?
6   When starting in English and switching the language to Japanese, setting
    the locale with ":lang", 'guifontset' and "hi menu font=", deleting all
    menus and setting them again, the menus don't use the new font.


Athena GUI:
9   When dragging the scrollbar thumb very fast, focus is only obtained in
    the scrollbar itself.  And the thumb is no longer updated when moving
    through files.
7   The file selector is not resizable.  With a big font it is difficult to
    read long file names. (Schroeder)
7   The file selector's scrollbar colors are not set after doing a
    ":hi Scrollbar guifg=color". (David Harrison)
7   The file selector's colors are not changed by the colorscheme command.
    Related to the above problem.  Actually, the file selector gets it's
    colors from the menu's background color upon creation.  Is this what we
    really want?  The solution for this should match the solution for the
    Motif version.
4   Re-write the widget attachments and code so that we will not have to go
    through and calculate the absolute position of every widget every time the
    window is refreshed/changes size.  This will help the "flashing-widgets"
    problem during a refresh.
5   When starting gvim with all the default colors and then typing
    ":hi Menu guibg=cyan", the menus change color but the background of the
    pullright pixmap doesn't change colors.
    If you type ":hi Menu guibg=cyan font=anyfont", then the pixmap changes
    colors as it should.
    Allocating a new pixmap and setting the resource doesn't change the
    pullright pixmap's colors.  Why?  Possible Athena bug?


Motif GUI:
8   In Japanese, Athena automatically uses the right fonts for the menus.  Why
    doesn't this happen for Motif?
8   Popup menu ordering is wrong.
8   Dialog: Accelerators don't work yet.
8   Lesstif: When deleting a menu that's torn off, the torn off menu becomes
    very small instead of disappearing.  When closing it, Vim crashes.
    (Phillipps)


GUI:
9   When using a very small font, 'columns' can be very big.  Pass mouse
    events with 16 bits.
9   On Solaris, creating the popup menu causes the right mouse button no
    longer to work for extending the selection. (Halevy)
9   When running an external program, it can't always be killed with CTRL-C.
    e.g. on Solaris 5.5, when using "K" (Keech).  Other 'guipty' problems on
    Solaris 2.6. (Marley)
9   On Solaris: Using a "-geometry" argument, bigger than the window where Vim
    is started from, causes empty lines below the cmdline. (raf)
8   X11 GUI: When menu is disabled by excluding 'm' from 'guioptions', ALT key
    should not be used to trigger a menu (like the Win32 version).
8   When setting 'langmenu', it should be effective immediately.  Store both
    the English and the translated text in the menu structure.  Re-generate
    the translation when 'langmenu' has changed.
8   Basic flaw in the GUI code: NextScreen is updated before calling
    gui_write(), but the GUI code relies on NextScreen to represent the state
    of where it is processing the output.
    Need better separation of Vim core and GUI code.
8   When fontset support is enabled, setting 'guifont' to a single font
    doesn't work.
8   Menu priority for sub-menus for: Amiga, Mac, VMS, BeOS.
8   Add menu separators for Amiga, Mac, RISCOS.
8   Add way to specify the file filter for the browse dialog.  At least for
    browse().
8   Add dialog for search/replace to other GUIs?  Tk has something for this,
    use that code?  Or use console dialog.
8   When selecting a font with the font dialog and the font is invalid, the
    error message disappears too quick.
8   gui_check_colors() is not called at the right moment.  Do it much later,
    to avoid problems.
8   gui_update_cursor() is called for a cursor shape change, even when there
    are mappings to be processed.  Only do something when going to wait for
    input.  Or maybe every 100 ms?
8   X11: When the window size is reduced to fit on screen, there are blank
    lines below the text and bottom scrollbar.  "gvim -geometry 80x78+0+0".
    When the "+0+0" is omitted it works.
8   When starting an external command, and 'guipty' set, BS and DEL are mixed
    up.  Set erase character somehow?
8   A dead circumflex followed by a space should give the '^' character
    (Rommel).  Look how xterm does this.
    Also: Bednar has some code for dead key handling.
    Also: Nedit 5.0.2 with USE_XMIM does it right. (Gaya)
8   The compose key doesn't work properly (Cepas).  Both for Win32 and X11.
7   The cursor in an inactive window should be hollow.  Currently it's not
    visible.
7   GUI on Solaris 2.5.1, using /usr/dt/..: When gvim starts, cursor is
    hollow, after window lowered/raised it's OK. (Godfrey)
7   When starting GUI with ":gui", and window is made smaller because it
    doesn't fit on the screen, there is an extra redraw.
8   When setting font with .Xdefaults, there is an extra empty line at the
    bottom, which disappears when using ":set guifont=<Tab>". (Chadzelek)
8   When font shape changes, but not the size, doing ":set font=" does not
    redraw the screen with the new font.  Also for Win32.
    When the size changes, on Solaris 2.5 there isn't a redraw for the
    remaining part of the window (Phillipps).
-   Flashes really badly in certain cases when running remotely from a Sun.
4   Re-write the code so that the highlighting isn't changed multiple times
    when doing a ":hi clear".  The color changes happen three or more times
    currently.  This is very obvious on a 66Mhz 486.


MSDOS/DJGPP:
8   DJGPP: "cd c:" doesn't work.  Works OK in 16-bit version.  mch_getperm()
    returns -1 for "c:".
9   The 16 bit version runs out of memory very quickly.  Should find unused
    code and reduce static data.
9   DOS: Make CTRL-Fx and ALT-Fx work.
    CTRL-F1 = CE-5E, CTRL-F2 = CE-5F, .., CTRL-F10 = CE-67
    ALT-F1 = CE-68, ALT-F2 = CE-69, .., ALT-F10 = CE-71
    Shifted cursor keys produce same codes as unshifted keys.  Use bioskey(2)
    to get modifier mask for <S-C-M-Fx>.
    Use CSI codes to insert modifier mask in input stream?  Make this work
    like in the GUI, but do handle a typed CSI.
    Mapping things like <M-A> doesn't work, because it generates an extended
    key code.  Use a translation table?
9   Can't read an opened swap file when the "share" command has not been used.
    At least ignore the swap files that Vim has opened itself.
8   setlocale() is bogus.
8   Vim busy waits for new characters or mouse clicks.	Should put in some
    sort of sleep, to avoid eating 50% of the CPU time.  Test on an unpatched
    Windows 95 system!
8   DJGPP: when shell is bash, make fails. (Donahoe)
7   Hitting CTRL-P twice quickly (e.g. in keyword completion) on a 8088
    machine, starts printer echo! (John Mullin).
7   MSDOS 16 bit version can't work with COMSPEC that has an argument, e.g.:
    COMSPEC=C:\WINDOWS\COMMAND.COM /E:4096    (Bradley)
    Caused by BCC system() function (Borland "make" has the same problem).
8   Mouse: handle left&right button pressed as middle button pressed.  Add
    modifier keys shift, ctrl and alt.
7   When too many files are open (depends on FILES), strange things happen.
    The Dos16 version runs out of memory, in the Dos32 version "!ls" causes a
    crash.  Another symptom: .swp files are not deleted, existing files are
    "[New file]".
7   DJGPP version doesn't work with graphics display mode.  Switch to a mode
    that is supported?
8   DJGPP: ":mode" doesn't work for many modes.  Disable them.
8   DJGPP: When starting in Ex mode, shouldn't clear the screen. (Walter
    Briscoe)


MSDOS, OS/2 and Win32:
8   OS/2: Add backtick expansion.  Undefine NO_EXPANDPATH and use
    gen_expand_wildcards().
8   OS/2: Add clipboard support?  See example clipbrd.exe from Alexander
    Wagner.
8   OS/2: Add Extended Attributes support and define HAVE_ACL.
8   Win32 console: <M-Up> and <M-Down> don't work. (Geddes)  We don't have
    special keys for these.  Should use modifier + key.
8   Win32 console: caps-lock makes non-alpha keys work like with shift.
    Should work like in the GUI version.
8   Environment variables in DOS are not case sensitive.  Make a define for
    STRCMP_ENV(), and use it when comparing environment var names.
8   Setting 'shellslash' has no immediate effect.  Change all file names when
    it is set/reset?  Or only use it when actually executing a shell command?
8   When editing a file on a Samba server, case might matter.  ":e file"
    followed by ":e FILE" will edit "file" again, even though "FILE" might be
    another one.  Set last used name in buflist_new()?  Fix do_ecmd(), etc.


Windows 95:
8   Editing a file by it's short file name and writing it, makes the long file
    name disappear.  Setting 'backupcopy' helps.
    Use FindFirstFile()->cAlternateFileName in fname_case() (George).
8   Doing wildcard expansion, will match the short filename, but result in the
    long filename (both DJGPP and Win32).


Win32 console:
9   When editing a file by its short file name, it should be expanded into its
    long file name, to avoid problems like these: (Mccollister)
     1) Create a file called ".bashrc" using some other editor.
     2) Drag that file onto a shortcut or the actual executable.
     3) Note that the file name is something like BASHRC~1
     4) Go to File->Save As menu item and type ".bashrc" as the file name.
     5) Press "Yes" to indicate that I want to overwrite the file.
     6) Note that the message "File exists (use ! to override)" is displayed
	and the file is not saved.
    Use FindFirstFile() to expand a file name and directory in the path to its
    long name.
8   Also implement 'conskey' option for the Win32 console version?  Look at
    how Xvi does console I/O under Windows NT.
7   Re-install the use of $TERM and support the use of different terminals,
    besides the console.
8   Use of <altgr> modifier doesn't work?  5.3 was OK. (Garcia-Suarez/Guckes)
9   Mapping <C-S-Tab> doesn't work correctly.
9   tmpnam() uses file in root of file system: "\asdf".  That doesn't work on
    a Netware network drive.  Use same function as for Win32 GUI?
8   In os_win32.h, HAVE_STRICMP and HAVE_STRNICMP are defined only if __GNUC__
    is not defined.  Shouldn't that be the other way around?
9   When using libcall() for a function that returns an invalid pointer, Vim
    crashes.  Check for a bad pointer with isBadReadPtr() doesn't appear to
    work well.


Amiga:
9   In mch_expandpath() a "*" is to be expanded, but "\*" isn't.  Remove
    backslashes in result.
8   Executing a shell, only one option for 'shell' is separated.  Should do
    all options, using white space separation.


Macintosh:
8   Define vim_mkdir() for Macintosh.
8   Define mch_writable() for Macintosh.
9   Explorer.vim isn't working properly.
8   Carbon version under MacOS X is slower than Classic version.
9   Vim cannot be renamed to something else (or it won't be able to find the
    $VINRUTIME)
8   $HOME is supported under MacOS X, but ~ is not.
9   When DiskLock is running, using a swap file causes a crash.  Appears to be
    a problem with writing a file that starts with a dot. (Giacalone)
9   On G3 Mac, OS version 8, control strip causes characters messed up when
    scrolling (CTRL-L cleans it up). (Benji Fisher)
9   On G3 Mac, OS version 8, variable-speed scrolling doesn't work, after two
    seconds of scrolling the screen freezes. (Benji Fisher)
    scrolling (CTRL-L cleans it up). (Benji Fisher)
9   In mac_expandpath() check that handling of backslashes is done properly.
9   Executable is called "vimPPC" instead of "gvim"? (Amerige)
8   Standard Mac buttons and shortcuts are missing.  No close button.
    (Amerige)
8   An invocation of gvim hands over control to an existing gvim. (Amerige)
8   Handling of non-fixed width fonts is wrong. (Amerige)
8   StatusLine and StatusLineNC highlighting isn't right. (Amerige)


VMS:
8   vimdiff doesn't work, because the diff output looks different.


"Small" problems:
8   ":hardcopy":
    - Separate the machine independent and machine specific parts better. (Mike
      Williams)
    - Need to handle unprintable characters.
    - ml_get error? (Xiangjiang Ma)
    - On a B&W printer syntax highlighting isn't visible.  Perform dithering
      to make grey text?
8   In Visual block mode with 'lbr' set, a change command doesn't insert the
    text in following lines where the linebreak changes.
9   dosinst.c: The DJGPP version can't uninstall the Uninstall registry key on
    Windows NT.  How to install a .inf file on Windows NT and how to detect
    that Windows NT is being used?
8   When opening the same file on Unix and on MS-Windows, there is no
    ATTENTION message, because the path in the swap file is different.  Using
    a relative path name will cause no ATTENTION for Vim 5.8.
    Somehow add a flag that the swap file is in the same dir as the file?
9   When XIM is being used, sometimes one character is lost.  Probably when
    XIM has just been enabled.
9   Using "rx" with 'virtualedit' set on a double-wide UTF-8 character of
    three bytes, keeps the first two bytes and adds a space.  Should replace
    the whole character if it's the same width, insert a space when it's
    smaller.
7   When 'virtualedit' is used, moving with "$" and the "rx" still replaces
    the whole block instead of until the end of the line in each line.
8   ":hardcopy": Using the cterm_color[] table is wrong when t_colors is > 16.
8   A nested include file should also be found relative to the file that
    includes it.  "lev1/foo.h" includes "lev2/bar.h" which is
    "lev1/lev2/bar.h".  Should pass current file name on from
    find_pattern_in_path() to get_file_name_in_path(). (Angus Mackay)
9   When jumping to a tag, the search pattern is put in the history.  When
    'magic' is on, the pattern may not work.  Translate the pattern depending
    on p_magic when putting it in the history?  Alternative: Store value of
    'magic' in history.  (Margo)
9   Viminfo file becomes corrupt when editing a file with a <NL> in the name.
    (file marks, buffer list, history of marks) (Alexander N.Benner, Wichert
    Akkerman, Weisselberg)
    Also problems with buffer menu.
9   optwin.vim: Restoring a mapping for <Space> or <CR> is not correct for
    ":noremap".  Add "mapcmd({string}, {mode})?  Use code from ":mkexrc".
9   incsearch is incorrect for "/that/<Return>/this/;//" (last search pattern
    isn't updated).
9   term_console is used before it is set (msdos, Amiga).
9   Get out-of-memory for ":g/^/,$s//@/" on 1000 lines, this is not handled
    correctly.  Get many error messages while redrawing the screen, which
    cause another redraw, etc.
8   [<C-I> doesn't work when '*' is in 'iskeyword'.  find_pattern_in_path()
    must escape special characters in the pattern.
8   Vim can overwrite a read-only file with ":w!".  ":w" can't overwrite an
    existing file, "w!" can, but perhaps not a read-only file?  Then use
    ":w!!" for that.
    Or ask for permission to overwrite it (if file can be made writable) and
    restore file to readonly afterwards.
7   When compiled with "xterm_clipboard", startup can be slower and might get
    error message for invalid $DISPLAY.  Try connecting to the X server in the
    background (forked), so that Vim starts up quicker?
8   For xterm need to open a connection to the X server to get the window
    title, which can be slow.  Can also get the title with "<Esc>[21t", no
    need to use X11 calls.  This returns "<Esc>]l{title}<Esc>\".
8   When the builtin xterm termcap contains codes that are not wanted, need a
    way to avoid using the builtin termcap.
8   '[ and '] should be set to start/end of line when using a linewise operator
    (e.g., ":w").
8   CTRL-A can't handle big "long" numbers, they become negative.  Check for
    "-" character, if not present, use unsig                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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