Couple of 'conceal' quirks

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Couple of 'conceal' quirks

Benjamin R. Haskell-8
Trying out 'conceal' using hg rev 2282:69064995302a -- full --version
info below.  I wanted to see whether it could provide a solution for the
'Indentation Vertical Lines' problem on vim-use, but I noticed a couple
quirks.

First thing I tried was:

:syntax match Emms "m" conceal cchar=%

In the following text:

"""
Testing this conceal thing.  What about ems?
What madness is this?
It only matches initial ems?
"""

I had previously searched for 'conceal', and I use 'hlsearch'.  The
search highlight on the first line apparently prevented the match on the
'm' in 'ems' (hence my text typed in confusion).

Second thing I tried was:

:syntax match Initial /^   / conceal cchar=^I
(Pattern is '/^' + 3 spaces + '/', and ^I == ^V <Tab> [literal tab])

Then text with leading spaces shows very odd refresh characteristics,
and just generally doesn't display right.  (Gets pushed to the left and
overwritten with whitespace, but pressing ^L refreshes it, only to lose
it again when scrolling.)

Try with test text:

"""
blah
   blah
      blah
         blaaaah
"""

Last line is particularly weirdly rendered.

--
Best,
Ben

VIM - Vi IMproved 7.3 BETA (2010 May 15, compiled Jul  5 2010 23:41:12)
Compiled by bhaskell@hp  [ed: hp = computer make, not affiliation]
Huge version with GTK2 GUI.  Features included (+) or not (-):
+arabic +autocmd +balloon_eval +browse ++builtin_terms +byte_offset +cindent
+clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments
+conceal +cryptv +cscope +cursorbind +cursorshape +dialog_con_gui +diff
+digraphs +dnd -ebcdic +emacs_tags +eval +ex_extra +extra_search +farsi
+file_in_path +find_in_path +float +folding -footer +fork() +gettext
-hangul_input +iconv +insert_expand +jumplist +keymap +langmap +libcall
+linebreak +lispindent +listcmds +localmap +menu +mksession +modify_fname
+mouse +mouseshape +mouse_dec +mouse_gpm -mouse_jsbterm +mouse_netterm
-mouse_sysmouse +mouse_xterm +multi_byte +multi_lang -mzscheme +netbeans_intg
-osfiletype +path_extra -perl +persistent_undo +postscript +printer +profile
-python +quickfix +reltime +rightleft -ruby +scrollbind +signs +smartindent
-sniff +startuptime +statusline -sun_workshop +syntax +tag_binary
+tag_old_static -tag_any_white -tcl +terminfo +termresponse +textobjects +title
 +toolbar +user_commands +vertsplit +virtualedit +visual +visualextra +viminfo
+vreplace +wildignore +wildmenu +windows +writebackup +X11 -xfontset +xim
+xsmp_interact +xterm_clipboard -xterm_save
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
      user exrc file: "$HOME/.exrc"
  system gvimrc file: "$VIM/gvimrc"
    user gvimrc file: "$HOME/.gvimrc"
    system menu file: "$VIMRUNTIME/menu.vim"
  fall-back for $VIM: "/tmp/vim-testing/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK  -D_REENTRANT -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/directfb -I/usr/include/libpng14     -g -O2 -D_FORTIFY_SOURCE=1
Linking: gcc   -L/usr/local/lib -o vim   -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lgmodule-2.0 -lglib-2.0   -lXt -lm -lncurses -lacl -lgpm

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RE: Couple of 'conceal' quirks

Vince Negri-4
From: Benjamin R. Haskell [mailto:[hidden email]]


> Second thing I tried was:

> :syntax match Initial /^   / conceal cchar=^I
> (Pattern is '/^' + 3 spaces + '/', and ^I == ^V <Tab> [literal tab])

> Then text with leading spaces shows very odd refresh characteristics,
> and just generally doesn't display right.  

I wouldn't have expected using a tab as the conceal character to work
properly.. I'm fairly sure the code expects cchar to always occupy one
'cell'. It should go into the docs I think.

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