Vim: :doautocmd trap

00-reproduce.sh

rm -f *.log
vim -u NONE -i NONE -N -c 'source case-1.vim'
vim -u NONE -i NONE -N -c 'source case-2.vim'

01-answer

According to :help :autocmd --

> After applying the autocommands the modelines are
> processed, so that their settings overrule the
> settings from autocommands, like what happens when
> editing a file.

... is this behavior really useful?
Processing modelines should be restricted while opening files, shouldn't it?

case-1.log

line 8: set updatetime=1
line 9: 
line 10: quit

case-1.vim

filetype plugin indent on
autocmd FileType *  echo 'FileType is triggered.'

edit foo

set verbosefile=case-1.log
set verbose=99
set updatetime=1

quit

case-2.log

line 8: set updatetime=1
line 9: 
line 10: doautocmd User This_doautocmd_should_do_nothing_but_triggers_FileType_event.
No matching autocommands
Executing FileType Auto commands for "*"
autocommand call s:LoadFTPlugin()

line 0: call s:LoadFTPlugin()
calling function <SNR>3_LoadFTPlugin()

line 1:     if exists("b:undo_ftplugin")
line 2:       exe b:undo_ftplugin
line 2: setlocal cms< | unlet! b:browsefilter b:match_words
line 2:  unlet! b:browsefilter b:match_words
line 3:       unlet! b:undo_ftplugin b:did_ftplugin
line 4:     endif
line 5: 
line 6:     let s = expand("<amatch>")
line 7:     if s != ""
line 8:       if &cpo =~# "S" && exists("b:did_ftplugin")
line 9: ^I" In compatible mode options are reset to the global values, need to
line 10: ^I" set the local values also when a plugin was already used.
line 11: ^Iunlet b:did_ftplugin
line 12:       endif
line 13: 
line 14:       " When there is a dot it is used to separate filetype names.  Thus for
line 15:       " "aaa.bbb" load "aaa" and then "bbb".
line 16:       for name in split(s, '\.')
line 17: ^Iexe 'runtime! ftplugin/' . name . '.vim ftplugin/' . name . '_*.vim ftplugin/' . name . '/*.vim'
line 17: runtime! ftplugin/sh.vim ftplugin/sh_*.vim ftplugin/sh/*.vim
Searching for "ftplugin/sh.vim ftplugin/sh_*.vim ftplugin/sh/*.vim" in "/Users/kana/.vim,/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles,/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73,/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/after,/Users/kana/.vim/after"
Searching for "/Users/kana/.vim/ftplugin/sh.vim"
Searching for "/Users/kana/.vim/ftplugin/sh_*.vim"
Searching for "/Users/kana/.vim/ftplugin/sh/*.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/ftplugin/sh.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/ftplugin/sh_*.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/ftplugin/sh/*.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/ftplugin/sh.vim"
chdir(/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/ftplugin)
fchdir() to previous dir
line 17: sourcing "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/ftplugin/sh.vim"
line 1: " Vim filetype plugin file
line 2: " Language:^Ish
line 3: " Maintainer:^IDan Sharp <dwsharp at users dot sourceforge dot net>
line 4: " Last Changed: 20 Jan 2009
line 5: " URL:^I^Ihttp://dwsharp.users.sourceforge.net/vim/ftplugin
line 6: 
line 7: if exists("b:did_ftplugin") | finish | endif
line 7:  finish | endif
line 7:  endif
line 8: let b:did_ftplugin = 1
line 9: 
line 10: " Make sure the continuation lines below do not cause problems in
line 11: " compatibility mode.
line 12: let s:save_cpo = &cpo
line 13: set cpo-=C
line 14: 
line 15: setlocal commentstring=#%s
line 16: 
line 17: " Shell:  thanks to Johannes Zellner
line 18: if exists("loaded_matchit")
line 19:     let s:sol = '\%(;\s*\|^\s*\)\@<='  " start of line
line 23:     let b:match_words = s:sol.'if\>:' . s:sol.'elif\>:' . s:sol.'else\>:' . s:sol. 'fi\>,' . s:sol.'\%(for\|while\)\>:' . s:sol. 'done\>,' . s:sol.'case\>:' . s:sol. 'esac\>'
line 24: endif
line 25: 
line 26: " Change the :browse e filter to primarily show shell-related files.
line 27: if has("gui_win32")
line 31:     let  b:browsefilter="Bourne Shell Scripts (*.sh)\t*.sh\n" .^I"Korn Shell Scripts (*.ksh)\t*.ksh\n" .^I"Bash Shell Scripts (*.bash)\t*.bash\n" .^I"All Files (*.*)\t*.*\n"
line 32: endif
line 33: 
line 34: " Undo the stuff we changed.
line 35: let b:undo_ftplugin = "setlocal cms< | unlet! b:browsefilter b:match_words"
line 36: 
line 37: " Restore the saved compatibility options.
line 38: let &cpo = s:save_cpo
finished sourcing /Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/ftplugin/sh.vim
continuing in function <SNR>3_LoadFTPlugin
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/ftplugin/sh_*.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/ftplugin/sh/*.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/after/ftplugin/sh.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/after/ftplugin/sh_*.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/after/ftplugin/sh/*.vim"
Searching for "/Users/kana/.vim/after/ftplugin/sh.vim"
Searching for "/Users/kana/.vim/after/ftplugin/sh_*.vim"
Searching for "/Users/kana/.vim/after/ftplugin/sh/*.vim"
line 18:       endfor
line 16:       for name in split(s, '\.')
line 17: ^Iexe 'runtime! ftplugin/' . name . '.vim ftplugin/' . name . '_*.vim ftplugin/' . name . '/*.vim'
line 18:       endfor
line 19:     endif
function <SNR>3_LoadFTPlugin returning #0

continuing in FileType Auto commands for "*"

Executing FileType Auto commands for "*"
autocommand call s:LoadIndent()

line 0: call s:LoadIndent()
calling function <SNR>4_LoadIndent()

line 1:     if exists("b:undo_indent")
line 2:       exe b:undo_indent
line 3:       unlet! b:undo_indent b:did_indent
line 4:     endif
line 5:     let s = expand("<amatch>")
line 6:     if s != ""
line 7:       if exists("b:did_indent")
line 8: ^Iunlet b:did_indent
line 9:       endif
line 10: 
line 11:       " When there is a dot it is used to separate filetype names.  Thus for
line 12:       " "aaa.bbb" load "indent/aaa.vim" and then "indent/bbb.vim".
line 13:       for name in split(s, '\.')
line 14: ^Iexe 'runtime! indent/' . name . '.vim'
line 14: runtime! indent/sh.vim
Searching for "indent/sh.vim" in "/Users/kana/.vim,/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles,/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73,/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/after,/Users/kana/.vim/after"
Searching for "/Users/kana/.vim/indent/sh.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/indent/sh.vim"
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/indent/sh.vim"
chdir(/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/indent)
fchdir() to previous dir
line 14: sourcing "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/indent/sh.vim"
line 1: " Vim indent file
line 2: " Language:         Shell Script
line 3: " Maintainer:       Nikolai Weibull <[email protected]>
line 4: " Latest Revision:  2010-01-06
line 5: 
line 6: if exists("b:did_indent")
line 7:   finish
line 8: endif
line 9: let b:did_indent = 1
line 10: 
line 11: setlocal indentexpr=GetShIndent()
line 12: setlocal indentkeys+=0=then,0=do,0=else,0=elif,0=fi,0=esac,0=done,),0=;;,0=;&
line 13: setlocal indentkeys+=0=fin,0=fil,0=fip,0=fir,0=fix
line 14: setlocal indentkeys-=:,0#
line 15: setlocal nosmartindent
line 16: 
line 17: if exists("*GetShIndent")
line 18:   finish
finished sourcing /Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vim73/indent/sh.vim
continuing in function <SNR>4_LoadIndent
Searching for "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim/vimfiles/after/indent/sh.vim"
Searching for "/Users/kana/.vim/after/indent/sh.vim"
line 15:       endfor
line 13:       for name in split(s, '\.')
line 14: ^Iexe 'runtime! indent/' . name . '.vim'
line 15:       endfor
line 16:     endif
function <SNR>4_LoadIndent returning #0

continuing in FileType Auto commands for "*"

Executing FileType Auto commands for "*"
autocommand echo 'FileType is triggered.'

line 0: echo 'FileType is triggered.'
FileType is triggered.
line 11: 
line 12: quit

case-2.vim

filetype plugin indent on
autocmd FileType *  echo 'FileType is triggered.'

edit foo

set verbosefile=case-2.log
set verbose=99
set updatetime=1

doautocmd User This_doautocmd_should_do_nothing_but_triggers_FileType_event.

quit

foo

vim: filetype=sh

vim-version

VIM - Vi IMproved 7.3 (2010 Aug 15, compiled Nov  6 2011 14:30:13)
MacOS X (unix) version
Included patches: 1-353
Compiled by kana@avril
Huge version without 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 +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 -lua +menu +mksession +modify_fname +mouse -mouseshape 
+mouse_dec -mouse_gpm -mouse_jsbterm +mouse_netterm -mouse_sysmouse 
+mouse_xterm +mouse_urxvt +multi_byte +multi_lang -mzscheme -netbeans_intg 
+path_extra -perl +persistent_undo +postscript +printer +profile -python 
-python3 +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
 -xterm_clipboard -xterm_save 
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
      user exrc file: "$HOME/.exrc"
  fall-back for $VIM: "/Users/kana/.vvm/vims/vimorg--v7-3-353/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H   -DMACOS_X_UNIX -no-cpp-precomp  -g -O -D_FORTIFY_SOURCE=1      
Linking: gcc   -L/usr/local/lib -o vim       -lm -lncurses  -liconv -framework Cocoa