Logging every autocommands events in the log file

log.vim

augroup EventLoggin
  autocmd!
  autocmd BufNewFile * call s:Log('BufNewFile')
  autocmd BufReadPre * call s:Log('BufReadPre')
  autocmd BufRead * call s:Log('BufRead')
  autocmd BufReadPost * call s:Log('BufReadPost')
  autocmd BufReadCmd * call s:Log('BufReadCmd')
  autocmd FileReadPre * call s:Log('FileReadPre')
  autocmd FileReadPost * call s:Log('FileReadPost')
  autocmd FileReadCmd * call s:Log('FileReadCmd')
  autocmd FilterReadPre * call s:Log('FilterReadPre')
  autocmd FilterReadPost * call s:Log('FilterReadPost')
  autocmd StdinReadPre * call s:Log('StdinReadPre')
  autocmd StdinReadPost * call s:Log('StdinReadPost')
  autocmd BufWrite * call s:Log('BufWrite')
  autocmd BufWritePre * call s:Log('BufWritePre')
  autocmd BufWritePost * call s:Log('BufWritePost')
  autocmd BufWriteCmd * call s:Log('BufWriteCmd')
  autocmd FileWritePre * call s:Log('FileWritePre')
  autocmd FileWritePost * call s:Log('FileWritePost')
  autocmd FileWriteCmd * call s:Log('FileWriteCmd')
  autocmd FileAppendPre * call s:Log('FileAppendPre')
  autocmd FileAppendPost * call s:Log('FileAppendPost')
  autocmd FileAppendCmd * call s:Log('FileAppendCmd')
  autocmd FilterWritePre * call s:Log('FilterWritePre')
  autocmd FilterWritePost * call s:Log('FilterWritePost')
  autocmd BufAdd * call s:Log('BufAdd')
  autocmd BufCreate * call s:Log('BufCreate')
  autocmd BufDelete * call s:Log('BufDelete')
  autocmd BufWipeout * call s:Log('BufWipeout')
  autocmd BufFilePre * call s:Log('BufFilePre')
  autocmd BufFilePost * call s:Log('BufFilePost')
  autocmd BufEnter * call s:Log('BufEnter')
  autocmd BufLeave * call s:Log('BufLeave')
  autocmd BufWinEnter * call s:Log('BufWinEnter')
  autocmd BufWinLeave * call s:Log('BufWinLeave')
  autocmd BufUnload * call s:Log('BufUnload')
  autocmd BufHidden * call s:Log('BufHidden')
  autocmd BufNew * call s:Log('BufNew')
  autocmd SwapExists * call s:Log('SwapExists')
  autocmd FileType * call s:Log('FileType')
  autocmd Syntax * call s:Log('Syntax')
  autocmd EncodingChanged * call s:Log('EncodingChanged')
  autocmd TermChanged * call s:Log('TermChanged')
  autocmd VimEnter * call s:Log('VimEnter')
  autocmd GUIEnter * call s:Log('GUIEnter')
  autocmd GUIFailed * call s:Log('GUIFailed')
  autocmd TermResponse * call s:Log('TermResponse')
  autocmd QuitPre * call s:Log('QuitPre')
  autocmd VimLeavePre * call s:Log('VimLeavePre')
  autocmd VimLeave * call s:Log('VimLeave')
  autocmd FileChangedShell * call s:Log('FileChangedShell')
  autocmd FileChangedShellPost * call s:Log('FileChangedShellPost')
  autocmd FileChangedRO * call s:Log('FileChangedRO')
  autocmd ShellCmdPost * call s:Log('ShellCmdPost')
  autocmd ShellFilterPost * call s:Log('ShellFilterPost')
  autocmd FuncUndefined * call s:Log('FuncUndefined')
  autocmd SpellFileMissing * call s:Log('SpellFileMissing')
  autocmd SourcePre * call s:Log('SourcePre')
  autocmd SourceCmd * call s:Log('SourceCmd')
  autocmd VimResized * call s:Log('VimResized')
  autocmd FocusGained * call s:Log('FocusGained')
  autocmd FocusLost * call s:Log('FocusLost')
  autocmd CursorHold * call s:Log('CursorHold')
  autocmd CursorHoldI * call s:Log('CursorHoldI')
  autocmd CursorMoved * call s:Log('CursorMoved')
  autocmd CursorMovedI * call s:Log('CursorMovedI')
  autocmd WinEnter * call s:Log('WinEnter')
  autocmd WinLeave * call s:Log('WinLeave')
  autocmd TabEnter * call s:Log('TabEnter')
  autocmd TabLeave * call s:Log('TabLeave')
  autocmd CmdwinEnter * call s:Log('CmdwinEnter')
  autocmd CmdwinLeave * call s:Log('CmdwinLeave')
  autocmd InsertEnter * call s:Log('InsertEnter')
  autocmd InsertChange * call s:Log('InsertChange')
  autocmd InsertLeave * call s:Log('InsertLeave')
  autocmd InsertCharPre * call s:Log('InsertCharPre')
  autocmd TextChanged * call s:Log('TextChanged')
  autocmd TextChangedI * call s:Log('TextChangedI')
  autocmd ColorScheme * call s:Log('ColorScheme')
  autocmd RemoteReply * call s:Log('RemoteReply')
  autocmd QuickFixCmdPre * call s:Log('QuickFixCmdPre')
  autocmd QuickFixCmdPost * call s:Log('QuickFixCmdPost')
  autocmd SessionLoadPost * call s:Log('SessionLoadPost')
  autocmd MenuPopup * call s:Log('MenuPopup')
  autocmd CompleteDone * call s:Log('CompleteDone')
  autocmd User * call s:Log('User')
augroup END

function! s:Log(eventName) abort
  silent execute '!echo '.a:eventName.' >> log'
endfunction