diff --git a/.travis.yml b/.travis.yml
index 2885bc5..e1a56a6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,17 @@ before_script:
     - git clone https://github.com/thinca/vim-themis --branch v1.4 --depth 1 /tmp/vim-themis
     - vim --version
 
+    - git clone https://github.com/vim/vim.git /tmp/vim
+    - git clone https://github.com/vim-jp/vital.vim.git /tmp/vital.vim
+    - git clone https://github.com/thinca/vim-quickrun.git /tmp/quickrun
+    - git clone https://github.com/Shougo/neocomplete.vim.git /tmp/neocom
+    - git clone https://github.com/easymotion/vim-easymotion.git /tmp/em
+    - git clone https://github.com/tpope/vim-fugitive /tmp/fug
+    - git clone https://github.com/scrooloose/syntastic /tmp/syntastic
+    - git clone https://github.com/itchyny/lightline.vim.git /tmp/ll
+    - git clone https://github.com/ctrlpvim/ctrlp.vim /tmp/cp
+    - git clone https://github.com/vim-airline/vim-airline.git /tmp/al
+
 script:
     - rm -f /tmp/vimlint_test.log
     - vim -c 'set rtp+=.,/tmp/vimlparser' -c 'source test/vimlint-test.vim' -c 'call Vimlint_test("test", "/tmp/vimlint_test.log")' -c 'qall!'
@@ -13,3 +24,16 @@ script:
     - sh ./bin/vimlint.sh -p /tmp/vimlparser -v autoload
     - sh ./test/err.sh -p /tmp/vimlparser test/test-ok.vim test/test-ng.vim
     - /tmp/vim-themis/bin/themis themis
+
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 /tmp/vim/runtime/autoload /tmp/vim/runtime/plugin
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 -c func_abort=1 /tmp/vital.vim/autoload
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 -c func_abort=1 /tmp/quickrun/autoload
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 -c func_abort=1 /tmp/neocom/autoload
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 -c func_abort=1 /tmp/em/autoload
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 /tmp/fug/plugin
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 /tmp/syntastic/autoload /tmp/syntastic/plugin
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 -c func_abort=1 /tmp/ll/autoload
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 /tmp/cp/autoload /tmp/cp/plugin
+    - sh ./bin/vimlint.sh -X -p /tmp/vimlparser  -e EVL103=1 -e EVL102.l:_=1 /tmp/al/autoload /tmp/al/plugin
+
+
diff --git a/autoload/vimlint.vim b/autoload/vimlint.vim
index 4249422..0b37784 100644
--- a/autoload/vimlint.vim
+++ b/autoload/vimlint.vim
@@ -71,6 +71,8 @@ let s:default_errlevel.EVL204 = s:DEF_NON
 let s:default_errlevel.EVL205 = s:DEF_WRN
 let s:default_errlevel.EVL206 = s:DEF_NON
 let s:default_errlevel.EVL207 = s:DEF_NON
+let s:default_errlevel.EVL301 = s:DEF_NON
+let s:default_errlevel.EVL302 = s:DEF_NON
 let s:default_errlevel.EVL901 = s:DEF_WRN
 let s:default_errlevel.EVL902 = s:DEF_WRN
 let s:def_var_name = ':'
@@ -130,7 +132,7 @@ function! s:extend_errlevel(param) abort " {{{
   for key in keys(s:default_errlevel)
 "   echo "param[" . key . "]"
     if !has_key(param, key)
-      call s:set_param(param, key, s:DEF_ERR, s:def_var_name)
+      call s:set_param(param, key, key[3] == '3' ? s:DEF_WRN : s:DEF_ERR, s:def_var_name)
     elseif type(param[key]) == type(0)
       call s:set_param(param, key, param[key], s:def_var_name)
     elseif type(param[key]) != type({})
@@ -657,7 +659,7 @@ function! s:reconstruct_varstack_rt(self, env, pos, brk_cont, nop) abort " {{{
         if v.type ==# 'append' && v.v.ref == 0 && a:env.global.fins == 0
           " 変数を追加したが参照していない
           " かつ,  finally 句がない場合
-          call a:self.error_mes(v.node, 'EVL102', 'unused variable2 `' . v.var. '`', v.var)
+          call a:self.error_mes(v.node, 'EVL102', 'unused variable2 `' . v.var . '`', v.var)
         endif
         let a:env.varstack[j] = nop
       endfor
@@ -842,6 +844,40 @@ function! s:reconstruct_varstack_st(self, env, p) abort " {{{
 endfunction " }}}
 " @vimlint(EVL103, 0, a:self)
 
+function! s:VimlLint.abbrev_if(vl, node) abort " {{{
+  for node in a:node.elseif
+    call a:vl.abbrev_common(node)
+  endfor
+  if a:node.else isnot s:vlp.NIL
+    call a:vl.abbrev_common(a:node.else)
+  endif
+  call a:vl.abbrev_common(a:node.endif)
+endfunction " }}}
+function! s:VimlLint.abbrev_for(vl, node) abort " {{{
+  call a:vl.abbrev_common(a:node.endfor)
+endfunction " }}}
+function! s:VimlLint.abbrev_while(vl, node) abort " {{{
+  call a:vl.abbrev_common(a:node.endwhile)
+endfunction " }}}
+function! s:VimlLint.abbrev_try(vl, node) abort " {{{
+  for node in a:node.catch
+    call a:vl.abbrev_common(node)
+  endfor
+  if a:node.finally isnot s:vlp.NIL
+    call a:vl.abbrev_common(a:node.finally)
+  endif
+  call a:vl.abbrev_common(a:node.endtry)
+endfunction " }}}
+function! s:VimlLint.abbrev_func(vl, node) abort " {{{
+  call a:vl.abbrev_common(a:node.endfunction)
+endfunction " }}}
+function! s:VimlLint.abbrev_common(node) abort " {{{
+  let line = self.lines[a:node.pos.lnum - 1]
+  if match(line, '^' . a:node.ea.cmd.name . '\>', a:node.pos.col - 1) < 0
+      call self.error_mes(a:node, 'EVL302', 'use the full command name `' . a:node.ea.cmd.name . '` instead of the abbreviation', a:node)
+  endif
+endfunction " }}}
+
 function s:VimlLint.compile(node, refchk) abort " {{{
   if type(a:node) ==# type({}) && has_key(a:node, 'type')
     if a:node.type != 2 && g:vimlint#debug > 2 || g:vimlint#debug >= 5
@@ -859,6 +895,14 @@ function s:VimlLint.compile(node, refchk) abort " {{{
   "   echo a:node
   "   throw "stop"
   " endtry
+  if has_key(a:node, 'ea')
+    if has_key(self.excmd_abbrev, a:node.type)
+      call self.excmd_abbrev[a:node.type](self, a:node)
+    elseif has_key(a:node.ea.cmd, 'name')
+      call self.abbrev_common(a:node)
+    endif
+  endif
+
 
   return call(self.compile_funcs[a:node.type], [a:node, a:refchk], self)
 
@@ -1670,7 +1714,15 @@ function s:VimlLint.compile_subtract(node, ...) abort
 endfunction
 
 function s:VimlLint.compile_concat(node, ...) abort
-  return self.compile_op2(a:node, '.')
+  let r = self.compile_op2(a:node, '.')
+  " google style guide. use spaces around operators
+  let line = self.lines[r.pos.lnum - 1]
+  if line[r.pos.col - 2] !~# '\s' || len(line) > r.pos.col && line[r.pos.col] !~# '\s'
+    if self.filename !=# ''
+      call self.error_mes(r, 'EVL301', 'use space around operator `.`', r)
+    endif
+  endif
+  return r
 endfunction
 
 function s:VimlLint.compile_multiply(node, ...) abort
@@ -1736,6 +1788,7 @@ function s:VimlLint.parse_string(str, node, cmd, ref) abort "{{{
       " @TODO 今は変数の中身は参照していないので適当に代入可能
     endif
     let r = s:vlp.StringReader.new(lines)
+    let c.lines = lines
     call c.compile(p.parse(r), 1)
   catch
     call self.error_mes(a:node, 'EVL203', 'parse error in `' . a:cmd . '`', 1)
@@ -1948,9 +2001,12 @@ function! s:vimlint_file(filename, param, progress) abort " {{{
     if a:param.type ==# 'string'
         let r = s:vlp.StringReader.new(vimfile)
         let c.filename = ''
+        let c.lines = split(vimfile, "\n")
     else
-        let r = s:vlp.StringReader.new(readfile(vimfile))
+        let l = readfile(vimfile)
+        let r = s:vlp.StringReader.new(l)
         let c.filename = vimfile
+        let c.lines = l
     endif
 
 
@@ -2219,6 +2275,13 @@ let s:VimlLint.compile_funcs[s:vlp.NODE_CURLYNAME] = s:VimlLint.compile_curlynam
 let s:VimlLint.compile_funcs[s:vlp.NODE_ENV] = s:VimlLint.compile_env
 let s:VimlLint.compile_funcs[s:vlp.NODE_REG] = s:VimlLint.compile_reg
 
+let s:VimlLint.excmd_abbrev = {}
+let s:VimlLint.excmd_abbrev[s:vlp.NODE_IF] = s:VimlLint.abbrev_if
+let s:VimlLint.excmd_abbrev[s:vlp.NODE_FOR] = s:VimlLint.abbrev_for
+let s:VimlLint.excmd_abbrev[s:vlp.NODE_WHILE] = s:VimlLint.abbrev_while
+let s:VimlLint.excmd_abbrev[s:vlp.NODE_TRY] = s:VimlLint.abbrev_try
+let s:VimlLint.excmd_abbrev[s:vlp.NODE_FUNCTION] = s:VimlLint.abbrev_func
+
 let &cpo = s:save_cpo
 unlet s:save_cpo
 
diff --git a/bin/vimlint.sh b/bin/vimlint.sh
index a9efc8c..c316dad 100755
--- a/bin/vimlint.sh
+++ b/bin/vimlint.sh
@@ -34,7 +34,7 @@ VOPT="-c 'set rtp+=`pwd`'"
 echo "call has_key(g:, \"vimlint#config\") | let g:vimlint#config = {}" > ${VF}
 echo "let g:vimlint#config.quiet = 1" >> ${VF}
 ERRGREP='Error|Warning'
-while getopts 'hl:p:ue:vc:E' OPT; do
+while getopts 'hl:p:ue:vc:EX' OPT; do
 	case "$OPT" in
 	p)
 		if [ ! -f "${OPTARG}/autoload/vimlparser.vim" ]; then
@@ -52,6 +52,8 @@ while getopts 'hl:p:ue:vc:E' OPT; do
 		VOPT="$VOPT -u NONE -i NONE" ;;
 	E)
 		ERRGREP='Error' ;;
+	X)
+		ERRGREP='vimlint#vimlint' ;;  # Exception
 	e)
 		if [ `echo ${OPTARG} | grep '^EVL[0-9]\+=[135]$' | wc -l` = 1 ]; then
 			E=`echo ${OPTARG} | sed 's/=.*//'`
diff --git a/doc/vimlint.txt b/doc/vimlint.txt
index e23b758..98c8cec 100644
--- a/doc/vimlint.txt
+++ b/doc/vimlint.txt
@@ -344,6 +344,13 @@ EVL206: `v` can be used for `x`					*EVL206*
 
 EVL207: statement with no effect				*EVL207*
 
+
+style
+EVL301: use space around operator `x`				*EVL301*
+								*EVL302*
+EVL302: use the full command name `x` instead of the abbreviation
+
+
 system error
 EVL901: unknown type `t`					*EVL901*
 EVL902: assert error `t`					*EVL902*
diff --git a/test/concat1.vim b/test/concat1.vim
new file mode 100644
index 0000000..62c8bf4
--- /dev/null
+++ b/test/concat1.vim
@@ -0,0 +1,5 @@
+" @ERR ["WVL301"]
+function! Hoge()
+  return 'a'. bo()
+endfunction
+
diff --git a/test/concat2.vim b/test/concat2.vim
new file mode 100644
index 0000000..dd57ac6
--- /dev/null
+++ b/test/concat2.vim
@@ -0,0 +1,5 @@
+" @ERR ["WVL301"]
+function! Hoge()
+  return 'qoo'. 'foo'
+endfunction
+
diff --git a/test/concat3.vim b/test/concat3.vim
new file mode 100644
index 0000000..efc68e7
--- /dev/null
+++ b/test/concat3.vim
@@ -0,0 +1,5 @@
+" @ERR []
+function! Hoge()
+  return 'a' . bo()
+endfunction
+
diff --git a/test/concat4.vim b/test/concat4.vim
new file mode 100644
index 0000000..e6283e2
--- /dev/null
+++ b/test/concat4.vim
@@ -0,0 +1,5 @@
+" @ERR ["WVL301"]
+function! Hoge()
+  return 'qoo'.
+\'foo'
+endfunction