Merge branch 'from_bhenderson'

* from_bhenderson:
  Only set omnifunc when no configuration present
  Make setting of omnifunc conditional. Change strlen to len.
  Update README.
  Set omnifunc default for mail file types.
  Make query command default to mutt setting.
  Fix examples typo.

README

@@ -25,6 +25,7 @@ Setup:
 Settings:
   g:qcc_query_command
       External command that queries for contacts
+      default: `mutt -Q query_command`
 
   g:qcc_line_separator
       Separator for each entry in the result from the query

plugin/querycommandcomplete.vim

@@ -25,6 +25,7 @@
 " Settings:
 "   g:qcc_query_command
 "       External command that queries for contacts
+"       default: `mutt -Q query_command`
 "
 "   g:qcc_line_separator
 "       Separator for each entry in the result from the query
@@ -43,9 +44,18 @@ if exists("g:loaded_QueryCommandComplete") || &cp
   finish
 endif
 
+" use mutt query command as default
 if !exists("g:qcc_query_command")
-    echoerr "QueryCommandComplete: g:qcc_query_command not set!"
-    finish
+    let s:querycmd = system('mutt -Q query_command 2>/dev/null')
+    let s:querycmd = substitute(s:querycmd, '^query_command=\"\(.*\) .%s.\"\n', '\1','')
+
+    if len(s:querycmd)
+        let g:qcc_query_command = s:querycmd
+        autocmd FileType mail setlocal omnifunc=QueryCommandComplete
+    else
+        echoerr "QueryCommandComplete: g:qcc_query_command not set!"
+        finish
+    endif
 endif
 
 let g:loaded_QueryCommandComplete = 1