Fix zsh autocomplete script

Fix completion when argument startswith `-`
Merged in upstream urfave/cli#1062

Signed-off-by: Shengjing Zhu <zhsj@debian.org>

contrib/autocomplete/ctr

@@ -1,5 +1,5 @@
 #! /bin/bash
-## This file is a direct copy of https://github.com/urfave/cli/blob/a221e662f14fd7404302444a5c4293409a401210/autocomplete/bash_autocomplete
+## This file is a direct copy of https://github.com/urfave/cli/blob/d04c0883fcc8860836ab30ade0fd29afa194ab23/autocomplete/bash_autocomplete
 
 : ${PROG:=$(basename ${BASH_SOURCE})}
 

contrib/autocomplete/zsh_autocomplete

@@ -1,13 +1,21 @@
 #compdef ctr
-# This file is a direct copy of https://github.com/urfave/cli/blob/a221e662f14fd7404302444a5c4293409a401210/autocomplete/zsh_autocomplete
+# This file is a direct copy of https://github.com/urfave/cli/blob/d04c0883fcc8860836ab30ade0fd29afa194ab23/autocomplete/zsh_autocomplete
 # With $PROG changed to ctr
 
 _cli_zsh_autocomplete() {
 
   local -a opts
-  opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} --generate-bash-completion)}")
+  local cur
+  cur=${words[-1]}
+  if [[ "$cur" == "-"* ]]; then
+    opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} ${cur} --generate-bash-completion)}")
+  else
+    opts=("${(@f)$(_CLI_ZSH_AUTOCOMPLETE_HACK=1 ${words[@]:0:#words[@]-1} --generate-bash-completion)}")
+  fi
 
-  _describe 'values' opts
+  if [[ "${opts[1]}" != "" ]]; then
+    _describe 'values' opts
+  fi
 
   return
 }