diff --git a/contrib/completion/zsh/_docker b/contrib/completion/zsh/_docker
index 6d17bb21b3..4fc8dcb21e 100644
--- a/contrib/completion/zsh/_docker
+++ b/contrib/completion/zsh/_docker
@@ -45,18 +45,18 @@ __docker_get_containers() {
     shift
     [[ $kind = (stopped|all) ]] && args=($args -a)
 
-    lines=(${(f)"$(_call_program commands docker $docker_options ps ${args})"})
+    lines=(${(f)"$(_call_program commands docker $docker_options ps $args)"})
 
     # Parse header line to find columns
     local i=1 j=1 k header=${lines[1]}
     declare -A begin end
-    while (( $j < ${#header} - 1 )) {
-        i=$(( $j + ${${header[$j,-1]}[(i)[^ ]]} - 1))
-        j=$(( $i + ${${header[$i,-1]}[(i)  ]} - 1))
-        k=$(( $j + ${${header[$j,-1]}[(i)[^ ]]} - 2))
-        begin[${header[$i,$(($j-1))]}]=$i
-        end[${header[$i,$(($j-1))]}]=$k
-    }
+    while (( j < ${#header} - 1 )); do
+        i=$(( j + ${${header[$j,-1]}[(i)[^ ]]} - 1 ))
+        j=$(( i + ${${header[$i,-1]}[(i)  ]} - 1 ))
+        k=$(( j + ${${header[$j,-1]}[(i)[^ ]]} - 2 ))
+        begin[${header[$i,$((j-1))]}]=$i
+        end[${header[$i,$((j-1))]}]=$k
+    done
     lines=(${lines[2,-1]})
 
     # Container ID
@@ -65,7 +65,7 @@ __docker_get_containers() {
     for line in $lines; do
         s="${line[${begin[CONTAINER ID]},${end[CONTAINER ID]}]%% ##}"
         s="$s:${(l:15:: :::)${${line[${begin[CREATED]},${end[CREATED]}]/ ago/}%% ##}}"
-        s="$s, ${${${line[$begin[IMAGE],$end[IMAGE]]}/:/\\:}%% ##}"
+        s="$s, ${${${line[${begin[IMAGE]},${end[IMAGE]}]}/:/\\:}%% ##}"
         if [[ ${line[${begin[STATUS]},${end[STATUS]}]} = Exit* ]]; then
             stopped=($stopped $s)
         else
@@ -80,7 +80,7 @@ __docker_get_containers() {
         names=(${(ps:,:)${${line[${begin[NAMES]},-1]}%% *}})
         for name in $names; do
             s="${name}:${(l:15:: :::)${${line[${begin[CREATED]},${end[CREATED]}]/ ago/}%% ##}}"
-            s="$s, ${${${line[$begin[IMAGE],$end[IMAGE]]}/:/\\:}%% ##}"
+            s="$s, ${${${line[${begin[IMAGE]},${end[IMAGE]}]}/:/\\:}%% ##}"
             if [[ ${line[${begin[STATUS]},${end[STATUS]}]} = Exit* ]]; then
                 stopped=($stopped $s)
             else
@@ -101,11 +101,11 @@ __docker_runningcontainers() {
     __docker_get_containers running "$@"
 }
 
-__docker_containers () {
+__docker_containers() {
     __docker_get_containers all "$@"
 }
 
-__docker_images () {
+__docker_images() {
     local expl
     declare -a images
     images=(${${${${(f)"$(_call_program commands docker $docker_options images)"}[2,-1]}/ ##/\\:}%% *})
@@ -151,21 +151,20 @@ __docker_search() {
     _wanted dockersearch expl 'available images' compadd -a result
 }
 
-__docker_caching_policy()
-{
-  oldp=( "$1"(Nmh+1) )     # 1 hour
-  (( $#oldp ))
+__docker_caching_policy() {
+  oldp=( "$1(Nmh+1)" )     # 1 hour
+  (( ${#oldp} ))
 }
 
 
-__docker_repositories () {
+__docker_repositories() {
     local expl
     declare -a repos
     repos=(${${${(f)"$(_call_program commands docker $docker_options images)"}%% *}[2,-1]})
     _describe -t docker-repos "repositories" repos "$@"
 }
 
-__docker_commands () {
+__docker_commands() {
     # local -a  _docker_subcommands
     local cache_policy
 
@@ -186,7 +185,7 @@ __docker_commands () {
     _describe -t docker-commands "docker command" _docker_subcommands
 }
 
-__docker_subcommand () {
+__docker_subcommand() {
     local -a _command_args
     case "$words[1]" in
         (attach)
@@ -577,9 +576,9 @@ __docker_subcommand () {
             ;;
         (tag)
             _arguments \
-                '(-f --force)'{-f,--force}'[force]'\
+                '(-f --force)'{-f,--force}'[force]' \
                 '(- :)--help[Print usage]' \
-                ':image:__docker_images'\
+                ':image:__docker_images' \
                 ':repository:__docker_repositories_with_tags' && ret=0
             ;;
         (top)
@@ -608,7 +607,7 @@ __docker_subcommand () {
 
 }
 
-_docker () {
+_docker() {
     # Support for subservices, which allows for `compdef _docker docker-shell=_docker_containers`.
     # Based on /usr/share/zsh/functions/Completion/Unix/_git without support for `ret`.
     if [[ $service != docker ]]; then
@@ -616,8 +615,9 @@ _docker () {
         return
     fi
 
-    local curcontext="$curcontext" state line ret=1
+    local curcontext="$curcontext" state line
     typeset -A opt_args
+    integer ret=1
 
     _arguments -C \
         '--api-cors-header=-[Set CORS headers in the remote API]:CORS headers: ' \
@@ -637,7 +637,7 @@ _docker () {
         '--fixed-cidr-v6=-[IPv6 subnet for fixed IPs]:IPv6 subnet: ' \
         '(-G --group)'{-G,--group=-}'[Group for the unix socket (default: docker)]:group:_groups' \
         '(-g --graph)'{-g,--graph=-}'[Root of the Docker runtime (default: /var/lib/docker)]:PATH:_directories' \
-        '(-H --host)'{-H,--host=-}'[tcp://host:port to bind/connect to]:socket: ' \
+        '(-H --host)'{-H,--host=-}'[tcp://host:port to bind/connect to]:host: ' \
         '(-h --help)'{-h,--help}'[Print usage]' \
         '--icc[Enable inter-container communication]' \
         '*--insecure-registry=-[Enable insecure registry communication]:registry: ' \
@@ -666,10 +666,6 @@ _docker () {
         '(-): :->command' \
         '(-)*:: :->option-or-argument' && ret=0
 
-    if (( CURRENT == 1 )); then
-
-    fi
-
     local counter=1
     while [ $counter -lt ${#words} ]; do
         case "${words[$counter]}" in