add docker-hosts plugin

plugins/docker-hosts/LICENSE

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+MIT License
+
+Copyright (c) 2016 Buck Brady
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

plugins/docker-hosts/README.md

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+### docker-hosts
+
+docker hosts is a simple zsh plugin to make managing multiple docker hosts easily.
+
+#### Usage
+
+dh-init: initializes the plugin dir and files for use
+
+dh-add (nickname) (host IP/FQDN): adds a host with a nickname to the hosts list
+
+dh-delete (nickname/IP/FQDN): removes the given host from the list
+
+dh-list: shows all hosts in the hostlist
+
+dh-set (nickname): sets the $DOCKER_HOST variable to the given host
+
+dh-set-default (nickname): sets the host that will be automaticly loaded on shell startup
+
+dh-current: shows the current $DOCKER_HOST vaule
+
+dh-clear: clears the DOCKER_HOST and allows docker to connect to localhost

plugins/docker-hosts/docker-host.plugin.zsh

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+# MIT License
+#
+# Copyright (c) 2016 Buck Brady
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+# initilizes the plugin dir
+function dh-init() {
+  if [ ! -d ~/.docker-hosts ]
+  then
+    mkdir -p ~/.docker-hosts
+    touch ~/.docker-hosts/hosts
+    touch ~/.docker-hosts/default
+    printf "docker-host plugin intialized.\n"
+  fi
+}
+
+# lists all hosts in hosts file
+function dh-list() {
+  dh-init
+  printf '%-20s  %s\n' '-- Nickname --' '-- Host IP/FQDN --'
+  awk -F',' '{printf "%-20s  %s\n", $1, $2}' \
+    $HOME/.docker-hosts/hosts | grep -v "#"
+}
+
+# adds host to hostfile
+function dh-add() {
+  dh-init
+  echo "$1,$2" >> ~/.docker-hosts/hosts
+  printf 'Host "%s" added with IP/FQDN "%s"\n' $1 $2
+}
+
+# removes host from host file
+function dh-remove() {
+  mv $HOME/.docker-hosts/hosts $HOME/.docker-hosts/hosts.old
+  grep -vw "$1" $HOME/.docker-hosts/hosts.old > $HOME/.docker-hosts/hosts
+  rm -f $HOME/.docker-hosts/hosts.old
+}
+
+# sets $DOCKER_HOST to given host in hostfile
+function dh-set() {
+  dh-init
+  host=`grep -w $1 $HOME/.docker-hosts/hosts | awk -F',' '{print $2}'`
+  export DOCKER_HOST=tcp://$host
+}
+
+# loads the default host
+function dh-get-default() {
+  host=`cat $HOME/.docker-hosts/default`
+  export DOCKER_HOST=tcp://$host
+}
+
+# sets host to be loaded as the default
+function dh-set-default() {
+  grep -w $1 $HOME/.docker-hosts/hosts \
+    | awk -F',' '{print $2}' > $HOME/.docker-hosts/default
+}
+
+# list the current docker host
+function dh-current() {
+  printf 'Current Docker Host: %s\n' $DOCKER_HOST
+}
+
+# clears the $DOCKER_HOST env
+function dh-clear() {
+  export DOCKER_HOST=''
+  print 'DOCKER_HOST is now empty, docker will try to connect to localhost socket.'
+}
+
+# load plugin
+dh-init
+dh-get-default