enable almostontop plugin

almostontop plugin description https://github.com/Valiev/almostontop/blob/master/README.md

plugins/almostontop/README.md

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+# almostontop
+
+## Description
+almostontop zsh plugin. It clears previous command output every time before new command
+executed in shell. Insipred by [`alwaysontop`](https://github.com/swirepe/alwaysontop) plugin for bash
+
+## Usage
+source `almostontop.plugin.zsh` file and enjoy!
+
+[![asciicast](https://asciinema.org/a/8rkdwvnp7atjseesp7n74nsyr.png)](https://asciinema.org/a/8rkdwvnp7atjseesp7n74nsyr)
+
+## Author
+[Sergey Valiev](https://github.com/Valiev)

plugins/almostontop/almostontop.plugin.zsh

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+if [ "x$ALMOSONTOP" = "xfalse" ]; then
+  # doing nothing here
+else
+  ALMOSONTOP=true
+fi
+
+function almostontop_preexec
+{
+  if [ "x$ALMOSONTOP" = "xtrue" ]; then
+    clear
+    # print PROMPT and command itself on the top
+    echo "$(print -P $prompt)$fg[green]${(z)1}$reset_color"
+  fi
+}
+
+autoload -U add-zsh-hook
+add-zsh-hook preexec almostontop_preexec
+
+function almostontop
+{
+  # Help message if there no args
+  if [ $# -eq 0 ]; then
+    almostontop_usage
+  fi
+
+  local arg=$1
+  if [ "x$arg" = "xon" ]; then
+    ALMOSONTOP=true
+  fi
+
+  if [ "x$arg" = "xoff" ]; then
+    ALMOSONTOP=false
+  fi
+
+  if [ "x$arg" = "xtoggle" ]; then
+    if [ "x$ALMOSONTOP" = "xtrue" ]; then
+      almostontop off
+    else
+      almostontop on
+    fi
+  fi
+}
+
+function almostontop_usage
+{
+  cat <<-EOF
+Usage: almostontop <command>
+
+Commands:
+  on     Enables almostontop plugin
+  off    Disables almostontop plugin
+  toggle Toggles almostontop plugin
+
+Description:
+  almostontop clears previous command output every time before new command
+  executed in shell. Insipred by 'alwaysontop' plugin for bash:
+  https://github.com/swirepe/alwaysontop
+EOF
+}