Add basic gcp-ps1

plugins/gcp-ps1/README.md

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+# gcp prompt for zsh
+
+Prompt which displays current configuration
+
+## Current state
+
+Tested only on ubuntu.
+May or may not work on FreeBSD or osX. Feel free to fix any issue!
+
+## Requirements
+
+[gcloud](https://cloud.google.com/sdk/docs/downloads-interactive)
+
+
+## Enabling
+
+In order to use gcp-ps1 with Oh My Zsh, you'll need to enable them in the
+.zshrc file. You'll find the zshrc file in your $HOME directory. 
+
+```shell
+vim $HOME/.zshrc
+```
+
+Add gcp-ps1 to the list of enabled plugins and enable it on the prompt:
+
+```shell
+plugins=(
+  git
+  gcp-ps1
+)
+
+PROMPT=$PROMPT'$(gcp_ps1) '
+```
+

plugins/gcp-ps1/gcp-ps1.plugin.zsh

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+#!/bin/zsh
+
+# GCP prompt helper for zsh
+# ported to oh-my-zsh
+# Displays current configuration
+#
+# Author: Marcin Niemira
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Debug
+[[ -n $DEBUG ]] && set -x
+
+setopt PROMPT_SUBST
+autoload -U add-zsh-hook
+add-zsh-hook precmd _gcp_ps1_update_cache
+
+
+GCP_PS1_COLOR_SYMBOL="%{$fg[blue]%}"
+GCP_PS1_COLOR_NS="%{$fg[cyan]%}"
+
+_gcp_ps1_symbol() {
+  echo "☁️  "
+}
+
+_gcp_ps1_update_cache() {
+  CONTEXT=$(cat "$HOME/.config/gcloud/active_config")
+}
+
+gcp_ps1 () {
+  local reset_color="%{$reset_color%}"
+
+  GCP_PS1="${reset_color}("
+  GCP_PS1+="$(_gcp_ps1_symbol)"
+  GCP_PS1+="${GCP_PS1_COLOR_SYMBOL}$CONTEXT${reset_color}"
+  GCP_PS1+=")${reset_color}"
+
+  echo "${GCP_PS1}"
+}