Add envy plugin for easy profile switching

plugins/envy/README.md

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+# envy - oh-my-zsh plugin
+
+Easily switch between shell profiles using one command.
+
+Profiles are simple files just like .bashrc or .zshrc, located in separate directory. You can load them on demand, any time you want.
+
+[![asciicast](https://asciinema.org/a/brayiwehsfqt5gg5dzse28p38.png)](https://asciinema.org/a/brayiwehsfqt5gg5dzse28p38)
+
+## Usage
+
+Create first profile by executing `envy create work`. This will put empty file under `$HOME/.envy/work`. You can put there aliases, environment variables, functions or any shell logic.
+
+To load profile -- `envy work`.
+
+By default, when loading zsh envy loads `default` profile if it finds it.
+
+## Options
+
+You can customize envy by putting these env vars in .zshrc (or .bashrc):
+
+* `ENVY_CONFIG_DIR` - directory which contains profile files (default: $HOME/.envy)
+* `ENVY_DEFAULT_ENV` - profile to be loaded when zsh starts (default: default)

plugins/envy/envy.plugin.zsh

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+ENVY_CONFIG_DIR="${ENVY_CONFIG_DIR:-${HOME}/.envy}"
+ENVY_DEFAULT_ENV="${ENVY_DEFAULT_ENV:-default}"
+
+function _envy_start() {
+	_envy_load ${ENVY_DEFAULT_ENV} &>/dev/null || true
+}
+
+function _envy_load() {
+	local new_env_path="${ENVY_CONFIG_DIR}/${1}"
+
+	if [[ ! -f ${new_env_path} ]]; then
+		echo "Cannot find envy file '${new_env_path}'"
+		return 1
+	fi
+
+	source ${new_env_path}
+}
+
+function _envy_create() {
+	local new_env_path="${ENVY_CONFIG_DIR}/${1}"
+
+	[[ -z "${1}" ]] && echo "No profile name argument" && return 1
+	[[ ! -d "${ENVY_CONFIG_DIR}" ]] && mkdir -p ${ENVY_CONFIG_DIR}
+	echo "#!/bin/bash" > ${new_env_path}
+	echo "Created empty profile: ${new_env_path}"
+}
+
+function envy() {
+	case "${1}" in
+		create)
+			_envy_create ${2}
+			;;
+
+		*)
+			_envy_load ${1}
+	esac
+}
+
+_envy_start