feat(azure): add `azure` plugin (#8848)

lib/prompt_info_functions.zsh

@@ -18,6 +18,7 @@ function chruby_prompt_info \
   vi_mode_prompt_info \
   virtualenv_prompt_info \
   jenv_prompt_info \
+  azure_prompt_info \
   tf_prompt_info \
 {
   return 1

plugins/azure/README.md

+# azure
+
+This plugin provides completion support for [azure cli](https://docs.microsoft.com/en-us/cli/azure/)
+and a few utilities to manage azure subscriptions and display them in the prompt.
+
+To use it, add `azure` to the plugins array in your zshrc file.
+
+```zsh
+plugins=(... azure)
+```
+
+## Plugin commands
+
+
+* `az_subscriptions`: lists the available subscriptions in the  `AZURE_CONFIG_DIR` (default: `~/.azure/`).
+  Used to provide completion for the `azss` function.
+
+* `azgs`: gets the current value of `$azure_subscription`.
+
+* `azss [<subscription>]`: sets the `$azure_subscription`.
+
+
+NOTE : because azure keeps the state of active subscription in ${AZURE_CONFIG_DIR:-$HOME/.azure/azureProfile.json}, the prompt command requires `jq` to be enabled to parse the file. If jq is not in the path the prompt will show nothing
+
+## Theme
+
+The plugin creates an `azure_prompt_info` function that you can use in your theme, which displays
+the current `$azure_subscription`. It uses two variables to control how that is shown:
+
+- ZSH_THEME_AZURE_PREFIX: sets the prefix of the azure_subscription. Defaults to `<az:`.
+
+- ZSH_THEME_azure_SUFFIX: sets the suffix of the azure_subscription. Defaults to `>`.
+
+
+```
+RPROMPT='$(azure_prompt_info)'
+```
+
+## Develop
+
+On ubuntu get a working environment with :
+
+` docker run -it -v $(pwd):/mnt -w /mnt ubuntu bash`
+
+```
+apt install -y curl jq zsh git vim
+sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
+curl -sL https://aka.ms/InstallAzureCLIDeb | bash
+```
\ No newline at end of file

plugins/azure/azure.plugin.zsh

+# AZ Get Subscritions
+function azgs() {
+  az account show --output tsv --query 'name' 2>/dev/null
+}
+
+# AZ Subscription Selection
+alias azss="az account set --subscription"
+
+
+function az_subscriptions() {
+  az account list  --all --output tsv --query '[*].name' 2> /dev/null
+}
+
+function _az_subscriptions() {
+  reply=($(az_subscriptions))
+}
+compctl -K _az_subscriptions azss
+
+# Azure prompt
+function azure_prompt_info() {
+  [[ ! -f "${AZURE_CONFIG_DIR:-$HOME/.azure/azureProfile.json}" ]] && return
+  # azgs is too expensive, if we have jq, we enable the prompt
+  (( $+commands[jq] )) || return 1
+  azgs=$(jq -r '.subscriptions[] | select(.isDefault==true) .name' ${AZURE_CONFIG_DIR:-$HOME/.azure/azureProfile.json})
+  echo "${ZSH_THEME_AZURE_PREFIX:=<az:}${azgs}${ZSH_THEME_AZURE_SUFFIX:=>}"
+}
+
+
+# Load az completions
+function _az-homebrew-installed() {
+  # check if Homebrew is installed
+  (( $+commands[brew] )) || return 1
+
+  # speculatively check default brew prefix
+  if [ -h /usr/local/opt/az ]; then
+    _brew_prefix=/usr/local/opt/az
+  else
+    # ok, it is not in the default prefix
+    # this call to brew is expensive (about 400 ms), so at least let's make it only once
+    _brew_prefix=$(brew --prefix azure-cli)
+  fi
+}
+
+
+# get az.completion.sh location from $PATH
+_az_zsh_completer_path="$commands[az_zsh_completer.sh]"
+
+# otherwise check common locations
+if [[ -z $_az_zsh_completer_path ]]; then
+  # Homebrew
+  if _az-homebrew-installed; then
+    _az_zsh_completer_path=$_brew_prefix/libexec/bin/az.completion.sh
+  # Linux
+  else
+    _az_zsh_completer_path=/etc/bash_completion.d/azure-cli
+  fi
+fi
+
+[[ -r $_az_zsh_completer_path ]] && source $_az_zsh_completer_path
+unset _az_zsh_completer_path _brew_prefix