Summary of tfchanges using a plan file and jq

tfchanges.sh

#!/bin/bash

# Exit immediately if any command fails.
set -e
# Treat any non-zero exit status in a pipeline as an error.
set -o pipefail
# Make unset variables an error.
set -u

# --- Configuration ---
# The path to the Terraform plan file.  Change this if needed.
PLAN_FILE="/tmp/plan.out"

# --- Functions ---

# Get ANSI color codes using tput (most portable method).
get_color() {
  case "$1" in
  red) tput setaf 1 ;;
  green) tput setaf 2 ;;
  yellow) tput setaf 3 ;;
  cyan) tput setaf 6 ;;
  blue) tput setaf 4 ;; # Keep this, might use it elsewhere in future.
  white) tput setaf 7 ;;
  reset) tput sgr0 ;;
  *)
    echo "Invalid color name: $1" >&2
    exit 1
    ;;
  esac
}

# --- Main Script ---

# Check if the plan file exists.
if [[ ! -f "$PLAN_FILE" ]]; then
  echo "Error: Plan file not found: $PLAN_FILE" >&2
  exit 1
fi

# Check that terraform is installed
if ! command -v terraform &>/dev/null; then
  echo "terraform could not be found"
  exit
fi

#Check jq is installed.
if ! command -v jq &>/dev/null; then
  echo "jq could not be found"
  exit
fi

# --- Generate the detailed, colorized output ---

terraform show -json "$PLAN_FILE" | jq -r --arg red "$(get_color red)" --arg green "$(get_color green)" --arg yellow "$(get_color yellow)" --arg cyan "$(get_color cyan)" --arg white "$(get_color white)" --arg reset "$(get_color reset)" '
  .resource_changes[] |
  select(.change.actions | any(. != "no-op")) |
  [
    (
      if .change.actions | any(. == "create") and any(. == "delete") then ($cyan + "±" + $reset)
      elif .change.actions | any(. == "create") then ($green + "+" + $reset)
      elif .change.actions | any(. == "delete") then ($red + "-" + $reset)
      elif .change.actions | any(. == "update") then ($yellow + "~" + $reset)
      else ($white + "." + $reset)
      end
    ),
    "|",
    .address
  ] |
  join(" ")
'

# --- Calculate and display the summary ---

summary=$(terraform show -json "$PLAN_FILE" | jq -r --arg red "$(get_color red)" --arg green "$(get_color green)" --arg yellow "$(get_color yellow)" --arg reset "$(get_color reset)" '
  reduce .resource_changes[] as $change (
    { create: 0, update: 0, delete: 0 };  # Initial state
    . as $counts |  # Store the current state in $counts
    $change.change.actions as $actions |
      if   $actions | any(. == "create") and any(. == "delete") then .create += 1 | .delete += 1
      elif $actions | any(. == "create") then .create += 1
      elif $actions | any(. == "delete") then .delete += 1
      elif $actions | any(. == "update") then .update += 1
      else .
      end
  ) |
  [
    ("Added:    " + ($green + (.create | tostring) + $reset)),
    ("Changed:  " + ($yellow  + (.update | tostring) + $reset)), # Changed to yellow
    ("Deleted:  " + ($red   + (.delete | tostring) + $reset))
  ] |
  .[]
')

# Display Summary
echo "----------"
echo "$summary"

exit 0