Terrible No Good OneLiner to Add / Remove Quotation marks from terraform files

add_remove_terraform_quotes

# It should go without saying, but make sure your terraform file is checked into version control before running this.
# If you find a bug, please let me know =)

# Add quotation marks
elixir -e 'Enum.each(Path.wildcard("**/*.tf"), fn filename -> File.read!(filename) |> String.split("\n") |> Enum.map(fn line -> arraylist = line |> String.trim() |> String.split(" ") |> Enum.map(fn s -> to_charlist(s) end); case arraylist do; [a, b, c, [123]] when a in [[114,101,115,111,117,114,99,101], [100,97,116,97], [112,114,111,118,105,100,101,114], [98,97,99,107,101,110,100]] -> [a,32,34,b,34,32,34,c,34,32,123,10]; _ -> line <> "\n"; end; end) |> to_string() |> String.trim() |> (&(File.write!(filename, &1))).() end)'


# Remove quotation marks from "resource", "data", "provider", and "backend" lines
elixir -e 'Enum.each(Path.wildcard("**/*.tf"), fn filename -> File.read!(filename) |> String.split("\n") |> Enum.map(fn line -> arraylist = line |> String.trim() |> String.split(" ") |> Enum.map(fn s -> to_charlist(s) end); case arraylist do; [a, b, c, [123]] when a in [[114,101,115,111,117,114,99,101], [100,97,116,97], [112,114,111,118,105,100,101,114], [98,97,99,107,101,110,100]] -> [a,32,b,32,c,32,123,10] |> List.flatten() |> Enum.reject(fn n -> n == 34 end); _ -> line <> "\n"; end; end) |> to_string() |> String.trim() |> (&(File.write!(filename, &1))).() end)'
 

terraform_snake_case.exs

#!/usr/bin/env elixir

# terraform_snake_case.exs
# Usage: run in terraform workspace. 
# Make sure to perform a git commit before and after running. 

# Function to convert kebab-case to snake_case
conv = fn s ->
  Regex.replace(~r/-(\w)/, s, fn _, c -> "_" <> c end)
end

# First pass: Build the name map
name_map = Enum.reduce(Path.wildcard("**/*.tf"), %{}, fn filename, acc ->
  lines = File.read!(filename) |> String.split("\n")

  Enum.reduce(lines, acc, fn line, map ->
    arraylist = line |> String.trim() |> String.split(" ")

    case arraylist do
      [a, resource_type, name | _] when a in ["resource", "data"] ->
        stripped_resource_type = String.trim(resource_type, "\"")
        stripped_name = String.trim(name, "\"")
        Map.put(map, {stripped_resource_type, stripped_name}, conv.(stripped_name))
      ["output", name | _] ->
        stripped_name = String.trim(name, "\"")
        Map.put(map, {"output", stripped_name}, conv.(stripped_name))

      _ -> map
    end
  end)
end)

# After constructing name_map
# IO.inspect(name_map, label: "Debug: Contents of name_map")

# Function to replace Terraform-specific references
replace_tf_refs = fn line, map ->
  matches = Regex.scan(~r/([\w-]+)\.([\w-]+)\.[\w-]+\b/, line)
  
  Enum.reduce(matches, line, fn match, acc ->
    [_, r, n] = match
    new_n = Map.get(map, {r, n}, n)  # Default to original name if not found in map
    
    # Replace all occurrences of this specific match in the accumulator
    String.replace(acc, "#{r}.#{n}.", "#{r}.#{new_n}.")
  end)
end




# Second pass: Update the files
Enum.each(Path.wildcard("**/*.tf"), fn filename ->
  lines = File.read!(filename) |> String.split("\n")

  new_lines = Enum.map(lines, fn line ->
    arraylist = line |> String.trim() |> String.split(" ")

    case arraylist do
      [a, resource_type, name | _] when a in ["resource", "data"] ->
        stripped_resource_type = String.trim(resource_type, "\"")
        stripped_name = String.trim(name, "\"")
        new_name = Map.get(name_map, {stripped_resource_type, stripped_name}, stripped_name)
        "#{a} #{resource_type} \"#{new_name}\" {"

      ["output", name | _] ->
        stripped_name = String.trim(name, "\"")
        new_name = Map.get(name_map, {"output", stripped_name}, stripped_name)
        "output \"#{new_name}\" {"

      _ ->
        # Replace other references using the name_map
        replace_tf_refs.(line, name_map)
    end
  end)

  # Write the new lines back to the file
  File.write!(filename, Enum.join(new_lines, "\n"))
end)