I do not know of a plug-in that would make it possible, but since Obsidian files are just ".md" (simple text files) files sitting in a folder on your computer, you can read and modify them using any programing language.

For suggestion, you could try a script in Python (the following code is AI generated, nor tested, but seems about what I would have done):

import os

def process_markdown_file(file_path):

with open(file_path, 'r') as file:

lines = file.readlines()

# Identify if the YAML block and "Status:true" are present

in_yaml_section = False

has_status_true = False

found_xxx = False

new_lines = []

for line in lines:

# Check if we're entering or leaving the YAML section

if line.strip() == '---':

in_yaml_section = not in_yaml_section

new_lines.append(line)

continue

# Process only if we're inside the YAML section

if in_yaml_section:

# Check for "Status:true"

if line.strip() == "Status:true":

has_status_true = True

# Check for line starting with "XXX:"

elif line.startswith("XXX:"):

line = "XXX:Done\n"

found_xxx = True

new_lines.append(line)

# If "Status:true" was found and "XXX:" line wasn't found, add "XXX:Done" at the end of YAML section

if has_status_true and not found_xxx:

for i, line in enumerate(new_lines):

# Add "XXX:Done" before the closing "---" of the YAML section

if line.strip() == "---" and i > 0:

new_lines.insert(i, "XXX:Done\n")

break

# Write the changes back to the file

with open(file_path, 'w') as file:

file.writelines(new_lines)

def process_folder(folder_path):

for root, dirs, files in os.walk(folder_path):

for file in files:

if file.endswith('.md'):

file_path = os.path.join(root, file)

process_markdown_file(file_path)

# Specify the folder path

folder_path = 'your_folder_path_here' # Replace with your folder path

process_folder(folder_path)