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let CLI accept input from STDIN #417

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42 changes: 31 additions & 11 deletions src/cf2tf/app.py
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Original file line number Diff line number Diff line change
@@ -1,9 +1,12 @@
import logging
import sys
from pathlib import Path
from typing import Optional

import click
import click_log
import yaml # type: ignore
from cfn_tools import dump_yaml, load_yaml # type: ignore

import cf2tf.save
from cf2tf.cloudformation import Template
Expand All @@ -18,30 +21,47 @@
@click.version_option()
@click.option("--output", "-o", type=click.Path(exists=False))
@click_log.simple_verbosity_option(log)
@click.argument("template_path", type=click.Path(exists=True))
def cli(output: Optional[str], template_path: str):
@click.argument("template_path", type=click.Path(exists=True), required=False)
def cli(output: Optional[str], template_path: Optional[str]):
"""Convert Cloudformation template into Terraform.

Args:
template_path (str): The path to the cloudformation template
template_path (str): The path to the cloudformation template.
If not provided, reads from STDIN.
"""

# Need to take this path and parse the cloudformation file
tmpl_path = Path(template_path)

# Where/how we will write the results
output_writer = cf2tf.save.create_writer(output)

log.info(f"// Converting {tmpl_path.name} to Terraform!")
log.debug(f"// Template location is {tmpl_path}")

cf_template = Template.from_yaml(tmpl_path).template
# Handle input from file or STDIN
if template_path:
# Need to take this path and parse the cloudformation file
tmpl_path = Path(template_path)
template_name = tmpl_path.stem

log.info(f"// Converting {tmpl_path.name} to Terraform!")
log.debug(f"// Template location is {tmpl_path}")

cf_template = Template.from_yaml(tmpl_path).template
else:
# Read from STDIN
template_name = "stdin"

log.info("// Converting template from STDIN to Terraform!")
log.debug("// Reading template from STDIN")

raw = sys.stdin.read()
tmp_yaml = load_yaml(raw)
tmp_str = dump_yaml(tmp_yaml)
template_dict = yaml.load(tmp_str, Loader=yaml.FullLoader)

cf_template = Template(template_dict).template

# Need to get the code from the repo
search_manger = code.search_manager()

# Turn Cloudformation template into a Terraform configuration
config = TemplateConverter(tmpl_path.stem, cf_template, search_manger).convert()
config = TemplateConverter(template_name, cf_template, search_manger).convert()

# Save this configuration to disc
config.save(output_writer)
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