Terravision hangs in resolve_all_variables() when source is tfdata.json (stuck in strip_var_curlies)

[ClementV78]

Summary

Terravision hangs during variable resolution when using a tfdata.json source. The process spins CPU and never reaches rendering. Stack trace shows it looping in:
modules/interpreter.py -> find_replace_values -> helpers.strip_var_curlies

Environment

• Terravision: 0.10.2 (pipx)
• Python: 3.12.3
• Terraform: 1.13.2
• OS: Linux (Ubuntu/Debian based)

Repro steps

1. Generate a tfdata.json with debug:
   terravision draw --source /path/to/terraform --debug
2. Try to render from the JSON:
   terravision draw --source /path/to/tfdata.json --format png --outfile /tmp/out.png

Observed

• CPU stays high, no output file produced.
• No Graphviz processes running (dot/neato/gvpr).
• Faulthandler trace shows loop in:
  modules/helpers.py: strip_var_curlies
  modules/interpreter.py: find_replace_values

Expected

Rendering should complete from tfdata.json without re-running variable resolution.

Workaround

Bypass Terravision CLI and call drawing.render_diagram() directly using the venv python:

• Load tfdata.json
• Ensure provider_detection exists
• Call drawing.render_diagram(tfdata, False, False, outfile, format, source)
  This produces the output immediately.

Notes

The hang happens before Graphviz, during _enrich_graph_data() / resolve_all_variables().

Current thread 0x00007eafe6fc1080 (most recent call first):
  File ".../site-packages/modules/helpers.py", line 1161, in strip_var_curlies
  File ".../site-packages/modules/interpreter.py", line 483, in find_replace_values
  File ".../site-packages/modules/interpreter.py", line 165, in handle_metadata_vars
  File ".../site-packages/modules/interpreter.py", line 43, in resolve_all_variables
  File ".../site-packages/terravision/terravision.py", line 167, in _enrich_graph_data
  File ".../site-packages/terravision/terravision.py", line 249, in compile_tfdata
  File ".../site-packages/terravision/terravision.py", line 633, in draw

[patrickchugh]

@ClementV78 Can you try with the latest version of the code I just pushed?