[Bug]: Elixir: calls inside one-line function bodies (def f(x), do: g(x)) are never collected #4207

Pre-flight checks

• I have checked the Troubleshooting section in the README

What happened?

While working on a project, I found that calls inside keyword-form function bodies are missing from the graph. def a(x), do: b(x) produces the node a(), but no calls edge to b(), even though b is defined in the same module. One-line definitions are idiomatic Elixir (delegating wrappers, guards, small helpers), so a real code base loses a large share of its local call edges.

Where it happens (v8, graphify/extractors/elixir.py)

A function body is registered for walk_calls only when the definition has a do_block child (L252-253, if do_block_node: function_bodies.append(...)). The keyword form , do: expr has no do_block node. Its body is the value of the do: pair in the call's arguments keywords, so it is never walked.

Suggested fix

When a def/defp/defmacro/… has no do_block, take the value of the do: keyword in its arguments as the body and walk it the same way. The same applies to else:/rescue: keywords if they are handled for block bodies.

Steps to reproduce

mkdir -p repro2/lib && cd repro2
cat > lib/short.ex <<'EOF'
defmodule App.Short do
  def a(x), do: b(x)

  def b(x) do
    x
  end
end
EOF
uvx --python 3.13 --from graphifyy==0.9.80 graphify extract lib --code-only --no-cluster --out out
python3 -c "
import json
g = json.load(open('out/graphify-out/graph.json'))
print([(e['source'], e['target']) for e in g['edges'] if e['relation'] == 'calls'])
"

Error output or graph output

[]
expected: [('app_short_app_short_a', 'app_short_app_short_b')]

Graphify version

0.9.80

Operating System

macOS

Python Version

3.13

Installation Method

uv tool install (recommended)

Additional Environment Details

No provider environment variables set (--code-only, no LLM). Reproduced in a fresh directory containing only the four files above.

Additional context

No response