cmd/evm: add stdin support to blocktest command

[bshastry]

Enable blocktest to read filenames from stdin when no path argument is provided, matching the existing statetest behavior. This allows efficient batch processing of blockchain tests.

Usage:

• Single file: evm blocktest
• Batch mode: find tests/ -name "*.json" | evm blocktest

🤖 Generated with Claude Code

[MariusVanDerWijden]

The lint is red @bshastry

[MariusVanDerWijden]

Been looking a bit into this. Its seems the whole concept of EndMarker should be removed. What I guess you want is to write out the results between the traces not only at the end of the test, right? This should be possible with the traceResult struct. I will push a commit on top which changes this, we can remove it again if you don't agree

[bshastry]

Been looking a bit into this. Its seems the whole concept of EndMarker should be removed. What I guess you want is to write out the results between the traces not only at the end of the test, right? This should be possible with the traceResult struct. I will push a commit on top which changes this, we can remove it again if you don't agree

Yeah, basically I want a read protocol for jsonl that signals when blocktest results are complete, so I can break the jsonl scanner loop.

trace line 1 trace line 2

...
<- Scanner breaks on seeing end marker