Set callback slot to 0 before executing script #694

	name: snapshot gas

	on:
	workflow_dispatch:
	pull_request:

	env:
	FOUNDRY_PROFILE: ci

	jobs:
	snapshot-gas:
	name: Diff against gas snapshot
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	with:
	submodules: recursive

	- name: Install Foundry
	uses: foundry-rs/foundry-toolchain@v1
	with:
	version: "nightly-de33b6af53005037b463318d2628b5cfcaf39916"

	- name: Install dependencies
	run: forge install

	- name: Diff gas snapshot against baseline
	run: \|
	set -euo pipefail
	# grep -E '^test' -- skip over test results, just get diffs
	forge snapshot --via-ir --diff \
	\| grep -E '^test' \
	\| tee .gas-snapshot.new
	env:
	NODE_PROVIDER_BYPASS_KEY: ${{ secrets.NODE_PROVIDER_BYPASS_KEY }}

	- name: Check diff tolerance
	run: \|
	set -euo pipefail
	# 1. skip over diffs of 0 gas (do not fail if no matches)
	# 2. skip over negative diffs (do not fail if no matches)
	# 3. remove ANSI color / style escape sequences
	# 4. extract absolute (not percentage) gas diffs
	# 5. pluck any diffs that exceed an absolute tolerance threshold
	# and exit non-zero (failure) if any such diff is found
	{ grep -Ev 'gas: 0' .gas-snapshot.new \|\| true; } \
	\| { grep -Ev '\-[0-9]+' \|\| true; } \
	\| sed -Ee 's/\x1b\[[0-9;]*m//g' \
	-Ee 's/(.+) \(gas: ([0-9]+).+/\1 \2/' \
	\| awk '{ if ($2 > ENVIRON["GAS_DIFF_THRESHOLD"]) { print; failures++ } } END { if (failures > 0) { print $failures; exit 1 } else { print "ok." } }'
	env:
	# gas diff check should fail if any gas diff exceeds threshold
	GAS_DIFF_THRESHOLD: 5000

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