Add svd2ir diff tests.

.github/ci/build.sh

@@ -0,0 +1,64 @@
+#!/bin/bash
+## on pull_request
+
+set -euxo pipefail
+
+export RUSTUP_HOME=/ci/cache/rustup
+export CARGO_HOME=/ci/cache/cargo
+export CARGO_TARGET_DIR=/ci/cache/target
+export RUST_BACKTRACE=1
+
+hashtime restore /ci/cache/filetime.json || true
+hashtime save /ci/cache/filetime.json
+
+# Fetch enough history to compute the merge-base with main.
+git remote add upstream https://github.com/embassy-rs/chiptool
+git fetch --depth 50 upstream main
+BASE=$(git merge-base HEAD upstream/main)
+BASE=0c94b6c4c43712a455d687d34c7200909203f2d9
+HEAD_SHA=$(git rev-parse HEAD)
+
+# Reuse cached SVDs clone across CI runs.
+mv /ci/cache/chiptool-test-svds tests/svds || true
+
+run_test() {
+    local out=$1
+    rm -rf tests/output
+    cargo test --test svd2ir
+    rm -rf "$out"
+    mv tests/output "$out"
+}
+
+# Generate YAMLs for HEAD.
+run_test /tmp/head
+
+# Generate YAMLs for the merge base.
+git -c advice.detachedHead=false checkout "$BASE"
+run_test /tmp/base
+git checkout -
+
+# Move cached SVDs back.
+mv tests/svds /ci/cache/chiptool-test-svds
+
+# Produce a colored HTML diff.
+mkdir -p /ci/artifacts
+(
+    cd /tmp
+    # `--no-index` lets us diff two trees outside any repo.
+    # exit code 1 just means "differences found"; that's fine.
+    git --no-pager diff --no-index --color=always base head > /tmp/diff.ansi || true
+)
+aha --black < /tmp/diff.ansi > /ci/artifacts/diff.html
+
+# Also publish the raw YAML trees so reviewers can browse / download them.
+cp -r /tmp/head /ci/artifacts/head
+cp -r /tmp/base /ci/artifacts/base
+
+JOB_ID=$(jq -r .id < /ci/job.json)
+cat > /ci/comment.md <<EOF
+chiptool svd2ir diff for commit \`$HEAD_SHA\` vs base \`$BASE\`:
+
+- [diff.html](https://ci.embassy.dev/jobs/$JOB_ID/artifacts/diff.html)
+- [head YAMLs](https://ci.embassy.dev/jobs/$JOB_ID/artifacts/head/)
+- [base YAMLs](https://ci.embassy.dev/jobs/$JOB_ID/artifacts/base/)
+EOF

.gitignore

@@ -3,3 +3,5 @@
 *.rs.bk
 target
 .DS_Store
+/tests/output
+/tests/svds