Clean up build_coverage.sh to run all steps in sequence

Simplifies the script to automatically compile, run (60s), and generate
the coverage report in a single invocation. Removes the two-step --report
flag approach and adds quieter output with clear step markers.

build_coverage.sh

@@ -1,40 +1,37 @@
 #!/bin/bash
 set -e
 
-# Build simulation with branch coverage instrumentation
+SIMULATION_BINARY="toasty_simulation_coverage"
-gcc src/sha256.c src/basic.c src/file_system.c src/byte_queue.c src/file_tree.c src/message.c src/tcp.c src/wal.c src/hash_set.c src/client.c src/metadata_server.c src/chunk_server.c src/random_client.c src/main.c quakey/src/lfs.c quakey/src/lfs_util.c quakey/src/quakey.c -o toasty_simulation_coverage -Iquakey/include -Iinclude -Wall -Wextra -ggdb -O0 -DMAIN_SIMULATION --coverage -fprofile-arcs -ftest-coverage
+RUN_DURATION=60
+COVERAGE_DIR="coverage_html"
+
+echo "=== Step 1: Building simulation with coverage instrumentation ==="
+gcc src/sha256.c src/basic.c src/file_system.c src/byte_queue.c src/file_tree.c \
+    src/message.c src/tcp.c src/wal.c src/hash_set.c src/client.c \
+    src/metadata_server.c src/chunk_server.c src/random_client.c src/main.c \
+    quakey/src/lfs.c quakey/src/lfs_util.c quakey/src/quakey.c \
+    -o "$SIMULATION_BINARY" \
+    -Iquakey/include -Iinclude \
+    -Wall -Wextra -ggdb -O0 \
+    -DMAIN_SIMULATION \
+    --coverage -fprofile-arcs -ftest-coverage
+echo "Build complete: $SIMULATION_BINARY"
 
-echo "Coverage build complete: toasty_simulation_coverage"
 echo ""
-echo "To generate HTML coverage report:"
+echo "=== Step 2: Running simulation for ${RUN_DURATION}s ==="
-echo "  1. Run: ./toasty_simulation_coverage"
+lcov --zerocounters --directory . --quiet
-echo "  2. Run: ./build_coverage.sh --report"
+lcov --capture --initial --directory . --output-file coverage_base.info --rc lcov_branch_coverage=1 --quiet
+timeout --signal=INT --kill-after=5 "$RUN_DURATION" "./$SIMULATION_BINARY" || true
+echo "Simulation finished"
 
-if [ "$1" = "--report" ]; then
+echo ""
-    # Reset previous coverage data
+echo "=== Step 3: Generating coverage report ==="
-    lcov --zerocounters --directory .
+lcov --capture --directory . --output-file coverage_test.info --rc lcov_branch_coverage=1 --quiet
+lcov --add-tracefile coverage_base.info --add-tracefile coverage_test.info --output-file coverage.info --rc lcov_branch_coverage=1 --quiet
+lcov --remove coverage.info '/usr/*' 'quakey/*' --output-file coverage.info --rc lcov_branch_coverage=1 --quiet
+genhtml coverage.info --output-directory "$COVERAGE_DIR" --branch-coverage --quiet
+rm -f coverage_base.info coverage_test.info
 
-    # Capture baseline coverage (before running)
+echo ""
-    lcov --capture --initial --directory . --output-file coverage_base.info --rc lcov_branch_coverage=1
+echo "=== Done ==="
-
+echo "Coverage report: $COVERAGE_DIR/index.html"
-    # Run the simulation with a 60 second time limit
-    # Use SIGINT for graceful shutdown (allows coverage data to be flushed)
-    # Falls back to SIGKILL after 5 seconds if process doesn't exit
-    echo "Running simulation (60 second limit)..."
-    timeout --signal=INT --kill-after=5 60 ./toasty_simulation_coverage || true
-
-    # Capture coverage after running
-    lcov --capture --directory . --output-file coverage_test.info --rc lcov_branch_coverage=1
-
-    # Combine baseline and test coverage
-    lcov --add-tracefile coverage_base.info --add-tracefile coverage_test.info --output-file coverage.info --rc lcov_branch_coverage=1
-
-    # Remove external/system headers from report
-    lcov --remove coverage.info '/usr/*' --output-file coverage.info --rc lcov_branch_coverage=1
-
-    # Generate HTML report
-    genhtml coverage.info --output-directory coverage_html --branch-coverage
-
-    echo ""
-    echo "HTML coverage report generated in: coverage_html/index.html"
-fi