Rust code coverage script

coverage_report.sh

#!/bin/bash
#
# Prerequisites:
#     rustup component add llvm-tools-preview
#     cargo install rustfilt
#     jq
set -euo pipefail

TOOLS_DIR="$(rustc --print sysroot)/lib/rustlib/x86_64-unknown-linux-gnu/bin"

# Generate raw profile data (appears in individual crate directories)
RUSTFLAGS="-C instrument-coverage" LLVM_PROFILE_FILE="project-%m.profraw" cargo test --tests

# Create combined data file
PROFRAW_FILES=$(find . -name "*.profraw")
$TOOLS_DIR/llvm-profdata merge --sparse -o project.profdata $PROFRAW_FILES
rm -f $PROFRAW_FILES

PROFILED_FILES="$( \
      for file in \
        $( \
          RUSTFLAGS="-C instrument-coverage" \
            cargo test --tests --no-run --message-format=json \
              | jq -r "select(.profile.test == true) | .filenames[]" \
             | grep -v dSYM - \
        ); \
      do \
        printf "%s %s " --object=$file; \
      done \
    )"

$TOOLS_DIR/llvm-cov report \
  $PROFILED_FILES \
  --Xdemangler=rustfilt \
  --instr-profile=project.profdata \
  --ignore-filename-regex='/.cargo/registry'

$TOOLS_DIR/llvm-cov show \
  $PROFILED_FILES \
  --Xdemangler=rustfilt \
  --instr-profile=project.profdata \
  --ignore-filename-regex='/.cargo/registry' \
  --show-line-counts-or-regions \
  --show-instantiations \
  --format=html > coverage.html