copilot-powerline 0.13.0

#!/usr/bin/env bash
# Runs cargo-mutants on the lines this branch changes. The CI Mutants job
# runs this same script, so a local run and CI agree. Usage:
#   scripts/mutants-diff [base]   # base defaults to origin/main
# MUTANTS_JOBS sets the parallel jobs (default 4). Exits non-zero when a
# mutant survives or cargo-mutants fails (timeout, broken baseline).
set -euo pipefail

base="${1:-origin/main}"
root="$(git rev-parse --show-toplevel)"
cd "$root"

# The diff is taken from commits, so uncommitted edits and new files would
# go untested.
if [ -n "$(git status --porcelain)" ]; then
  echo "mutants-diff: commit or stash your changes first; only committed changes are diffed" >&2
  exit 1
fi

# A stale copy of a remote base would put the base's own newer commits in
# the diff.
case "$base" in
  origin/*) git fetch --quiet origin "${base#origin/}" ;;
esac

out="$root/target/mutants-diff"
mkdir -p "$out" "$root/target/mutants-home"
git diff "$base...HEAD" > "$out/pr.diff"

# A throwaway HOME keeps mutants away from the real ~/.copilot and cache
# dir. It sits under target/, outside the system temp dir, because a test
# keeps caches out of the temp dir. rustup must still find its toolchains.
rustup_home="${RUSTUP_HOME:-$HOME/.rustup}"
cargo_home="${CARGO_HOME:-$HOME/.cargo}"
RUSTUP_HOME="$rustup_home" CARGO_HOME="$cargo_home" HOME="$root/target/mutants-home" \
  "${CARGO:-cargo}" mutants --in-diff "$out/pr.diff" --test-tool nextest \
  --no-shuffle -j "${MUTANTS_JOBS:-4}"