pre-commit

#!/bin/bash
echo "Begin pre-commit hook"

REPO_ROOT="$(git rev-parse --show-toplevel)"

# Capture the staged file list BEFORE clearing git env vars below: the unset
# drops GIT_INDEX_FILE, which `git diff --cached` needs to read the right index
# (matters during rebase/merge/temp-index commits). Paths are repo-root-relative.
staged="$(git diff --cached --name-only --diff-filter=ACMR)"

# Git sets GIT_DIR/etc. for hook subprocesses; Flutter's bin/flutter
# uses `git describe` to detect its own SDK version and these vars
# point it at the wrong repo. Clear them before invoking Flutter.
unset GIT_DIR GIT_INDEX_FILE GIT_WORK_TREE GIT_PREFIX

# The Dart toolchain checks (analyze + dart fix) only matter when a Dart source
# changes. Skip them entirely otherwise (e.g. a YAML/CI/docs-only change) —
# running a full `flutter analyze` there is wasted.
if echo "$staged" | grep -q '\.dart$'; then
  # Prefer FVM Flutter if present; else try `fvm flutter`; else global flutter
  if [[ -x "$REPO_ROOT/.fvm/flutter_sdk/bin/flutter" ]]; then
    FLUTTER="$REPO_ROOT/.fvm/flutter_sdk/bin/flutter"
    DART="$REPO_ROOT/.fvm/flutter_sdk/bin/dart"
  elif command -v fvm >/dev/null 2>&1; then
    FLUTTER="fvm flutter"
    DART="fvm dart"
  else
    FLUTTER="flutter"
    DART="dart"
  fi

  echo "Using Flutter: $($FLUTTER --version | head -n1)"

  # Run analyze and dart fix in parallel; they are independent read-only checks.
  analyzeOut="$(mktemp)"
  fixOut="$(mktemp)"
  fmtOut="$(mktemp)"
  trap 'rm -f "$analyzeOut" "$fixOut" "$fmtOut"' EXIT

  start=$SECONDS

  make analyze >"$analyzeOut" 2>&1 &
  analyzePid=$!

  $DART fix --dry-run >"$fixOut" 2>&1 &
  fixPid=$!

  # Format check on staged Dart source only (check-only, like analyze/fix
  # above — never rewrites the working tree). Generated files are excluded so
  # regenerated output can't fail the commit: by suffix and by /generated/
  # path segment (drift schema snapshots). `dart format` ignores the analyzer's
  # `exclude:`, so the filter lives here — keep the regex in sync with the
  # format-check target in the makefile (which CI invokes). xargs -r no-ops when
  # the staged set is all-generated. Exits non-zero if any staged file is
  # unformatted. Batch inputs to keep each formatter process below the
  # operating system argument limit after code generation.
  # $DART is intentionally unquoted: the fallback sets DART="fvm dart" (two
  # words), and quoting it makes xargs exec a literal binary named "fvm dart"
  # (exit 127). Word splitting here matches the `$DART fix` call above.
  echo "$staged" | grep '\.dart$' | grep -vE '\.(g|freezed|gr|config|mocks|steps)\.dart$|/generated/' \
    | xargs -r -n 500 $DART format --output=none --set-exit-if-changed >"$fmtOut" 2>&1 &
  fmtPid=$!

  wait $analyzePid; analyzeExit=$?
  wait $fixPid;     fixExit=$?
  wait $fmtPid;     fmtExit=$?

  echo "analyze + dart fix + format took $((SECONDS - start))s (parallel)"

  if [ $analyzeExit -ne 0 ]; then
    cat "$analyzeOut"
    echo "Flutter analyze found issues, please fix them."
    exit 1
  fi

  if ! grep -q "Nothing to fix!" "$fixOut"; then
    cat "$fixOut"
    echo "dart fix has suggestions, run \`dart fix --apply\` and commit the result."
    exit 1
  fi

  if [ $fmtExit -ne 0 ]; then
    cat "$fmtOut"
    echo "dart format found unformatted staged files, run \`dart format .\` and commit the result."
    exit 1
  fi
else
  echo "No Dart/pub files staged — skipping analyze + dart fix + format."
fi

# bull_ui import boundary: feature UI built on the design system must import
# only `package:bull_ui/bull_ui.dart` for widgets — never Flutter UI directly.
# (Until a first-party analyzer rule lands, this grep is the enforcement.)
# Only relevant when files under the coins UI are staged.
if echo "$staged" | grep -q '^lib/features/coins/ui/'; then
  if grep -rEl "package:flutter/(material|cupertino|widgets)\.dart" "$REPO_ROOT/lib/features/coins/ui" >/dev/null 2>&1; then
    echo "lib/features/coins/ui must import only package:bull_ui/bull_ui.dart, not package:flutter/{material,cupertino,widgets}.dart:"
    grep -rEl "package:flutter/(material|cupertino|widgets)\.dart" "$REPO_ROOT/lib/features/coins/ui"
    exit 1
  fi
fi

echo "End pre-commit hook"