1#!/usr/bin/env bash
  2#
  3# setup-hooks.sh - Configure Claude Code hooks to use Nix-built binaries
  4#
  5# This script updates ~/.claude/settings.json to reference the correct
  6# hook binaries from the Nix store (via PATH).
  7#
  8# Usage:
  9#   ./setup-hooks.sh              # Update settings.json
 10#   ./setup-hooks.sh --dry-run    # Show what would be changed
 11
 12set -euo pipefail
 13
 14SETTINGS_FILE="${HOME}/.claude/settings.json"
 15SETTINGS_BACKUP="${HOME}/.claude/settings.json.backup"
 16
 17# Determine if this is a dry run
 18DRY_RUN=false
 19if [[ "${1:-}" == "--dry-run" ]]; then
 20    DRY_RUN=true
 21fi
 22
 23# Check if settings.json exists
 24if [[ ! -f "$SETTINGS_FILE" ]]; then
 25    echo "Error: $SETTINGS_FILE does not exist"
 26    echo "Please create it first or run Claude Code to initialize it"
 27    exit 1
 28fi
 29
 30# Backup existing settings
 31if [[ "$DRY_RUN" == false ]]; then
 32    cp "$SETTINGS_FILE" "$SETTINGS_BACKUP"
 33    echo "Backed up existing settings to: $SETTINGS_BACKUP"
 34fi
 35
 36# Read current settings
 37CURRENT_SETTINGS=$(cat "$SETTINGS_FILE")
 38
 39# Build new hooks configuration
 40# Note: The binaries should be in PATH after installing via Nix
 41NEW_HOOKS=$(cat <<'EOF'
 42{
 43  "hooks": [
 44    {
 45      "type": "command",
 46      "command": "claude-hooks-initialize-session"
 47    }
 48  ]
 49}
 50EOF
 51)
 52
 53POST_TOOL_HOOKS=$(cat <<'EOF'
 54{
 55  "hooks": [
 56    {
 57      "type": "command",
 58      "command": "claude-hooks-capture-tool-output"
 59    }
 60  ]
 61}
 62EOF
 63)
 64
 65SESSION_END_HOOKS=$(cat <<'EOF'
 66{
 67  "hooks": [
 68    {
 69      "type": "command",
 70      "command": "claude-hooks-save-session"
 71    }
 72  ]
 73}
 74EOF
 75)
 76
 77# Use jq to update the settings.json with proper JSON merging
 78UPDATED_SETTINGS=$(echo "$CURRENT_SETTINGS" | jq --argjson sessionStart "$NEW_HOOKS" \
 79    --argjson postTool "$POST_TOOL_HOOKS" \
 80    --argjson sessionEnd "$SESSION_END_HOOKS" \
 81    '.hooks.SessionStart = [$sessionStart] | .hooks.PostToolUse = [$postTool] | .hooks.SessionEnd = [$sessionEnd]')
 82
 83if [[ "$DRY_RUN" == true ]]; then
 84    echo "=== DRY RUN - No changes made ==="
 85    echo ""
 86    echo "Would update $SETTINGS_FILE with:"
 87    echo "$UPDATED_SETTINGS" | jq '.'
 88    echo ""
 89    echo "Run without --dry-run to apply these changes"
 90else
 91    echo "$UPDATED_SETTINGS" | jq '.' > "$SETTINGS_FILE"
 92    echo "Successfully updated $SETTINGS_FILE"
 93    echo ""
 94    echo "Hook binaries configured:"
 95    echo "  - SessionStart: claude-hooks-initialize-session"
 96    echo "  - PostToolUse: claude-hooks-capture-tool-output"
 97    echo "  - SessionEnd: claude-hooks-save-session"
 98    echo ""
 99    echo "Make sure claude-hooks is installed:"
100    echo "  nix profile install .#claude-hooks"
101    echo ""
102    echo "Or add to your home-manager configuration:"
103    echo "  home.packages = [ pkgs.claude-hooks ];"
104fi