trap-handler-generator

Development

Generate trap handlers for cleanup, signal handling, and graceful shutdown in shell scripts.

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/cli-mcp-development/skills/trap-handler-generator/SKILL.md

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Trap Handler Generator

Generate trap handlers for shell scripts.

Capabilities

Generate cleanup trap handlers
Implement signal handling
Create graceful shutdown logic
Set up resource cleanup
Handle nested traps
Generate error handlers

Generated Patterns

#!/usr/bin/env bash

# Temporary resources to clean up
declare -a CLEANUP_ITEMS=()
CLEANUP_DONE=false

# Register cleanup item
register_cleanup() {
    CLEANUP_ITEMS+=("$1")
}

# Cleanup function
cleanup() {
    if [[ "$CLEANUP_DONE" == true ]]; then
        return
    fi
    CLEANUP_DONE=true

    local exit_code=$?
    echo "Cleaning up..."

    for item in "${CLEANUP_ITEMS[@]}"; do
        if [[ -d "$item" ]]; then
            rm -rf "$item" 2>/dev/null
        elif [[ -f "$item" ]]; then
            rm -f "$item" 2>/dev/null
        elif [[ -n "$item" ]]; then
            # Command to run
            eval "$item" 2>/dev/null
        fi
    done

    return $exit_code
}

# Error handler
on_error() {
    local exit_code=$?
    local line_no=$1
    echo "Error on line ${line_no}: command exited with ${exit_code}" >&2
    cleanup
    exit $exit_code
}

# Signal handlers
on_sigint() {
    echo -e "\nInterrupted by user"
    cleanup
    exit 130
}

on_sigterm() {
    echo "Terminated"
    cleanup
    exit 143
}

# Set up traps
trap cleanup EXIT
trap 'on_error ${LINENO}' ERR
trap on_sigint INT
trap on_sigterm TERM

# Usage
TEMP_DIR=$(mktemp -d)
register_cleanup "$TEMP_DIR"

TEMP_FILE=$(mktemp)
register_cleanup "$TEMP_FILE"

register_cleanup "docker stop mycontainer"

Target Processes

shell-script-development
error-handling-user-feedback
cross-platform-cli-compatibility