### Go: Basic Dependency Injection without Sets

Source: https://github.com/mazrean/kessoku/blob/main/examples/sets/README.md

Demonstrates a basic dependency injection setup in Go using `kessoku.Inject` without utilizing `kessoku.Set` for grouping providers. It shows the direct provision of multiple dependencies.

```go
var _ = kessoku.Inject[*App](
    "InitializeAppBasic",
    kessoku.Provide(NewConfig),
    kessoku.Provide(NewDatabase),
    kessoku.Provide(NewUserService),
    kessoku.Provide(NewApp),
)
```

--------------------------------

### Bash: Running the kessoku Sets Example

Source: https://github.com/mazrean/kessoku/blob/main/examples/sets/README.md

Provides the necessary bash commands to generate dependency injection code and run the kessoku sets example application. This is essential for testing the implemented dependency injection patterns.

```bash
# Generate dependency injection code
go generate ./examples/sets

# Run the example
go run ./examples/sets
```

--------------------------------

### Go: Dependency Injection with Inline kessoku.Set

Source: https://github.com/mazrean/kessoku/blob/main/examples/sets/README.md

Illustrates using an inline `kessoku.Set` to group related providers directly within the `kessoku.Inject` call. This enhances organization by bundling configuration and database setup.

```go
var _ = kessoku.Inject[*App](
    "InitializeAppWithInlineSet",
    kessoku.Set(
        kessoku.Provide(NewConfig),
        kessoku.Provide(NewDatabase),
    ),
    kessoku.Provide(NewUserService),
    kessoku.Provide(NewApp),
)
```

--------------------------------

### Install Kessoku CLI (Windows Binary)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Provides steps to download and install the Kessoku CLI binary for Windows systems.

```powershell
# Download and install
Invoke-WebRequest -Uri "https://github.com/mazrean/kessoku/releases/latest/download/kessoku_Windows_x86_64.zip" -OutFile "kessoku.zip"
Expand-Archive -Path "kessoku.zip" -DestinationPath "."
Move-Item "kessoku.exe" "$env:USERPROFILE\bin\" -Force
# Add $env:USERPROFILE\bin to your PATH if not already added
```

--------------------------------

### Parallel DI Example (Go)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Demonstrates how to use Kessoku for parallel dependency injection, contrasting it with sequential initialization. It shows how independent providers can run concurrently to reduce startup time.

```Go
package main

import (
    "fmt"
    "time"
    "github.com/mazrean/kessoku"
)

func SlowDB() string {
    time.Sleep(200 * time.Millisecond)
    return "DB-connected"
}

func SlowCache() string {
    time.Sleep(150 * time.Millisecond)
    return "Cache-ready"
}

//go:generate go tool kessoku $GOFILE

var _ = kessoku.Inject[string]("InitApp",
    kessoku.Async(kessoku.Provide(SlowDB)),
    kessoku.Async(kessoku.Provide(SlowCache)),
    kessoku.Provide(func(db, cache string) string {
        return fmt.Sprintf("App running with %s and %s", db, cache)
    }),
)

func main() {
    start := time.Now()
    result, _ := InitApp()
    fmt.Printf("%s in %v\n", result, time.Since(start))
}
```

--------------------------------

### Install Kessoku CLI (Go Tool)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Instructions for installing the Kessoku command-line tool using the Go toolchain, which is required for code generation.

```bash
go get -tool github.com/mazrean/kessoku/cmd/kessoku
```

--------------------------------

### Install Kessoku CLI (Homebrew)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Instructions for installing the Kessoku CLI using Homebrew on macOS or Linux.

```bash
brew install mazrean/tap/kessoku
```

--------------------------------

### Install Kessoku CLI (Debian/Ubuntu)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Instructions for installing the Kessoku CLI on Debian or Ubuntu systems using a .deb package.

```bash
wget https://github.com/mazrean/kessoku/releases/latest/download/kessoku_amd64.deb
sudo apt install ./kessoku_amd64.deb
```

--------------------------------

### Install Kessoku CLI (Linux/macOS Binary)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Provides steps to download and install the Kessoku CLI binary for Linux or macOS systems.

```bash
# Download and install (replace with your platform)
curl -L -o kessoku.tar.gz https://github.com/mazrean/kessoku/releases/latest/download/kessoku_Linux_x86_64.tar.gz
tar -xzf kessoku.tar.gz
sudo mv kessoku /usr/local/bin/
```

--------------------------------

### Go: Dependency Injection with Reusable Set Variables

Source: https://github.com/mazrean/kessoku/blob/main/examples/sets/README.md

Shows how to define reusable `kessoku.Set` variables for grouping providers, such as a `DatabaseSet`. This promotes reusability and cleaner code by abstracting common provider groups.

```go
var DatabaseSet = kessoku.Set(
    kessoku.Provide(NewConfig),
    kessoku.Provide(NewDatabase),
)

var _ = kessoku.Inject[*App](
    "InitializeAppWithSetVariable",
    DatabaseSet, // Reuse the set
    kessoku.Provide(NewUserService),
    kessoku.Provide(NewApp),
)
```

--------------------------------

### Go: Dependency Injection with Nested kessoku.Sets

Source: https://github.com/mazrean/kessoku/blob/main/examples/sets/README.md

Demonstrates the capability of nesting `kessoku.Set` instances within each other. This allows for hierarchical organization of providers, combining multiple sets into a single, comprehensive group.

```go
var ServiceSet = kessoku.Set(
    DatabaseSet, // Include another set
    kessoku.Provide(NewUserService),
)

var _ = kessoku.Inject[*App](
    "InitializeAppWithNestedSets",
    ServiceSet, // This includes both database and service
    kessoku.Provide(NewApp),
)
```

--------------------------------

### Install Kessoku CLI (Red Hat/CentOS/Fedora)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Instructions for installing the Kessoku CLI on Red Hat, CentOS, or Fedora systems using an .rpm package.

```bash
wget https://github.com/mazrean/kessoku/releases/latest/download/kessoku_amd64.rpm
# For CentOS/RHEL 7 and older
sudo yum install ./kessoku_amd64.rpm
```

--------------------------------

### Install Kessoku on Alpine Linux

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Downloads the latest Kessoku release from GitHub and installs it using apk on Alpine Linux. The --allow-untrusted flag is used as the package is not signed.

```bash
wget https://github.com/mazrean/kessoku/releases/latest/download/kessoku_amd64.apk
sudo apk add --allow-untrusted kessoku_amd64.apk
```

--------------------------------

### Install Kessoku on CentOS/RHEL/Fedora

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Installs the Kessoku package using dnf on RPM-based Linux distributions like CentOS, RHEL 8+, and Fedora. This command assumes the RPM file is present in the current directory.

```bash
sudo dnf install ./kessoku_amd64.rpm
```

--------------------------------

### Testing and Formatting

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Essential commands for maintaining code quality. `go test` runs unit tests, and `go fmt` formats Go source files according to standard Go conventions.

```bash
# Run tests
go test -v ./...

# Format code
go fmt ./...
```

--------------------------------

### Sequential vs Parallel Startup Comparison (Mermaid)

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Visualizes the difference in application startup times between sequential and parallel dependency injection using a Mermaid Gantt chart. Highlights the time savings achieved with parallel execution.

```Mermaid
gantt
    title Sequential vs Parallel Startup
    dateFormat X
    axisFormat %L
    
    section Sequential (slow)
    DB Service    :0, 3
    Cache Service :3, 5  
    Auth Service  :5, 6
    
    section Parallel (fast)
    DB Service    :0, 3
    Cache Service :0, 2
    Auth Service  :0, 1
```

--------------------------------

### Building and Code Generation

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Commands for building the Kessoku binary and generating dependency injection code. `go build` compiles the project, `go generate` runs code generation directives, and `go tool kessoku` directly invokes the tool.

```bash
# Build the binary
go build -o bin/kessoku ./cmd/kessoku

# Generate dependency injection code using go generate
go generate ./...

# Generate dependency injection code directly
go tool kessoku [files...]
```

--------------------------------

### Kessoku Dependency Injection - Injector Declarations

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Shows how to declare dependencies for Kessoku using `kessoku.Inject` and `kessoku.Provide`. The `//go:generate` directive triggers code generation.

```go
package main

//go:generate go tool kessoku $GOFILE

import "github.com/mazrean/kessoku"

var _ = kessoku.Inject[*App](
    "InitializeApp",
    kessoku.Provide(NewConfig),
    kessoku.Provide(NewDatabase),
    kessoku.Provide(NewUserService),
    kessoku.Provide(NewApp),
)
```

--------------------------------

### Release Management

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Utilizes GoReleaser for managing project releases. It supports creating snapshot releases for local testing and full releases after tagging.

```bash
# Create a snapshot release (local testing)
go tool goreleaser release --snapshot --clean

# Create a full release (requires git tag)
git tag v1.0.0
go tool goreleaser release --clean
```

--------------------------------

### Kessoku Dependency Injection - Provider Functions

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Demonstrates how to define provider functions in Go that return dependencies. These functions are used by Kessoku to generate injection code.

```go
// NewDatabase creates a database connection.
func NewDatabase(config *Config) (*Database, error) {
    // implementation
}
```

--------------------------------

### Linting

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Executes a comprehensive Go analyzer linter to identify potential code quality issues and enforce coding standards.

```bash
# Run comprehensive Go analyzer linter
go tool tools lint ./...
```

--------------------------------

### Kessoku Go Library API Reference

Source: https://github.com/mazrean/kessoku/blob/main/README.md

Key functions and concepts for the Kessoku Go dependency injection library. It covers parallel execution, provider registration, value injection, and interface binding.

```APIDOC
kessoku.Async(provider)
  - Description: Makes a provider run in parallel with other independent async providers.
  - Parameters:
    - provider: The function or value to be provided.

kessoku.Provide(fn)
  - Description: Registers a regular provider that runs sequentially.
  - Parameters:
    - fn: The function to be provided.

kessoku.Inject[T](name, ...)
  - Description: Generates the injector function for a specific type or name.
  - Parameters:
    - T: The type of the dependency to inject.
    - name: The name or identifier of the dependency.
    - ...: Other dependencies required by the injector.

kessoku.Set(...)
  - Description: Groups multiple providers for reuse as a single unit.
  - Parameters:
    - ...: Providers to be grouped.

kessoku.Value(val)
  - Description: Injects a constant value directly.
  - Parameters:
    - val: The constant value to inject.

kessoku.Bind[Interface](impl)
  - Description: Binds an interface to its concrete implementation.
  - Parameters:
    - Interface: The interface type.
    - impl: The implementation of the interface.

Rule:
  - Independent async providers run in parallel, dependent ones wait automatically.
```

--------------------------------

### API Compatibility Checking

Source: https://github.com/mazrean/kessoku/blob/main/CLAUDE.md

Compares API compatibility between different versions of a Go package. It helps detect breaking changes by analyzing exported symbols.

```bash
# Check API compatibility against a previous version
go tool tools apicompat <base_package_path> <target_package_path>

# Example: Check current changes against latest released version
go tool tools apicompat github.com/mazrean/kessoku@latest github.com/mazrean/kessoku

# Example: Check against a specific version
go tool tools apicompat github.com/mazrean/kessoku@v1.0.0 github.com/mazrean/kessoku
```

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