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CLENCLI enables you to quickly and predictably create, change, and improve your cloud projects. It is an open source tool that simplifies common tasks that many Cloud engineers have to perform on a daily basis by creating and maintaining the code structure and its documentation always up-to-date.

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# Cloud Engineer CLI (clencli)

A command line tool that scaffolds standardized project structures and renders project documentation from YAML.

[![GitHub issues](https://img.shields.io/github/issues/awslabs/clencli)](https://github.com/awslabs/clencli/issues)
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[![GitHub license](https://img.shields.io/github/license/awslabs/clencli)](https://github.com/awslabs/clencli/blob/main/LICENSE)

## Overview

In a polyglot environment where each team picks its own programming language, repositories tend to drift apart in structure and documentation. clencli addresses this by giving you a consistent way to scaffold a project layout and to render documentation from a single YAML data file.

You describe your README (or any other document) once in a `clencli/<name>.yaml` data file paired with a `clencli/<name>.tmpl` template, then run `clencli render template` to produce the Markdown output. clencli also scaffolds new projects (basic, cloud, AWS CloudFormation, and Terraform layouts), downloads `.gitignore` files, and retrieves photos from Unsplash for use as project artwork.

clencli is written in Go and is distributed in the `awslabs` GitHub organization. It is not an officially supported AWS product.

## Features

- Scaffold new projects in `basic`, `cloud`, `cloudformation`, or `terraform` layouts.
- Render Markdown documents from a YAML data file and a Go template.
- Download `.gitignore` files from the gitignore.io API by type.
- Download photos from Unsplash to use as project artwork.
- Manage named profiles of credentials and configurations.

## Prerequisites

- Go 1.16 or later, if you build from source.
- A network connection for the `gitignore` and `unsplash` commands, which call external APIs.
- An Unsplash API key, only if you use the `unsplash` command or Unsplash-backed artwork. See [Configuration](#configuration).

## Installation

clencli embeds its template resources into the binary at build time using a code generation step. Build it from source with the Go toolchain.

1. Clone the repository.

```bash
   git clone https://github.com/awslabs/clencli.git
   cd clencli
   ```

2. Generate the embedded resources and build the binary.

```bash
   go generate ./...
   go build -o clencli .
   ```

3. Move the binary onto your `PATH`.

```bash
   sudo mv clencli /usr/local/bin/
   ```

You can also download a prebuilt binary for your platform from the [releases page](https://github.com/awslabs/clencli/releases) and place it on your `PATH`.

If the build fails to resolve dependencies, see [Troubleshooting](#troubleshooting).

## Getting started

Initialize a basic project and render its README.

```bash
clencli init project --project-name foo
```

```text
foo was successfully initialized as a basic project
```

This creates the following layout:

```text
foo/
├── clencli
│   ├── readme.tmpl
│   └── readme.yaml
└── .gitignore
```

Render the README from the generated template and data file.

```bash
cd foo
clencli render template
```

```text
Template readme.tmpl rendered as README.md.
```

The `README.md` is generated from `clencli/readme.yaml` and `clencli/readme.tmpl`. Edit the YAML data file, then re-run `clencli render template` to regenerate the document.

## Usage

The following examples cover the most common tasks. For the full command reference, see [COMMANDS.md](COMMANDS.md).

Create a Terraform project:

```bash
clencli init project --project-name foo --project-type terraform
```

```text
foo/
├── clencli
│   ├── hld.tmpl
│   ├── hld.yaml
│   ├── readme.tmpl
│   └── readme.yaml
├── environments
│   ├── dev.tf
│   └── prod.tf
├── .gitignore
├── LICENSE
├── main.tf
├── Makefile
├── outputs.tf
└── variables.tf
```

Render a named template other than the default `readme`:

```bash
clencli render template --name hld
```

Download a `.gitignore` file for one or more types:

```bash
clencli gitignore --input terraform,visualstudiocode
```

```text
.gitignore created successfully
```

List the valid `.gitignore` types:

```bash
clencli gitignore list
```

Print the version:

```bash
clencli version
```

```text
clencli v0.3.6 go1.16 linux amd64
```

## Configuration

clencli stores credentials and configurations as YAML files in your user configuration directory, under a `clencli` subdirectory. The location is platform-specific: `~/.config/clencli` on Linux, `~/Library/Application Support/clencli` on macOS, and `%AppData%\clencli` on Windows.

| File | Purpose |
| --- | --- |
| `credentials.yaml` | Named profiles of API credentials, such as an Unsplash access key and secret key. |
| `configurations.yaml` | Named profiles of settings, such as Unsplash random-photo parameters and customized project initialization. |

Run `clencli configure` to create or update these files interactively. Use `--profile <name>` to target a named profile other than `default`:

```bash
clencli configure --profile work
```

Delete a profile:

```bash
clencli configure delete --profile work
```

Credentials and configuration files are written with `0600` permissions. The `unsplash` command and Unsplash-backed artwork require an `unsplash` credential in the active profile.

Global flags apply to every command:

| Flag | Default | Description |
| --- | --- | --- |
| `-p`, `--profile` | `default` | Use a specific profile from your credentials and configurations files. |
| `-v`, `--verbosity` | `error` | Log level. Valid values: `panic`, `fatal`, `error`, `warn`, `info`, `debug`, `trace`. |
| `--log` | `true` | Enable or disable logging to a file. When disabled, log output goes to the default output. |
| `--log-file-path` | `clencli/log.json` | Log file path. Requires `--log=true`. |

## How it works

clencli reads a YAML data file (`clencli/<name>.yaml`) and a matching Go template (`clencli/<name>.tmpl`), then uses [gomplate](https://github.com/hairyhenderson/gomplate) to render the template into a Markdown file named `<NAME>.md`. Template resources for project scaffolding are embedded into the binary at build time. The CLI itself is built with [Cobra](https://github.com/spf13/cobra) and [Viper](https://github.com/spf13/viper).

The following diagram shows the clencli commands and the resources they read or write.

```mermaid
flowchart LR
    user([You]) --> cli[clencli]

cli --> init[init project]
    cli --> render[render template]
    cli --> configure[configure]
    cli --> gitignore[gitignore]
    cli --> unsplash[unsplash]

box[(Embedded templates)] --> init
    init --> scaffold[Scaffolded project<br/>clencli/*.yaml + *.tmpl]

scaffold --> render
    render --> output[Rendered NAME.md]

configure --> creds[(credentials.yaml<br/>configurations.yaml)]
    creds -.-> render
    gitignore --> gi[.gitignore]
    unsplash --> photo[clencli/logo.jpeg]
```

The next diagram shows the `render template` flow, from validation through gomplate output.

```mermaid
flowchart TD
    start([clencli render template --name NAME]) --> check{clencli/NAME.yaml<br/>and NAME.tmpl exist?}
    check -->|No| err[Report missing database or template]
    check -->|Yes| logo[Update README logo]

logo --> source{Logo source?}
    source -->|unsplash.yaml present| dl[Download photo, set as logo]
    source -->|profile has unsplash credential| api[Request random photo from Unsplash]
    source -->|Neither| skip[Skip logo update]

dl --> build
    api --> build
    skip --> build

build[gomplate renders NAME.tmpl<br/>with NAME.yaml as data source] --> write([Write NAME.md])
```

## Troubleshooting

**The build fails with `invalid version: unknown revision` for a gomplate dependency.**

The version on the `main` branch pins `gomplate/v3`, whose transitive dependency `github.com/hairyhenderson/toml` references a revision that no longer resolves. Until the dependency is updated, use a prebuilt binary from the [releases page](https://github.com/awslabs/clencli/releases).

**The `unsplash` command reports `no unsplash credential found or no profile enabled`.**

Add an `unsplash` credential to the active profile with `clencli configure`, then retry. See [Configuration](#configuration).

**`render` reports a missing database or template.**

The `render` command requires both `clencli/<name>.yaml` and `clencli/<name>.tmpl` to exist in the current directory. Run `clencli init project` first, or create the files manually.

## Contributing

See [CONTRIBUTING.md](CONTRIBUTING.md).

## Security

See [CONTRIBUTING.md](CONTRIBUTING.md) for how to report security issues, or use the [AWS vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting/).

## License

This project is licensed under the Apache License 2.0. See [LICENSE](LICENSE).

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