jqplusplus

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JSON++ is an elaboration language embedded in JSON syntax whose evaluation function surjectively maps JSON++ documents onto JSON values.

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# jq++

A project that productizes the [jq-front](https://github.com/dakusui/jq-front).
jq-front is a simple utility that extends JSON files with file- and node-level inheritance and expression evaluation, making it easier to create reusable and dynamic JSON-based configurations.

This project follows the standard Go project layout.

## Installation

### Prerequisites

- Go 1.24.5 or later (see [go.mod](go.mod) for the exact version requirement)
- Make (optional, for using the Makefile)

### Download a prebuilt binary

Each release attaches prebuilt binaries for common platforms. Grab the one for
your OS/arch from the [Releases page](https://github.com/dakusui/jqplusplus/releases),
rename it to `jq++`, `chmod +x` it, and put it on your `PATH`.

### Install from Source

The easiest way to install `jqplusplus` is using `go install`:

```sh
go install github.com/dakusui/jqplusplus/cmd/jqplusplus@latest && jqplusplus
```

This will install the `jqp++` binary to `$GOPATH/bin` or `$GOBIN` (if set). Make sure this directory is in your `PATH`.

### Build from Source

Clone the repository:

```sh
git clone https://github.com/dakusui/jqplusplus.git
cd jqplusplus
```

Then build using Make:

```sh
make build
```

This will create the executable as `bin/jq++`.

Alternatively, build directly with Go:

```sh
go build -o bin/jq++ ./cmd/jqplusplus
```

### Adding to PATH

After building, you can add the `bin` directory to your PATH, or copy the binary to a directory already in your PATH:

```sh
# Option 1: Add bin directory to PATH (add to ~/.bashrc, ~/.zshrc, etc.)
export PATH="$PATH:$(pwd)/bin"

# Option 2: Copy to a directory in PATH (e.g., /usr/local/bin)
sudo cp bin/jq++ /usr/local/bin/
```

## Usage Example

Let's prepare files, `name.json` and `greeting.json`, from which you want to create a new JSON by extending them.

```shell script
$ echo '{"yourname":"Mark"}' > name.json
$ cat name.json
{"yourname":"Mark"}

$ echo '{"greeting":"Hello"}' > greeting.json
$ cat greeting.json
{"greeting":"Hello"}
```

Then create a file that extends them.

```shell script
$ echo '{
    "$extends": ["greeting.json", "name.json"],
    "sayHello": "eval:string:refexpr(\".greeting\") + \", \" + refexpr(\".yourname\") + \". Today is \" + (now|todate) + \". How are you doing?\""
  }' > sayHello.json
```

Now, let's try jq++.
```shell script
$ jq++ sayHello.json
{
  "yourname": "Mark",
  "greeting": "Hello",
  "sayHello": "Hello, Mark. Today is 2026-03-21T17:57:25Z. How are you doing?"
}
$
```
Doesn't it seem useful? Have fun!

### Reading from stdin

If no files are given, `jq++` reads from stdin. Stdin has no filename, so it is
parsed as **JSON by default**. To feed YAML (or any other supported format) via
stdin, tell `jq++` the type with `-t` / `--input`:

```shell script
$ echo 'greeting: Hello' | jq++ --input yaml
{
  "greeting": "Hello"
}

$ echo 'greeting: Hello' | jq++ -t yaml   # short form; -t=yaml also works
```

Supported types match the recognized file extensions: `json`, `yaml`/`yml`,
`toml`, `json5`, `hocon`/`conf`, and their `++` variants. The flag only applies
to stdin — input from files is detected by its extension, so passing `-t`
together with file arguments is an error.

### YAML in, YAML out with `yq++`

`yq++` is a YAML front-end for `jq++`: it runs `jq++`, strips private
`_`-prefixed holder keys, and emits YAML. Because its job is YAML, stdin is
treated as YAML by default (no `-t` needed):

```shell script
$ yq++ config.yaml++          # resolve a YAML file, emit YAML
$ yq++ < config.yaml          # same, from stdin
```

`yq++` requires `jq`, plus either `ruby` or `python3` (with PyYAML) to emit YAML.

## Project Structure

- `cmd/jqplusplus/main.go`: Application entry point
- `internal/`: Private application and library code
- `pkg/`: Public libraries (if any)
- `go.mod`, `LICENSE`, `README.md`, `Makefile`: Project metadata and configuration

## Building and Running

To build the main application:

```sh
make build
```

This will create the executable as `bin/jq++`.

To run the program:

```sh
./bin/jq++
```

Or run directly without building:

```sh
make run
``` 
## Project Dependencies

* `xmllint`: On Ubuntu, do `sudo apt install libxml2-utils`

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