{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "title": "Reveal.yaml Schema",
    "description": "The validator of Reveal.yaml",
    "definitions": {
        "path": {
            "type": "string",
            "pattern": "^(?:https?://)?(?:[\\w.-]+/?)+"
        },
        "$sized": {
            "type": "object",
            "minProperties": 1,
            "required": [
                "src"
            ],
            "properties": {
                "src": {
                    "title": "Soure path",
                    "$ref": "#/definitions/path"
                },
                "width": {
                    "title": "Width",
                    "type": [
                        "integer",
                        "string"
                    ]
                },
                "height": {
                    "title": "Height",
                    "type": [
                        "integer",
                        "string"
                    ]
                }
            }
        },
        "sized": {
            "$ref": "#/definitions/$sized",
            "additionalProperties": false
        },
        "img": {
            "$ref": "#/definitions/$sized",
            "properties": {
                "label": {
                    "title": "Image caption",
                    "type": "string"
                }
            },
            "title": "Image"
        },
        "$slide": {
            "title": "A slide",
            "type": "object",
            "minProperties": 1,
            "properties": {
                "title": {
                    "title": "Single line Markdown level 2 title",
                    "type": "string"
                },
                "doc": {
                    "title": "Multiline Markdown pargraph",
                    "type": "string"
                },
                "include": {
                    "title": "Include a Markdown file from path, append after \"doc\"",
                    "$ref": "#/definitions/path"
                },
                "math": {
                    "title": "Latex math without \"$$\" brackets",
                    "type": "string"
                },
                "youtube": {
                    "title": "Youtube video",
                    "$ref": "#/definitions/sized"
                },
                "embed": {
                    "title": "External resource like PDF",
                    "$ref": "#/definitions/sized"
                },
                "img": {
                    "title": "Images",
                    "anyOf": [
                        {
                            "$ref": "#/definitions/img"
                        },
                        {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/img"
                            },
                            "minItems": 1
                        }
                    ]
                },
                "fragment": {
                    "title": "Fragment option",
                    "type": "object",
                    "minProperties": 1,
                    "additionalProperties": false,
                    "properties": {
                        "math": {
                            "type": "string"
                        },
                        "img": {
                            "type": "string"
                        },
                        "youtube": {
                            "type": "string"
                        },
                        "embed": {
                            "type": "string"
                        }
                    }
                }
            }
        },
        "slide": {
            "$ref": "#/definitions/$slide",
            "additionalProperties": false
        },
        "hslide": {
            "$ref": "#/definitions/slide",
            "additionalProperties": false,
            "properties": {
                "sub": {
                    "title": "Vertical slides",
                    "anyOf": [
                        {
                            "$ref": "#/definitions/slide"
                        },
                        {
                            "type": "array",
                            "items": {
                                "$ref": "#/definitions/slide"
                            },
                            "minItems": 1
                        }
                    ]
                }
            }
        }
    },
    "type": "object",
    "required": [
        "nav"
    ],
    "properties": {
        "lang": {
            "title": "Page language",
            "type": "string",
            "default": "en"
        },
        "title": {
            "title": "Page title, default is same as first page",
            "type": "string"
        },
        "description": {
            "title": "Page description",
            "type": "string"
        },
        "author": {
            "title": "Page author",
            "type": "string"
        },
        "cdn": {
            "title": "Accessible CDN path if missing local files",
            "$ref": "#/definitions/path"
        },
        "watermark": {
            "title": "Watermark source",
            "$ref": "#/definitions/path"
        },
        "watermark-size": {
            "title": "Source width",
            "type": [
                "integer",
                "string"
            ]
        },
        "outline": {
            "title": "Outline page under first column with depth",
            "type": "integer",
            "default": 0,
            "maximum": 2,
            "minimum": 0
        },
        "theme": {
            "title": "Reveal.js theme",
            "type": "string",
            "default": "serif"
        },
        "code-theme": {
            "title": "Highlight theme",
            "type": "string",
            "default": "zenburn"
        },
        "icon": {
            "title": "Icon path",
            "$ref": "#/definitions/path",
            "default": "img/icon.png"
        },
        "default-style": {
            "title": "Use default style",
            "type": "boolean",
            "default": true
        },
        "extra-style": {
            "title": "Extra CSS style path",
            "$ref": "#/definitions/path"
        },
        "nav-mode": {
            "title": "Reveal navigation mode option",
            "type": "string"
        },
        "show-arrows": {
            "title": "Show control arrows",
            "type": "boolean",
            "default": true
        },
        "center": {
            "title": "Auto center the \"doc\"",
            "type": "boolean",
            "default": true
        },
        "loop": {
            "title": "Loop the slides",
            "type": "boolean",
            "default": false
        },
        "history": {
            "title": "Enable page history",
            "type": "boolean",
            "default": true
        },
        "slide-num": {
            "title": "Slide number style",
            "type": [
                "boolean",
                "string"
            ],
            "default": "c/t"
        },
        "progress": {
            "title": "Show progress bar",
            "type": "boolean",
            "default": true
        },
        "mouse-wheel": {
            "title": "Allow wheel control",
            "type": "boolean",
            "default": false
        },
        "preview-links": {
            "title": "Open a preview window for links",
            "type": "boolean",
            "default": false
        },
        "transition": {
            "title": "Transition mode",
            "type": "string",
            "default": "linear"
        },
        "footer": {
            "title": "Footer block",
            "$ref": "#/definitions/$sized",
            "properties": {
                "label": {
                    "title": "Footer title",
                    "type": "string"
                },
                "link": {
                    "title": "Link for footer title",
                    "$ref": "#/definitions/path"
                }
            }
        },
        "plugin": {
            "description": "Plugin enable / disable options",
            "type": "object",
            "minProperties": 1,
            "additionalProperties": false,
            "properties": {
                "zoom": {
                    "type": "boolean",
                    "default": false
                },
                "notes": {
                    "type": "boolean",
                    "default": true
                },
                "search": {
                    "type": "boolean",
                    "default": false
                },
                "highlight": {
                    "type": "boolean",
                    "default": true
                },
                "math": {
                    "type": "boolean",
                    "default": false
                }
            }
        },
        "nav": {
            "title": "Horizontal slides",
            "anyOf": [
                {
                    "$ref": "#/definitions/hslide"
                },
                {
                    "type": "array",
                    "items": {
                        "$ref": "#/definitions/hslide"
                    },
                    "minItems": 1
                }
            ]
        }
    }
}