# Cabret Cabret is a yaml based static site generator, ideally with the same features as Hugo but with a simpler model. Here is a simple example of a _Cabretfile.yaml_ ## Build ```bash shell $ go build -v -o ./bin/cabret ./cmd/cabret ``` ## Introduction ```yaml build: - pipeline: - source: index.html - use: layout path: layouts/base.html - target: dist/index.html - pipeline: - source: posts/{{ .Id }}.md - plugin: markdown - use: layout path: layouts/base.html - target: dist/posts/{{ .Id }}/index.html ``` Cabret is based on the idea of a data pipeline. Along a pipeline flows **a list** of `Content` items that are just items with a data, mime type and metadata. ```go type Content struct { Type string Metadata map[string]any Data []byte } ``` The `Type` is the _mime type_ of the `Data`. The `Metadata` can be whatever the user wants and operations can populate it with special fields as they please. In some cases its useful to have `Data` be `nil`, when that happens the `Type` should be `cabret.MetadataOnly` (just the string `"metadata-only"`) ## Operations Each pipeline is a list of operations, the first field in an operation should be one of `source`, `use` or `target`. - `source: ` A **path pattern** is a "glob pattern" with captures, some examples are ``` posts/{id}.md {{folders}}/{year}-{month}-{day}.json ``` the only difference is that `{{...}}` captures can match slashes so can be used to match more than one "path part", while `{...}` can only match non slash characters. Load files matching the given pattern and populates the field `.Metadata.MatchResult` with the captures. Other supported forms are ```yaml use: source path: ``` ```yaml use: source paths: - ... - ``` - `target: ` A **path template** can contains `{...}` interpolations, the key inside the braces will be replaced using the `.Metadata.MatchResult` map. Double braces can also be used and are evaluated using Go `text/template` with context the whole item metadata. For each incoming item this will render the given path template with the item metadata and write the content to disk. - `use: ` This will apply the provided operations to the incoming items, for now available operations are - **Template** is a list operation that will concatenate all incoming items and render them using the specified template engine ```yaml use: template engine: ``` for now `engine` can be one of - `html` — golang html template engine - `text` — golang text template engine - (_TODO_) `handlebars` — the famous Handlebars template engine - **Layout** is an item operation that works like the previous one as it will use a template engine to render the content of the output item. The main difference is that this will pass the previous item content in the template context in the `.Content` field. ```yaml use: layout path: ``` ```yaml use: layout paths: - ... - ``` This operation will automatically choose between the go html or text template engines based on the first file name extension, _TODO: make this configurable like the `template` operation_) The template context is the incoming item metadata as well its data passed in the `.Content` variable. This is useful for wrapping partial html pages into full documents. - **Markdown** doesn't need any other options (TODO: add some options to configure _goldmark_) ```yaml use: markdown ``` This will render each incoming item using goldmark with some reasonable default options. By default this will also read YAML frontmatter. - **Frontmatter** as the previous one but just reads frontmatter. ```yaml use: frontmatter ``` - **Categorize** can be used in the following forms ```yaml use: categorize key: bind: # optional ``` This will categorize all items based on the provided key, for example if key is `tags` then the incoming list of posts will be converted in a list of empty contents with a `Category` field telling the item's category and an `Items` field containing a list of posts with that tag. By default the output item category is placed into `Category` but this can be changed with the `bind` option. - **Chunk** can be used to paginate some items ```yaml use: chunk size: skip_remaining: # optional, defaults to "false" ``` This operation will group the incoming items in chunk with the provided size (except for the last one that can end up holding less items). The option `skip_remaining` will exclude the last chunk if it doesn't have exactly "size" items. The output items hold no data but have the following structure ```go Metadata: { Index: /* 0-indexed current chunk number */, Total: /* total number of chunks */, Items: /* list of items of this chunk */, } ``` - **Slice** extract a sub range of items ```yaml use: slice from: # inclusive, defaults to 0 to: # exclusive, defaults to len(Items) ``` Does what you expect to the incoming list of items. - **Program** is an item operation that will run a specified program passing the current item as stdin. The program output is then processed and becomes the new item data. ```yaml use: program io: # optional, defaults to "raw" command: # required ``` The io format specifies how the current item is passed to the given program - `raw` — will just pass the item `.Data` raw as stdin to the specified command. - `json` — will encode the whole item (also including type and metadata) as json ad pass that string as stdin to the specified command. _TODO: Make the shell command be a go text/template string, for passing metadata directly thorough the command string._ - (_TODO_) **Sort** sorts the incoming items using the provided key and direction (by default is ascending) ```yaml use: sort direction: key: ``` ## Architecture - `cabret.go` — all abstract types and functions - `path/` — handles path patterns and templates - `config/` — contains config structure definitions and handles loading from YAML - `cmd/cabret/` — module that puts it all together in a CLI application - `operation/` — module containing all operations - `operation/template/` — a small module that abstract the concept of a template, used by the layout operation. - `runner/` — a module that depends on `config`, `parse` and `operations` and evaluates operations. - `parse/` — handles the conversion of pipelines and lists of operations to core types.