hugo/tpl
Bjørn Erik Pedersen 80230f26a3
Add support for theme composition and inheritance
This commit adds support for theme composition and inheritance in Hugo.

With this, it helps thinking about a theme as a set of ordered components:

```toml
theme = ["my-shortcodes", "base-theme", "hyde"]
```

The theme definition example above in `config.toml` creates a theme with the 3 components with presedence from left to right.

So, Hugo will, for any given file, data entry etc., look first in the project, and then in `my-shortcode`, `base-theme` and lastly `hyde`.

Hugo uses two different algorithms to merge the filesystems, depending on the file type:

* For `i18n` and `data` files, Hugo merges deeply using the translation id and data key inside the files.
* For `static`, `layouts` (templates) and `archetypes` files, these are merged on file level. So the left-most file will be chosen.

The name used in the `theme` definition above must match a folder in `/your-site/themes`, e.g. `/your-site/themes/my-shortcodes`. There are  plans to improve on this and get a URL scheme so this can be resolved automatically.

Also note that a component that is part of a theme can have its own configuration file, e.g. `config.toml`. There are currently some restrictions to what a theme component can configure:

* `params` (global and per language)
* `menu` (global and per language)
* `outputformats` and `mediatypes`

The same rules apply here: The left-most param/menu etc. with the same ID will win. There are some hidden and experimental namespace support in the above, which we will work to improve in the future, but theme authors are encouraged to create their own namespaces to avoid naming conflicts.

A final note: Themes/components can also have a `theme` definition in their `config.toml` and similar, which is the "inheritance" part of this commit's title. This is currently not supported by the Hugo theme site. We will have to wait for some "auto dependency" feature to be implemented for that to happen, but this can be a powerful feature if you want to create your own theme-variant based on others.

Fixes #4460
Fixes #4450
2018-06-10 23:55:20 +02:00
..
cast tpl: Add float template function 2017-09-28 16:53:18 +02:00
collections Add support for theme composition and inheritance 2018-06-10 23:55:20 +02:00
compare Properly handle -DEV suffix when comparing Hugo versions 2018-02-22 17:16:42 +01:00
crypto all: Update import paths to gohugoio/hugo 2017-06-13 18:42:45 +02:00
data Add support for theme composition and inheritance 2018-06-10 23:55:20 +02:00
encoding all: Update import paths to gohugoio/hugo 2017-06-13 18:42:45 +02:00
fmt tpl: Add errorf template function 2017-10-03 07:59:51 +02:00
images tpl/images: Close image file 2017-11-25 18:38:33 +01:00
inflect vendor: Fix Humanize for multi-byte runes 2017-11-28 21:16:01 +01:00
internal all: Fix spelling 2017-08-07 20:19:24 +02:00
lang Add a way to merge pages by language 2018-03-16 10:10:01 +01:00
math tpl/math: Refactor Mod with cast 2017-10-30 21:55:36 +01:00
os tpl/os: Make fileExist use the same filesystem as readFile 2018-04-21 23:46:34 +02:00
partials tpl/partials: Fix the lock contention in cached partial 2017-11-16 11:59:45 +01:00
path tpl/path: Add path.Ext, path.Dir and path.Base 2018-04-22 10:57:37 +02:00
safe Run gofmt to get imports in line vs gohugoio/hugo 2017-06-13 19:12:10 +02:00
strings tpl/strings: strings.RuneCount 2018-06-04 20:47:03 +03:00
time tpl/time: Add time.Duration and time.ParseDuration template funcs 2017-09-09 09:43:00 +02:00
tplimpl Add support for theme composition and inheritance 2018-06-10 23:55:20 +02:00
transform Add support for theme composition and inheritance 2018-06-10 23:55:20 +02:00
urls tpl/urls: Add anchorize template func 2018-04-15 23:17:50 +02:00
template.go Add support for theme composition and inheritance 2018-06-10 23:55:20 +02:00