9c3c13b50d
both of these render distinctly from plain literals in the manpage, and manpages even semantically distinguish between the two.
123 lines
5.2 KiB
Markdown
123 lines
5.2 KiB
Markdown
# Contributing to this documentation {#chap-contributing}
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The sources of the Nixpkgs manual are in the [doc](https://github.com/NixOS/nixpkgs/tree/master/doc) subdirectory of the Nixpkgs repository. The manual is still partially written in DocBook but it is progressively being converted to [Markdown](#sec-contributing-markup).
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You can quickly check your edits with `make`:
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```ShellSession
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$ cd /path/to/nixpkgs/doc
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$ nix-shell
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[nix-shell]$ make
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```
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If you experience problems, run `make debug` to help understand the docbook errors.
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After making modifications to the manual, it's important to build it before committing. You can do that as follows:
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```ShellSession
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$ cd /path/to/nixpkgs/doc
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$ nix-shell
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[nix-shell]$ make clean
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[nix-shell]$ nix-build .
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```
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If the build succeeds, the manual will be in `./result/share/doc/nixpkgs/manual.html`.
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## Syntax {#sec-contributing-markup}
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As per [RFC 0072](https://github.com/NixOS/rfcs/pull/72), all new documentation content should be written in [CommonMark](https://commonmark.org/) Markdown dialect.
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Additional syntax extensions are available, though not all extensions can be used in NixOS option documentation. The following extensions are currently used:
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- []{#ssec-contributing-markup-anchors}
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Explicitly defined **anchors** on headings, to allow linking to sections. These should be always used, to ensure the anchors can be linked even when the heading text changes, and to prevent conflicts between [automatically assigned identifiers](https://github.com/jgm/commonmark-hs/blob/master/commonmark-extensions/test/auto_identifiers.md).
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It uses the widely compatible [header attributes](https://github.com/jgm/commonmark-hs/blob/master/commonmark-extensions/test/attributes.md) syntax:
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```markdown
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## Syntax {#sec-contributing-markup}
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```
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- []{#ssec-contributing-markup-anchors-inline}
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**Inline anchors**, which allow linking arbitrary place in the text (e.g. individual list items, sentences…).
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They are defined using a hybrid of the link syntax with the attributes syntax known from headings, called [bracketed spans](https://github.com/jgm/commonmark-hs/blob/master/commonmark-extensions/test/bracketed_spans.md):
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```markdown
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- []{#ssec-gnome-hooks-glib} `glib` setup hook will populate `GSETTINGS_SCHEMAS_PATH` and then `wrapGAppsHook` will prepend it to `XDG_DATA_DIRS`.
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```
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- []{#ssec-contributing-markup-automatic-links}
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If you **omit a link text** for a link pointing to a section, the text will be substituted automatically. For example, `[](#chap-contributing)` will result in [](#chap-contributing).
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This syntax is taken from [MyST](https://myst-parser.readthedocs.io/en/latest/using/syntax.html#targets-and-cross-referencing).
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- []{#ssec-contributing-markup-inline-roles}
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If you want to link to a man page, you can use `` {manpage}`nix.conf(5)` ``, which will turn into {manpage}`nix.conf(5)`. The references will turn into links when a mapping exists in {file}`doc/build-aux/pandoc-filters/link-unix-man-references.lua`.
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A few markups for other kinds of literals are also available:
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- `` {command}`rm -rfi` `` turns into {command}`rm -rfi`
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- `` {env}`XDG_DATA_DIRS` `` turns into {env}`XDG_DATA_DIRS`
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- `` {file}`/etc/passwd` `` turns into {file}`/etc/passwd`
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- `` {option}`networking.useDHCP` `` turns into {option}`networking.useDHCP`
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- `` {var}`/etc/passwd` `` turns into {var}`/etc/passwd`
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These literal kinds are used mostly in NixOS option documentation.
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This syntax is taken from [MyST](https://myst-parser.readthedocs.io/en/latest/syntax/syntax.html#roles-an-in-line-extension-point). Though, the feature originates from [reStructuredText](https://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html#role-manpage) with slightly different syntax.
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::: {.note}
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Inline roles are available for option documentation.
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:::
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- []{#ssec-contributing-markup-admonitions}
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**Admonitions**, set off from the text to bring attention to something.
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It uses pandoc’s [fenced `div`s syntax](https://github.com/jgm/commonmark-hs/blob/master/commonmark-extensions/test/fenced_divs.md):
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```markdown
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::: {.warning}
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This is a warning
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:::
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```
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which renders as
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> ::: {.warning}
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> This is a warning.
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> :::
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The following are supported:
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- [`caution`](https://tdg.docbook.org/tdg/5.0/caution.html)
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- [`important`](https://tdg.docbook.org/tdg/5.0/important.html)
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- [`note`](https://tdg.docbook.org/tdg/5.0/note.html)
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- [`tip`](https://tdg.docbook.org/tdg/5.0/tip.html)
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- [`warning`](https://tdg.docbook.org/tdg/5.0/warning.html)
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::: {.note}
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Admonitions are available for option documentation.
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:::
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- []{#ssec-contributing-markup-definition-lists}
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[**Definition lists**](https://github.com/jgm/commonmark-hs/blob/master/commonmark-extensions/test/definition_lists.md), for defining a group of terms:
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```markdown
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pear
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: green or yellow bulbous fruit
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watermelon
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: green fruit with red flesh
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```
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which renders as
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> pear
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> : green or yellow bulbous fruit
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>
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> watermelon
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> : green fruit with red flesh
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For contributing to the legacy parts, please see [DocBook: The Definitive Guide](https://tdg.docbook.org/) or the [DocBook rocks! primer](https://web.archive.org/web/20200816233747/https://docbook.rocks/).
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