forked from mirrors/nixpkgs
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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