200 lines
8.4 KiB
Nix
200 lines
8.4 KiB
Nix
/* Generate JSON, XML and DocBook documentation for given NixOS options.
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Minimal example:
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{ pkgs, }:
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let
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eval = import (pkgs.path + "/nixos/lib/eval-config.nix") {
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baseModules = [
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../module.nix
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];
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modules = [];
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};
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in pkgs.nixosOptionsDoc {
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options = eval.options;
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}
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*/
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{ pkgs
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, lib
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, options
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, transformOptions ? lib.id # function for additional tranformations of the options
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, documentType ? "appendix" # TODO deprecate "appendix" in favor of "none"
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# and/or rename function to moduleOptionDoc for clean slate
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# If you include more than one option list into a document, you need to
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# provide different ids.
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, variablelistId ? "configuration-variable-list"
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# Strig to prefix to the option XML/HTML id attributes.
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, optionIdPrefix ? "opt-"
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, revision ? "" # Specify revision for the options
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# a set of options the docs we are generating will be merged into, as if by recursiveUpdate.
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# used to split the options doc build into a static part (nixos/modules) and a dynamic part
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# (non-nixos modules imported via configuration.nix, other module sources).
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, baseOptionsJSON ? null
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# instead of printing warnings for eg options with missing descriptions (which may be lost
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# by nix build unless -L is given), emit errors instead and fail the build
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, warningsAreErrors ? true
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# allow docbook option docs if `true`. only markdown documentation is allowed when set to
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# `false`, and a different renderer may be used with different bugs and performance
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# characteristics but (hopefully) indistinguishable output.
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, allowDocBook ? true
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# whether lib.mdDoc is required for descriptions to be read as markdown.
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, markdownByDefault ? false
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}:
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let
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# Make a value safe for JSON. Functions are replaced by the string "<function>",
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# derivations are replaced with an attrset
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# { _type = "derivation"; name = <name of that derivation>; }.
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# We need to handle derivations specially because consumers want to know about them,
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# but we can't easily use the type,name subset of keys (since type is often used as
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# a module option and might cause confusion). Use _type,name instead to the same
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# effect, since _type is already used by the module system.
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substSpecial = x:
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if lib.isDerivation x then { _type = "derivation"; name = x.name; }
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else if builtins.isAttrs x then lib.mapAttrs (name: substSpecial) x
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else if builtins.isList x then map substSpecial x
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else if lib.isFunction x then "<function>"
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else x;
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rawOpts = lib.optionAttrSetToDocList options;
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transformedOpts = map transformOptions rawOpts;
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filteredOpts = lib.filter (opt: opt.visible && !opt.internal) transformedOpts;
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optionsList = lib.flip map filteredOpts
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(opt: opt
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// lib.optionalAttrs (opt ? example) { example = substSpecial opt.example; }
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// lib.optionalAttrs (opt ? default) { default = substSpecial opt.default; }
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// lib.optionalAttrs (opt ? type) { type = substSpecial opt.type; }
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// lib.optionalAttrs (opt ? relatedPackages && opt.relatedPackages != []) { relatedPackages = genRelatedPackages opt.relatedPackages opt.name; }
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);
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# Generate DocBook documentation for a list of packages. This is
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# what `relatedPackages` option of `mkOption` from
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# ../../../lib/options.nix influences.
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#
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# Each element of `relatedPackages` can be either
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# - a string: that will be interpreted as an attribute name from `pkgs` and turned into a link
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# to search.nixos.org,
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# - a list: that will be interpreted as an attribute path from `pkgs` and turned into a link
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# to search.nixos.org,
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# - an attrset: that can specify `name`, `path`, `comment`
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# (either of `name`, `path` is required, the rest are optional).
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#
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# NOTE: No checks against `pkgs` are made to ensure that the referenced package actually exists.
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# Such checks are not compatible with option docs caching.
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genRelatedPackages = packages: optName:
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let
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unpack = p: if lib.isString p then { name = p; }
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else if lib.isList p then { path = p; }
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else p;
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describe = args:
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let
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title = args.title or null;
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name = args.name or (lib.concatStringsSep "." args.path);
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in ''
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<listitem>
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<para>
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<link xlink:href="https://search.nixos.org/packages?show=${name}&sort=relevance&query=${name}">
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<literal>${lib.optionalString (title != null) "${title} aka "}pkgs.${name}</literal>
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</link>
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</para>
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${lib.optionalString (args ? comment) "<para>${args.comment}</para>"}
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</listitem>
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'';
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in "<itemizedlist>${lib.concatStringsSep "\n" (map (p: describe (unpack p)) packages)}</itemizedlist>";
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optionsNix = builtins.listToAttrs (map (o: { name = o.name; value = removeAttrs o ["name" "visible" "internal"]; }) optionsList);
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in rec {
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inherit optionsNix;
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optionsAsciiDoc = pkgs.runCommand "options.adoc" {} ''
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${pkgs.python3Minimal}/bin/python ${./generateAsciiDoc.py} \
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< ${optionsJSON}/share/doc/nixos/options.json \
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> $out
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'';
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optionsCommonMark = pkgs.runCommand "options.md" {} ''
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${pkgs.python3Minimal}/bin/python ${./generateCommonMark.py} \
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< ${optionsJSON}/share/doc/nixos/options.json \
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> $out
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'';
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optionsJSON = pkgs.runCommand "options.json"
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{ meta.description = "List of NixOS options in JSON format";
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nativeBuildInputs = [
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pkgs.brotli
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(let
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# python3Minimal can't be overridden with packages on Darwin, due to a missing framework.
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# Instead of modifying stdenv, we take the easy way out, since most people on Darwin will
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# just be hacking on the Nixpkgs manual (which also uses make-options-doc).
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python = if pkgs.stdenv.isDarwin then pkgs.python3 else pkgs.python3Minimal;
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self = (python.override {
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inherit self;
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includeSiteCustomize = true;
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});
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in self.withPackages (p: [ p.mistune ]))
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];
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options = builtins.toFile "options.json"
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(builtins.unsafeDiscardStringContext (builtins.toJSON optionsNix));
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# merge with an empty set if baseOptionsJSON is null to run markdown
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# processing on the input options
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baseJSON =
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if baseOptionsJSON == null
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then builtins.toFile "base.json" "{}"
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else baseOptionsJSON;
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}
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''
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# Export list of options in different format.
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dst=$out/share/doc/nixos
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mkdir -p $dst
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python ${./mergeJSON.py} \
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${lib.optionalString warningsAreErrors "--warnings-are-errors"} \
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${lib.optionalString (! allowDocBook) "--error-on-docbook"} \
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${lib.optionalString markdownByDefault "--markdown-by-default"} \
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$baseJSON $options \
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> $dst/options.json
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brotli -9 < $dst/options.json > $dst/options.json.br
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mkdir -p $out/nix-support
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echo "file json $dst/options.json" >> $out/nix-support/hydra-build-products
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echo "file json-br $dst/options.json.br" >> $out/nix-support/hydra-build-products
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'';
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# Convert options.json into an XML file.
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# The actual generation of the xml file is done in nix purely for the convenience
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# of not having to generate the xml some other way
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optionsXML = pkgs.runCommand "options.xml" {} ''
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export NIX_STORE_DIR=$TMPDIR/store
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export NIX_STATE_DIR=$TMPDIR/state
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${pkgs.nix}/bin/nix-instantiate \
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--eval --xml --strict ${./optionsJSONtoXML.nix} \
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--argstr file ${optionsJSON}/share/doc/nixos/options.json \
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> "$out"
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'';
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optionsDocBook = pkgs.runCommand "options-docbook.xml" {} ''
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optionsXML=${optionsXML}
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if grep /nixpkgs/nixos/modules $optionsXML; then
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echo "The manual appears to depend on the location of Nixpkgs, which is bad"
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echo "since this prevents sharing via the NixOS channel. This is typically"
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echo "caused by an option default that refers to a relative path (see above"
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echo "for hints about the offending path)."
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exit 1
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fi
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${pkgs.python3Minimal}/bin/python ${./sortXML.py} $optionsXML sorted.xml
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${pkgs.libxslt.bin}/bin/xsltproc \
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--stringparam documentType '${documentType}' \
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--stringparam revision '${revision}' \
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--stringparam variablelistId '${variablelistId}' \
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--stringparam optionIdPrefix '${optionIdPrefix}' \
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-o intermediate.xml ${./options-to-docbook.xsl} sorted.xml
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${pkgs.libxslt.bin}/bin/xsltproc \
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-o "$out" ${./postprocess-option-descriptions.xsl} intermediate.xml
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'';
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}
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