767485a0de
deprecate literalDocBook by adding a warning (that will not fire yet) to its uses and other docbook literal strings by adding optional warning message to mergeJSON.
191 lines
7.8 KiB
Nix
191 lines
7.8 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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, 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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}:
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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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> $out
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'';
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optionsJSON = pkgs.runCommand "options.json"
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{ meta.description = "List of NixOS options in JSON format";
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buildInputs = [
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pkgs.brotli
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(let
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self = (pkgs.python3Minimal.override {
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inherit self;
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includeSiteCustomize = true;
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});
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in self.withPackages (p: [ p.mistune ]))
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];
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options = builtins.toFile "options.json"
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(builtins.unsafeDiscardStringContext (builtins.toJSON optionsNix));
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# merge with an empty set if baseOptionsJSON is null to run markdown
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# processing on the input options
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baseJSON =
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if baseOptionsJSON == null
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then builtins.toFile "base.json" "{}"
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else baseOptionsJSON;
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}
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''
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# Export list of options in different format.
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dst=$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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${lib.optionalString (! allowDocBook) "--error-on-docbook"} \
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$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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-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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