diff options
Diffstat (limited to 'nixos/lib/make-options-doc/default.nix')
| -rw-r--r-- | nixos/lib/make-options-doc/default.nix | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/nixos/lib/make-options-doc/default.nix b/nixos/lib/make-options-doc/default.nix new file mode 100644 index 000000000000..88e052106a28 --- /dev/null +++ b/nixos/lib/make-options-doc/default.nix @@ -0,0 +1,164 @@ +/* Generate JSON, XML and DocBook documentation for given NixOS options. + + Minimal example: + + { pkgs, }: + + let + eval = import (pkgs.path + "/nixos/lib/eval-config.nix") { + baseModules = [ + ../module.nix + ]; + modules = []; + }; + in pkgs.nixosOptionsDoc { + options = eval.options; + } + +*/ +{ pkgs +, lib +, options +, transformOptions ? lib.id # function for additional tranformations of the options +, revision ? "" # Specify revision for the options +}: + +let + # Replace functions by the string <function> + substFunction = x: + if builtins.isAttrs x then lib.mapAttrs (name: substFunction) x + else if builtins.isList x then map substFunction x + else if lib.isFunction x then "<function>" + else x; + + optionsListDesc = lib.flip map optionsListVisible + (opt: transformOptions opt + // lib.optionalAttrs (opt ? example) { example = substFunction opt.example; } + // lib.optionalAttrs (opt ? default) { default = substFunction opt.default; } + // lib.optionalAttrs (opt ? type) { type = substFunction opt.type; } + // lib.optionalAttrs (opt ? relatedPackages && opt.relatedPackages != []) { relatedPackages = genRelatedPackages opt.relatedPackages; } + ); + + # Generate DocBook documentation for a list of packages. This is + # what `relatedPackages` option of `mkOption` from + # ../../../lib/options.nix influences. + # + # Each element of `relatedPackages` can be either + # - a string: that will be interpreted as an attribute name from `pkgs`, + # - a list: that will be interpreted as an attribute path from `pkgs`, + # - an attrset: that can specify `name`, `path`, `package`, `comment` + # (either of `name`, `path` is required, the rest are optional). + genRelatedPackages = packages: + let + unpack = p: if lib.isString p then { name = p; } + else if lib.isList p then { path = p; } + else p; + describe = args: + let + title = args.title or null; + name = args.name or (lib.concatStringsSep "." args.path); + path = args.path or [ args.name ]; + package = args.package or (lib.attrByPath path (throw "Invalid package attribute path `${toString path}'") pkgs); + in "<listitem>" + + "<para><literal>${lib.optionalString (title != null) "${title} aka "}pkgs.${name} (${package.meta.name})</literal>" + + lib.optionalString (!package.meta.available) " <emphasis>[UNAVAILABLE]</emphasis>" + + ": ${package.meta.description or "???"}.</para>" + + lib.optionalString (args ? comment) "\n<para>${args.comment}</para>" + # Lots of `longDescription's break DocBook, so we just wrap them into <programlisting> + + lib.optionalString (package.meta ? longDescription) "\n<programlisting>${package.meta.longDescription}</programlisting>" + + "</listitem>"; + in "<itemizedlist>${lib.concatStringsSep "\n" (map (p: describe (unpack p)) packages)}</itemizedlist>"; + + # Custom "less" that pushes up all the things ending in ".enable*" + # and ".package*" + optionLess = a: b: + let + ise = lib.hasPrefix "enable"; + isp = lib.hasPrefix "package"; + cmp = lib.splitByAndCompare ise lib.compare + (lib.splitByAndCompare isp lib.compare lib.compare); + in lib.compareLists cmp a.loc b.loc < 0; + + # Remove invisible and internal options. + optionsListVisible = lib.filter (opt: opt.visible && !opt.internal) (lib.optionAttrSetToDocList options); + + # Customly sort option list for the man page. + optionsList = lib.sort optionLess optionsListDesc; + + # Convert the list of options into an XML file. + optionsXML = builtins.toFile "options.xml" (builtins.toXML optionsList); + + optionsNix = builtins.listToAttrs (map (o: { name = o.name; value = removeAttrs o ["name" "visible" "internal"]; }) optionsList); + + # TODO: declarations: link to github + singleAsciiDoc = name: value: '' + == ${name} + + ${value.description} + + [discrete] + === details + + Type:: ${value.type} + ${ if lib.hasAttr "default" value + then '' + Default:: + + + ---- + ${builtins.toJSON value.default} + ---- + '' + else "No Default:: {blank}" + } + ${ if value.readOnly + then "Read Only:: {blank}" + else "" + } + ${ if lib.hasAttr "example" value + then '' + Example:: + + + ---- + ${builtins.toJSON value.example} + ---- + '' + else "No Example:: {blank}" + } + ''; + +in rec { + inherit optionsNix; + + optionsAsciiDoc = lib.concatStringsSep "\n" (lib.mapAttrsToList singleAsciiDoc optionsNix); + + optionsJSON = pkgs.runCommand "options.json" + { meta.description = "List of NixOS options in JSON format"; + } + '' + # Export list of options in different format. + dst=$out/share/doc/nixos + mkdir -p $dst + + cp ${builtins.toFile "options.json" (builtins.unsafeDiscardStringContext (builtins.toJSON optionsNix))} $dst/options.json + + mkdir -p $out/nix-support + echo "file json $dst/options.json" >> $out/nix-support/hydra-build-products + ''; # */ + + optionsDocBook = pkgs.runCommand "options-docbook.xml" {} '' + optionsXML=${optionsXML} + if grep /nixpkgs/nixos/modules $optionsXML; then + echo "The manual appears to depend on the location of Nixpkgs, which is bad" + echo "since this prevents sharing via the NixOS channel. This is typically" + echo "caused by an option default that refers to a relative path (see above" + echo "for hints about the offending path)." + exit 1 + fi + + ${pkgs.libxslt.bin}/bin/xsltproc \ + --stringparam revision '${revision}' \ + -o intermediate.xml ${./options-to-docbook.xsl} $optionsXML + ${pkgs.libxslt.bin}/bin/xsltproc \ + -o "$out" ${./postprocess-option-descriptions.xsl} intermediate.xml + ''; +} |