nix-super/doc/manual/generate-settings.nix

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let
inherit (builtins) attrValues concatStringsSep isAttrs isBool mapAttrs;
inherit (import <nix/utils.nix>) concatStrings indent optionalString squash;
in
# `inlineHTML` is a hack to accommodate inconsistent output from `lowdown`
{ prefix, inlineHTML ? true }: settingsInfo:
let
showSetting = prefix: setting: { description, documentDefault, defaultValue, aliases, value, experimentalFeature }:
let
result = squash ''
- ${item}
${indent " " body}
'';
item = if inlineHTML
then ''<span id="${prefix}-${setting}">[`${setting}`](#${prefix}-${setting})</span>''
else "`${setting}`";
# separate body to cleanly handle indentation
body = ''
${description}
${experimentalFeatureNote}
**Default:** ${showDefault documentDefault defaultValue}
${showAliases aliases}
'';
experimentalFeatureNote = optionalString (experimentalFeature != null) ''
> **Warning**
>
> This setting is part of an
> [experimental feature](@docroot@/contributing/experimental-features.md).
>
> To change this setting, make sure the
> [`${experimentalFeature}` experimental feature](@docroot@/contributing/experimental-features.md#xp-feature-${experimentalFeature})
> is enabled.
> For example, include the following in [`nix.conf`](@docroot@/command-ref/conf-file.md):
>
> ```
> extra-experimental-features = ${experimentalFeature}
> ${setting} = ...
> ```
'';
showDefault = documentDefault: defaultValue:
if documentDefault then
# a StringMap value type is specified as a string, but
# this shows the value type. The empty stringmap is `null` in
# JSON, but that converts to `{ }` here.
if defaultValue == "" || defaultValue == [] || isAttrs defaultValue
then "*empty*"
else if isBool defaultValue then
if defaultValue then "`true`" else "`false`"
else "`${toString defaultValue}`"
else "*machine-specific*";
showAliases = aliases:
optionalString (aliases != [])
"**Deprecated alias:** ${(concatStringsSep ", " (map (s: "`${s}`") aliases))}";
in result;
in concatStrings (attrValues (mapAttrs (showSetting prefix) settingsInfo))