lix/doc/manual/generate-manpage.nix

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let
inherit (builtins)
attrNames
attrValues
concatMap
concatStringsSep
fromJSON
groupBy
length
lessThan
listToAttrs
mapAttrs
match
replaceStrings
sort
;
inherit (import <nix/utils.nix>)
attrsToList
concatStrings
filterAttrs
optionalString
squash
trim
unique
;
showStoreDocs = import <nix/generate-store-info.nix>;
in
inlineHTML: commandDump:
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let
commandInfo = fromJSON commandDump;
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showCommand = { command, details, filename, toplevel }:
let
result = ''
> **Warning** \
> This program is
> [**experimental**](@docroot@/contributing/experimental-features.md#xp-feature-nix-command)
> and its interface is subject to change.
# Name
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`${command}` - ${details.description}
# Synopsis
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${showSynopsis command details.args}
${maybeSubcommands}
${maybeProse}
${maybeOptions}
'';
showSynopsis = command: args:
let
showArgument = arg: "*${arg.label}*" + optionalString (! arg ? arity) "...";
arguments = concatStringsSep " " (map showArgument args);
in ''
`${command}` [*option*...] ${arguments}
'';
maybeSubcommands = optionalString (details ? commands && details.commands != {})
''
where *subcommand* is one of the following:
${subcommands}
'';
subcommands = if length categories > 1
then listCategories
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else listSubcommands details.commands;
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categories = sort (x: y: x.id < y.id) (unique (map (cmd: cmd.category) (attrValues details.commands)));
listCategories = concatStrings (map showCategory categories);
showCategory = cat: ''
**${toString cat.description}:**
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${listSubcommands (filterAttrs (n: v: v.category == cat) details.commands)}
'';
listSubcommands = cmds: concatStrings (attrValues (mapAttrs showSubcommand cmds));
showSubcommand = name: subcmd: ''
* [`${command} ${name}`](./${appendName filename name}.md) - ${subcmd.description}
'';
maybeProse =
# FIXME: this is a horrible hack to keep `nix help-stores` working.
# the correct answer to this is to remove that command and replace it
# by statically generated manpages or the output of something like `nix
# store info <store type>`.
let
help-stores = ''
${index}
${allStores}
'';
index = replaceStrings
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[ "@store-types@" "./local-store.md" "./local-daemon-store.md" ]
[ storesOverview "#local-store" "#local-daemon-store" ]
details.doc;
storesOverview =
let
showEntry = store:
"- [${store.name}](#${store.slug})";
in
concatStringsSep "\n" (map showEntry storesList) + "\n";
allStores = concatStringsSep "\n" (attrValues storePages);
storePages = listToAttrs
(map (s: { name = s.filename; value = s.page; }) storesList);
storesList = showStoreDocs {
storeInfo = commandInfo.stores;
inherit inlineHTML;
};
in
optionalString (details ? doc) (
if match "@store-types@" details.doc != [ ]
then help-stores
else details.doc
);
maybeOptions =
let
allVisibleOptions = filterAttrs
(_: o: ! o.hiddenCategory)
(details.flags // toplevel.flags);
in
optionalString (allVisibleOptions != { }) ''
# Options
${showOptions inlineHTML allVisibleOptions}
> **Note**
>
> See [`man nix.conf`](@docroot@/command-ref/conf-file.md#command-line-flags) for overriding configuration settings with command line flags.
'';
showOptions = inlineHTML: allOptions:
let
showCategory = cat: opts: ''
${optionalString (cat != "") "## ${cat}"}
${concatStringsSep "\n" (attrValues (mapAttrs showOption opts))}
'';
showOption = name: option:
let
result = trim ''
- ${item}
${option.description}
'';
item = if inlineHTML
then ''<span id="opt-${name}">[`--${name}`](#opt-${name})</span> ${shortName} ${labels}''
else "`--${name}` ${shortName} ${labels}";
shortName = optionalString
(option ? shortName)
("/ `-${option.shortName}`");
labels = optionalString
(option ? labels)
(concatStringsSep " " (map (s: "*${s}*") option.labels));
in result;
categories = mapAttrs
# Convert each group from a list of key-value pairs back to an attrset
(_: listToAttrs)
(groupBy
(cmd: cmd.value.category)
(attrsToList allOptions));
in concatStrings (attrValues (mapAttrs showCategory categories));
in squash result;
appendName = filename: name: (if filename == "nix" then "nix3" else filename) + "-" + name;
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processCommand = { command, details, filename, toplevel }:
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let
cmd = {
inherit command;
name = filename + ".md";
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value = showCommand { inherit command details filename toplevel; };
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};
subcommand = subCmd: processCommand {
command = command + " " + subCmd;
details = details.commands.${subCmd};
filename = appendName filename subCmd;
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inherit toplevel;
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};
in [ cmd ] ++ concatMap subcommand (attrNames details.commands or {});
manpages = processCommand {
command = "nix";
details = commandInfo.args;
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filename = "nix";
toplevel = commandInfo.args;
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};
tableOfContents = let
showEntry = page:
" - [${page.command}](command-ref/new-cli/${page.name})";
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in concatStringsSep "\n" (map showEntry manpages) + "\n";
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in (listToAttrs manpages) // { "SUMMARY.md" = tableOfContents; }