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Merge pull request #11059 from rhendric/rhendric/reference-manual

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docs: merge builtin-constants into builtins
This commit is contained in:
John Ericson 2024-07-07 21:47:33 -04:00 committed by GitHub
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16 changed files with 62 additions and 100 deletions
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31
doc/manual/generate-builtin-constants.nix
View file

@ -1,31 +0,0 @@
let
inherit (builtins) concatStringsSep attrValues mapAttrs;
inherit (import <nix/utils.nix>) optionalString squash;
in
builtinsInfo:
let
showBuiltin = name: { doc, type, impure-only }:
let
type' = optionalString (type != null) " (${type})";
impureNotice = optionalString impure-only ''
> **Note**
>
> Not available in [pure evaluation mode](@docroot@/command-ref/conf-file.md#conf-pure-eval).
'';
in
squash ''
<dt id="builtins-${name}">
<a href="#builtins-${name}"><code>${name}</code></a>${type'}
</dt>
<dd>
${doc}
${impureNotice}
</dd>
'';
in
concatStringsSep "\n" (attrValues (mapAttrs showBuiltin builtinsInfo))

16
doc/manual/generate-builtins.nix
View file

@ -5,8 +5,10 @@ in
builtinsInfo:
let
showBuiltin = name: { doc, args, arity, experimental-feature }:
showBuiltin = name: { doc, type ? null, args ? [ ], experimental-feature ? null, impure-only ? false }:
let
type' = optionalString (type != null) " (${type})";
experimentalNotice = optionalString (experimental-feature != null) ''
> **Note**
>
@ -18,18 +20,26 @@ let
> extra-experimental-features = ${experimental-feature}
> ```
'';
impureNotice = optionalString impure-only ''
> **Note**
>
> Not available in [pure evaluation mode](@docroot@/command-ref/conf-file.md#conf-pure-eval).
'';
in
squash ''
<dt id="builtins-${name}">
<a href="#builtins-${name}"><code>${name} ${listArgs args}</code></a>
<a href="#builtins-${name}"><code>${name}${listArgs args}</code></a>${type'}
</dt>
<dd>
${experimentalNotice}
${doc}
${impureNotice}
</dd>
'';
listArgs = args: concatStringsSep " " (map (s: "<var>${s}</var>") args);
listArgs = args: concatStringsSep "" (map (s: " <var>${s}</var>") args);
in
concatStringsSep "\n" (attrValues (mapAttrs showBuiltin builtinsInfo))

10
doc/manual/local.mk
View file

@ -140,16 +140,10 @@ $(d)/xp-features.json: $(doc_nix)
$(d)/src/language/builtins.md: $(d)/language.json $(d)/generate-builtins.nix $(d)/src/language/builtins-prefix.md $(doc_nix)
@cat doc/manual/src/language/builtins-prefix.md > $@.tmp
$(trace-gen) $(nix-eval) --expr 'import doc/manual/generate-builtins.nix (builtins.fromJSON (builtins.readFile $<)).builtins' >> $@.tmp;
$(trace-gen) $(nix-eval) --expr 'import doc/manual/generate-builtins.nix (builtins.fromJSON (builtins.readFile $<))' >> $@.tmp;
@cat doc/manual/src/language/builtins-suffix.md >> $@.tmp
@mv $@.tmp $@
$(d)/src/language/builtin-constants.md: $(d)/language.json $(d)/generate-builtin-constants.nix $(d)/src/language/builtin-constants-prefix.md $(doc_nix)
@cat doc/manual/src/language/builtin-constants-prefix.md > $@.tmp
$(trace-gen) $(nix-eval) --expr 'import doc/manual/generate-builtin-constants.nix (builtins.fromJSON (builtins.readFile $<)).constants' >> $@.tmp;
@cat doc/manual/src/language/builtin-constants-suffix.md >> $@.tmp
@mv $@.tmp $@
$(d)/language.json: $(doc_nix)
$(trace-gen) $(dummy-env) $(doc_nix) __dump-language > $@.tmp
@mv $@.tmp $@
@ -217,7 +211,7 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
# `@docroot@` is to be preserved for documenting the mechanism
# FIXME: maybe contributing guides should live right next to the code
# instead of in the manual
$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/anchors.jq $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/store/types $(d)/src/command-ref/new-cli $(d)/src/contributing/experimental-feature-descriptions.md $(d)/src/command-ref/conf-file.md $(d)/src/language/builtins.md $(d)/src/language/builtin-constants.md $(d)/src/release-notes/rl-next.md $(d)/src/figures $(d)/src/favicon.png $(d)/src/favicon.svg
$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/anchors.jq $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/store/types $(d)/src/command-ref/new-cli $(d)/src/contributing/experimental-feature-descriptions.md $(d)/src/command-ref/conf-file.md $(d)/src/language/builtins.md $(d)/src/release-notes/rl-next.md $(d)/src/figures $(d)/src/favicon.png $(d)/src/favicon.svg
$(trace-gen) \
tmp="$$(mktemp -d)"; \
cp -r doc/manual "$$tmp"; \

9
doc/manual/src/SUMMARY.md.in
View file

@ -32,11 +32,10 @@
- [String interpolation](language/string-interpolation.md)
- [Lookup path](language/constructs/lookup-path.md)
- [Operators](language/operators.md)
- [Derivations](language/derivations.md)
- [Advanced Attributes](language/advanced-attributes.md)
- [Import From Derivation](language/import-from-derivation.md)
- [Built-in Constants](language/builtin-constants.md)
- [Built-in Functions](language/builtins.md)
- [Built-ins](language/builtins.md)
- [Derivations](language/derivations.md)
- [Advanced Attributes](language/advanced-attributes.md)
- [Import From Derivation](language/import-from-derivation.md)
- [Package Management](package-management/index.md)
- [Profiles](package-management/profiles.md)
- [Garbage Collection](package-management/garbage-collection.md)

1
doc/manual/src/_redirects
View file

@ -29,6 +29,7 @@
/expressions/* /language/:splat 301!
/language/values /language/types 301!
/language/constructs /language/syntax 301!
/language/builtin-constants /language/builtins 301!
/installation/installation /installation 301!

5
doc/manual/src/language/builtin-constants-prefix.md
View file

@ -1,5 +0,0 @@
# Built-in Constants
These constants are built into the Nix language evaluator:
<dl>

1
doc/manual/src/language/builtin-constants-suffix.md
View file

@ -1 +0,0 @@
</dl>

10
doc/manual/src/language/builtins-prefix.md
View file

@ -1,9 +1,11 @@
# Built-in Functions
# Built-ins
This section lists the functions built into the Nix language evaluator.
All built-in functions are available through the global [`builtins`](./builtin-constants.md#builtins-builtins) constant.
This section lists the values and functions built into the Nix language evaluator.
All built-ins are available through the global [`builtins`](#builtins-builtins) constant.
For convenience, some built-ins can be accessed directly:
Some built-ins are also exposed directly in the global scope:
<!-- TODO(@rhendric, #10970): this list is incomplete -->
- [`derivation`](#builtins-derivation)
- [`import`](#builtins-import)

2
doc/manual/src/language/constructs/lookup-path.md
View file

@ -6,7 +6,7 @@
A lookup path is an identifier with an optional path suffix that resolves to a [path value](@docroot@/language/types.md#type-path) if the identifier matches a search path entry.
The value of a lookup path is determined by [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath).
The value of a lookup path is determined by [`builtins.nixPath`](@docroot@/language/builtins.md#builtins-nixPath).
See [`builtins.findFile`](@docroot@/language/builtins.md#builtins-findFile) for details on lookup path resolution.

2
doc/manual/src/language/derivations.md
View file

@ -64,7 +64,7 @@ It outputs an attribute set, and produces a [store derivation] as a side effect
> }
> ```
>
> [`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem) has the value of the [`system` configuration option], and defaults to the system type of the current Nix installation.
> [`builtins.currentSystem`](@docroot@/language/builtins.md#builtins-currentSystem) has the value of the [`system` configuration option], and defaults to the system type of the current Nix installation.
- [`builder`]{#attr-builder} ([Path](@docroot@/language/types.md#type-path) | [String](@docroot@/language/types.md#type-string))

4
doc/manual/src/language/types.md
View file

@ -37,7 +37,7 @@ A _boolean_ in the Nix language is one of _true_ or _false_.
<!-- TODO: mention the top-level environment -->
These values are available as attributes of [`builtins`](builtin-constants.md#builtins-builtins) as [`builtins.true`](builtin-constants.md#builtins-true) and [`builtins.false`](builtin-constants.md#builtins-false).
These values are available as attributes of [`builtins`](builtins.md#builtins-builtins) as [`builtins.true`](builtins.md#builtins-true) and [`builtins.false`](builtins.md#builtins-false).
The function [`builtins.isBool`](builtins.md#builtins-isBool) can be used to determine if a value is a boolean.
### String {#type-string}
@ -60,7 +60,7 @@ There is a single value of type _null_ in the Nix language.
<!-- TODO: mention the top-level environment -->
This value is available as an attribute on the [`builtins`](builtin-constants.md#builtins-builtins) attribute set as [`builtins.null`](builtin-constants.md#builtins-null).
This value is available as an attribute on the [`builtins`](builtins.md#builtins-builtins) attribute set as [`builtins.null`](builtins.md#builtins-null).
## Compound values

14
src/libexpr/eval-settings.hh
View file

@ -74,7 +74,7 @@ struct EvalSettings : Config
R"(
List of search paths to use for [lookup path](@docroot@/language/constructs/lookup-path.md) resolution.
This setting determines the value of
[`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath) and can be used with [`builtins.findFile`](@docroot@/language/builtin-constants.md#builtins-findFile).
[`builtins.nixPath`](@docroot@/language/builtins.md#builtins-nixPath) and can be used with [`builtins.findFile`](@docroot@/language/builtins.md#builtins-findFile).
The default value is
@ -95,7 +95,7 @@ struct EvalSettings : Config
this, "", "eval-system",
R"(
This option defines
[`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem)
[`builtins.currentSystem`](@docroot@/language/builtins.md#builtins-currentSystem)
in the Nix language if it is set as a non-empty string.
Otherwise, if it is defined as the empty string (the default), the value of the
[`system` ](#conf-system)
@ -116,7 +116,7 @@ struct EvalSettings : Config
R"(
If set to `true`, the Nix evaluator will not allow access to any
files outside of
[`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath),
[`builtins.nixPath`](@docroot@/language/builtins.md#builtins-nixPath),
or to URIs outside of
[`allowed-uris`](@docroot@/command-ref/conf-file.md#conf-allowed-uris).
)"};
@ -127,10 +127,10 @@ struct EvalSettings : Config
- Restrict file system and network access to files specified by cryptographic hash
- Disable impure constants:
- [`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem)
- [`builtins.currentTime`](@docroot@/language/builtin-constants.md#builtins-currentTime)
- [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath)
- [`builtins.storePath`](@docroot@/language/builtin-constants.md#builtins-storePath)
- [`builtins.currentSystem`](@docroot@/language/builtins.md#builtins-currentSystem)
- [`builtins.currentTime`](@docroot@/language/builtins.md#builtins-currentTime)
- [`builtins.nixPath`](@docroot@/language/builtins.md#builtins-nixPath)
- [`builtins.storePath`](@docroot@/language/builtins.md#builtins-storePath)
)"
};

4
src/libexpr/primops.cc
View file

@ -1872,7 +1872,7 @@ static RegisterPrimOp primop_findFile(PrimOp {
- If the suffix is found inside that directory, then the entry is a match.
The combined absolute path of the directory (now downloaded if need be) and the suffix is returned.
[Lookup path](@docroot@/language/constructs/lookup-path.md) expressions are [desugared](https://en.wikipedia.org/wiki/Syntactic_sugar) using this and [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath):
[Lookup path](@docroot@/language/constructs/lookup-path.md) expressions are [desugared](https://en.wikipedia.org/wiki/Syntactic_sugar) using this and [`builtins.nixPath`](#builtins-nixPath):
```nix
<nixpkgs>
@ -4519,7 +4519,7 @@ void EvalState::createBaseEnv()
addConstant("builtins", v, {
.type = nAttrs,
.doc = R"(
Contains all the [built-in functions](@docroot@/language/builtins.md) and values.
Contains all the built-in functions and values.
Since built-in functions were added over time, [testing for attributes](./operators.md#has-attribute) in `builtins` can be used for graceful fallback on older Nix installations:

2
src/libstore/globals.hh
View file

@ -228,7 +228,7 @@ public:
While you can force Nix to run a Darwin-specific `builder` executable on a Linux machine, the result would obviously be wrong.
This value is available in the Nix language as
[`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem)
[`builtins.currentSystem`](@docroot@/language/builtins.md#builtins-currentSystem)
if the
[`eval-system`](#conf-eval-system)
configuration option is set as the empty string.

2
src/libutil/experimental-features.cc
View file

@ -66,7 +66,7 @@ constexpr std::array<ExperimentalFeatureDetails, numXpFeatures> xpFeatureDetails
an impure derivation cannot also be
[content-addressed](#xp-feature-ca-derivations).
This is a more explicit alternative to using [`builtins.currentTime`](@docroot@/language/builtin-constants.md#builtins-currentTime).
This is a more explicit alternative to using [`builtins.currentTime`](@docroot@/language/builtins.md#builtins-currentTime).
)",
.trackingUrl = "https://github.com/NixOS/nix/milestone/42",
},

49
src/nix/main.cc
View file

@ -419,35 +419,28 @@ void mainWrapped(int argc, char * * argv)
};
evalSettings.pureEval = false;
EvalState state({}, openStore("dummy://"), evalSettings);
auto res = nlohmann::json::object();
res["builtins"] = ({
auto builtinsJson = nlohmann::json::object();
for (auto & builtin : *state.baseEnv.values[0]->attrs()) {
auto b = nlohmann::json::object();
if (!builtin.value->isPrimOp()) continue;
auto primOp = builtin.value->primOp();
if (!primOp->doc) continue;
b["arity"] = primOp->arity;
b["args"] = primOp->args;
b["doc"] = trim(stripIndentation(primOp->doc));
auto builtinsJson = nlohmann::json::object();
for (auto & builtin : *state.baseEnv.values[0]->attrs()) {
auto b = nlohmann::json::object();
if (!builtin.value->isPrimOp()) continue;
auto primOp = builtin.value->primOp();
if (!primOp->doc) continue;
b["args"] = primOp->args;
b["doc"] = trim(stripIndentation(primOp->doc));
if (primOp->experimentalFeature)
b["experimental-feature"] = primOp->experimentalFeature;
builtinsJson[state.symbols[builtin.name]] = std::move(b);
}
std::move(builtinsJson);
});
res["constants"] = ({
auto constantsJson = nlohmann::json::object();
for (auto & [name, info] : state.constantInfos) {
auto c = nlohmann::json::object();
if (!info.doc) continue;
c["doc"] = trim(stripIndentation(info.doc));
c["type"] = showType(info.type, false);
c["impure-only"] = info.impureOnly;
constantsJson[name] = std::move(c);
}
std::move(constantsJson);
});
logger->cout("%s", res);
builtinsJson[state.symbols[builtin.name]] = std::move(b);
}
for (auto & [name, info] : state.constantInfos) {
auto b = nlohmann::json::object();
if (!info.doc) continue;
b["doc"] = trim(stripIndentation(info.doc));
b["type"] = showType(info.type, false);
if (info.impureOnly)
b["impure-only"] = true;
builtinsJson[name] = std::move(b);
}
logger->cout("%s", builtinsJson);
return;
}