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

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docs: merge builtin-constants into builtins
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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: builtinsInfo:
let let
showBuiltin = name: { doc, args, arity, experimental-feature }: showBuiltin = name: { doc, type ? null, args ? [ ], experimental-feature ? null, impure-only ? false }:
let let
type' = optionalString (type != null) " (${type})";
experimentalNotice = optionalString (experimental-feature != null) '' experimentalNotice = optionalString (experimental-feature != null) ''
> **Note** > **Note**
> >
@ -18,18 +20,26 @@ let
> extra-experimental-features = ${experimental-feature} > extra-experimental-features = ${experimental-feature}
> ``` > ```
''; '';
impureNotice = optionalString impure-only ''
> **Note**
>
> Not available in [pure evaluation mode](@docroot@/command-ref/conf-file.md#conf-pure-eval).
'';
in in
squash '' squash ''
<dt id="builtins-${name}"> <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> </dt>
<dd> <dd>
${experimentalNotice} ${experimentalNotice}
${doc} ${doc}
${impureNotice}
</dd> </dd>
''; '';
listArgs = args: concatStringsSep " " (map (s: "<var>${s}</var>") args); listArgs = args: concatStringsSep "" (map (s: " <var>${s}</var>") args);
in in
concatStringsSep "\n" (attrValues (mapAttrs showBuiltin builtinsInfo)) 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) $(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 @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 @cat doc/manual/src/language/builtins-suffix.md >> $@.tmp
@mv $@.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) $(d)/language.json: $(doc_nix)
$(trace-gen) $(dummy-env) $(doc_nix) __dump-language > $@.tmp $(trace-gen) $(dummy-env) $(doc_nix) __dump-language > $@.tmp
@mv $@.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 # `@docroot@` is to be preserved for documenting the mechanism
# FIXME: maybe contributing guides should live right next to the code # FIXME: maybe contributing guides should live right next to the code
# instead of in the manual # 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) \ $(trace-gen) \
tmp="$$(mktemp -d)"; \ tmp="$$(mktemp -d)"; \
cp -r doc/manual "$$tmp"; \ cp -r doc/manual "$$tmp"; \

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

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

1
doc/manual/src/_redirects
View file

@ -29,6 +29,7 @@
/expressions/* /language/:splat 301! /expressions/* /language/:splat 301!
/language/values /language/types 301! /language/values /language/types 301!
/language/constructs /language/syntax 301! /language/constructs /language/syntax 301!
/language/builtin-constants /language/builtins 301!
/installation/installation /installation 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. This section lists the values and functions built into the Nix language evaluator.
All built-in functions are available through the global [`builtins`](./builtin-constants.md#builtins-builtins) constant. 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) - [`derivation`](#builtins-derivation)
- [`import`](#builtins-import) - [`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. 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. 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)) - [`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 --> <!-- 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. The function [`builtins.isBool`](builtins.md#builtins-isBool) can be used to determine if a value is a boolean.
### String {#type-string} ### 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 --> <!-- 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 ## Compound values

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

@ -74,7 +74,7 @@ struct EvalSettings : Config
R"( R"(
List of search paths to use for [lookup path](@docroot@/language/constructs/lookup-path.md) resolution. List of search paths to use for [lookup path](@docroot@/language/constructs/lookup-path.md) resolution.
This setting determines the value of 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 The default value is
@ -95,7 +95,7 @@ struct EvalSettings : Config
this, "", "eval-system", this, "", "eval-system",
R"( R"(
This option defines 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. 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 Otherwise, if it is defined as the empty string (the default), the value of the
[`system` ](#conf-system) [`system` ](#conf-system)
@ -116,7 +116,7 @@ struct EvalSettings : Config
R"( R"(
If set to `true`, the Nix evaluator will not allow access to any If set to `true`, the Nix evaluator will not allow access to any
files outside of 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 or to URIs outside of
[`allowed-uris`](@docroot@/command-ref/conf-file.md#conf-allowed-uris). [`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 - Restrict file system and network access to files specified by cryptographic hash
- Disable impure constants: - Disable impure constants:
- [`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem) - [`builtins.currentSystem`](@docroot@/language/builtins.md#builtins-currentSystem)
- [`builtins.currentTime`](@docroot@/language/builtin-constants.md#builtins-currentTime) - [`builtins.currentTime`](@docroot@/language/builtins.md#builtins-currentTime)
- [`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath) - [`builtins.nixPath`](@docroot@/language/builtins.md#builtins-nixPath)
- [`builtins.storePath`](@docroot@/language/builtin-constants.md#builtins-storePath) - [`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. - 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. 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 ```nix
<nixpkgs> <nixpkgs>
@ -4519,7 +4519,7 @@ void EvalState::createBaseEnv()
addConstant("builtins", v, { addConstant("builtins", v, {
.type = nAttrs, .type = nAttrs,
.doc = R"( .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: 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. 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 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 if the
[`eval-system`](#conf-eval-system) [`eval-system`](#conf-eval-system)
configuration option is set as the empty string. 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 an impure derivation cannot also be
[content-addressed](#xp-feature-ca-derivations). [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", .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; evalSettings.pureEval = false;
EvalState state({}, openStore("dummy://"), evalSettings); EvalState state({}, openStore("dummy://"), evalSettings);
auto res = nlohmann::json::object(); auto builtinsJson = nlohmann::json::object();
res["builtins"] = ({ for (auto & builtin : *state.baseEnv.values[0]->attrs()) {
auto builtinsJson = nlohmann::json::object(); auto b = nlohmann::json::object();
for (auto & builtin : *state.baseEnv.values[0]->attrs()) { if (!builtin.value->isPrimOp()) continue;
auto b = nlohmann::json::object(); auto primOp = builtin.value->primOp();
if (!builtin.value->isPrimOp()) continue; if (!primOp->doc) continue;
auto primOp = builtin.value->primOp(); b["args"] = primOp->args;
if (!primOp->doc) continue; b["doc"] = trim(stripIndentation(primOp->doc));
b["arity"] = primOp->arity; if (primOp->experimentalFeature)
b["args"] = primOp->args;
b["doc"] = trim(stripIndentation(primOp->doc));
b["experimental-feature"] = primOp->experimentalFeature; b["experimental-feature"] = primOp->experimentalFeature;
builtinsJson[state.symbols[builtin.name]] = std::move(b); builtinsJson[state.symbols[builtin.name]] = std::move(b);
} }
std::move(builtinsJson); for (auto & [name, info] : state.constantInfos) {
}); auto b = nlohmann::json::object();
res["constants"] = ({ if (!info.doc) continue;
auto constantsJson = nlohmann::json::object(); b["doc"] = trim(stripIndentation(info.doc));
for (auto & [name, info] : state.constantInfos) { b["type"] = showType(info.type, false);
auto c = nlohmann::json::object(); if (info.impureOnly)
if (!info.doc) continue; b["impure-only"] = true;
c["doc"] = trim(stripIndentation(info.doc)); builtinsJson[name] = std::move(b);
c["type"] = showType(info.type, false); }
c["impure-only"] = info.impureOnly; logger->cout("%s", builtinsJson);
constantsJson[name] = std::move(c);
}
std::move(constantsJson);
});
logger->cout("%s", res);
return; return;
} }