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lib.types: Add parentheses where description is ambiguous

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This commit is contained in:
Robert Hensing 2022-09-15 17:29:38 +01:00
parent 1158501e7c
commit 1cbe950384
2 changed files with 122 additions and 13 deletions
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53
lib/tests/misc.nix
View file

@ -1206,4 +1206,57 @@ runTests {
expr = strings.levenshteinAtMost 3 "hello" "Holla";
expected = true;
};
testTypeDescriptionInt = {
expr = (with types; int).description;
expected = "signed integer";
};
testTypeDescriptionListOfInt = {
expr = (with types; listOf int).description;
expected = "list of signed integer";
};
testTypeDescriptionListOfListOfInt = {
expr = (with types; listOf (listOf int)).description;
expected = "list of list of signed integer";
};
testTypeDescriptionListOfEitherStrOrBool = {
expr = (with types; listOf (either str bool)).description;
expected = "list of (string or boolean)";
};
testTypeDescriptionEitherListOfStrOrBool = {
expr = (with types; either (listOf bool) str).description;
expected = "(list of boolean) or string";
};
testTypeDescriptionEitherStrOrListOfBool = {
expr = (with types; either str (listOf bool)).description;
expected = "string or list of boolean";
};
testTypeDescriptionOneOfListOfStrOrBool = {
expr = (with types; oneOf [ (listOf bool) str ]).description;
expected = "(list of boolean) or string";
};
testTypeDescriptionOneOfListOfStrOrBoolOrNumber = {
expr = (with types; oneOf [ (listOf bool) str number ]).description;
expected = "(list of boolean) or string or signed integer or floating point number";
};
testTypeDescriptionEitherListOfBoolOrEitherStringOrNumber = {
expr = (with types; either (listOf bool) (either str number)).description;
expected = "(list of boolean) or string or signed integer or floating point number";
};
testTypeDescriptionEitherEitherListOfBoolOrStringOrNumber = {
expr = (with types; either (either (listOf bool) str) number).description;
expected = "(list of boolean) or string or signed integer or floating point number";
};
testTypeDescriptionEitherNullOrBoolOrString = {
expr = (with types; either (nullOr bool) str).description;
expected = "null or boolean or string";
};
testTypeDescriptionEitherListOfEitherBoolOrStrOrInt = {
expr = (with types; either (listOf (either bool str)) int).description;
expected = "(list of (boolean or string)) or signed integer";
};
testTypeDescriptionEitherIntOrListOrEitherBoolOrStr = {
expr = (with types; either int (listOf (either bool str))).description;
expected = "signed integer or list of (boolean or string)";
};
}

82
lib/types.nix
View file

@ -113,6 +113,12 @@ rec {
name
, # Description of the type, defined recursively by embedding the wrapped type if any.
description ? null
# A hint for whether or not this description needs parentheses. Possible values:
# - "noun": a simple noun phrase such as "positive integer"
# - "conjunction": a phrase with a potentially ambiguous "or" connective.
# - "composite": a phrase with an "of" connective
# See the `optionDescriptionPhrase` function.
, descriptionClass ? null
, # Function applied to each definition that should return true if
# its type-correct, false otherwise.
check ? (x: true)
@ -158,10 +164,36 @@ rec {
nestedTypes ? {}
}:
{ _type = "option-type";
inherit name check merge emptyValue getSubOptions getSubModules substSubModules typeMerge functor deprecationMessage nestedTypes;
inherit
name check merge emptyValue getSubOptions getSubModules substSubModules
typeMerge functor deprecationMessage nestedTypes descriptionClass;
description = if description == null then name else description;
};
# optionDescriptionPhrase :: (str -> bool) -> optionType -> str
#
# Helper function for producing unambiguous but readable natural language
# descriptions of types.
#
# Parameters
#
# optionDescriptionPhase unparenthesize optionType
#
# `unparenthesize`: A function from descriptionClass string to boolean.
# It must return true when the class of phrase will fit unambiguously into
# the description of the caller.
#
# `optionType`: The option type to parenthesize or not.
# The option whose description we're returning.
#
# Return value
#
# The description of the `optionType`, with parentheses if there may be an
# ambiguity.
optionDescriptionPhrase = unparenthesize: t:
if unparenthesize (t.descriptionClass or null)
then t.description
else "(${t.description})";
# When adding new types don't forget to document them in
# nixos/doc/manual/development/option-types.xml!
@ -170,6 +202,7 @@ rec {
raw = mkOptionType rec {
name = "raw";
description = "raw value";
descriptionClass = "noun";
check = value: true;
merge = mergeOneOption;
};
@ -177,6 +210,7 @@ rec {
anything = mkOptionType {
name = "anything";
description = "anything";
descriptionClass = "noun";
check = value: true;
merge = loc: defs:
let
@ -216,12 +250,14 @@ rec {
};
unspecified = mkOptionType {
name = "unspecified";
name = "unspecified value";
descriptionClass = "noun";
};
bool = mkOptionType {
name = "bool";
description = "boolean";
descriptionClass = "noun";
check = isBool;
merge = mergeEqualOption;
};
@ -229,6 +265,7 @@ rec {
int = mkOptionType {
name = "int";
description = "signed integer";
descriptionClass = "noun";
check = isInt;
merge = mergeEqualOption;
};
@ -294,6 +331,7 @@ rec {
float = mkOptionType {
name = "float";
description = "floating point number";
descriptionClass = "noun";
check = isFloat;
merge = mergeEqualOption;
};
@ -325,6 +363,7 @@ rec {
str = mkOptionType {
name = "str";
description = "string";
descriptionClass = "noun";
check = isString;
merge = mergeEqualOption;
};
@ -332,6 +371,7 @@ rec {
nonEmptyStr = mkOptionType {
name = "nonEmptyStr";
description = "non-empty string";
descriptionClass = "noun";
check = x: str.check x && builtins.match "[ \t\n]*" x == null;
inherit (str) merge;
};
@ -344,6 +384,7 @@ rec {
mkOptionType {
name = "singleLineStr";
description = "(optionally newline-terminated) single-line string";
descriptionClass = "noun";
inherit check;
merge = loc: defs:
lib.removeSuffix "\n" (merge loc defs);
@ -352,6 +393,7 @@ rec {
strMatching = pattern: mkOptionType {
name = "strMatching ${escapeNixString pattern}";
description = "string matching the pattern ${pattern}";
descriptionClass = "noun";
check = x: str.check x && builtins.match pattern x != null;
inherit (str) merge;
};
@ -364,6 +406,7 @@ rec {
then "Concatenated string" # for types.string.
else "strings concatenated with ${builtins.toJSON sep}"
;
descriptionClass = "noun";
check = isString;
merge = loc: defs: concatStringsSep sep (getValues defs);
functor = (defaultFunctor name) // {
@ -387,7 +430,7 @@ rec {
passwdEntry = entryType: addCheck entryType (str: !(hasInfix ":" str || hasInfix "\n" str)) // {
name = "passwdEntry ${entryType.name}";
description = "${entryType.description}, not containing newlines or colons";
description = "${optionDescriptionPhrase (class: class == "noun") entryType}, not containing newlines or colons";
};
attrs = mkOptionType {
@ -407,6 +450,7 @@ rec {
# ("/nix/store/hash-foo"). These get a context added to them using builtins.storePath.
package = mkOptionType {
name = "package";
descriptionClass = "noun";
check = x: isDerivation x || isStorePath x;
merge = loc: defs:
let res = mergeOneOption loc defs;
@ -427,7 +471,8 @@ rec {
listOf = elemType: mkOptionType rec {
name = "listOf";
description = "list of ${elemType.description}";
description = "list of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
descriptionClass = "composite";
check = isList;
merge = loc: defs:
map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
@ -450,13 +495,14 @@ rec {
nonEmptyListOf = elemType:
let list = addCheck (types.listOf elemType) (l: l != []);
in list // {
description = "non-empty " + list.description;
description = "non-empty ${optionDescriptionPhrase (class: class == "noun") list}";
emptyValue = { }; # no .value attr, meaning unset
};
attrsOf = elemType: mkOptionType rec {
name = "attrsOf";
description = "attribute set of ${elemType.description}";
description = "attribute set of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
descriptionClass = "composite";
check = isAttrs;
merge = loc: defs:
mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
@ -479,7 +525,8 @@ rec {
# error that it's not defined. Use only if conditional definitions don't make sense.
lazyAttrsOf = elemType: mkOptionType rec {
name = "lazyAttrsOf";
description = "lazy attribute set of ${elemType.description}";
description = "lazy attribute set of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
descriptionClass = "composite";
check = isAttrs;
merge = loc: defs:
zipAttrsWith (name: defs:
@ -509,7 +556,7 @@ rec {
# Value of given type but with no merging (i.e. `uniq list`s are not concatenated).
uniq = elemType: mkOptionType rec {
name = "uniq";
inherit (elemType) description check;
inherit (elemType) description descriptionClass check;
merge = mergeOneOption;
emptyValue = elemType.emptyValue;
getSubOptions = elemType.getSubOptions;
@ -521,7 +568,7 @@ rec {
unique = { message }: type: mkOptionType rec {
name = "unique";
inherit (type) description check;
inherit (type) description descriptionClass check;
merge = mergeUniqueOption { inherit message; };
emptyValue = type.emptyValue;
getSubOptions = type.getSubOptions;
@ -534,7 +581,8 @@ rec {
# Null or value of ...
nullOr = elemType: mkOptionType rec {
name = "nullOr";
description = "null or ${elemType.description}";
description = "null or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") elemType}";
descriptionClass = "conjunction";
check = x: x == null || elemType.check x;
merge = loc: defs:
let nrNulls = count (def: def.value == null) defs; in
@ -552,7 +600,8 @@ rec {
functionTo = elemType: mkOptionType {
name = "functionTo";
description = "function that evaluates to a(n) ${elemType.description}";
description = "function that evaluates to a(n) ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
descriptionClass = "composite";
check = isFunction;
merge = loc: defs:
fnArgs: (mergeDefinitions (loc ++ [ "[function body]" ]) elemType (map (fn: { inherit (fn) file; value = fn.value fnArgs; }) defs)).mergedValue;
@ -578,6 +627,7 @@ rec {
deferredModuleWith = attrs@{ staticModules ? [] }: mkOptionType {
name = "deferredModule";
description = "module";
descriptionClass = "noun";
check = x: isAttrs x || isFunction x || path.check x;
merge = loc: defs: {
imports = staticModules ++ map (def: lib.setDefaultModuleLocation "${def.file}, via option ${showOption loc}" def.value) defs;
@ -603,6 +653,7 @@ rec {
optionType = mkOptionType {
name = "optionType";
description = "optionType";
descriptionClass = "noun";
check = value: value._type or null == "option-type";
merge = loc: defs:
if length defs == 1
@ -749,6 +800,10 @@ rec {
"value ${show (builtins.head values)} (singular enum)"
else
"one of ${concatMapStringsSep ", " show values}";
descriptionClass =
if builtins.length values < 2
then "noun"
else "conjunction";
check = flip elem values;
merge = mergeEqualOption;
functor = (defaultFunctor name) // { payload = values; binOp = a: b: unique (a ++ b); };
@ -757,7 +812,8 @@ rec {
# Either value of type `t1` or `t2`.
either = t1: t2: mkOptionType rec {
name = "either";
description = "${t1.description} or ${t2.description}";
description = "${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") t1} or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction" || class == "composite") t2}";
descriptionClass = "conjunction";
check = x: t1.check x || t2.check x;
merge = loc: defs:
let
@ -795,7 +851,7 @@ rec {
coercedType.description})";
mkOptionType rec {
name = "coercedTo";
description = "${finalType.description} or ${coercedType.description} convertible to it";
description = "${optionDescriptionPhrase (class: class == "noun") finalType} or ${optionDescriptionPhrase (class: class == "noun") coercedType} convertible to it";
check = x: (coercedType.check x && finalType.check (coerceFunc x)) || finalType.check x;
merge = loc: defs:
let