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lib.types: Improve descriptions of composed types that have commas

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Type:   either ints.positive (enum ["auto"])
Before: positive integer, meaning >0 or value "auto" (singular enum)
After:  positive integer, meaning >0, or value "auto" (singular enum)
This commit is contained in:
Robert Hensing 2023-12-23 11:40:16 +01:00
parent e525be5a07
commit 6f4d0b5261
2 changed files with 31 additions and 3 deletions
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12
lib/tests/misc.nix
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@ -1959,6 +1959,18 @@ runTests {
expr = (with types; int).description;
expected = "signed integer";
};
testTypeDescriptionIntsPositive = {
expr = (with types; ints.positive).description;
expected = "positive integer, meaning >0";
};
testTypeDescriptionIntsPositiveOrEnumAuto = {
expr = (with types; either ints.positive (enum ["auto"])).description;
expected = ''positive integer, meaning >0, or value "auto" (singular enum)'';
};
testTypeDescriptionListOfPositive = {
expr = (with types; listOf ints.positive).description;
expected = "list of (positive integer, meaning >0)";
};
testTypeDescriptionListOfInt = {
expr = (with types; listOf int).description;
expected = "list of signed integer";

22
lib/types.nix
View File

@ -113,9 +113,14 @@ rec {
, # 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.
# - "noun": a noun phrase
# Example description: "positive integer",
# - "conjunction": a phrase with a potentially ambiguous "or" connective
# Example description: "int or string"
# - "composite": a phrase with an "of" connective
# Example description: "list of string"
# - "nonRestrictiveClause": a noun followed by a comma and a clause
# Example description: "positive integer, meaning >0"
# See the `optionDescriptionPhrase` function.
, descriptionClass ? null
, # DO NOT USE WITHOUT KNOWING WHAT YOU ARE DOING!
@ -338,10 +343,12 @@ rec {
unsigned = addCheck types.int (x: x >= 0) // {
name = "unsignedInt";
description = "unsigned integer, meaning >=0";
descriptionClass = "nonRestrictiveClause";
};
positive = addCheck types.int (x: x > 0) // {
name = "positiveInt";
description = "positive integer, meaning >0";
descriptionClass = "nonRestrictiveClause";
};
u8 = unsign 8 256;
u16 = unsign 16 65536;
@ -383,10 +390,12 @@ rec {
nonnegative = addCheck number (x: x >= 0) // {
name = "numberNonnegative";
description = "nonnegative integer or floating point number, meaning >=0";
descriptionClass = "nonRestrictiveClause";
};
positive = addCheck number (x: x > 0) // {
name = "numberPositive";
description = "positive integer or floating point number, meaning >0";
descriptionClass = "nonRestrictiveClause";
};
};
@ -463,6 +472,7 @@ rec {
passwdEntry = entryType: addCheck entryType (str: !(hasInfix ":" str || hasInfix "\n" str)) // {
name = "passwdEntry ${entryType.name}";
description = "${optionDescriptionPhrase (class: class == "noun") entryType}, not containing newlines or colons";
descriptionClass = "nonRestrictiveClause";
};
attrs = mkOptionType {
@ -870,7 +880,13 @@ rec {
# Either value of type `t1` or `t2`.
either = t1: t2: mkOptionType rec {
name = "either";
description = "${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") t1} or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction" || class == "composite") t2}";
description =
if t1.descriptionClass or null == "nonRestrictiveClause"
then
# Plain, but add comma
"${t1.description}, or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") t2}"
else
"${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: