Add schema provided checks for library.properties category field

Author: per1234

Diff for: check/checkconfigurations/checkconfigurations.go

@@ -506,6 +506,51 @@ var configurations = []Type{
 		ErrorModes:      nil,
 		CheckFunction:   checkfunctions.LibraryPropertiesParagraphFieldRepeatsSentence,
 	},
+	{
+		ProjectType:     projecttype.Library,
+		Category:        "library.properties",
+		Subcategory:     "category field",
+		ID:              "",
+		Brief:           "missing category field",
+		Description:     `This can cause a warning and results in the default "Uncategorized" category being used.`,
+		MessageTemplate: "missing category field in library.properties. See https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format",
+		DisableModes:    nil,
+		EnableModes:     []checkmode.Type{checkmode.All},
+		InfoModes:       nil,
+		WarningModes:    []checkmode.Type{checkmode.All},
+		ErrorModes:      nil,
+		CheckFunction:   checkfunctions.LibraryPropertiesCategoryFieldMissing,
+	},
+	{
+		ProjectType:     projecttype.Library,
+		Category:        "library.properties",
+		Subcategory:     "category field",
+		ID:              "",
+		Brief:           "invalid category value",
+		Description:     `This can cause a warning and results in the default "Uncategorized" category being used.`,
+		MessageTemplate: "invalid category field value {{.}} in library.properties. See https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format",
+		DisableModes:    nil,
+		EnableModes:     []checkmode.Type{checkmode.All},
+		InfoModes:       nil,
+		WarningModes:    []checkmode.Type{checkmode.Permissive},
+		ErrorModes:      []checkmode.Type{checkmode.Default},
+		CheckFunction:   checkfunctions.LibraryPropertiesCategoryFieldInvalid,
+	},
+	{
+		ProjectType:     projecttype.Library,
+		Category:        "library.properties",
+		Subcategory:     "category field",
+		ID:              "",
+		Brief:           `"Uncategorized" category value`,
+		Description:     "There is no good reason for using this non-specification compliant category value.",
+		MessageTemplate: `Use of "Uncategorized" category value in library.properties. Please use one of the supported categories listed at https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format`,
+		DisableModes:    nil,
+		EnableModes:     []checkmode.Type{checkmode.All},
+		InfoModes:       nil,
+		WarningModes:    []checkmode.Type{checkmode.All},
+		ErrorModes:      nil,
+		CheckFunction:   checkfunctions.LibraryPropertiesCategoryFieldUncategorized,
+	},
 	{
 		ProjectType:     projecttype.Library,
 		Category:        "library.properties",

Diff for: check/checkfunctions/library.go

@@ -490,6 +490,54 @@ func LibraryPropertiesParagraphFieldRepeatsSentence() (result checkresult.Type,
 	return checkresult.Pass, ""
 }
 
+// LibraryPropertiesCategoryFieldMissing checks for missing library.properties "category" field.
+func LibraryPropertiesCategoryFieldMissing() (result checkresult.Type, output string) {
+	if checkdata.LibraryPropertiesLoadError() != nil {
+		return checkresult.NotRun, ""
+	}
+
+	if schema.RequiredPropertyMissing("category", checkdata.LibraryPropertiesSchemaValidationResult()[compliancelevel.Specification], configuration.SchemasPath()) {
+		return checkresult.Fail, ""
+	}
+	return checkresult.Pass, ""
+}
+
+// LibraryPropertiesCategoryFieldInvalid checks for invalid category in the library.properties "category" field.
+func LibraryPropertiesCategoryFieldInvalid() (result checkresult.Type, output string) {
+	if checkdata.LibraryPropertiesLoadError() != nil {
+		return checkresult.NotRun, ""
+	}
+
+	category, ok := checkdata.LibraryProperties().GetOk("category")
+	if !ok {
+		return checkresult.NotRun, ""
+	}
+
+	if schema.PropertyEnumMismatch("category", checkdata.LibraryPropertiesSchemaValidationResult()[compliancelevel.Specification], configuration.SchemasPath()) {
+		return checkresult.Fail, category
+	}
+
+	return checkresult.Pass, ""
+}
+
+// LibraryPropertiesCategoryFieldUncategorized checks whether the library.properties "category" value is "Uncategorized".
+func LibraryPropertiesCategoryFieldUncategorized() (result checkresult.Type, output string) {
+	if checkdata.LibraryPropertiesLoadError() != nil {
+		return checkresult.NotRun, ""
+	}
+
+	category, ok := checkdata.LibraryProperties().GetOk("category")
+	if !ok {
+		return checkresult.NotRun, ""
+	}
+
+	if category == "Uncategorized" {
+		return checkresult.Fail, ""
+	}
+
+	return checkresult.Pass, ""
+}
+
 // LibraryPropertiesDependsFieldNotInIndex checks whether the libraries listed in the library.properties `depends` field are in the Library Manager index.
 func LibraryPropertiesDependsFieldNotInIndex() (result checkresult.Type, output string) {
 	if checkdata.LibraryPropertiesLoadError() != nil {