def fileCheck = { file, folder ->
    def folderNames = new groovy.json.JsonSlurper().parseText(file.text).collect { it.foldername }
    def folders = []
    folder.eachDir {
        folders << it.name
    }
    def disjunct = (folders + folderNames) - folders.intersect(folderNames)
    def missingFromFolders = folderNames.intersect(disjunct)
    def missingFromJson = folders.intersect(disjunct)

    if (!missingFromFolders.empty || !missingFromJson.empty) {
        StringBuilder missingString = new StringBuilder();
        missingString.append("Missing From Folders\n")
        for (String symbol : missingFromFolders) {
            missingString.append(symbol);
            missingString.append('\n');
        }
        missingString.append("\nMissing from JSON\n")
        for (String symbol : missingFromJson) {
            missingString.append(symbol);
            missingString.append('\n');
        }
        throw new GradleException("Found missing items\n" + missingString.toString());
    }
}

task checkTemplates(type: Task) {
    doLast {
        fileCheck(templateFile, templateDirectory)
    }
}

task checkExamples(type: Task) {
    doLast {
        fileCheck(exampleFile, exampleDirectory)
    }
}

task checkCommands(type: Task) {
    doLast {
        fileCheck(commandFile, commandDirectory)
    }
}

check.dependsOn checkTemplates
check.dependsOn checkExamples
check.dependsOn checkCommands