Groovy: File manipulation, search and deletion
Published on 18 July 2019
Here, I will focus on loading a property in a project build.https://docs.gradle.org/current/userguide/userguide.html[gradle]+ without it being available in the code. + The property will be defined in the gradle.properties file of the ~/.gradle/gradle.properties folder + ~ is a shortcut for the HOME_PATH symbolic variable representing the user session root: thehttps://fr.wikipedia.org/wiki/R%C3%A9pertoire_personnel[personal directory]. Similarly, in a project buildhttps://maven.apache.org/guides/index.html[maven], with ~/.m2/settings.xml. The purpose of this script is to delete the files that match the patterns specified in the strCriteria variable. To do this, I will use thehttps://fr.wikipedia.org/wiki/Fermeture_(informatique)[closures]: each, findAll, collect, as well as the StringTokenizer class, which will break my criteria string into pieces to retrieve a list of strings. If one of the files in my folder to be cleaned contains one of the patterns in its name, it will be a candidate for deletion by being added to the result list. And in the last line, a small example ofhttps://en.wikipedia.org/wiki/Elvis_operator[Elvis operator]+ filemanip.groovy
#!/usr/bin/env groovy
//Mes criteres de selection des fichiers à detruire
String strCriteria = "Dummies Dummie ajax Objective-C Windows blackberry " +
"wordpress joomla ios c# f# rails ruby flex asp flash Dreamweaver adobe " +
"CoffeeScript c++ .chm .epub .rar .zip .tar drupal drupals .net php javascript " +
".js iphone ipad js _js facebook gwt vaadin linq python py zope window " +
"3D scala gaming active_directory tomcat jboss glassfish microsoft 2d " +
"lego blogger blog cocoa dojo dom dotnetnuke eclipse .gz unity sharepoint " +
".tgz iwork filemaker .doc .txt"
//repertoire personnel
String userDir = System.getProperty("user.home")
//un separateur de chemin crossplatform
String sep = System.getProperty("file.separator")
//la variable symbolique
String sym_books_vrac_path = "books_vrac_path"
//le chemin de mon fichier gradle.properties hors projet
String propertiesFilePath = userDir
.concat("${sep}.gradle${sep}gradle.properties")
File propertiesFile = new File(propertiesFilePath)
//je m'aassure que le fichier existe et que ce n'est pas un dossier
assert propertiesFile.exists() && !propertiesFile.directory
Properties gradleProperties = new Properties()
//on boucle avec un inpustream sur le fichier
//gradle.properties pour peupler ma variable gradleProperties
propertiesFile.withInputStream { InputStream it ->
gradleProperties.load(it)
}
//le chemin du dossier books_vrac est la valeur de notre clé books_vrac_path
String pathVracDir = gradleProperties.get(sym_books_vrac_path)
//j'ai récuperé tous ces livres en tapant cette commande dans le terminal
//wget -m -np -c -R "index.html*" "http://the-eye.eu/public/Books/IT%20Various/"
//on ouvre le dossier dont le chemin est dans la variable pathVracDir
// on s'assure qu'il existe et que c'est un dossier
File vracDir = new File(pathVracDir)
assert vracDir.exists() && vracDir.directory
//separer les élèments de ma liste de critère
StringTokenizer tokenizer = new StringTokenizer(strCriteria)
//la liste de critere
List<String> criteriaList = new ArrayList<>()
//j'itère sur les tokens et je construit ma liste de token,
// mot clef critère de recherche
tokenizer.each { String it ->
criteriaList.add(it.toLowerCase())
}
//je collect tous les noms de fichier dans le dossier
List<String> fileNameList = vracDir
.listFiles()
.collect { File it ->
it.directory ?: it.name
}
// je collect les noms de fichier qui contiendraient un des criteres
List<String> resultList = fileNameList.findAll { String name ->
criteriaList.findAll { String crit ->
name.toLowerCase().contains(crit)
}
}
// je parcours ma liste de résultat pour les effacer
resultList.each { String fileName ->
assert new File(vracDir.path + sep + fileName).delete()
}
println fileNameList.size()
println resultList.size()
resultList.empty ?: println(vracDir.path + sep + resultList.first())