/**
* Prompt to confirm that the user wants to delete the JShellItem from the file system. If so,
* remove it. If -f is supplied, do not prompt and confirm. If the root directory is specified,
* its contents but not itself will be subject to deletion.
*
* @param paths the JShellItem to be removed.
*/
public void rm(List<String> paths) throws Exception {
// Loop through the user inputs.
for (String path : paths) {
// Initialize the current JShellItem.
JShellItem item = getItemAtPath(path, 0);
if (item == null) {
System.out.printf("%s: does not exist.\n", path);
} else {
// Keep track of the size of that JShellItem.
int size = item.getSize();
if (size > 0) {
List<String> recursiveList = recurseOnPath(path, true);
rm(recursiveList.subList(0, size + 1));
if (item.getSize() == 0) {
rm(recursiveList.subList(size + 1, size + 2));
}
} else {
if (item.getPath().equals("/")) {
return;
}
// Check the -f option.
if (!currentOptions_.equals("f")) {
System.out.printf(
"Really remove %s from %s? (y/n) ",
item.getName(), item.getParentDirectory().getPath());
// Read the user input.
ArrayList<String> in = readInput();
// If 'y'
if (in.toString().equals("[y]")) {
item.getParentDirectory().removeItem(item);
// if not 'n', ask again.
} else if (!in.toString().equals("[n]")) {
List<String> tempStore = new ArrayList<String>();
tempStore.add(path);
rm(tempStore);
}
// If -f is specified.
} else {
item.getParentDirectory().removeItem(item);
}
}
}
}
}
/**
* Gets the JShellItem located numFoldersUp numbers of folders up from the item located at path;
* path can be a full path or a path relative to the current directory; if there is no such item,
* returns null.
*
* <p>Call JShellItem(path, 0) to get the item located at path.
*
* @param path is a string that represents the full path to the JShellItem.
* @param numFoldersUp
* @return the JShellItem found at path or null if the item doesn't exist.
*/
public JShellItem getItemAtPath(String path, int numFoldersUp) throws Exception {
JShellItem item = currentDirectory_;
int startIndex = 0;
if (path.startsWith("/")) {
startIndex = 1;
item = rootDirectory_;
}
String[] directories = path.split("/");
while (startIndex < directories.length - numFoldersUp) {
if (directories[startIndex].equals("..")) {
item = item.getParentDirectory();
startIndex++;
} else if (((Directory) item).contains(directories[startIndex])) {
if (item instanceof File) {
throw new ClassCastException(item.getPath() + "is not a Directory");
}
item = ((Directory) item).getItem(directories[startIndex]);
startIndex++;
} else if (!directories[startIndex].equals(".")) {
return null;
} else {
startIndex++;
}
}
return item;
}
/**
* @param path
* @param includeFiles
* @return
* @throws Exception
*/
public List<String> recurseOnPath(String path, boolean includeFiles) throws Exception {
List<String> paths = new ArrayList<String>();
JShellItem item = getItemAtPath(path, 0);
if (!(item instanceof DirectoryAlias) && (includeFiles || item instanceof Directory)) {
paths.add(item.getPath());
}
if (item instanceof File) {
return paths;
} else {
for (JShellItem cont : ((Directory) item).getContents().values()) {
paths.addAll(0, recurseOnPath(cont.getPath(), includeFiles));
}
}
return paths;
}
/**
* Copy file or directory oldFile to newFile;
*
* @param oldFile a full path to a JShellItem or the name of a JShellItem in the current directory
* which needs to be copied.
* @param newFile a full path to a directory or the name of a directory in the current directory
* to which oldFile needs to be copied.
*/
public void cp(String oldPath, String newPath) throws Exception {
Directory destinationParent;
String newName;
if (oldPath.equals(newPath)) {
return;
}
JShellItem oldItem = getItemAtPath(oldPath, 0);
if (oldItem == null) {
throw new Exception(oldItem + " does not exist.");
}
if (newPath.endsWith("/")) {
destinationParent = (Directory) getItemAtPath(newPath, 0);
newName = oldItem.getName();
} else {
destinationParent = (Directory) getItemAtPath(newPath, 1);
newName = newPath.substring(newPath.lastIndexOf("/") + 1);
}
if (destinationParent == null) {
throw new Exception(newPath + " is an invalid destination path.");
}
if (destinationParent.contains(newName)) {
throw new Exception(destinationParent.getPath() + newName + " already exists.");
}
if (oldItem instanceof File) {
File newItem =
new File(
newName,
destinationParent.getPath() + "/" + newName,
destinationParent,
((File) oldItem).getContent());
destinationParent.addItem(newItem);
} else {
if (destinationParent.isChildOf((Directory) oldItem)) {
throw new Exception(
String.format("cp: cannot copy '%s' into itself, '%s'", oldPath, newPath));
}
Directory newItem =
new Directory(newName, destinationParent.getPath() + newName + "/", destinationParent);
destinationParent.addItem(newItem);
for (JShellItem item : ((Directory) oldItem).getContents().values()) {
cp(item.getPath(), newItem.getPath());
}
}
}
/**
* Prints the path of the files specified by the paths argument that contain a string that matches
* regex, followed by the particular line.
*
* @param regex is a String regular expression.
* @param paths is a List of paths.
*/
public String grep(String regex, List<String> paths) throws Exception {
if (regex.startsWith("\"")) {
int i = 0;
for (i = 0; i < paths.size() && !regex.endsWith("\""); i++) regex += " " + paths.get(i);
regex = regex.substring(1, regex.length() - 1);
paths = paths.subList(i, paths.size());
}
if (paths.isEmpty()) throw new Exception("Usage: grep [OPTION]... PATTERN [FILE]...");
String results = "";
for (String path : paths) {
JShellItem item = getItemAtPath(path, 0);
if (item.getSize() > 0 && currentOptions_.equals("R")) {
results += grep(regex, recurseOnPath(path, true).subList(0, item.getSize()));
} else if (item instanceof File) {
String content = ((File) item).getContent();
if (content.contains(regex)) {
if (!results.isEmpty()) results += "\n";
results += item.getPath() + ":\n";
for (String line : content.split("\\n")) {
if (line.contains(regex)) {
results += line + "\n";
}
}
results = results.substring(0, results.length() - 1);
}
} else if (item instanceof Directory && !currentOptions_.equals("R")) {
results += "Cannot call grep on a directory without -R.";
} else {
results += "";
}
}
return results;
}
