Add simple rm implementation

Makefile

@@ -15,6 +15,7 @@ EXES        := \
   false \
   printenv \
   pwd \
+  rm \
   true \
   wc \
   whoami \

rm/rm.rs

@@ -0,0 +1,147 @@
+#[link(name="rm", vers="1.0.0", author="Arcterus")];
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Arcterus <arcterus@mail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+extern mod extra;
+
+use std::os;
+use std::io::{stderr,fs,io_error};
+use extra::getopts::groups;
+
+enum InteractiveMode {
+    InteractiveNone,
+    InteractiveOnce,
+    InteractiveAlways
+}
+
+fn main() {
+    let args = os::args();
+    let program = args[0].clone();
+
+    // TODO: make getopts support -R in addition to -r
+    let opts = ~[
+        groups::optflag("f", "force", "ignore nonexistent files and arguments, never prompt"),
+        groups::optflag("i", "", "prompt before every removal"),
+        groups::optflag("I", "", "prompt once before removing more than three files, or when removing recursively.  Less intrusive than -i, while still giving some protection against most mistakes"),
+        groups::optflagopt("", "interactive", "prompt according to WHEN: never, once (-I), or always (-i).  Without WHEN, prompts always", "WHEN"),
+        groups::optflag("", "one-file-system", "when removing a hierarchy recursively, skip any directory that is on a file system different from that of the corresponding command line argument"),
+        groups::optflag("", "no-preserve-root", "do not treat '/' specially"),
+        groups::optflag("", "preserve-root", "do not remove '/' (default)"),
+        groups::optflag("r", "recursive", "remove directories and their contents recursively"),
+        groups::optflag("d", "dir", "remove empty directories"),
+        groups::optflag("v", "verbose", "explain what is being done"),
+        groups::optflag("", "help", "display this help and exit"),
+        groups::optflag("", "version", "output version information and exit")
+    ];
+    let matches = match groups::getopts(args.tail(), opts) {
+        Ok(m) => m,
+        Err(f) => {
+            writeln!(&mut stderr() as &mut Writer,
+                     "{}", f.to_err_msg());
+            os::set_exit_status(1);
+            return
+        }
+    };
+    if matches.opt_present("help") {
+        println("rm 1.0.0");
+        println("");
+        println("Usage:");
+        println!("  {0:s} [OPTION]... [FILE]...", program);
+        println("");
+        print(groups::usage("Remove (unlink) the FILE(s).", opts));
+        println("");
+        println("By default, rm does not remove directories.  Use the --recursive (-r)");
+        println("option to remove each listed directory, too, along with all of its contents");
+        println("");
+        println("To remove a file whose name starts with a '-', for example '-foo',");
+        println("use one of these commands:");
+        println("rm -- -foo");
+        println("");
+        println("rm ./-foo");
+        println("");
+        println("Note that if you use rm to remove a file, it might be possible to recover");
+        println("some of its contents, given sufficient expertise and/or time.  For greater");
+        println("assurance that the contents are truly unrecoverable, consider using shred.");
+    } else if matches.opt_present("version") {
+        println("rm 1.0.0");
+    } else {
+        let force = matches.opt_present("force");
+        let interactive =
+            if matches.opt_present("i") {
+                InteractiveAlways
+            } else if matches.opt_present("I") {
+                InteractiveOnce
+            } else if matches.opt_present("interactive") {
+                match matches.opt_str("interactive").unwrap() {
+                    ~"none" => InteractiveNone,
+                    ~"once" => InteractiveOnce,
+                    ~"always" => InteractiveAlways,
+                    val => {
+                        writeln!(&mut stderr() as &mut Writer,
+                                 "Invalid argument to interactive ({})", val);
+                        os::set_exit_status(1);
+                        return
+                    }
+                }
+            } else {
+                InteractiveNone
+            };
+        let one_fs = matches.opt_present("one-file-system");
+        let preserve_root = !matches.opt_present("no-preserve-root");
+        let recursive = matches.opt_present("recursive");
+        let dir = matches.opt_present("dir");
+        let verbose = matches.opt_present("verbose");
+        remove_files(matches.free, force, interactive, one_fs, preserve_root,
+                     recursive, dir, verbose);
+    }
+}
+
+fn remove_files(files: &[~str], force: bool, interactive: InteractiveMode, one_fs: bool, preserve_root: bool, recursive: bool, dir: bool, verbose: bool) {
+    for filename in files.iter() {
+        let file = Path::new(filename.to_owned());
+        if file.exists() {
+            if file.is_dir() {
+                if recursive && (*filename != ~"/" || !preserve_root) {
+                    remove_files(fs::walk_dir(&file).map(|x| x.as_str().unwrap().to_owned()).to_owned_vec(), force, interactive, one_fs, preserve_root, recursive, dir, verbose);
+                    io_error::cond.trap(|_| {
+                        writeln!(&mut stderr() as &mut Writer,
+                                 "Could not remove directory: '{}'", *filename);
+                    }).inside(|| {
+                        fs::rmdir(&file);
+                    });
+                } else if dir {
+                    io_error::cond.trap(|_| {
+                        writeln!(&mut stderr() as &mut Writer,
+                                 "Could not remove directory '{}'", *filename);
+                    }).inside(|| {
+                        fs::rmdir(&file);
+                    });
+                } else {
+                    writeln!(&mut stderr() as &mut Writer,
+                             "Could not remove directory '{}' (did you mean to pass '-r'?)",
+                             *filename);
+                }
+            } else {
+                io_error::cond.trap(|_| {
+                    writeln!(&mut stderr() as &mut Writer,
+                             "Could not remove file: '{}'", *filename);
+                    os::set_exit_status(1);
+                }).inside(|| {
+                    fs::unlink(&file);
+                });
+            }
+        } else if !force {
+            writeln!(&mut stderr() as &mut Writer,
+                     "Invalid file: '{}'", *filename);
+            os::set_exit_status(1);
+        }
+    }
+}
+