Add --level option to limit tree and recursion

src/main.rs

 #![feature(collections, core, env, libc, old_io, old_path, plugin, std_misc)]
-// Other platforms then macos don’t need std_misc but you can’t 
+
+// Other platforms than macos don't need std_misc but you can't
 // use #[cfg] on features.
-#![allow(unused_features)] 
+#![allow(unused_features)]
 
 extern crate ansi_term;
 extern crate datetime;
@@ -17,10 +18,11 @@ extern crate git2;
 
 use std::env;
 use std::old_io::{fs, FileType};
+use std::path::Component::CurDir;
 
 use dir::Dir;
 use file::File;
-use options::{Options, View, DirAction};
+use options::{Options, View};
 use output::lines_view;
 
 pub mod column;
@@ -58,7 +60,7 @@ impl<'a> Exa<'a> {
             match fs::stat(&path) {
                 Ok(stat) => {
                     if stat.kind == FileType::Directory {
-                        if self.options.dir_action == DirAction::Tree {
+                        if self.options.dir_action.is_tree() {
                             self.files.push(File::with_stat(stat, &path, None, true));
                         }
                         else {
@@ -111,9 +113,11 @@ impl<'a> Exa<'a> {
                     // backwards: the *last* element of the stack is used each
                     // time, so by inserting them backwards, they get displayed in
                     // the correct sort order.
-                    if self.options.dir_action == DirAction::Recurse {
-                        for dir in files.iter().filter(|f| f.stat.kind == FileType::Directory).rev() {
-                            self.dirs.push(dir.path.clone());
+                    if let Some(recurse_opts) = self.options.dir_action.recurse_options() {
+                        if !recurse_opts.tree && !recurse_opts.is_too_deep(dir_path.components().count() + 1) {
+                            for dir in files.iter().filter(|f| f.stat.kind == FileType::Directory).rev() {
+                                self.dirs.push(dir.path.clone());
+                            }
                         }
                     }
 

src/options.rs

@@ -8,6 +8,7 @@ use xattr;
 
 use std::cmp::Ordering;
 use std::fmt;
+use std::num::ParseIntError;
 
 use getopts;
 use natord;
@@ -44,11 +45,6 @@ impl Options {
     /// Call getopts on the given slice of command-line strings.
     pub fn getopts(args: &[String]) -> Result<(Options, Vec<String>), Misfire> {
         let mut opts = getopts::Options::new();
-        if xattr::feature_implemented() {
-            opts.optflag("@", "extended",
-                         "display extended attribute keys and sizes in long (-l) output"
-            );
-        }
         opts.optflag("1", "oneline",   "display one entry per line");
         opts.optflag("a", "all",       "show dot-files");
         opts.optflag("b", "binary",    "use binary prefixes in file sizes");
@@ -59,6 +55,7 @@ impl Options {
         opts.optflag("H", "links",     "show number of hard links");
         opts.optflag("i", "inode",     "show each file's inode number");
         opts.optflag("l", "long",      "display extended details and attributes");
+        opts.optopt ("L", "level",     "maximum depth of recursion", "DEPTH");
         opts.optflag("m", "modified",  "display timestamp of most recent modification");
         opts.optflag("r", "reverse",   "reverse order of files");
         opts.optflag("R", "recurse",   "recurse into directories");
@@ -71,6 +68,10 @@ impl Options {
         opts.optflag("x", "across",    "sort multi-column view entries across");
         opts.optflag("?", "help",      "show list of command-line options");
 
+        if xattr::feature_implemented() {
+            opts.optflag("@", "extended", "display extended attribute keys and sizes in long (-l) output");
+        }
+
         let matches = match opts.parse(args) {
             Ok(m) => m,
             Err(e) => return Err(Misfire::InvalidOptions(e)),
@@ -98,9 +99,12 @@ impl Options {
             matches.free.clone()
         };
 
+        let dir_action = try!(DirAction::deduce(&matches));
+        let view = try!(View::deduce(&matches, filter, dir_action));
+
         Ok((Options {
-            dir_action: try!(DirAction::deduce(&matches)),
-            view:       try!(View::deduce(&matches, filter)),
+            dir_action: dir_action,
+            view:       view,
             filter:     filter,
         }, path_strs))
     }
@@ -179,12 +183,15 @@ pub enum Misfire {
     /// this enum isn't named Error!
     Help(String),
 
-    /// Two options were given that conflict with one another
+    /// Two options were given that conflict with one another.
     Conflict(&'static str, &'static str),
 
     /// An option was given that does nothing when another one either is or
     /// isn't present.
     Useless(&'static str, bool, &'static str),
+
+    /// A numeric option was given that failed to be parsed as a number.
+    FailedParse(ParseIntError),
 }
 
 impl Misfire {
@@ -203,12 +210,13 @@ impl fmt::Display for Misfire {
             Conflict(a, b)        => write!(f, "Option --{} conflicts with option {}.", a, b),
             Useless(a, false, b)  => write!(f, "Option --{} is useless without option --{}.", a, b),
             Useless(a, true, b)   => write!(f, "Option --{} is useless given option --{}.", a, b),
+            FailedParse(ref e)    => write!(f, "Failed to parse number: {}", e),
         }
     }
 }
 
 impl View {
-    pub fn deduce(matches: &getopts::Matches, filter: FileFilter) -> Result<View, Misfire> {
+    pub fn deduce(matches: &getopts::Matches, filter: FileFilter, dir_action: DirAction) -> Result<View, Misfire> {
         if matches.opt_present("long") {
             if matches.opt_present("across") {
                 Err(Misfire::Useless("across", true, "long"))
@@ -220,7 +228,7 @@ impl View {
                 let details = Details {
                         columns: try!(Columns::deduce(matches)),
                         header: matches.opt_present("header"),
-                        tree: matches.opt_present("recurse") || matches.opt_present("tree"),
+                        recurse: dir_action.recurse_options(),
                         xattr: xattr::feature_implemented() && matches.opt_present("extended"),
                         filter: filter,
                 };
@@ -373,7 +381,9 @@ impl TimeTypes {
 /// What to do when encountering a directory?
 #[derive(PartialEq, Debug, Copy)]
 pub enum DirAction {
-    AsFile, List, Recurse, Tree
+    AsFile,
+    List,
+    Recurse(RecurseOptions),
 }
 
 impl DirAction {
@@ -385,12 +395,68 @@ impl DirAction {
         match (recurse, list, tree) {
             (true,  true,  _    ) => Err(Misfire::Conflict("recurse", "list-dirs")),
             (_,     true,  true ) => Err(Misfire::Conflict("tree", "list-dirs")),
-            (true,  false, false) => Ok(DirAction::Recurse),
-            (_   ,  _,     true ) => Ok(DirAction::Tree),
+            (true,  false, false) => Ok(DirAction::Recurse(try!(RecurseOptions::deduce(matches, false)))),
+            (_   ,  _,     true ) => Ok(DirAction::Recurse(try!(RecurseOptions::deduce(matches, true)))),
             (false, true,  _    ) => Ok(DirAction::AsFile),
             (false, false, _    ) => Ok(DirAction::List),
         }
     }
+
+    pub fn recurse_options(&self) -> Option<RecurseOptions> {
+        match *self {
+            DirAction::Recurse(opts) => Some(opts),
+            _ => None,
+        }
+    }
+
+    pub fn is_tree(&self) -> bool {
+        match *self {
+            DirAction::Recurse(RecurseOptions { max_depth: _, tree }) => tree,
+            _ => false,
+         }
+    }
+
+    pub fn is_recurse(&self) -> bool {
+        match *self {
+            DirAction::Recurse(RecurseOptions { max_depth: _, tree }) => !tree,
+            _ => false,
+         }
+    }
+}
+
+#[derive(PartialEq, Debug, Copy)]
+pub struct RecurseOptions {
+    pub tree:      bool,
+    pub max_depth: Option<usize>,
+}
+
+impl RecurseOptions {
+    pub fn deduce(matches: &getopts::Matches, tree: bool) -> Result<RecurseOptions, Misfire> {
+        let max_depth = if let Some(level) = matches.opt_str("level") {
+            match level.parse() {
+                Ok(l)  => Some(l),
+                Err(e) => return Err(Misfire::FailedParse(e)),
+            }
+        }
+        else {
+            None
+        };
+
+        Ok(RecurseOptions {
+            tree: tree,
+            max_depth: max_depth,
+        })
+    }
+
+    pub fn is_too_deep(&self, depth: usize) -> bool {
+        match self.max_depth {
+            None    => false,
+            Some(d) => {
+                println!("Comparing {} to {}", d, depth);
+                d <= depth
+            }
+        }
+    }
 }
 
 #[derive(PartialEq, Copy, Debug)]

src/output/details.rs

@@ -2,7 +2,7 @@ use column::{Alignment, Column, Cell};
 use xattr::Attribute;
 use dir::Dir;
 use file::{File, GREY};
-use options::{Columns, FileFilter};
+use options::{Columns, FileFilter, RecurseOptions};
 use users::OSUsers;
 
 use locale;
@@ -12,7 +12,7 @@ use ansi_term::Style::Plain;
 pub struct Details {
     pub columns: Columns,
     pub header: bool,
-    pub tree: bool,
+    pub recurse: Option<RecurseOptions>,
     pub xattr: bool,
     pub filter: FileFilter,
 }
@@ -57,7 +57,7 @@ impl Details {
                 print!("{} ", column.alignment().pad_string(&row.cells[num].text, padding));
             }
 
-            if self.tree {
+            if self.recurse.is_some() {
                 stack.resize(row.depth  + 1, "├──");
                 stack[row.depth] = if row.last { "└──" } else { "├──" };
 
@@ -75,7 +75,7 @@ impl Details {
             }
 
             print!("{}\n", row.name);
-            
+
             if self.xattr {
                 let width = row.attrs.iter().map(|a| a.name().len()).max().unwrap_or(0);
                 for attr in row.attrs.iter() {
@@ -103,7 +103,11 @@ impl Details {
 
             dest.push(row);
 
-            if self.tree {
+            if let Some(r) = self.recurse {
+                if r.tree == false || r.is_too_deep(depth) {
+                    continue;
+                }
+
                 if let Some(ref dir) = file.this {
                     let mut files = dir.files(true);
                     self.filter.transform_files(&mut files);