From ddf47fab313d3c37cbbe213e4c2b6fc22c20291f Mon Sep 17 00:00:00 2001
From: Knight <anonymousknight96@gmail.com>
Date: Sat, 20 Aug 2016 04:13:15 +0800
Subject: [PATCH] groups: use uucore::entries::get_groups instead

---
 src/groups/Cargo.toml |  8 +++---
 src/groups/groups.rs  | 59 +++++++++++++++----------------------------
 2 files changed, 25 insertions(+), 42 deletions(-)

diff --git a/src/groups/Cargo.toml b/src/groups/Cargo.toml
index c468e8a08..c5132f620 100644
--- a/src/groups/Cargo.toml
+++ b/src/groups/Cargo.toml
@@ -7,10 +7,10 @@ authors = []
 name = "uu_groups"
 path = "groups.rs"
 
-[dependencies]
-getopts = "*"
-libc = "*"
-uucore = { path="../uucore" }
+[dependencies.uucore]
+path = "../uucore"
+default-features = false
+features = ["entries"]
 
 [[bin]]
 name = "groups"
diff --git a/src/groups/groups.rs b/src/groups/groups.rs
index 2ba06c1b4..f279eb1d3 100644
--- a/src/groups/groups.rs
+++ b/src/groups/groups.rs
@@ -1,52 +1,35 @@
 #![crate_name = "uu_groups"]
 
-/*
- * This file is part of the uutils coreutils package.
- *
- * (c) Alan Andrade <alan.andradec@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- *
- */
-
-extern crate getopts;
+// This file is part of the uutils coreutils package.
+//
+// (c) Alan Andrade <alan.andradec@gmail.com>
+// (c) Jian Zeng <anonymousknight96 AT gmail.com>
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+//
+//
 
 #[macro_use]
 extern crate uucore;
-
+use uucore::entries::{Passwd, Locate, get_groups, gid2grp};
 use std::io::Write;
-use uucore::c_types::{get_pw_from_args, group};
 
-static NAME: &'static str = "groups";
-static VERSION: &'static str = env!("CARGO_PKG_VERSION");
+static SYNTAX: &'static str = "[user]";
+static SUMMARY: &'static str = "display current group names";
 
 pub fn uumain(args: Vec<String>) -> i32 {
-    let mut opts = getopts::Options::new();
-    opts.optflag("h", "help", "display this help menu and exit");
-    opts.optflag("V", "version", "display version information and exit");
+    let mut opts = new_coreopts!(SYNTAX, SUMMARY, "");
+    let matches = opts.parse(args);
 
-    let matches = match opts.parse(&args[1..]) {
-        Ok(m) => { m },
-        Err(f) => {
-            show_error!("{}", f);
-            return 1;
-        }
-    };
-
-    if matches.opt_present("version") {
-        println!("{} {}", NAME, VERSION);
-    } else if matches.opt_present("help") {
-        let msg = format!("{0} {1}
-
-Usage:
-  {0} [OPTION]... [USER]...
-
-Prints the groups a user is in to standard output.", NAME, VERSION);
-
-        print!("{}", opts.usage(&msg));
+    if matches.free.is_empty() {
+        println!("{}", get_groups().unwrap().iter().map(|&g| gid2grp(g).unwrap()).collect::<Vec<_>>().join(" "));
     } else {
-        group(get_pw_from_args(&matches.free), true);
+        if let Ok(p) = Passwd::locate(matches.free[0].as_str()) {
+            println!("{}", p.belongs_to().iter().map(|&g| gid2grp(g).unwrap()).collect::<Vec<_>>().join(" "));
+        } else {
+            crash!(1, "unknown user {}", matches.free[0]);
+        }
     }
 
     0