refactor(sync): Move to clap + add tests

Cargo.lock

@@ -2096,7 +2096,7 @@ dependencies = [
 name = "uu_sync"
 version = "0.0.1"
 dependencies = [
- "getopts 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "uucore 0.0.4 (git+https://github.com/uutils/uucore.git?branch=canary)",
  "uucore_procs 0.0.4 (git+https://github.com/uutils/uucore.git?branch=canary)",

src/uu/sync/Cargo.toml

@@ -15,7 +15,7 @@ edition = "2018"
 path = "src/sync.rs"
 
 [dependencies]
-getopts = "0.2.18"
+clap = "2.33"
 libc = "0.2.42"
 uucore = { version="0.0.4", package="uucore", git="https://github.com/uutils/uucore.git", branch="canary", features=["wide"] }
 uucore_procs = { version="0.0.4", package="uucore_procs", git="https://github.com/uutils/uucore.git", branch="canary" }

src/uu/sync/src/sync.rs

@@ -7,17 +7,14 @@
 
 /* Last synced with: sync (GNU coreutils) 8.13 */
 
-extern crate getopts;
+extern crate clap;
 extern crate libc;
 
-#[cfg(windows)]
 #[macro_use]
 extern crate uucore;
 
-#[cfg(not(windows))]
+use clap::App;
-extern crate uucore;
+static ABOUT: &str = "Synchronize cached writes to persistent storage";
-
-static NAME: &str = "sync";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
 #[cfg(unix)]
@@ -118,57 +115,23 @@ mod platform {
     }
 }
 
+fn get_usage() -> String {
+    format!("{0} [OPTION]... FILE...", executable!())
+}
+
 pub fn uumain(args: impl uucore::Args) -> i32 {
-    let args = args.collect_str();
+    let usage = get_usage();
 
-    let mut opts = getopts::Options::new();
+    let _matches = App::new(executable!())
-
+        .version(VERSION)
-    opts.optflag("h", "help", "display this help and exit");
+        .about(ABOUT)
-    opts.optflag("V", "version", "output version information and exit");
+        .usage(&usage[..])
-
+        .get_matches_from(args);
-    let matches = match opts.parse(&args[1..]) {
-        Ok(m) => m,
-        _ => {
-            help(&opts);
-            return 1;
-        }
-    };
-
-    if matches.opt_present("h") {
-        help(&opts);
-        return 0;
-    }
-
-    if matches.opt_present("V") {
-        version();
-        return 0;
-    }
 
     sync();
     0
 }
 
-fn version() {
-    println!("{} (uutils) {}", NAME, VERSION);
-    println!("The MIT License");
-    println!();
-    println!("Author -- Alexander Fomin.");
-}
-
-fn help(opts: &getopts::Options) {
-    let msg = format!(
-        "{0} {1}
-
-Usage:
-  {0} [OPTION]
-
-Force changed blocks to disk, update the super block.",
-        NAME, VERSION
-    );
-
-    print!("{}", opts.usage(&msg));
-}
-
 fn sync() -> isize {
     unsafe { platform::do_sync() }
 }

tests/by-util/test_sync.rs

@@ -1 +1,11 @@
-// ToDO: add tests
+use crate::common::util::*;
+
+#[test]
+fn test_sync_default() {
+    new_ucmd!().run();
+}
+
+#[test]
+fn test_sync_incorrect_arg() {
+    new_ucmd!().arg("--foo").fails();
+}