Add -0 shortcut for --null

Fixes BurntSushi#419

doc/rg.1.md

@@ -243,7 +243,7 @@ Project home page: https://github.com/BurntSushi/ripgrep
 : Don't respect version control ignore files (e.g., .gitignore).
   Note that .ignore files will continue to be respected.
 
---null
+-0, --null
 : Whenever a file name is printed, follow it with a NUL byte.
   This includes printing filenames before matches, and when printing
   a list of matching files such as with --count, --files-with-matches

src/app.rs

@@ -158,7 +158,7 @@ fn app<F>(next_line_help: bool, doc: F) -> App<'static, 'static>
         .arg(flag("no-ignore"))
         .arg(flag("no-ignore-parent"))
         .arg(flag("no-ignore-vcs"))
-        .arg(flag("null"))
+        .arg(flag("null").short("0"))
         .arg(flag("path-separator").value_name("SEPARATOR").takes_value(true))
         .arg(flag("pretty").short("p"))
         .arg(flag("replace").short("r").value_name("ARG").takes_value(true))

tests/tests.rs

@@ -1390,6 +1390,15 @@ clean!(feature_275_pathsep, "test", ".", |wd: WorkDir, mut cmd: Command| {
     assert_eq!(lines, "fooZbar:test\n");
 });
 
+// See: https://github.com/BurntSushi/ripgrep/issues/419
+sherlock!(feature_419_zero_as_shortcut_for_null, "Sherlock", ".",
+|wd: WorkDir, mut cmd: Command| {
+    cmd.arg("-0").arg("--count");
+
+    let lines: String = wd.stdout(&mut cmd);
+    assert_eq!(lines, "sherlock\x002\n");
+});
+
 #[test]
 fn binary_nosearch() {
     let wd = WorkDir::new("binary_nosearch");