From 9011ccbd585d06ba9eaea94b8cac8780f749d5d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kornel=20Lesin=CC=81ski?= <kornel@geekhood.net>
Date: Mon, 9 Jul 2018 17:26:27 +0100
Subject: [PATCH] CLI args value names

---
 src/main.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/main.rs b/src/main.rs
index 6e0334d8..e18c5137 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,6 +37,7 @@ fn main() {
             .short("o")
             .long("opt")
             .takes_value(true)
+            .value_name("level")
             .possible_value("0")
             .possible_value("1")
             .possible_value("2")
@@ -60,12 +61,14 @@ fn main() {
             .help("Write output file(s) to <directory>")
             .long("dir")
             .takes_value(true)
+            .value_name("directory")
             .conflicts_with("output_file")
             .conflicts_with("stdout"))
         .arg(Arg::with_name("output_file")
             .help("Write output file to <file>")
             .long("out")
             .takes_value(true)
+            .value_name("file")
             .conflicts_with("output_dir")
             .conflicts_with("stdout"))
         .arg(Arg::with_name("stdout")
@@ -113,12 +116,14 @@ fn main() {
             .short("i")
             .long("interlace")
             .takes_value(true)
+            .value_name("0/1")
             .possible_value("0")
             .possible_value("1"))
         .arg(Arg::with_name("compression")
             .help("zlib compression levels (1-9) - Default: 9")
             .long("zc")
             .takes_value(true)
+            .value_name("levels")
             .validator(|x| {
                 match parse_numeric_range_opts(&x, 1, 9) {
                     Ok(_) => Ok(()),
@@ -139,6 +144,7 @@ fn main() {
             .help("zlib window size - Default: 32k")
             .long("zw")
             .takes_value(true)
+            .value_name("size")
             .possible_value("256")
             .possible_value("512")
             .possible_value("1k")
@@ -170,6 +176,7 @@ fn main() {
             .help("Strip metadata objects ['safe', 'all', or comma-separated list]")
             .long("strip")
             .takes_value(true)
+            .value_name("mode")
             .conflicts_with("strip-safe"))
         .arg(Arg::with_name("strip-safe")
             .help("Strip safely-removable metadata objects")
@@ -184,6 +191,7 @@ fn main() {
             .long("threads")
             .short("t")
             .takes_value(true)
+            .value_name("num")
             .validator(|x| {
                 match x.parse::<usize>() {
                     Ok(val) => {