feat(clap_app!): Support --("some-arg-name") syntax for defining lo…

…ng arg names

Used for arg names that aren't idents.

Ref #321

examples/18_builder_macro.rs

@@ -27,6 +27,7 @@ fn main() {
         (author: "Alice")
         (about: "Does awesome things")
         (@arg config: -c --config <conf> #{1, 2} {file_exists} "Sets a custom config file")
+        (@arg proxyHostname: --("proxy-hostname") +takes_value "Sets the hostname of the proxy to use")
         (@arg input: * "Input file")
         (@group test =>
             (@attributes +required)

src/macros.rs

@@ -478,6 +478,9 @@ macro_rules! clap_app {
 // No more tokens to munch
     (@arg ($arg:expr) $modes:tt) => { $arg };
 // Shorthand tokens influenced by the usage_string
+    (@arg ($arg:expr) $modes:tt --($long:expr) $($tail:tt)*) => {
+        clap_app!{ @arg ($arg.long($long)) $modes $($tail)* }
+    };
     (@arg ($arg:expr) $modes:tt --$long:ident $($tail:tt)*) => {
         clap_app!{ @arg ($arg.long(stringify!($long))) $modes $($tail)* }
     };

tests/macros.rs

@@ -73,3 +73,41 @@ fn quoted_app_name() {
     let help_text = String::from_utf8(help_text).expect("Help text is not valid utf-8");
     assert!(help_text.starts_with("app name with spaces-and-hyphens 0.1\n"));
 }
+
+#[test]
+fn quoted_arg_long_name() {
+    let app = clap_app!(claptests =>
+        (version: "0.1")
+        (about: "tests clap library")
+        (author: "Kevin K. <kbknapp@gmail.com>")
+        (@arg opt: -o --option +takes_value ... "tests options")
+        (@arg positional: index(1) "tests positionals")
+        (@arg flag: -f --flag ... +global "tests flags")
+        (@arg flag2: -F conflicts_with[flag] requires[option2]
+            "tests flags with exclusions")
+        (@arg option2: --("long-option-2") conflicts_with[option] requires[positional2]
+            "tests long options with exclusions")
+        (@arg positional2: index(2) "tests positionals with exclusions")
+        (@arg option3: -O --Option +takes_value possible_value[fast slow]
+            "tests options with specific value sets")
+        (@arg positional3: index(3) ... possible_value[vi emacs]
+            "tests positionals with specific values")
+        (@arg multvals: --multvals +takes_value value_name[one two]
+            "Tests mutliple values, not mult occs")
+        (@arg multvalsmo: --multvalsmo ... +takes_value value_name[one two]
+            "Tests mutliple values, not mult occs")
+        (@arg minvals: --minvals2 min_values(1) ... +takes_value "Tests 2 min vals")
+        (@arg maxvals: --maxvals3 ... +takes_value max_values(3) "Tests 3 max vals")
+        (@subcommand subcmd =>
+            (about: "tests subcommands")
+            (version: "0.1")
+            (author: "Kevin K. <kbknapp@gmail.com>")
+            (@arg scoption: -o --option ... +takes_value "tests options")
+            (@arg scpositional: index(1) "tests positionals"))
+    );
+
+    assert_eq!(app.p.long_list[2], "long-option-2");
+
+    let matches = app.get_matches_from_safe(vec!["bin_name", "value1", "value2", "--long-option-2"]).expect("Expected to successfully match the given args.");
+    assert!(matches.is_present("option2"));
+}