cliparser: add skeleton code for command and command builder

Summary: Initial design / skeleton code for command::Command and command::CommandBuilder which is unimplemented

Reviewed By: quark-zju

Differential Revision: D15588927

fbshipit-source-id: 193d3d2aaae98a252e13d5b1e655cf93d7ce801e

lib/cliparser/src/command.rs

@@ -0,0 +1,85 @@
+// Copyright 2019 Facebook, Inc.
+//
+// This software may be used and distributed according to the terms of the
+// GNU General Public License version 2 or any later version.
+
+pub struct Command {
+    name: String,
+    aliases: Vec<String>,
+    subcommands: Vec<Command>, // TODO - some way to define the flags this supports
+}
+
+impl Command {
+    pub fn new() -> Self {
+        unimplemented!()
+    }
+
+    pub fn has_alias(&self, alias: &str) -> bool {
+        unimplemented!()
+    }
+
+    pub fn has_subcommand(&self, subcommand_name: &str) -> bool {
+        unimplemented!()
+    }
+
+    pub fn name(&self) -> &str {
+        unimplemented!()
+    }
+
+    pub fn builder() -> CommandBuilder {
+        unimplemented!()
+    }
+}
+
+pub struct CommandBuilder {
+    name: String,
+    aliases: Vec<String>,
+    subcommands: Vec<Command>,
+}
+
+// example api usage:
+// Command::builder()
+//     .with_name("cloud")
+//     .with_aliases(vec!["commitcloud", "cc"])
+//     .with_subcommand(
+//         Command::builder()
+//             .with_name("authenticate")
+//             .with_alias("login")
+//             .build()
+//     )
+//     .with_subcommand(
+//         Command::builder()
+//             .with_name("rejoin")
+//             .with_alias("rj")
+//             .build()
+//     )
+//     .build();
+impl CommandBuilder {
+    fn new() -> Self {
+        unimplemented!()
+    }
+
+    pub fn with_alias(&mut self, alias: &str) -> Self {
+        unimplemented!()
+    }
+
+    pub fn with_aliases(&mut self, aliases: Vec<&str>) -> Self {
+        unimplemented!()
+    }
+
+    pub fn with_subcommand(&mut self, subcommand: Command) -> Self {
+        unimplemented!()
+    }
+
+    pub fn with_subcommands(&mut self, subcommands: Vec<Command>) -> Self {
+        unimplemented!()
+    }
+
+    pub fn new_subcommand(&mut self, builder: CommandBuilder) -> Self {
+        unimplemented!()
+    }
+
+    pub fn build(self) -> Command {
+        unimplemented!()
+    }
+}