feat: add use clap

.gitignore

@@ -1,6 +1,6 @@
 # Generated by Cargo
 # will have compiled files and executables
-/target/
+target/
 
 Cargo.lock
 # These are backup files generated by rustfmt

demo/test_clap/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "test_clap"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rust_util = { version = "0.6", path = "../../", features = ["use_clap"] }
+clap = "2.0"

demo/test_clap/src/main.rs

@@ -0,0 +1,24 @@
+use clap::{App, SubCommand, ArgMatches};
+use rust_util::util_clap::Command;
+use rust_util::util_clap::CommandError;
+use rust_util::util_clap::CommandExecutor;
+
+struct TestCommand{}
+impl Command for TestCommand {
+    fn name(&self) -> &str { "test" }
+    
+    fn subcommand<'a>(&self) -> App<'a, 'a> {
+        SubCommand::with_name(self.name()).about("Test subcommand")
+    }
+
+    fn run(&self, _arg_matches: &ArgMatches, _: &ArgMatches) -> CommandError {
+        println!("hello test!");
+        Ok(None)
+    }
+}
+
+fn main() {
+    let mut c = CommandExecutor::new(None);
+    c.add(Box::new(TestCommand{}));
+    c.run().unwrap();
+}

src/util_clap.rs

@@ -0,0 +1,81 @@
+use std::process;
+use clap::{App, Arg, ArgMatches};
+use crate::XResult;
+use crate::util_msg;
+
+pub type CommandError = XResult<Option<i32>>;
+
+pub trait Command {
+    fn name(&self) -> &str;
+    fn subcommand<'a>(&self) -> App<'a, 'a>;
+    fn run(&self, arg_matches: &ArgMatches, _: &ArgMatches) -> CommandError;
+}
+
+pub trait DefaultCommand {
+    fn process_command<'a>(&self, app: App<'a, 'a>) -> App<'a, 'a>;
+    fn run(&self, arg_matches: &ArgMatches) -> CommandError;
+}
+
+pub struct DefaultCommandImpl {}
+impl DefaultCommand for DefaultCommandImpl {
+    fn process_command<'a>(&self, app: App<'a, 'a>) -> App<'a, 'a> {
+        app.arg(Arg::with_name("verbose").long("verbose").short("v").multiple(true).help("Show verbose info"))
+    }
+
+    fn run(&self, arg_matches: &ArgMatches) -> CommandError {
+        let verbose_count = arg_matches.occurrences_of("verbose");
+        util_msg::print_info(&format!("Verbose count: {}", verbose_count));
+        util_msg::print_info("This is default command cli, please run with help (--help)");
+        Ok(None)
+    }
+}
+
+pub struct CommandExecutor {
+    default_cmd: Option<Box<dyn DefaultCommand>>,
+    commands: Vec<Box<dyn Command>>,
+}
+
+impl CommandExecutor {
+    pub fn new(default_cmd: Option<Box<dyn DefaultCommand>>) -> Self {
+        CommandExecutor{
+            default_cmd,
+            commands: Vec::new(),
+        }
+    }
+
+    pub fn add(&mut self, cmd: Box<dyn Command>) -> &mut Self {
+        self.commands.push(cmd);
+        self
+    }
+
+    pub fn run(&self) -> CommandError {
+        let mut app = App::new(env!("CARGO_PKG_NAME"))
+                .version(env!("CARGO_PKG_VERSION"))
+                .about(env!("CARGO_PKG_DESCRIPTION"));
+        if let Some(default_cmd) = &self.default_cmd {
+            app = default_cmd.process_command(app);
+        }
+        for command in &self.commands {
+            app = app.subcommand(command.subcommand());
+        }
+        let matches = app.get_matches();
+        for command in &self.commands {
+            if let Some(sub_cmd_matches) = matches.subcommand_matches(command.name()) {
+                match command.run(&matches, sub_cmd_matches)? {
+                    None => return Ok(None),
+                    Some(code) => process::exit(code),
+                }
+            }
+        }
+        match &self.default_cmd {
+            None => {
+                util_msg::print_error("No default command, please try help (--help)");
+                process::exit(1);
+            },
+            Some(default_cmd) => match default_cmd.run(&matches)? {
+                None => return Ok(None),
+                Some(code) => process::exit(code),
+            },
+        }
+    }
+}