feat: CommandError -> CommandResult, add git check

src/cmd_crate.rs

@@ -3,7 +3,7 @@ use std::collections::HashMap;
 use std::time::Duration;
 use clap::{ArgMatches, SubCommand, App, Arg};
 use crates_io_api::{SyncClient, CrateResponse};
-use crate::cmd::{Command, CommandError};
+use crate::cmd::{Command, CommandResult};
 
 pub struct CommandImpl;
 
@@ -16,7 +16,7 @@ impl Command for CommandImpl {
         .arg(Arg::with_name("add").short("A").long("add").multiple(true).takes_value(true).help("Add crates to project"))
     }
 
-    fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
+    fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandResult {
         let crate_io_client = SyncClient::new(
             "cargotool (https://hatter.me/)", Duration::from_millis(1000)
         )?;
@@ -24,13 +24,13 @@ impl Command for CommandImpl {
         let toml_str = match fs::read_to_string("Cargo.toml") {
             Ok(s) => s, Err(e) => {
                 failure!("Read file Cargo.toml failed: {}", e);
-                return Ok(());
+                return Ok(-1);
             },
         };
         let mut toml: toml::Value = match toml_str.parse() {
             Ok(t) => t, Err(e) => {
                 failure!("Parse Cargo.toml failed: {}", e);
-                return Ok(());
+                return Ok(-1);
             },
         };
 
@@ -83,7 +83,7 @@ impl Command for CommandImpl {
             }
         }
 
-        Ok(())
+        Ok(0)
     }
 }