feat: list avaiables for clean,tree,update

Author: weihanglo

src/bin/cargo/commands/clean.rs

@@ -1,6 +1,7 @@
 use crate::command_prelude::*;
 
 use cargo::ops::{self, CleanOptions};
+use cargo::util::print_available_packages;
 
 pub fn cli() -> App {
     subcommand("clean")
@@ -18,6 +19,11 @@ pub fn cli() -> App {
 
 pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
     let ws = args.workspace(config)?;
+
+    if args.is_present_with_zero_values("package") {
+        print_available_packages(&ws)?;
+    }
+
     let opts = CleanOptions {
         config,
         spec: values(args, "package"),

src/bin/cargo/commands/tree.rs

@@ -4,6 +4,7 @@ use anyhow::{bail, format_err};
 use cargo::core::dependency::DepKind;
 use cargo::ops::tree::{self, EdgeKind};
 use cargo::ops::Packages;
+use cargo::util::print_available_packages;
 use cargo::util::CargoResult;
 use std::collections::HashSet;
 use std::str::FromStr;
@@ -176,6 +177,11 @@ subtree of the package given to -p.\n\
     }
 
     let ws = args.workspace(config)?;
+
+    if args.is_present_with_zero_values("package") {
+        print_available_packages(&ws)?;
+    }
+
     let charset = tree::Charset::from_str(args.value_of("charset").unwrap())
         .map_err(|e| anyhow::anyhow!("{}", e))?;
     let opts = tree::TreeOptions {

src/bin/cargo/commands/update.rs

@@ -1,6 +1,7 @@
 use crate::command_prelude::*;
 
 use cargo::ops::{self, UpdateOptions};
+use cargo::util::print_available_packages;
 
 pub fn cli() -> App {
     subcommand("update")
@@ -20,6 +21,10 @@ pub fn cli() -> App {
 pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
     let ws = args.workspace(config)?;
 
+    if args.is_present_with_zero_values("package") {
+        print_available_packages(&ws)?;
+    }
+
     let update_opts = UpdateOptions {
         aggressive: args.is_present("aggressive"),
         precise: args.value_of("precise"),