refactor of moving cargo wrapper handling to src/cli.rs

src/cli.rs

@@ -1,6 +1,6 @@
 use clap::{
     builder::{PathBufValueParser, PossibleValuesParser, TypedValueParser, ValueParserFactory},
-    Arg, Command, Parser, ValueEnum,
+    Arg, ArgMatches, Command, CommandFactory, FromArgMatches, Parser, ValueEnum,
 };
 use std::ffi::OsStr;
 use std::path::PathBuf;
@@ -9,7 +9,7 @@ use std::path::PathBuf;
 #[derive(Debug, Parser)]
 #[command(name = "cargo")]
 #[command(bin_name = "cargo")]
-pub enum CargoWrapper {
+enum CargoWrapper {
     GenerateRpm(Cli),
 }
 
@@ -88,6 +88,20 @@ pub struct Cli {
     pub variant: Vec<String>,
 }
 
+impl Cli {
+    pub fn get_matches_and_try_parse() -> Result<(Self, ArgMatches), clap::Error> {
+        let mut args = std::env::args();
+        let mut matches = if let Some("generate-rpm") = args.nth(1).as_deref() {
+            <CargoWrapper as CommandFactory>::command().get_matches()
+        } else {
+            <Self as CommandFactory>::command().get_matches()
+        };
+        let arg = Self::from_arg_matches_mut(&mut matches)?;
+
+        Ok((arg, matches))
+    }
+}
+
 impl Default for Cli {
     fn default() -> Self {
         Cli::parse_from([""])
@@ -176,8 +190,12 @@ mod tests {
     use super::*;
     #[test]
     fn verify_cli() {
-        use clap::CommandFactory;
-        Cli::command().debug_assert()
+        <Cli as CommandFactory>::command().debug_assert()
+    }
+
+    #[test]
+    fn verify_cargo_wrapper() {
+        <CargoWrapper as CommandFactory>::command().debug_assert()
     }
 
     #[test]

src/main.rs

@@ -1,6 +1,5 @@
 use crate::{build_target::BuildTarget, config::BuilderConfig};
-use clap::Parser;
-use cli::{CargoWrapper, Cli};
+use cli::Cli;
 use std::{
     fs,
     path::{Path, PathBuf},
@@ -54,13 +53,7 @@ fn determine_output_dir(
 }
 
 fn run() -> Result<(), Error> {
-    let mut args = std::env::args();
-    let args = if let Some("generate-rpm") = args.nth(1).as_deref() {
-        let CargoWrapper::GenerateRpm(args) = CargoWrapper::parse();
-        args
-    } else {
-        Cli::parse()
-    };
+    let (args, matcher) = Cli::get_matches_and_try_parse().unwrap_or_else(|e| e.exit());
 
     let build_target = BuildTarget::new(&args);
     let extra_metadata = collect_metadata(&args);