feat: support color (#48)

close #37

Cargo.toml

@@ -13,16 +13,12 @@ keywords = ["command-line", "shell-script", "argument-parser"]
 
 [dependencies]
 anyhow = "1"
+clap = { version = "4.0", features = ["string"]}
 convert_case = "0.5"
 indexmap = "1.9"
 nom = "7.1"
 either = "1.8"
 
-[dependencies.clap]
-version = "4.0.0-rc.2"
-default_features = false
-features = ["std", "suggestions", "string", "help", "usage", "error-context"]
-
 [dev-dependencies]
 insta = "1.15"
 assert_cmd = "2"

src/cli.rs

@@ -9,12 +9,12 @@ use std::collections::HashMap;
 
 const ENTRYPOINT: &str = "main";
 
-pub fn eval(source: &str, args: &[&str]) -> Result<Either<String, String>> {
+pub fn eval(source: &str, args: &[&str]) -> Result<Either<String, clap::Error>> {
     let events = parse(source)?;
     let cmd = Cli::new_from_events(&events)?;
     match cmd.eval(args)? {
         Either::Left(values) => Ok(Either::Left(ArgcValue::to_shell(values))),
-        Either::Right(error) => Ok(Either::Right(error.to_string())),
+        Either::Right(error) => Ok(Either::Right(error)),
     }
 }
 

src/main.rs

@@ -73,12 +73,20 @@ USAGE:{usage}"#,
         let (source, cmd_args) = parse_script_args(&script_args)?;
         let cmd_args: Vec<&str> = cmd_args.iter().map(|v| v.as_str()).collect();
         match argc::eval(&source, &cmd_args)? {
-            Either::Left(stdout) => {
-                println!("{}", stdout)
+            Either::Left(output) => {
+                println!("{}", output)
             }
-            Either::Right(stderr) => {
-                eprintln!("{}", stderr);
-                println!("exit 1");
+            Either::Right(error) => {
+                if env::var_os("NO_COLOR").is_some() {
+                    eprintln!("{}", error);
+                } else {
+                    eprintln!("{}", error.render().ansi());
+                }
+                if error.use_stderr() {
+                    println!("exit 1");
+                } else {
+                    println!("exit 0");
+                }
             }
         }
     }

tests/macros.rs

@@ -6,7 +6,7 @@ macro_rules! snapshot {
     ) => {
         let (stdout, stderr) = match argc::eval($source, $args).unwrap() {
             either::Either::Left(stdout) => (stdout, String::new()),
-            either::Either::Right(stderr) => (String::new(), stderr),
+            either::Either::Right(stderr) => (String::new(), stderr.to_string()),
         };
 
         let args = $args.join(" ");
@@ -36,7 +36,7 @@ macro_rules! plain {
     ) => {
         let result = match argc::eval($source, $args).unwrap()  {
             either::Either::Left(stdout) => (stdout, String::new()),
-            either::Either::Right(stderr) => (String::new(), stderr),
+            either::Either::Right(stderr) => (String::new(), stderr.to_string()),
         };
         $({
             assert_eq!(result.0.as_str(), $stdout);