chore(nargo): report bubbled up errors using eyre (#907)

* chore(nargo): report errors using anyhow

* chore: replace anyhow with eyre

crates/nargo/src/cli/mod.rs

@@ -5,6 +5,8 @@ use noirc_driver::Driver;
 use noirc_frontend::graph::{CrateName, CrateType};
 use std::path::{Path, PathBuf};
 
+use color_eyre::eyre;
+
 mod fs;
 
 mod check_cmd;
@@ -55,10 +57,10 @@ enum NargoCommand {
     Gates(gates_cmd::GatesCommand),
 }
 
-pub fn start_cli() {
+pub fn start_cli() -> eyre::Result<()> {
     let matches = NargoCli::parse();
 
-    let result = match matches.command {
+    match matches.command {
         NargoCommand::New(args) => new_cmd::run(args, matches.config),
         NargoCommand::Check(args) => check_cmd::run(args, matches.config),
         NargoCommand::Compile(args) => compile_cmd::run(args, matches.config),
@@ -68,10 +70,9 @@ pub fn start_cli() {
         NargoCommand::Test(args) => test_cmd::run(args, matches.config),
         NargoCommand::Gates(args) => gates_cmd::run(args, matches.config),
         NargoCommand::Contract(args) => contract_cmd::run(args, matches.config),
-    };
-    if let Err(err) = result {
-        err.write()
-    }
+    }?;
+
+    Ok(())
 }
 
 // helper function which tests noir programs by trying to generate a proof and verify it

crates/nargo/src/errors.rs

@@ -1,8 +1,7 @@
 use acvm::OpcodeResolutionError;
 use hex::FromHexError;
 use noirc_abi::errors::{AbiError, InputParserError};
-use std::{io::Write, path::PathBuf};
-use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
+use std::path::PathBuf;
 use thiserror::Error;
 
 #[derive(Debug, Error)]
@@ -31,18 +30,6 @@ impl From<OpcodeResolutionError> for CliError {
     }
 }
 
-impl CliError {
-    pub(crate) fn write(&self) -> ! {
-        let mut stderr = StandardStream::stderr(ColorChoice::Always);
-        stderr
-            .set_color(ColorSpec::new().set_fg(Some(Color::Red)))
-            .expect("cannot set color for stderr in StandardStream");
-        writeln!(&mut stderr, "{self}").expect("cannot write to stderr");
-
-        std::process::exit(1)
-    }
-}
-
 impl From<InputParserError> for CliError {
     fn from(error: InputParserError) -> Self {
         CliError::Generic(error.to_string())

crates/nargo/src/main.rs

@@ -1,15 +1,15 @@
 #![forbid(unsafe_code)]
 
-use color_eyre::config::HookBuilder;
+use color_eyre::{config::HookBuilder, eyre};
 use nargo::cli::start_cli;
 
-fn main() {
+fn main() -> eyre::Result<()> {
     // Register a panic hook to display more readable panic messages to end-users
     let (panic_hook, _) = HookBuilder::default()
         .display_env_section(false)
         .panic_section("This is a bug. Consider opening an issue at https://github.com/noir-lang/noir/issues/new?labels=bug&template=bug_report.md")
         .into_hooks();
     panic_hook.install();
 
-    start_cli();
+    start_cli()
 }