0.1.2 with anyhow error formatting

.github/workflows/check.yml

@@ -80,7 +80,7 @@ jobs:
     # https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability
     strategy:
       matrix:
-        msrv: [1.70.0]
+        msrv: [1.74.0]
     name: ubuntu / ${{ matrix.msrv }}
     steps:
       - uses: actions/checkout@v4

Cargo.toml

@@ -3,11 +3,11 @@ resolver = "2"
 members = ["cling", "cling-derive"]
 
 [workspace.package]
-version = "0.1.1"
+version = "0.1.2"
 edition = "2021"
 authors = ["Ahmed Farghal <me@asoli.dev>"]
 license = "Apache-2.0 OR MIT"
-rust-version = "1.70.0"                              # MSRV
+rust-version = "1.74.0"                              # MSRV
 keywords = ["click", "cli", "framework"]
 repository = "https://github.com/AhmedSoliman/cling"
 

README.md

@@ -40,7 +40,7 @@ For more details, see:
 - [docs.rs](https://docs.rs/cling/latest/cling/)
 - [examples](examples/)
 
-*Compiler support: [requires `rustc` 1.70+][msrv]*
+*Compiler support: [requires `rustc` 1.74+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -56,6 +56,7 @@ edition = "2021"
 
 [dependencies]
 clap = { version = "4.4.1", features = ["derive", "env"] }
+cling = { version = "0.1" }
 tokio = { version = "1.13.0", features = ["full"] }
 ```
 
@@ -341,7 +342,7 @@ Beep beep!
 
 # Supported Rust Versions
 
-Cling's minimum supported rust version is `1.70.0`.
+Cling's minimum supported rust version is `1.74.0`.
 
 # License
 

cling-derive/Cargo.toml

@@ -6,7 +6,7 @@ version.workspace = true
 authors.workspace = true
 license.workspace = true
 repository.workspace = true
-rust-version = "1.70.0"
+rust-version.workspace = true
 categories = [
     "command-line-interface",
     "development-tools::procedural-macro-helpers",

cling/Cargo.toml

@@ -6,24 +6,25 @@ version.workspace = true
 authors.workspace = true
 license.workspace = true
 repository.workspace = true
-rust-version = "1.70.0"
+rust-version.workspace = true
 categories = ["command-line-interface"]
 include = ["**/*.rs", "../README.md", "../LICENSE-*", "../examples"]
 readme = "../README.md"
 
 [dependencies]
 cling-derive = { path = "../cling-derive", version = "0.1", optional = true }
-clap = { version = "4.3.21", default-features = false, features = [
+clap = { version = "4", default-features = false, features = [
     "std",
     "derive",
 ] }
 anyhow = { version = "1.0" }
-async-trait = { version = "0.1.70" }
+async-trait = { version = "0.1.77" }
 indoc = { version = "2.0" }
+itertools = { version = "0.12.1" }
 rustversion = "1.0.14"
-shlex = { version = "1.1.0", optional = true }
+shlex = { version = "1.3.0", optional = true }
 static_assertions = { workspace = true }
-termcolor = { version = "1.2" }
+termcolor = { version = "1.4" }
 tracing = { version = "0.1.37", features = ["log"] }
 
 
@@ -40,8 +41,8 @@ colored = { version = "2.0" }
 # Use clap with default features in tests
 clap = { version = "4.3.21", default-features = true, features = ["derive"] }
 # For testing collecting external types
-clap-verbosity-flag = { version = "2.0.1" }
-env_logger = { version = "0.11.0" }
+clap-verbosity-flag = { version = "2.2.0" }
+env_logger = { version = "0.11.3" }
 log = { version = "0.4.20" }
 
 [build-dependencies]
@@ -82,6 +83,10 @@ required-features = ["shlex"]
 name = "many-handlers"
 path = "../examples/many_handlers.rs"
 
+[[example]]
+name = "errors"
+path = "../examples/errors.rs"
+
 [package.metadata.docs.rs]
 all-features = true
 default-target = "x86_64-unknown-linux-gnu"

cling/src/error.rs

@@ -2,6 +2,7 @@ use std::fmt::{self, Display, Formatter};
 use std::io::Write;
 
 use clap::CommandFactory;
+use itertools::{Itertools, Position};
 use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
 
 use crate::prelude::ClingFinished;
@@ -101,10 +102,10 @@ impl Display for CliError {
                 write!(f, "Error: {}", e)
             }
             | CliError::Other(e) => {
-                write!(f, "Error: {}", e)
+                write!(f, "Error: {:#}", e)
             }
             | CliError::OtherWithCode(e, _) => {
-                write!(f, "Error: {}", e)
+                write!(f, "Error: {:#}", e)
             }
             | CliError::InputString => {
                 write!(f, "Input string cannot be parsed as UNIX shell command")
@@ -154,10 +155,10 @@ impl CliError {
                 print_formatted_error(&mut stderr, "", e)
             }
             | CliError::Other(e) => {
-                print_formatted_error(&mut stderr, "Error: ", &e.to_string())
+                print_anyhow_error(&mut stderr, "Error: ", e)
             }
             | CliError::OtherWithCode(e, _) => {
-                print_formatted_error(&mut stderr, "Error: ", &e.to_string())
+                print_anyhow_error(&mut stderr, "Error: ", e)
             }
             | e @ CliError::InputString => {
                 print_formatted_error(&mut stderr, "", &e.to_string())
@@ -220,6 +221,40 @@ fn print_formatted_error(
     Ok(())
 }
 
+fn print_anyhow_error(
+    f: &mut StandardStream,
+    heading: &str,
+    err: &anyhow::Error,
+) -> std::io::Result<()> {
+    f.set_color(ColorSpec::new().set_fg(Some(Color::Red)).set_bold(true))?;
+    write!(f, "{}", heading)?;
+    f.reset()?;
+    writeln!(f, "{}", err)?;
+    err.chain()
+        .skip(1)
+        .with_position()
+        .for_each(|(position, cause)| {
+            if position == Position::First {
+                let _ =
+                    f.set_color(ColorSpec::new().set_fg(Some(Color::Magenta)));
+                let _ = writeln!(f, "");
+                let _ = writeln!(f, "Caused by:");
+                let _ = f.reset();
+            }
+            let symbol = if position == Position::Last {
+                "└─"
+            } else {
+                "├─"
+            };
+            let _ =
+                f.set_color(ColorSpec::new().set_italic(true).set_dimmed(true));
+            let _ = write!(f, "  {} ", symbol);
+            let _ = f.reset();
+            let _ = writeln!(f, "{}", cause);
+        });
+    Ok(())
+}
+
 pub(crate) fn format_clap_error<I: CommandFactory>(
     err: clap::Error,
 ) -> clap::Error {

examples/errors.rs

@@ -0,0 +1,26 @@
+use cling::prelude::*;
+
+#[derive(Run, Parser, Debug, Clone)]
+#[cling(run = "run")]
+pub struct App {}
+
+// handlers can be sync or async, cling will handle this transparently.
+async fn run() -> anyhow::Result<()> {
+    let err1 = std::io::Error::new(
+        std::io::ErrorKind::BrokenPipe,
+        "Fatal disk IO Error!",
+    );
+    let err2 = anyhow::Error::new(err1).context("Trying to read a file");
+    let err3 = err2.context("Can't load application");
+    let err4 = err3.context("App level error");
+    Err(err4)
+}
+
+#[tokio::main]
+async fn main() -> ClingFinished<App> {
+    env_logger::builder().init();
+    // Cling::parse().run().await
+    // Or, return ClingFinished<T> to let cling handle error printing and exit
+    // code in a more convenient way.
+    Cling::parse_and_run().await
+}