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Use anyhow for idiomatic error handling
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Good for CLI applications, it provides some nicer ergonomics, features
to inject context if needed, as well as non-trivial optimizations
compared to using `Box<dyn Error>`.

For the xtasks use case, I'm going with the simpler `anyhow` over
something like `color-eyre`, which supports more complicated output
formatting (but has other trade-offs).

See:
- dtolnay/anyhow#96
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elasticdog committed May 13, 2023
1 parent 9b64f9d commit 1422b7b
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Showing 4 changed files with 32 additions and 30 deletions.
7 changes: 7 additions & 0 deletions Cargo.lock

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1 change: 1 addition & 0 deletions xtask/Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -9,4 +9,5 @@ publish = false
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
anyhow = "1.0.71"
xshell = "0.2.2"
26 changes: 12 additions & 14 deletions xtask/src/fixup.rs
Original file line number Diff line number Diff line change
@@ -1,20 +1,18 @@
use std::{
fs,
path::{Path, PathBuf},
};

use anyhow::Result;
use std::fs;
use std::path::{Path, PathBuf};
use xshell::{cmd, Shell};

use crate::{project_root, verbose_cd, DynError};
use crate::{project_root, verbose_cd};

pub fn format_cue() -> Result<(), DynError> {
pub fn format_cue() -> Result<()> {
let sh = Shell::new()?;
verbose_cd(&sh, cue_dir());
cmd!(sh, "cue fmt --simplify").run()?;
Ok(())
}

pub fn format_markdown() -> Result<(), DynError> {
pub fn format_markdown() -> Result<()> {
let sh = Shell::new()?;
let root = project_root();
verbose_cd(&sh, &root);
Expand All @@ -32,21 +30,21 @@ pub fn format_markdown() -> Result<(), DynError> {
Ok(())
}

pub fn format_rust() -> Result<(), DynError> {
pub fn format_rust() -> Result<()> {
let sh = Shell::new()?;
verbose_cd(&sh, project_root());
cmd!(sh, "cargo fmt").run()?;
Ok(())
}

pub fn lint_cue() -> Result<(), DynError> {
pub fn lint_cue() -> Result<()> {
let sh = Shell::new()?;
verbose_cd(&sh, cue_dir());
cmd!(sh, "cue vet --concrete").run()?;
Ok(())
}

pub fn lint_rust() -> Result<(), DynError> {
pub fn lint_rust() -> Result<()> {
let sh = Shell::new()?;
verbose_cd(&sh, project_root());
cmd!(
Expand All @@ -67,14 +65,14 @@ pub fn lint_rust() -> Result<(), DynError> {
Ok(())
}

pub fn regenerate_ci_yaml() -> Result<(), DynError> {
pub fn regenerate_ci_yaml() -> Result<()> {
let sh = Shell::new()?;
verbose_cd(&sh, cue_dir());
cmd!(sh, "cue cmd regen-ci-yaml").run()?;
Ok(())
}

pub fn spellcheck() -> Result<(), DynError> {
pub fn spellcheck() -> Result<()> {
let sh = Shell::new()?;
verbose_cd(&sh, project_root());
cmd!(sh, "codespell --write-changes").run()?;
Expand All @@ -85,7 +83,7 @@ fn cue_dir() -> PathBuf {
project_root().join(".github/cue")
}

fn find_markdown_files<P: AsRef<Path>>(dir: P) -> Result<Vec<PathBuf>, DynError> {
fn find_markdown_files<P: AsRef<Path>>(dir: P) -> Result<Vec<PathBuf>> {
let mut result = Vec::new();
for entry in fs::read_dir(dir)? {
let path = entry?.path();
Expand Down
28 changes: 12 additions & 16 deletions xtask/src/main.rs
Original file line number Diff line number Diff line change
@@ -1,15 +1,11 @@
use std::{
env,
error::Error,
path::{Path, PathBuf},
};
use anyhow::Result;
use std::env;
use std::path::{Path, PathBuf};
use xshell::Shell;

mod fixup;

type DynError = Box<dyn Error>;

fn main() -> Result<(), DynError> {
fn main() -> Result<()> {
let task = env::args().nth(1);
match task {
None => tasks::print_help()?,
Expand All @@ -20,7 +16,7 @@ fn main() -> Result<(), DynError> {
"fixup.markdown" => tasks::fixup_markdown()?,
"fixup.rust" => tasks::fixup_rust()?,
"fixup.spelling" => tasks::fixup_spelling()?,
invalid => return Err(format!("Invalid task name: {}", invalid).into()),
invalid => return Err(anyhow::anyhow!("Invalid task name: {}", invalid)),
},
};
Ok(())
Expand All @@ -30,7 +26,7 @@ pub mod tasks {
use crate::fixup::{format_cue, format_markdown, format_rust};
use crate::fixup::{lint_cue, lint_rust};
use crate::fixup::{regenerate_ci_yaml, spellcheck};
use crate::DynError;
use anyhow::Result;

const HELP: &str = "\
NAME
Expand All @@ -48,33 +44,33 @@ COMMANDS
fixup.rust Fix lints and format Rust files in-place.
";

pub fn fixup() -> Result<(), DynError> {
pub fn fixup() -> Result<()> {
fixup_spelling()?; // affects all file types; run this first
fixup_github_actions()?;
fixup_markdown()?;
fixup_rust()
}

pub fn fixup_github_actions() -> Result<(), DynError> {
pub fn fixup_github_actions() -> Result<()> {
lint_cue()?;
format_cue()?;
regenerate_ci_yaml()
}

pub fn fixup_markdown() -> Result<(), DynError> {
pub fn fixup_markdown() -> Result<()> {
format_markdown()
}

pub fn fixup_rust() -> Result<(), DynError> {
pub fn fixup_rust() -> Result<()> {
lint_rust()?;
format_rust()
}

pub fn fixup_spelling() -> Result<(), DynError> {
pub fn fixup_spelling() -> Result<()> {
spellcheck()
}

pub fn print_help() -> Result<(), DynError> {
pub fn print_help() -> Result<()> {
print!("{}", HELP);
Ok(())
}
Expand Down

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