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Reviewer's GuideThis PR scaffolds a new Rust toy application for E2E tests, including a clap-based CLI, build.rs-driven man page generation, project configuration for Rust 2024 with an MSRV of 1.89, accompanying unit and integration tests, and updates to pipeline documentation. Sequence diagram for rust-toy-app CLI execution flowsequenceDiagram
participant User as actor User
participant Main as main()
participant Cli as Cli
User->>Main: Run rust-toy-app binary
Main->>Cli: Cli::parse()
Main->>Cli: cli.run()
Cli-->>Main: "Hello, {name}!"
Main->>User: Print greeting
Sequence diagram for build.rs man page generationsequenceDiagram
participant BuildScript as build.rs
participant Cli as cli::command()
participant ClapMangen as clap_mangen::Man
participant File as File
BuildScript->>Cli: command()
BuildScript->>ClapMangen: Man::new(cmd)
BuildScript->>ClapMangen: render()
ClapMangen-->>BuildScript: man page buffer
BuildScript->>File: create(rust-toy-app.1)
BuildScript->>File: write_all(buffer)
File-->>BuildScript: success
File-Level Changes
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Summary by CodeRabbit
WalkthroughAdd a new Rust toy CLI crate with Clap-based parsing, a build script that generates a man page via clap_mangen, unit and integration tests, and documentation updates reflecting Phase 1 status and design decisions. No changes to Phase 2 or packaging. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
actor Dev as Developer
participant Cargo as Cargo Build
participant BuildRS as build.rs
participant CliMod as cli::command()
participant Mangen as clap_mangen
participant FS as File System (OUT_DIR)
Dev->>Cargo: cargo build
rect rgba(200,230,255,0.25)
note right of Cargo: Build script phase
Cargo->>BuildRS: Execute build.rs
BuildRS->>CliMod: Load command definition
BuildRS->>Mangen: Generate man from Command
Mangen-->>BuildRS: Man page bytes
BuildRS->>FS: Write rust-toy-app.1
end
Cargo-->>Dev: Build artefacts incl. man page
sequenceDiagram
autonumber
actor User
participant Bin as rust-toy-app (binary)
participant Clap as Clap Parser
participant Cli as Cli::run()
participant Out as stdout
User->>Bin: Invoke [--name NAME]
Bin->>Clap: Parse args
Clap-->>Bin: Cli instance
Bin->>Cli: run()
Cli-->>Bin: "Hello, {name}!"
Bin->>Out: Print greeting
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes Poem
✨ Finishing Touches
🧪 Generate unit tests
Comment |
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Hey there - I've reviewed your changes and they look great!
Prompt for AI Agents
Please address the comments from this code review:
## Individual Comments
### Comment 1
<location> `rust-toy-app/build.rs:9` </location>
<code_context>
+#[path = "src/cli.rs"]
+mod cli;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+ let out_dir = PathBuf::from(env::var("OUT_DIR")?);
+ let cmd = cli::command();
+ let man = clap_mangen::Man::new(cmd);
+ let mut buffer = Vec::new();
+ man.render(&mut buffer)?;
+ let mut out = File::create(out_dir.join("rust-toy-app.1"))?;
+ out.write_all(&buffer)?;
+ Ok(())
+}
</code_context>
<issue_to_address>
The build script writes the man page to OUT_DIR, but does not print rerun-if-changed directives.
Add println!("cargo:rerun-if-changed=src/cli.rs"); and println!("cargo:rerun-if-changed=build.rs"); to ensure the build script reruns when these files change, preventing stale man pages.
</issue_to_address>Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
| fn main() -> Result<(), Box<dyn std::error::Error>> { | ||
| let out_dir = PathBuf::from(env::var("OUT_DIR")?); | ||
| let cmd = cli::command(); | ||
| let man = clap_mangen::Man::new(cmd); | ||
| let mut buffer = Vec::new(); | ||
| man.render(&mut buffer)?; | ||
| let mut out = File::create(out_dir.join("rust-toy-app.1"))?; | ||
| out.write_all(&buffer)?; | ||
| Ok(()) |
There was a problem hiding this comment.
suggestion (bug_risk): The build script writes the man page to OUT_DIR, but does not print rerun-if-changed directives.
Add println!("cargo:rerun-if-changed=src/cli.rs"); and println!("cargo:rerun-if-changed=build.rs"); to ensure the build script reruns when these files change, preventing stale man pages.
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
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Actionable comments posted: 15
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (2)
docs/rust-build-release-pipeline.md (2)
346-347: Fix backtick in inline code.Close the backtick around
cargo_mangen.- - [ ] Add `cargo_mangen step and validate that a manpage is correctly produced by + - [ ] Add `cargo_mangen` step and validate that a manpage is correctly produced by
126-129: Document lower-overhead alternative to build.rs for man pages.Note the
xtaskapproach as an alternative to reduce build-time cost.Add after the paragraph:
Tip: Generate man pages via a dedicated cargo “xtask” rather than
build.rsto avoid recompiling the CLI inside the build script and to keep normal builds lean.
📜 Review details
Configuration used: CodeRabbit UI
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Plan: Pro
⛔ Files ignored due to path filters (1)
rust-toy-app/Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (7)
docs/rust-build-release-pipeline.md(2 hunks)rust-toy-app/Cargo.toml(1 hunks)rust-toy-app/build.rs(1 hunks)rust-toy-app/src/cli.rs(1 hunks)rust-toy-app/src/lib.rs(1 hunks)rust-toy-app/src/main.rs(1 hunks)rust-toy-app/tests/cli.rs(1 hunks)
🧰 Additional context used
📓 Path-based instructions (3)
**/*.rs
⚙️ CodeRabbit configuration file
**/*.rs: * Seek to keep the cyclomatic complexity of functions no more than 12.
Adhere to single responsibility and CQRS
Place function attributes after doc comments.
Do not use
returnin single-line functions.Move conditionals with >2 branches into a predicate function.
Avoid
unsafeunless absolutely necessary.Every module must begin with a
//!doc comment that explains the module's purpose and utility.Comments and docs must follow en-GB-oxendict (-ize / -our) spelling and grammar
Lints must not be silenced except as a last resort.
#[allow]is forbidden.- Only narrowly scoped
#[expect(lint, reason = "...")]is allowed.- No lint groups, no blanket or file-wide suppression.
- Include
FIXME:with link if a fix is expected.Where code is only used by specific features, it must be conditionally compiled or a conditional expectation for unused_code applied.
Use
rstestfixtures for shared setup and to avoid repetition between tests.Replace duplicated tests with
#[rstest(...)]parameterised cases.Prefer
mockallfor mocks/stubs.Prefer
.expect()over.unwrap()Ensure that any API or behavioural changes are reflected in the documentation in
docs/Ensure that any completed roadmap steps are recorded in the appropriate roadmap in
docs/Files must not exceed 400 lines in length
- Large modules must be decomposed
- Long match statements or dispatch tables should be decomposed by domain and collocated with targets
- Large blocks of inline data (e.g., test fixtures, constants or templates) must be moved to external files and inlined at compile-time or loaded at run-time.
Environment access (env::set_var and env::remove_var) are always unsafe in Rust 2024 and MUST be marked as such
- For testing of functionality depending upon environment variables, dependency injection and the
mockablecrate are the preferred option.- If mockable cannot be used, env mutations in tests ...
Files:
rust-toy-app/src/main.rsrust-toy-app/tests/cli.rsrust-toy-app/build.rsrust-toy-app/src/cli.rsrust-toy-app/src/lib.rs
{README.md,docs/**}
📄 CodeRabbit inference engine (.rules/python-00.md)
Colocate documentation near reusable packages: keep README.md or docs/ and include usage examples
Files:
docs/rust-build-release-pipeline.md
**/*.md
⚙️ CodeRabbit configuration file
**/*.md: * Avoid 2nd person or 1st person pronouns ("I", "you", "we")
- Use en-GB-oxendict (-ize / -our) spelling and grammar
- Headings must not be wrapped.
- Documents must start with a level 1 heading
- Headings must correctly increase or decrease by no more than one level at a time
- Use GitHub-flavoured Markdown style for footnotes and endnotes.
- Numbered footnotes must be numbered by order of appearance in the document.
Files:
docs/rust-build-release-pipeline.md
🧬 Code graph analysis (3)
rust-toy-app/src/main.rs (1)
rust-toy-app/src/cli.rs (1)
run(12-15)
rust-toy-app/build.rs (2)
rust-toy-app/src/main.rs (1)
main(4-7)rust-toy-app/src/cli.rs (1)
command(18-20)
rust-toy-app/src/lib.rs (1)
rust-toy-app/src/cli.rs (1)
run(12-15)
🔍 Remote MCP
Additional Context for PR Review
-
Rust Minimum Supported Version (MSRV) and Edition
- The PR sets
rust-version = "1.89"andedition = "2024"in the newrust-toy-app/Cargo.toml. Rust 1.89.0 was released on August 7, 2025, making this exactly the current stable version at the time of this PR (blog.rust-lang.org).
- The PR sets
-
Clap and Man-Page Generation
- The PR uses
clap = { version = "4", features = ["derive"] }alongsideclap_mangen = "0.2"in build-dependencies. Theclap_mangencrate (0.2.x series) is actively maintained, with 37 patch releases up to v0.2.23 as of July 25, 2024 (lib.rs). - Note:
clap_mangen’s own documentation recommends using a dedicated cargo “xtask” instead of abuild.rsto avoid build-time overhead:Tip: Consider a cargo xtask instead of a
build.rsto reduce build costs. (lib.rs)
- The PR uses
-
Testing Libraries Versions
assert_cmd = "2"is at v2.0.17 (released April 16, 2025), which adds acargo_bin!macro for custom build directories (docs.rs).predicates = "3"is at v3.1.3 (released December 19, 2024), providing default features for matching CLI output in tests (lib.rs).rstest = "0.21"was released June 1, 2024, offering procedural-macro-driven fixtures and parameterized tests (docs.rs).
-
Packaging Considerations
- The PR updates Phase 1 of the release pipeline docs to mark the toy-app task complete and adds man-page generation logic, but leaves Phase 2 (packaging) unchanged. Reviewers might verify that the pipeline’s packaging step includes the generated
rust-toy-app.1man page (e.g., viaEXTRA_FILESor similar artifact inputs) to ensure it’s published alongside binaries.
- The PR updates Phase 1 of the release pipeline docs to mark the toy-app task complete and adds man-page generation logic, but leaves Phase 2 (packaging) unchanged. Reviewers might verify that the pipeline’s packaging step includes the generated
These points should help confirm that the chosen crate versions align with current stable releases, acknowledge a potential build-time trade-off in using build.rs, and highlight a packaging consideration for the generated man page.
🔇 Additional comments (2)
rust-toy-app/tests/cli.rs (1)
10-10: Approve binary name test
package.name matches “rust-toy-app”.rust-toy-app/src/cli.rs (1)
18-20: Drop build-dependencies verification
clapwith thederivefeature is already listed under[build-dependencies].
| use std::env; | ||
| use std::fs::File; | ||
| use std::io::Write; | ||
| use std::path::PathBuf; | ||
|
|
There was a problem hiding this comment.
🛠️ Refactor suggestion
Import time for reproducible dates.
Prepare for SOURCE_DATE_EPOCH handling.
use std::env;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;
+use time::{format_description::well_known::Iso8601, OffsetDateTime};📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| use std::env; | |
| use std::fs::File; | |
| use std::io::Write; | |
| use std::path::PathBuf; | |
| use std::env; | |
| use std::fs::File; | |
| use std::io::Write; | |
| use std::path::PathBuf; | |
| use time::{format_description::well_known::Iso8601, OffsetDateTime}; |
🤖 Prompt for AI Agents
In rust-toy-app/build.rs around lines 1 to 5, add imports and logic to support
reproducible builds via SOURCE_DATE_EPOCH: import std::time::{SystemTime,
UNIX_EPOCH} (in addition to existing std::env, std::fs::File, std::io::Write,
std::path::PathBuf), then when producing any build-time timestamp read
SOURCE_DATE_EPOCH from the environment and parse it as u64 if present, otherwise
compute the current UNIX timestamp from
SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(); use that
resulting seconds value for any generated timestamps so builds respect
SOURCE_DATE_EPOCH.
| #[path = "src/cli.rs"] | ||
| mod cli; |
There was a problem hiding this comment.
🧹 Nitpick (assertive)
Avoid duplicating CLI in the build script long-term.
Move man-page generation to an xtask to reduce compile-time and dependency load in build.rs.
🤖 Prompt for AI Agents
In rust-toy-app/build.rs around lines 6-7, the build script pulls in the CLI via
#[path = "src/cli.rs"] mod cli; and duplicates CLI logic for man-page
generation; move man-page generation out of build.rs into an xtask to avoid
increasing compile-time and dependency load. Create an xtask binary crate (e.g.
workspace member xtask) that depends on the real crate or reads its CLI
definition to generate man pages, implement the existing man-generation logic
there, update CI/build documentation to run cargo run -p xtask -- man (or
similar) as part of release/docs, and remove the #[path = "src/cli.rs"] mod cli;
and any man-generation invocation from build.rs so build.rs contains only
minimal build-time tasks.
| fn main() -> Result<(), Box<dyn std::error::Error>> { | ||
| let out_dir = PathBuf::from(env::var("OUT_DIR")?); | ||
| let cmd = cli::command(); | ||
| let man = clap_mangen::Man::new(cmd); | ||
| let mut buffer = Vec::new(); | ||
| man.render(&mut buffer)?; | ||
| let mut out = File::create(out_dir.join("rust-toy-app.1"))?; | ||
| out.write_all(&buffer)?; | ||
| Ok(()) | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Make man-page generation reproducible and incremental.
Emit rerun-if-changed and honour SOURCE_DATE_EPOCH.
fn main() -> Result<(), Box<dyn std::error::Error>> {
+ // Re-run when CLI definition changes.
+ println!("cargo:rerun-if-changed=src/cli.rs");
let out_dir = PathBuf::from(env::var("OUT_DIR")?);
let cmd = cli::command();
- let man = clap_mangen::Man::new(cmd);
+ let date = env::var("SOURCE_DATE_EPOCH")
+ .ok()
+ .and_then(|s| s.parse::<i64>().ok())
+ .and_then(|ts| OffsetDateTime::from_unix_timestamp(ts).ok())
+ .and_then(|dt| dt.format(&Iso8601::DATE).ok())
+ .unwrap_or_else(|| "1970-01-01".to_string());
+ let man = clap_mangen::Man::new(cmd).date(date);
let mut buffer = Vec::new();
man.render(&mut buffer)?;
let mut out = File::create(out_dir.join("rust-toy-app.1"))?;
out.write_all(&buffer)?;
Ok(())
}Committable suggestion skipped: line range outside the PR's diff.
🤖 Prompt for AI Agents
In rust-toy-app/build.rs around lines 9 to 18, the build script currently
renders the man page unconditionally and non-deterministically; update it to
emit cargo rerun hints and honor SOURCE_DATE_EPOCH: add
println!("cargo:rerun-if-changed=<path>") entries for the build script and any
source files that influence cli::command (e.g., src/cli.rs or src/main.rs) so
Cargo only rebuilds the man page when those inputs change, and read the
SOURCE_DATE_EPOCH env var (if present) to set a fixed/ reproducible date on the
clap_mangen::Man instance (or clear the date) before rendering so the output is
deterministic across builds.
| [package] | ||
| name = "rust-toy-app" | ||
| version = "0.1.0" | ||
| edition = "2024" | ||
| rust-version = "1.89" | ||
|
|
There was a problem hiding this comment.
🛠️ Refactor suggestion
Add minimal package metadata and mark as non-publishable.
Avoid crates.io warnings and accidental publishes for a toy crate.
Apply:
[package]
name = "rust-toy-app"
version = "0.1.0"
edition = "2024"
rust-version = "1.89"
+description = "Toy CLI used for E2E tests in shared-actions"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/leynos/shared-actions"
+publish = false📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| [package] | |
| name = "rust-toy-app" | |
| version = "0.1.0" | |
| edition = "2024" | |
| rust-version = "1.89" | |
| [package] | |
| name = "rust-toy-app" | |
| version = "0.1.0" | |
| edition = "2024" | |
| rust-version = "1.89" | |
| description = "Toy CLI used for E2E tests in shared-actions" | |
| license = "MIT OR Apache-2.0" | |
| repository = "https://github.com/leynos/shared-actions" | |
| publish = false |
🤖 Prompt for AI Agents
In rust-toy-app/Cargo.toml around lines 1 to 6, the package lacks minimal
metadata and isn't marked non-publishable; add basic fields (description,
authors or maintainers, license or license-file, repository if available) and
set publish = false under the [package] section to avoid crates.io warnings and
prevent accidental publishing.
| name = "rust-toy-app" | ||
| version = "0.1.0" | ||
| edition = "2024" | ||
| rust-version = "1.89" |
There was a problem hiding this comment.
🧹 Nitpick (assertive)
Enforce MSRV in tooling.
Pin the toolchain so CI and local devs build with Rust 1.89.
Add a file at rust-toy-app/rust-toolchain.toml:
[toolchain]
channel = "1.89.0"
components = ["clippy", "rustfmt"]
profile = "minimal"🤖 Prompt for AI Agents
In rust-toy-app/Cargo.toml around line 5 the MSRV is declared but tooling is not
pinned; create a new file rust-toy-app/rust-toolchain.toml at the repo with the
toolchain locked to 1.89.0 and include clippy and rustfmt components and a
minimal profile so CI and local devs use the same Rust toolchain (channel =
"1.89.0", components = ["clippy", "rustfmt"], profile = "minimal").
| #[test] | ||
| fn run_returns_greeting() { | ||
| let cli = Cli { name: Some("Alice".into()) }; | ||
| assert_eq!(cli.run(), "Hello, Alice!"); | ||
| } |
There was a problem hiding this comment.
🧹 Nitpick (assertive)
Parametrise with rstest.
Replace duplicated cases with parameterised tests per guidelines.
Example:
use rstest::rstest;
#[rstest]
#[case(&["rust-toy-app"], "Hello, world!")]
#[case(&["rust-toy-app", "--name", "Alice"], "Hello, Alice!")]
fn run_returns_greeting(#[case] args: &[&str], #[case] expected: &str) {
let cli = Cli::parse_from(args);
assert_eq!(cli.run(), expected);
}🤖 Prompt for AI Agents
In rust-toy-app/src/lib.rs around lines 7 to 11, the current test duplicates
cases and should be converted to a parameterised rstest: add use rstest::rstest
at the top, replace the single test with a #[rstest] function that accepts two
cases (one for default invocation and one for --name "Alice"), change the test
to build the CLI via Cli::parse_from(args) and compare cli.run() to the expected
value, and add #[case] annotations for each args/expected pair to drive the
parameterised assertions.
🧹 Nitpick (assertive)
Avoid struct-literal construction across modules; parse args instead.
Do not rely on field visibility for tests; use Cli::parse_from for stability.
#[test]
fn run_returns_greeting() {
- let cli = Cli { name: Some("Alice".into()) };
+ let cli = Cli::parse_from(["rust-toy-app", "--name", "Alice"]);
assert_eq!(cli.run(), "Hello, Alice!");
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| #[test] | |
| fn run_returns_greeting() { | |
| let cli = Cli { name: Some("Alice".into()) }; | |
| assert_eq!(cli.run(), "Hello, Alice!"); | |
| } | |
| #[test] | |
| fn run_returns_greeting() { | |
| let cli = Cli::parse_from(["rust-toy-app", "--name", "Alice"]); | |
| assert_eq!(cli.run(), "Hello, Alice!"); | |
| } |
🤖 Prompt for AI Agents
In rust-toy-app/src/lib.rs around lines 7 to 11, the test constructs Cli via a
struct literal which relies on field visibility; replace that with constructing
the CLI via Cli::parse_from (e.g. passing program name and the name argument) so
the test exercises argument parsing instead of internal fields, then call run()
and assert the returned greeting is "Hello, Alice!" to keep the test stable
across module boundary changes.
| #[rstest] | ||
| #[case::named(&["--name", "Bob"][..], "Hello, Bob!\n")] | ||
| #[case::default(&[][..], "Hello, world!\n")] |
There was a problem hiding this comment.
🧹 Nitpick (assertive)
Add a short-flag case and basic help/version smoke tests
Exercise -n alongside --name, and assert help/version to lock the public CLI surface.
Extend the parameterised cases:
#[rstest]
#[case::named(&["--name", "Bob"][..], "Hello, Bob!\n")]
+#[case::short(&["-n", "Bob"][..], "Hello, Bob!\n")]
#[case::default(&[][..], "Hello, world!\n")]Add a new test:
use predicates::str::{contains, starts_with};
#[test]
fn prints_help_and_version() {
// help
Command::cargo_bin("rust-toy-app")
.expect("binary should build")
.arg("--help")
.assert()
.success()
.stdout(contains("A toy app for E2E tests"));
// version
Command::cargo_bin("rust-toy-app")
.expect("binary should build")
.arg("--version")
.assert()
.success()
.stdout(starts_with(env!("CARGO_PKG_VERSION")));
}🤖 Prompt for AI Agents
In rust-toy-app/tests/cli.rs around lines 6 to 8, the parameterised test cases
only exercise the long `--name` flag and default, and there are no smoke tests
for help/version; add a third case that passes the short `-n` flag (e.g.,
&["-n", "Bob"][..], "Hello, Bob!\n") to mirror the existing `--name` case, and
add a new test function `prints_help_and_version` that runs the built binary
with `--help` and asserts stdout contains the crate description (e.g., "A toy
app for E2E tests") and runs it with `--version` and asserts stdout starts with
env!("CARGO_PKG_VERSION") using `predicates::str::{contains, starts_with}` to
lock the public CLI surface.
| for a in args { | ||
| cmd.arg(a); | ||
| } |
There was a problem hiding this comment.
🧹 Nitpick (assertive)
Collapse the arg loop into .args(args)
Reduce noise and keep intent clear.
Apply:
- for a in args {
- cmd.arg(a);
- }
+ cmd.args(args);📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| for a in args { | |
| cmd.arg(a); | |
| } | |
| cmd.args(args); |
🤖 Prompt for AI Agents
In rust-toy-app/tests/cli.rs around lines 11 to 13, the loop that calls
cmd.arg(a) for each element should be collapsed into a single call to
cmd.args(args) to reduce noise; replace the for-loop with cmd.args(args),
ensuring the variable passed is an iterator or slice of &str (or convert with
args.iter().map(|s| s.as_str()) as needed) so types and ownership remain
correct.
1 participant
Summary
rust-toy-appwith clap-based CLI and build.rs generating man pageTesting
cargo test --manifest-path rust-toy-app/Cargo.tomlmake lintmake markdownlintmake testhttps://chatgpt.com/codex/tasks/task_e_68bc155f59d08322b8efac9b2566443a
Summary by Sourcery
Introduce a minimal Rust toy application for end-to-end tests with CLI, man page generation, and accompanying tests
New Features:
Enhancements:
Documentation:
Tests: