fix(help): Provide better commands heading for styling #12593
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In working on rust-lang#12578, I felt it would be weird to style the entire statement about commands but it also felt weird to not style it. So this change explores an alternatively way of communicating the information.
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r? @ehuss (rustbot has picked a reviewer for you, use r? to override) |
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Both the current and the proposed change look fine to me. I'm curious where it's going with the changed styling. Screenshots may help. |
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#12578 has screenshots if you expand "details". It doesn't include this change but I'm hopeful that makes the intent clear. |
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Seems fine to me, thanks! @bors r+ |
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☀️ Test successful - checks-actions |
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Update cargo 21 commits in 96fe1c9e1aecd8f57063e3753969bb6418fd2fd5..d14c85f4e6e7671673b1a1bc87231ff7164761e1 2023-08-29 20:10:34 +0000 to 2023-09-05 22:28:10 +0000 - fix(resolver): Make resolver behavior independent of package order (rust-lang/cargo#12602) - cargo-credential: change serialization of cache expiration (rust-lang/cargo#12622) - Update registry-web-api.md yank/unyank comments (rust-lang/cargo#12619) - test: new options of debuginfo are no longer unstable (rust-lang/cargo#12618) - use split_once for cleaner code (rust-lang/cargo#12615) - stop using lazy_static (rust-lang/cargo#12616) - doc: adjust all doc headings one level up (rust-lang/cargo#12595) - chore(deps): update compatible (rust-lang/cargo#12609) - chore(deps): update rust crate cargo_metadata to 0.17.0 (rust-lang/cargo#12610) - Prepare for partial-version package specs (rust-lang/cargo#12591) - refactor: Use more serde_untagged (rust-lang/cargo#12581) - fix(cli): Help users know possible `--target` values (rust-lang/cargo#12607) - Tab completion for --target uses rustup but fallsback to rustc (rust-lang/cargo#12606) - Fewer temporary needless strings (rust-lang/cargo#12604) - fix(help): Provide better commands heading for styling (rust-lang/cargo#12593) - fix(update): Clarify meaning of --aggressive as --recursive (rust-lang/cargo#12544) - docs(changelog): Clarify language for Cargo.lock policy (rust-lang/cargo#12601) - fix typo: "default branch branch" -> "default branch" (rust-lang/cargo#12598) - fix: add error for unsupported credential provider version (rust-lang/cargo#12590) - fix(help): Explain --explain (rust-lang/cargo#12592) - fix(help): Remove redundant information from new/init (rust-lang/cargo#12594) r? ghost
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feat(help): Add styling to help output ### What does this PR try to resolve? Try to make `--help` output easier to parse by using terminal styling Screenshots:    *(`nargo` is my shell script wrapping `cargo run --manifest-path cargo/Cargo.toml`)* ### How should we test and review this PR? At this time, the only styling snapshotting library I know of is a pain to use, so testing this requires manually running the commands which I did. Screenshots are included for easier evaluation of the general idea. Snapshotting of the plain text output ensures we don't have accidental formatting regressions from this change since the formatting isn't as obvious from looking at the code. ### Additional information Traditionally, cargo has disabled clap's styled output. My assumed reason is that cargo mixes custom help output with auto-generated and you couldn't previously make it all styled. Clap 4.2 allowed users to pass in strings styled using ANSI escape codes, allowing us to pass in styled text that matches clap, unblocking this. In clap 4.4.1, clap gained the ability for the user to override the style. In this PR, I decided to use the new 4.4.1 feature to style clap's output to match the rest of cargo's output. Alternatively, we could use a more subdue style that clap uses by default. I used the `color-print` crate to allow something almost html-like for styling `&static str`. Alternatively, we could directly embed the ANSI escape codes harder to get write, harder to inspect), or we could do the styling at runtime and enable the `string` feature in clap. I decided to *not* style `Arg::help` messages because - It might be distracting to have the descriptions lit up like a christmas tree - It is a lot more work The one exception I made was for `--list` since it is for a psuedo-command (`...`) and I wanted to intentionally draw attention to it. #12593 made styling of `cargo -h` cleaner imo. #12592 and #12594 were improvements I noticed while doing this.
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In working on #12578, I felt it would be weird to style the entire statement about commands but it also felt weird to not style it. So this change explores an alternatively way of communicating the information.