fix(cli): keep long entries from widening help columns - #1293
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📝 WalkthroughWalkthroughHelp rendering now caps usage columns for bounded terminals. Entries wider than the shared column use block layout. Library and argv renderers propagate terminal width through flattened help. Tests cover long flags, nested commands, and wrapped descriptions. ChangesHelp Column Layout
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to Very narrow help pages can still exceed their configured width when a long entry moves into block layout, causing visibly misformatted output. The change is localized and otherwise mergeable, with owner follow-up needed for this bounded layout issue. Sequence Diagram(s)sequenceDiagram
participant CLI
participant ArgvHelpRenderer
participant DocsRenderer
participant HelpLayout
CLI->>ArgvHelpRenderer: request bounded help
ArgvHelpRenderer->>HelpLayout: calculate capped usage columns
DocsRenderer->>HelpLayout: calculate capped usage columns
HelpLayout-->>ArgvHelpRenderer: return block or inline layout
HelpLayout-->>DocsRenderer: return block or inline layout
ArgvHelpRenderer-->>CLI: render wrapped help
DocsRenderer-->>CLI: render wrapped help
Poem
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Inline comments:
In `@argv/src/help.rs`:
- Line 1172: Update flatten_help and the flat_commands_short/flat_commands_long
renderers to accept the terminal width, calculate columns through
usage_column_width, and apply the same block-layout behavior in both paths.
Ensure padded flattened rows use the capped column width so nested arguments or
flags cannot widen bounded help output.
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argv/src/help.rsconformance/tests/metadata.rslib/src/docs/cli/mod.rslib/src/docs/layout.rs
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Instruction counts
1 benchmark(s) above the 1% gate: Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run. Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes. Shadow comparisonParsing
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Inline comments:
In `@argv/src/help.rs`:
- Around line 1519-1525: Wrap flattened short block descriptions to remain
within the terminal width: in argv/src/help.rs lines 1519-1525 and 1574-1580,
use write_wrapped_block for overflowed arguments and flags; in
lib/src/docs/cli/templates/spec_template_short.tera lines 159-160 and 184-185,
render the pre-wrapped arg.row and flag.row values. Add a flattened short-help
test with a description wider than terminal_width - 4.
In `@lib/src/docs/models.rs`:
- Around line 672-673: Update the flattened-subcommand rendering flow around
usage_column_width so every flattened descendant argument and flag is re-laid
out using the current parent page width before rendering, rather than its own
term_width. Preserve existing behavior for non-flattened entries, and add a
parity test covering a bounded flattened parent with an explicitly unbounded
child.
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argv/src/help.rsconformance/tests/metadata.rslib/src/docs/cli/mod.rslib/src/docs/cli/templates/spec_template_long.teralib/src/docs/cli/templates/spec_template_short.teralib/src/docs/layout.rslib/src/docs/models.rsusage-rs/tests/facade.rs
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Inline comments:
In `@argv/src/help.rs`:
- Around line 1521-1528: Separate the overflow handling from the
meta.next_line_help branch in the help rendering flow: overflow should build the
normal short-help row with inline annotations, preserve explicit multiline help,
and wrap only a single-line overflowing row instead of calling
write_wrapped_block unconditionally. Keep next-line rendering unchanged, and add
flattened short-help parity tests covering annotations and multiline help.
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argv/src/help.rsconformance/tests/metadata.rslib/src/docs/cli/mod.rslib/src/docs/cli/templates/spec_template_long.teralib/src/docs/cli/templates/spec_template_short.terausage-rs/tests/facade.rs
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Inline comments:
In `@argv/src/help.rs`:
- Around line 2318-2321: Remove the room >= 10 condition from the overflow
branch around write_wrapped_block, while preserving the overflow, next_line, and
single-line help checks. Ensure narrow fixed-width pages route overflow
descriptions through write_wrapped_block instead of write_indented, keeping
output within the configured width.
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argv/src/help.rsconformance/tests/metadata.rslib/src/docs/cli/mod.rs
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The latest perf run reports a gated markdown regression: 338,540,358 → 342,442,094 instructions (+1.15%); startup improves from 885,337 → 880,642 (-0.53%). The implementation does add help-layout work to the markdown model conversion path, so this needs an explicit decision between accepting the cost or optimizing it further. This comment was generated by Codex. |
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Summary
This prevents a single long flag, such as
--report-unused-disable-directives-severity <SEVERITY>in oxc, from forcing every flag on an 80-column page into block layout. Explicitly unbounded help retains its natural column width.Tests
cargo test --all --all-featurescargo clippy --all --all-features -- -D warningscargo fmt --all -- --checkNote
Medium Risk
Help layout is user-visible and must stay byte-aligned across three renderers; a mismatch would change
--helpoutput for many CLIs, but this is presentation-only with no parse or security impact.Overview
Caps the aligned usage column in CLI help so one long flag, argument, or command name cannot squeeze every description on the page.
Usage names now take at most two fifths of the width left after indent. Entries that exceed that cap drop into a wrapped block under their own spelling; shorter neighbors keep a readable two-column layout. Unbounded pages (
term_width = 0) still use the natural column.The same rule is applied in the zero-allocation argv renderer, the Go renderer, and the portable docs templates, including flattened nested help. Short-help flattened rows now go through the shared
entrypath so wrapping and annotations stay in parity.Reviewed by Cursor Bugbot for commit 71d3693. Bugbot is set up for automated code reviews on this repo. Configure here.
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