Crate helpers4 

General-purpose helpers, one module per category.

Module and function names may overlap across modules (array::compact and object::compact are different functions); import through the module path, e.g. helpers4::string::capitalize.

Modules

animation

Animation timing without a framework: Easing curves (the CSS keywords, cubic-bezier(), steps() and linear(), read from a CSS string or built directly), physical Springs with their settling time, and to_css_linear to turn any curve into a CSS linear().

ansi

ANSI escape sequences: remove them from captured output and build styled text.

array

Helpers for slices and Vecs that the standard library does not provide.

bytes

Helpers for byte slices and sizes that the standard library does not provide.

cache

Caches and stores: entries that expire with a passed-in clock (ExpiringMap), and a capacity-bounded map that evicts by recency instead (LruCache). Neither ever reads a clock or the system allocator’s notion of “recent” behind the caller’s back.

ci

Detecting CI environments and reporting pipeline status.

color

Colors without a dependency: parsing, hex, CSS output, HSL, alpha, blending and WCAG contrast.

commit

Conventional Commits: parse a message, decide the version bump, validate.

date

Calendar dates without time zones: validation, ISO 8601 text, weekdays and day arithmetic.

duration

Parsing and formatting of durations as short human-readable strings (1h30m).

env

Dotenv (.env) helpers working on plain text: no file or process-environment access, so they are deterministic and easy to test. Read the file yourself, edit the content here, and write it back.

fs

File-system helpers: safe writes, missing-file-as-None, listing and path checks.

function

Helpers around functions: composition, memoization, retrying and rate limiting.

future

Runtime-neutral helpers for Futures, built on the standard library only.

geometry

2D geometry in f64: Point, Rect and the affine Matrix, in the layout of CSS and SVG matrix(a b c d e f).

hex

Byte/text encodings with typed errors: hexadecimal, and base64/base32 (RFC 4648).

http

HTTP header value helpers on plain text: no dependency on an HTTP crate.

id

Unique identifiers without the uuid or ulid crates: Uuid (v4 random, v7 sortable by time), Ulid, and short URL-safe ids over an Alphabet.

iter

Helpers for any Iterator, not only slices: work on a lazy, single-use or unbounded source.

license

SPDX license identifiers and expressions: look a license up, parse MIT OR Apache-2.0, check it against a policy, write a source header.

map

Helpers for HashMap that the standard library does not provide.

markdown

Helpers for writing Markdown safely: escaping, links, code, quotes, tables and heading anchors.

net

Network helpers on std::net and plain text: no I/O, no resolution.

number

Numeric helpers that the standard library does not provide.

random

Randomness without a hidden global generator.

secret

Keeping secrets out of logs: a wrapper that never prints its value, redaction, masking and credential detection.

set

Helpers for HashSet that the standard library does not provide.

string

String manipulation and formatting helpers.

time

Time helpers. Reading the clock is explicit and fallible: a clock set before 1970 is an error, not 0.

url

URLs without a dependency: percent-encoding, query strings, a parser and reference resolution.

validate

Shape checks for common user-facing formats: pragmatic subsets that catch real mistakes, not full grammars. None of them normalizes or parses the value, only checks it.

version

Semantic Versioning 2.0.0: parsing, precedence, bumps and Cargo-style requirements.