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👋 Handy

deno module

Utility functions, classes, types, and scripts in uncompiled TS, for Deno.

array

Array-related utilities.

import { mapOnInterval } from "https://deno.land/x/handy/array/utils.ts";

mapOnInterval([3, 2, 1, "go!"], 1000, (item) => console.log(item));
// logs: 3
// 1sec later, logs: 2
// 1sec later, logs: 1
// 1sec later, logs: "go!"

cli

CLI-related utilities.

import { cmd } from "https://deno.land/x/handy/cli/utils.ts";

await cmd("echo Hello!"); // "Hello!"

collection

Utilities related to generic collection types, like Iterables.

import {
  largest,
  smallest,
} from "https://deno.land/x/handy/collection/utils.ts";

largest(["aaa", "b", "cc"]); // "aaa"
smallest(["aaa", "b", "cc"]); // "b"

largest("size", [new Set([1]), new Set([2, 3]), new Set()]); // new Set([2, 3])
smallest("size", [new Set([1]), new Set([2, 3]), new Set()]); // new Set()

fs

File system-related utilities.

import {
  findNearestFile,
  glob,
  globImport,
} from "https://deno.land/x/handy/fs/utils.ts";

await findNearestFile(".", "some.file"); // "../../some.file"
await glob("./**/*.ts"); // all TS files in cwd and subdirs

const modules = await globImport("./**/*.ts");

for (const [path, module] of Object.entries(modules)) {
  console.log(path); // something.ts
  const data = await module(); // import something.ts
}

git

Git-related utilities.

import { commit, tag } from "./git/utils.ts";

await tag.getLatest(); // ex. "v1.0.0"
await commit.get("c32f42c"); // { message: "chore: rename to handy", ... }
commit.conventional.parse("feat(scope)!: description"); // { type: "feat", ... }

script/makeReleaseNotes

For a git repo, scan the commit history for conventional commits since the last tag and generate a markdown-formatted list of features and fixes.

import { makeReleaseNotes } from "https://deno.land/x/handy/git/script/makeReleaseNotes.ts";

When run as a script, it will generate release notes for the repo in the current working directory. The directory can be overridden by the first argument, and the --to-clipboard flag will copy the release notes to the clipboard instead of printing them to stdout.

Usage:
  deno run -A https://deno.land/x/handy/git/script/makeReleaseNotes.ts [options] [path]

Options:
  -h, --help          Show this help message
  -c, --to-clipboard  Copy release notes to clipboard
  -v, --verbose       Print verbose output
  -g, --group-by-type Group commits by type using H2 headings
  --commit=<commit>   Commit to use as base for release notes
  --types=<types>     Comma-separated list of types to include
  --<type>=<name>     Name to use for a type's H2 when grouping by type

Examples:
  deno run -A https://deno.land/x/make_release_notes/mod.ts -cgv

  deno run -A https://deno.land/x/make_release_notes/mod.ts --commit v1.0.0

  deno run -A https://deno.land/x/make_release_notes/mod.ts \
    --types=feat,custom --custom="Custom Section Heading"

graph

Graph-related utilities.

import { DirectedGraph } from "https://deno.land/x/handy/graph/utils.ts";

const graph = new DirectedGraph()
  .add("a")
  .add("b", ["a", "c"]);

graph.vertices; // ["a", "b", "c"]
graph.edges; // [["b", "a"], ["b", "c"]]

io

Assorted I/O utilities which don’t fit in other categories.

import { clipboard } from "https://deno.land/x/handy/io/utils.ts";

clipboard.copy("foo");
clipboard.paste(); // "foo"

md

Markdown-related utilities.

import { codeBlock } from "https://deno.land/x/handy/md/utils.ts";

codeBlock.create("grep"); // "    grep"
codeBlock.create("const a: number = 1", { lang: "ts" });
codeBlock.parse("```ts\nconst a: number = 1\n```");
codeBlock.findAll("    grep\n```cd```"); // ["    grep", "```cd```"]
codeBlock.evaluate(
  codeBlock.create('console.log("Hello!")', { lang: "ts" }),
);

script/evalCodeBlocks

For a markdown file, execute each TS code block in the file. Useful for checking imports and examples in a readme.

import { evalCodeBlocks } from "https://deno.land/x/handy/md/script/evalCodeBlocks.ts";

When run as a script, it will execute the code blocks in the file specified by the first argument. The second and third arguments are optional, and are used to find and replace a string in the file before executing the code blocks.

deno run --allow-read --allow-run \
  https://deno.land/x/handy/scripts/evalCodeBlocks.ts \
  ./readme.md \
  "some string to find" "replacement string" # optional

object

Object-related utilities.

import { setNestedEntry } from "https://deno.land/x/handy/object/utils.ts";

const S = Symbol("symbol");
setNestedEntry({}, ["a", 10, S], "👋"); // { a: { 10: { [S]: "👋" } } }

path

Path-related utilities.

import { globRoot } from "https://deno.land/x/handy/path/utils.ts";

globRoot("a/b/*.ts"); // "a/b/"

string

String-related utilities.

import {
  dedent,
  indent,
  mostConsecutive,
  sequences,
  splitOn,
  splitOnFirst,
} from "https://deno.land/x/handy/string/utils.ts";

dedent("  a\n   b\n    c"); // "a\n b\n  c"
indent("a\nb\nc", 2); // "  a\n  b\n  c"
splitOnFirst("/", "a/b/c"); // ["a", "b/c"]
splitOn(3, "\n", "a\nb\nc\nd\ne"); // ["a", "b", "c", "d\ne"]
sequences("A", "ABAACA"); // ["A", "AA", "A"]
mostConsecutive("A", "ABAACA"); // 2

types

Utility types.

import {
  JsonArray,
  JsonObject,
  JsonPrimitive,
  JsonValue,
} from "https://deno.land/x/handy/types/json.ts";

const a: JsonPrimitive = "some string"; // or number, boolean, null
const b: JsonArray = [1, ["2", true], { a: null }];
const c: JsonObject = { a: 1, b: ["2", true], d: { e: null } };
// JsonValue = any of the above