YAMLScript Cheat Sheet

load.yaml

#! /usr/bin/env ys-0
!yamlscript/v0/data

# https://eemeli.org/yaml#yaml
# https://npm.im/@yaml/yamlscript
# https://yamlscript.org/doc/cheat
# https://yamlscript.org/doc/core
# https://yamlscript.org/doc/ys-std

# ys --yaml */load.ys #--json
# tail -n+2 < */load.ys | pnpx yaml --single --json --indent ${TABSIZE-2}

# Convert
object: &object
  a: 1
  b: 2
  c: 3
keys::   &keys  keys(*object) # a–c
values:: &array vals(*object) # 1–3
object->entries:: &entries into([] *object) # [[a, 1], [b, 2], [c, 3]]
entries->object:: omap(*entries) # a: 1, b: 2 c: 3

# Map
map:: map(inc *array) # 2–4
map-object:: map((fn [[k, v]] [k inc(v)]) *object):omap # a: 1, b: 2 c: 3

# Filter
filter:: filter(even? *array) # 2
filter-object:: dissoc(*object "b") # a: 1, c: 3
grep:: grep((has? ["b"]) *keys) # b

# Reduce
add: &add [4, 5]
total:: reduce(+ *add) # 9

# Merge
extend:
  <<: *object
  d: 4
merge:: merge(*object { :d 4 }) # a: 1, b: 2, c: 3, d: 4
concat:: concat(*array *add) # 1–5

# Flatten
nested: &nested [0, *array]
flatten:: flatten(*nested) # 0–3

# Paths
pwd:: CWD.replace(ENV.HOME, "~") # ~/path/to/load.ys
glob::      fs-glob("*") # []
dirname::   fs-dirname(FILE) # ~/path/to
basename::  fs-filename(FILE) # load.ys
filename::  fs-filename(FILE):fs/strip-ext # load
extension:: fs/split-ext(FILE):last # ys

# Define
repository:
- &owner  semver
- &repo   semver
- &branch master #main

# Interpolation
repo =: &repository "$(*owner)/$(*repo)"
url  =: &url "https://raw.githubusercontent.com/$(*repository)/refs/heads/$(*branch)"

# Fetch Data
fetch =: json/load(curl("$(*url)/package.json"))
name:: fetch.name # semver-spec

# Fetch Line(s)
markdown =: slurp("$(*url)/semver.md") #?plain=1#L7-L15
summary:: markdown.lines().subvec(6 16).join("\n")
pattern:: markdown.lines().nth(356)

# Recursive
this =: yaml/load(slurp(FILE).lines().drop(3).join("\n"))
recursive:: this.nested:first # 0