Implement exercise 'armstrong-numbers'

config.json

@@ -108,6 +108,14 @@
         "prerequisites": [],
         "difficulty": 2
       },
+      {
+        "slug": "armstrong-numbers",
+        "name": "Armstrong Numbers",
+        "uuid": "d9beb726-00fe-4b2c-9a58-1cadcaa4f4b5",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "binary-search",
         "name": "Binary Search",

config.yaml

@@ -107,6 +107,13 @@ exercises:
     prerequisites: []
     difficulty: 2
 
+  - slug: armstrong-numbers
+    name: Armstrong Numbers
+    uuid: d9beb726-00fe-4b2c-9a58-1cadcaa4f4b5
+    practices: []
+    prerequisites: []
+    difficulty: 2
+
   - slug: binary-search
     name: Binary Search
     uuid: db284b8d-a06d-4a34-9f8a-6c78ef56ce26

exercises/practice/armstrong-numbers/.docs/instructions.md

@@ -0,0 +1,14 @@
+# Instructions
+
+An [Armstrong number][armstrong-number] is a number that is the sum of its own digits each raised to the power of the number of digits.
+
+For example:
+
+- 9 is an Armstrong number, because `9 = 9^1 = 9`
+- 10 is _not_ an Armstrong number, because `10 != 1^2 + 0^2 = 1`
+- 153 is an Armstrong number, because: `153 = 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153`
+- 154 is _not_ an Armstrong number, because: `154 != 1^3 + 5^3 + 4^3 = 1 + 125 + 64 = 190`
+
+Write some code to determine whether a number is an Armstrong number.
+
+[armstrong-number]: https://en.wikipedia.org/wiki/Narcissistic_number

exercises/practice/armstrong-numbers/.meta/.yamlscript/exercise.mk

@@ -0,0 +1 @@
+YS_VERSION := 0.1.75

exercises/practice/armstrong-numbers/.meta/Makefile

@@ -0,0 +1,28 @@
+SHELL := bash
+
+BASE := $(shell pwd)
+
+export YS_VERSION := 0.1.76
+
+YS_LOCAL_PREFIX := ../../../../.local/v$(YS_VERSION)
+
+YS_LOCAL_BIN := $(YS_LOCAL_PREFIX)/bin
+
+YS_BIN := $(YS_LOCAL_BIN)/ys-$(YS_VERSION)
+
+TEST_FILE ?= $(wildcard *-test.ys)
+
+
+export PATH := $(YS_LOCAL_BIN):$(PATH)
+
+export YSPATH := $(BASE)
+
+
+default:
+
+test: $(YS_BIN)
+	prove -v $(TEST_FILE)
+
+$(YS_BIN):
+	curl -s https://yamlscript.org/install | \
+	  BIN=1 VERSION=$(YS_VERSION) PREFIX=$(YS_LOCAL_PREFIX) bash >/dev/null

exercises/practice/armstrong-numbers/.meta/armstrong-numbers-test.ys

@@ -0,0 +1,53 @@
+#!/usr/bin/env ys-0
+
+require ys::taptest: :all
+
+use: armstrong-numbers
+
+test::
+- name: Zero is an armstrong number
+  code: is-armstrong-number(0)
+  want: true
+  uuid: c1ed103c-258d-45b2-be73-d8c6d9580c7b
+
+- name: Single-digit numbers are armstrong numbers
+  code: is-armstrong-number(5)
+  want: true
+  uuid: 579e8f03-9659-4b85-a1a2-d64350f6b17a
+
+- name: There are no two-digit armstrong numbers
+  code: is-armstrong-number(10)
+  want: false
+  uuid: 2d6db9dc-5bf8-4976-a90b-b2c2b9feba60
+
+- name: Three-digit number that is an armstrong number
+  code: is-armstrong-number(153)
+  want: true
+  uuid: 509c087f-e327-4113-a7d2-26a4e9d18283
+
+- name: Three-digit number that is not an armstrong number
+  code: is-armstrong-number(100)
+  want: false
+  uuid: 7154547d-c2ce-468d-b214-4cb953b870cf
+
+- name: Four-digit number that is an armstrong number
+  code: is-armstrong-number(9474)
+  want: true
+  uuid: 6bac5b7b-42e9-4ecb-a8b0-4832229aa103
+
+- name: Four-digit number that is not an armstrong number
+  code: is-armstrong-number(9475)
+  want: false
+  uuid: eed4b331-af80-45b5-a80b-19c9ea444b2e
+
+- name: Seven-digit number that is an armstrong number
+  code: is-armstrong-number(9926315)
+  want: true
+  uuid: f971ced7-8d68-4758-aea1-d4194900b864
+
+- name: Seven-digit number that is not an armstrong number
+  code: is-armstrong-number(9926314)
+  want: false
+  uuid: 7ee45d52-5d35-4fbd-b6f1-5c8cd8a67f18
+
+done: 9

exercises/practice/armstrong-numbers/.meta/armstrong-numbers.ys

@@ -0,0 +1,4 @@
+!yamlscript/v0
+
+defn is-armstrong-number(number):
+  number ==: map(\(_ ** str(number).#) digits(number)).sum()

exercises/practice/armstrong-numbers/.meta/config.json

@@ -0,0 +1,23 @@
+{
+  "authors": [
+    "ingydotnet"
+  ],
+  "files": {
+    "solution": [
+      "armstrong-numbers.ys"
+    ],
+    "test": [
+      "armstrong-numbers-test.ys",
+      "GNUmakefile",
+      "Makefile",
+      ".yamlscript/exercise.mk",
+      ".yamlscript/exercism-ys-installer"
+    ],
+    "example": [
+      ".meta/armstrong-numbers.ys"
+    ]
+  },
+  "blurb": "Determine if a number is an Armstrong number.",
+  "source": "Wikipedia",
+  "source_url": "https://en.wikipedia.org/wiki/Narcissistic_number"
+}

exercises/practice/armstrong-numbers/.meta/tests.toml

@@ -0,0 +1,43 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[c1ed103c-258d-45b2-be73-d8c6d9580c7b]
+description = "Zero is an Armstrong number"
+
+[579e8f03-9659-4b85-a1a2-d64350f6b17a]
+description = "Single-digit numbers are Armstrong numbers"
+
+[2d6db9dc-5bf8-4976-a90b-b2c2b9feba60]
+description = "There are no two-digit Armstrong numbers"
+
+[509c087f-e327-4113-a7d2-26a4e9d18283]
+description = "Three-digit number that is an Armstrong number"
+
+[7154547d-c2ce-468d-b214-4cb953b870cf]
+description = "Three-digit number that is not an Armstrong number"
+
+[6bac5b7b-42e9-4ecb-a8b0-4832229aa103]
+description = "Four-digit number that is an Armstrong number"
+
+[eed4b331-af80-45b5-a80b-19c9ea444b2e]
+description = "Four-digit number that is not an Armstrong number"
+
+[f971ced7-8d68-4758-aea1-d4194900b864]
+description = "Seven-digit number that is an Armstrong number"
+
+[7ee45d52-5d35-4fbd-b6f1-5c8cd8a67f18]
+description = "Seven-digit number that is not an Armstrong number"
+
+[5ee2fdf8-334e-4a46-bb8d-e5c19c02c148]
+description = "Armstrong number containing seven zeroes"
+
+[12ffbf10-307a-434e-b4ad-c925680e1dd4]
+description = "The largest and last Armstrong number"

exercises/practice/armstrong-numbers/.yamlscript/exercise.mk

@@ -0,0 +1 @@
+YS_VERSION := 0.1.75

exercises/practice/armstrong-numbers/.yamlscript/exercism-ys-installer

@@ -0,0 +1,127 @@
+#!/env/bin/env bash
+
+set -euo pipefail
+
+intro-prompt() (
+  cat <<...
+--------------------------------------------------------------------------------
+
+This YAMLScript Exercism exercise requires the YAMLScript version $version
+interpreter command file to be installed here:
+
+  $prefix/bin/ys
+
+You can install it by pressing Enter now, or by running this command:
+
+  $make install-ys
+
+This should only take a few seconds and you only need to do this once.
+Other exercises will use the same file.
+
+See https://yamlscript.org/doc/install/ for more YAMLScript installation info.
+
+--------------------------------------------------------------------------------
+
+Would you like to install the 'ys' file now?
+
+...
+
+  printf "Press Enter to install. Ctl-C to Quit."; read -r
+)
+
+main() {
+  setup "$@"
+
+  install-from-local
+
+  $auto && intro-prompt
+
+  installed || install-from-release || true
+  installed || install-from-build || true
+  installed ||
+    die "Installing '$installed' failed. Giving up." \
+        "Consider filing an issue at: $gh_issue_url"
+
+  echo
+  echo 'Success!'
+  echo "$installed is now installed."
+  echo
+}
+
+installed() {
+  [[ -f $installed ]]
+}
+
+install-from-local() {
+  local path
+  path=$(command -v "$ysfq") || true
+  if [[ -f $path ]]; then
+    mkdir -p "$bin"
+    cp "$path" "$bin"/
+    ln -fs "$ysfq" "$bin/ys-0"
+    ln -fs "$ysfq" "$bin/ys"
+    (installed && $auto) && exit
+    true
+  fi
+}
+
+install-from-release() (
+  set -x
+  curl -s https://yamlscript.org/install |
+    BIN=1 VERSION="$version" PREFIX="$prefix" bash
+)
+
+install-from-build() (
+  cat <<...
+
+The binary release installation failed.
+We can attempt to build and install $ysfq now.
+This can take from 1 to 5 minutes to complete.
+
+...
+
+  printf "Press Enter to install. Ctl-C to Quit."; read -r
+
+  [[ -d /tmp && -w /tmp ]] ||
+    die "Can't write to /tmp" \
+        'Giving up.'
+
+  set -x
+
+  rm -fr "$yamlscript_clone"
+
+  git clone --branch="$version" "$yamlscript_repo" "$yamlscript_clone"
+
+  "$make" -C "$yamlscript_clone/ys" install PREFIX="$prefix"
+)
+
+setup() {
+  version=$1
+  prefix=$2
+  make=$3
+  auto=false
+  [[ ${4-} ]] && auto=true
+
+  [[ $version =~ ^0\.1\.[0-9]+$ ]] ||
+    die "Invalid YS_VERSION '$version'"
+
+  bin=$prefix/bin
+  ysfq=ys-$version
+  installed=$bin/$ysfq
+
+  if installed; then
+    echo "'$installed' is already installed."
+    exit
+  fi
+
+  yamlscript_repo=https://github.com/yaml/yamlscript
+  yamlscript_clone=/tmp/yamlscript-exercism
+  gh_issue_url=https://github.com/exercism/yamlscript/issues
+}
+
+die() {
+  printf '%s\n' "$@" >&2
+  exit 1
+}
+
+main "$@"

exercises/practice/armstrong-numbers/GNUmakefile

@@ -0,0 +1,49 @@
+SHELL := bash
+
+BASE := $(shell pwd)
+
+include .yamlscript/exercise.mk
+
+YS_LOCAL_PREFIX := ../../../.local/v$(YS_VERSION)
+ifeq (,$(shell [[ -d "$(YS_LOCAL_PREFIX)" ]] && echo ok))
+YS_LOCAL_PREFIX := $(shell cd .. && pwd -P)/.local/v$(YS_VERSION)
+endif
+
+YS_LOCAL_BIN := $(YS_LOCAL_PREFIX)/bin
+YS_BIN := $(YS_LOCAL_BIN)/ys-$(YS_VERSION)
+
+YS_INSTALLER := .yamlscript/exercism-ys-installer
+YS_INSTALLER_CMD := \
+  bash $(YS_INSTALLER) $(YS_VERSION) $(YS_LOCAL_PREFIX) $(MAKE)
+
+TEST_FILE ?= $(wildcard *-test.ys)
+
+export PATH := $(YS_LOCAL_BIN):$(PATH)
+export YSPATH := $(BASE)
+
+
+#-------------------------------------------------------------------------------
+default:
+	@echo " No default make rule. Try 'make test'."
+
+test: $(YS_BIN)
+	prove -v $(TEST_FILE)
+
+install-ys:
+	@$(YS_INSTALLER_CMD)
+
+uninstall-ys:
+	rm -fr $(YS_LOCAL_PREFIX)
+
+
+#-------------------------------------------------------------------------------
+ifdef EXERCISM_YAMLSCRIPT_GHA
+$(YS_BIN):
+
+else ifeq (/mnt/,$(dir $(BASE)))
+$(YS_BIN):
+
+else
+$(YS_BIN):
+	@$(YS_INSTALLER_CMD) auto
+endif

exercises/practice/armstrong-numbers/Makefile

@@ -0,0 +1,8 @@
+# This Makefile is a decoy to attempt to detect when a non-GNU make is being
+# used and alert the user.
+
+test:
+	@echo "You appear to be using a non-GNU version of the 'make' program."
+	@echo "The YAMLScript Exercism track requires you to use GNU make."
+	@echo "Please try 'make $@' again using GNU make."
+	@exit 1