setup devcontainer

Author: mlinksva

.devcontainer/devcontainer.json

@@ -0,0 +1,4 @@
+{
+  "name": "choosealicense.com",
+  "postCreateCommand": "bash .devcontainer/post-create.sh"
+}

.devcontainer/post-create.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if ! command -v curl >/dev/null 2>&1; then
+  echo "curl is required to fetch GitHub Pages versions metadata"
+  exit 1
+fi
+
+if ! command -v ruby >/dev/null 2>&1; then
+  echo "ruby is required to parse GitHub Pages versions metadata"
+  exit 1
+fi
+
+pages_ruby_version="$({
+  curl -fsSL https://pages.github.com/versions.json
+} | ruby -rjson -e 'print JSON.parse(STDIN.read).fetch("ruby")')"
+
+if [[ -z "${pages_ruby_version}" ]]; then
+  echo "Could not determine Ruby version from https://pages.github.com/versions.json"
+  exit 1
+fi
+
+echo "GitHub Pages Ruby version: ${pages_ruby_version}"
+
+if ! command -v git >/dev/null 2>&1; then
+  echo "git is required to initialize submodules"
+  exit 1
+fi
+
+echo "Initializing/updating git submodules"
+git submodule update --init --recursive
+
+# RVM scripts can reference internal variables before they are initialized,
+# which fails under `set -u` (for example: `_system_name: unbound variable`).
+# Temporarily disable nounset while sourcing and invoking RVM.
+nounset_was_set=0
+if [[ $- == *u* ]]; then
+  nounset_was_set=1
+  set +u
+fi
+
+if [[ -s /usr/local/rvm/scripts/rvm ]]; then
+  source /usr/local/rvm/scripts/rvm
+elif [[ -s "$HOME/.rvm/scripts/rvm" ]]; then
+  source "$HOME/.rvm/scripts/rvm"
+else
+  echo "RVM was not found; unable to auto-install Ruby ${pages_ruby_version}"
+  exit 1
+fi
+
+rvm install "${pages_ruby_version}" --quiet-curl
+rvm use "${pages_ruby_version}"
+rvm alias create default "${pages_ruby_version}"
+
+if [[ "${nounset_was_set}" -eq 1 ]]; then
+  set -u
+fi
+
+gem install bundler --no-document
+bundle install