Add install script (#940)

install.sh

@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [ ! -z ${GITHUB_ACTIONS-} ]; then
+  set -x
+fi
+
+help() {
+  cat <<'EOF'
+Install a binary release of ord hosted on GitHub
+
+USAGE:
+    install [options]
+
+FLAGS:
+    -h, --help      Display this message
+    -f, --force     Force overwriting an existing binary
+
+OPTIONS:
+    --tag TAG       Tag (version) of the crate to install, defaults to latest release
+    --to LOCATION   Where to install the binary [default: ~/.cargo/bin]
+    --target TARGET
+EOF
+}
+
+git=casey/ord
+crate=ord
+url=https://github.com/casey/ord
+releases=$url/releases
+
+say() {
+  echo "install: $@"
+}
+
+say_err() {
+  say "$@" >&2
+}
+
+err() {
+  if [ ! -z ${td-} ]; then
+    rm -rf $td
+  fi
+
+  say_err "error: $@"
+  exit 1
+}
+
+need() {
+  if ! command -v $1 > /dev/null 2>&1; then
+    err "need $1 (command not found)"
+  fi
+}
+
+force=false
+while test $# -gt 0; do
+  case $1 in
+    --force | -f)
+      force=true
+      ;;
+    --help | -h)
+      help
+      exit 0
+      ;;
+    --tag)
+      tag=$2
+      shift
+      ;;
+    --target)
+      target=$2
+      shift
+      ;;
+    --to)
+      dest=$2
+      shift
+      ;;
+    *)
+      ;;
+  esac
+  shift
+done
+
+# Dependencies
+need curl
+need install
+need mkdir
+need mktemp
+need tar
+
+# Optional dependencies
+if [ -z ${tag-} ]; then
+  need cut
+  need rev
+fi
+
+if [ -z ${dest-} ]; then
+  dest="$HOME/.cargo/bin"
+fi
+
+if [ -z ${tag-} ]; then
+  tag=$(curl --proto =https --tlsv1.2 -sSf https://api.github.com/repos/casey/ord/releases/latest |
+    grep tag_name |
+    cut -d'"' -f4
+  )
+fi
+
+if [ -z ${target-} ]; then
+  uname_target=`uname -m`-`uname -s`
+
+  case $uname_target in
+    aarch64-Linux)     target=aarch64-unknown-linux-musl;;
+    arm64-Darwin)      target=aarch64-apple-darwin;;
+    x86_64-Darwin)     target=x86_64-apple-darwin;;
+    x86_64-Linux)      target=x86_64-unknown-linux-musl;;
+    x86_64-Windows_NT) target=x86_64-pc-windows-msvc;;
+    *)
+      err 'Could not determine target from output of `uname -m`-`uname -s`, please use `--target`:' $uname_target
+    ;;
+  esac
+fi
+
+archive="$releases/download/$tag/$crate-$tag-$target.tar.gz"
+
+say_err "Repository:  $url"
+say_err "Crate:       $crate"
+say_err "Tag:         $tag"
+say_err "Target:      $target"
+say_err "Destination: $dest"
+say_err "Archive:     $archive"
+
+td=$(mktemp -d || mktemp -d -t tmp)
+curl --proto =https --tlsv1.2 -sSfL $archive | tar -C $td -xz
+
+for f in $(ls $td); do
+  test -x $td/$f || continue
+
+  if [ -e "$dest/$f" ] && [ $force = false ]; then
+    err "$f already exists in $dest"
+  else
+    mkdir -p $dest
+    install -m 755 $td/$f $dest
+  fi
+done
+
+rm -rf $td