Update install instructions to new domain

Install script location is now https://imdl.io/install.sh

type: distribution

README.md

@@ -34,9 +34,7 @@ MacOS or Windows, just replace `DEST` with the directory where you'd like to
 install the `imdl` binary:
 
 ```sh
-curl --proto '=https' --tlsv1.2 -sSf \
-  https://raw.githubusercontent.com/casey/intermodal/master/bin/install \
-  | bash -s -- --to DEST
+curl --proto '=https' --tlsv1.2 -sSf https://imdl.io/install.sh | bash -s -- --to DEST
 ```
 
 #### Cargo

docs/install.sh

@@ -0,0 +1,123 @@
+#!/usr/bin/env bash
+
+set -eu
+
+help() {
+  cat <<'EOF'
+Install a binary release of a imdl hosted on GitHub
+
+Usage:
+    install [options]
+
+Options:
+    -h, --help      Display this message
+    -f, --force     Force overwriting an existing binary
+    --tag TAG       Tag (version) of the crate to install (default <latest release>)
+    --to LOCATION   Where to install the binary (default ~/.cargo/bin)
+EOF
+}
+
+git=casey/intermodal
+crate=imdl
+url=https://github.com/casey/intermodal
+releases=$url/releases
+
+case `uname -s` in
+  Darwin) target=x86_64-apple-darwin;;
+  Linux)  target=x86_64-unknown-linux-musl;;
+  *)      target=x86_64-pc-windows-msvc;;
+esac
+
+say() {
+  echo "install: $1"
+}
+
+say_err() {
+  say "$1" >&2
+}
+
+err() {
+  if [ ! -z ${td-} ]; then
+    rm -rf $td
+  fi
+
+  say_err "ERROR $1"
+  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
+      ;;
+    --to)
+      dest=$2
+      shift
+      ;;
+    *)
+      ;;
+  esac
+  shift
+done
+
+# Dependencies
+need basename
+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 -s "$releases/latest" | cut -d'"' -f2 | rev | cut -d'/' -f1 | rev)
+fi
+
+archive="$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 -sL $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