Installer, closes #3

docs/installer.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# Let's grab the latest release
+OS="linux"
+
+if [[ "$OSTYPE" == "darwin" ]]; then
+        OS="darwin"
+elif [[ "$OSTYPE" == "cygwin"* ]]; then
+        OS="windows"
+elif [[ "$OSTYPE" == "win32" ]]; then
+        OS="windows"
+elif [[ "$OSTYPE" == "msys" ]]; then
+        OS="windows"
+elif [[ "$OSTYPE" == "freebsd"* ]]; then
+        OS="freebds"
+fi
+
+ARCH="386"
+MACHINE_TYPE=`uname -m`
+if [ ${MACHINE_TYPE} == 'x86_64' ]; then
+  ARCH="amd64"
+fi
+
+echo "Trying to detect the details of your architecture."
+echo ""
+echo "If these don't seem correct, head over to https://github.com/abs-lang/abs/releases"
+echo "and download the right binary for your architecture."
+echo ""
+echo "OS: $OS"
+echo "ARCH: $ARCH"
+echo ""
+echo "Are these correct? [y/N]"
+
+while read line
+do
+  INPUT=$(echo $line | awk '{print toupper($0)}')
+  if [[ $INPUT == "Y" ]]; then
+    break;
+  fi
+  if [[ $INPUT == "YES" ]]; then
+    break;
+  fi
+  echo Exited
+  exit 1
+done < "/dev/stdin"
+
+INSTALLER_PATH=$(dirname $(mktemp -u))
+BIN=abs-preview-0-$OS-amd64
+cd $INSTALLER_PATH && \
+wget https://github.com/abs-lang/abs/releases/download/preview-0/$BIN && \
+chmod +x $BIN && \
+mv $BIN /usr/local/bin/abs && \
+echo "installation completed"