Add installation script

.ci/install.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+OS=$(uname -a | cut -d" " -f 1)
+
+if [ "$OS" == "Darwin" ]; then
+  FILENAME="fnm-macos"
+elif [ "$OS" == "Linux" ]; then
+  FILENAME="fnm-linux"
+else
+  echo "OS $OS is not supported."
+  echo "If you think that's a bug - please file an issue to https://github.com/Schniz/fnm/issues"
+  exit 1
+fi
+
+get_latest_release() {
+  # Taken from https://gist.github.com/lukechilds/a83e1d7127b78fef38c2914c4ececc3c
+  curl --silent "https://api.github.com/repos/$1/releases/latest" | # Get latest release from GitHub api
+    grep '"tag_name":' |                                            # Get tag line
+    sed -E 's/.*"([^"]+)".*/\1/'                                    # Pluck JSON value
+}
+
+download_fnm() {
+  LATEST_RELEASE=$(get_latest_release Schniz/fnm)
+  URL=https://github.com/Schniz/fnm/releases/download/$LATEST_RELEASE/$FILENAME.zip
+  DOWNLOAD_DIR=$(mktemp -d -t fnm)
+
+  echo "Downloading $URL..."
+
+  mkdir -p $HOME/.fnm &> /dev/null
+  curl -L $URL -o $DOWNLOAD_DIR/$FILENAME.zip
+  unzip $DOWNLOAD_DIR/$FILENAME.zip -d $DOWNLOAD_DIR
+  mv $DOWNLOAD_DIR/$FILENAME/fnm $HOME/.fnm/fnm
+  chmod u+x $HOME/.fnm/fnm
+}
+
+setup_shell() {
+  CURRENT_SHELL=$(basename $SHELL)
+
+  if [ "$CURRENT_SHELL" == "zsh" ]; then
+    echo "Installing for Zsh. Appending the following to $HOME/.zshrc:"
+    echo 'export PATH=$HOME/.fnm:$PATH' >> $HOME/.zshrc
+    echo 'eval `fnm env`' >> $HOME/.zshrc
+  elif [ "$CURRENT_SHELL" == "fish" ]; then
+    echo 'Installation for Fish is WIP'
+    exit 1
+  elif [ "$CURRENT_SHELL" == "bash" ]; then
+    echo "Installing for Bash. Appending the following to $HOME/.bashrc:"
+    echo 'export PATH=$HOME/.fnm:$PATH'
+    echo 'eval `fnm env`'
+
+    echo 'export PATH=$HOME/.fnm:$PATH' >> $HOME/.bashrc
+    echo 'eval `fnm env`' >> $HOME/.bashrc
+  else
+    echo "Could not infer shell type. Please set up manually."
+    exit 1
+  fi
+}
+
+download_fnm
+setup_shell