Add get script

Signed-off-by: Richard Gee <richard@technologee.co.uk>

README.md

@@ -1,17 +1,27 @@
 # snowmachine
 
-A Go port of the python script by (John Anderson)[https://github.com/sontek/snowmachine] that brings a little festive cheer to your terminal. View it in action here:
+A Go port of the python script by [John Anderson](https://github.com/sontek/snowmachine) that brings a little festive cheer to your terminal. View it in action here:
 
 ![Rainbow ascii tree with snowfall](./images/animatedtree.gif)
 
+## Installation
 
+### Linux / MacOs
 
-Getting Started
+```sh
+curl -sLS https://raw.githubusercontent.com/rgee0/snowmachine/main/get.sh | sudo sh
+```
+
+## Getting Started
 ---------------
 You can make it snow:
 
 ```bash
 $ snowmachine snow
+
+or using the alias `sm`
+
+$ sm snow
 ```
 ![Example of snow command](./images/snow.png)
 

get.sh

@@ -0,0 +1,185 @@
+#!/usr/bin/env bash
+
+export VERIFY_CHECKSUM=0
+export ALIAS_NAME="sm"
+export OWNER=rgee0
+export REPO=snowmachine
+export BINLOCATION="/usr/local/bin"
+
+###############################
+# Content common across repos #
+###############################
+
+version=$(curl -sI https://github.com/$OWNER/$REPO/releases/latest | grep -i "location:" | awk -F"/" '{ printf "%s", $NF }' | tr -d '\r')
+if [ ! $version ]; then
+    echo "Failed while attempting to install $REPO. Please manually install:"
+    echo ""
+    echo "1. Open your web browser and go to https://github.com/$OWNER/$REPO/releases"
+    echo "2. Download the latest release for your platform. Call it '$REPO'."
+    echo "3. chmod +x ./$REPO"
+    echo "4. mv ./$REPO $BINLOCATION"
+    if [ -n "$ALIAS_NAME" ]; then
+        echo "5. ln -sf $BINLOCATION/$REPO /usr/local/bin/$ALIAS_NAME"
+    fi
+    exit 1
+fi
+
+hasCli() {
+
+    hasCurl=$(which curl)
+    if [ "$?" = "1" ]; then
+        echo "You need curl to use this script."
+        exit 1
+    fi
+}
+
+checkHash(){
+
+    sha_cmd="sha256sum"
+
+    if [ ! -x "$(command -v $sha_cmd)" ]; then
+    sha_cmd="shasum -a 256"
+    fi
+
+    if [ -x "$(command -v $sha_cmd)" ]; then
+
+    targetFileDir=${targetFile%/*}
+
+    (cd "$targetFileDir" && curl -sSL $url.sha256|$sha_cmd -c >/dev/null)
+
+        if [ "$?" != "0" ]; then
+            rm "$targetFile"
+            echo "Binary checksum didn't match. Exiting"
+            exit 1
+        fi
+    fi
+}
+
+getPackage() {
+    uname=$(uname)
+    userid=$(id -u)
+
+    suffix=""
+    case $uname in
+    "Darwin")
+        arch=$(uname -m)
+        case $arch in
+        "x86_64")
+        suffix="-darwin"
+        ;;
+        esac
+        case $arch in
+        "arm64")
+        suffix="-darwin-arm64"
+        ;;
+        esac
+    ;;
+
+    "MINGW"*)
+    suffix=".exe"
+    BINLOCATION="$HOME/bin"
+    mkdir -p $BINLOCATION
+
+    ;;
+    "Linux")
+        arch=$(uname -m)
+        echo $arch
+        case $arch in
+        "aarch64")
+        suffix="-arm64"
+        ;;
+        esac
+        case $arch in
+        "armv6l" | "armv7l")
+        suffix="-armhf"
+        ;;
+        esac
+    ;;
+    esac
+
+    targetFile="/tmp/$REPO$suffix"
+
+    if [ "$userid" != "0" ]; then
+        targetFile="$(pwd)/$REPO$suffix"
+    fi
+
+    if [ -e "$targetFile" ]; then
+        rm "$targetFile"
+    fi
+
+    url=https://github.com/$OWNER/$REPO/releases/download/$version/$REPO$suffix
+    echo "Downloading package $url as $targetFile"
+
+    curl -sSL $url --output "$targetFile"
+
+    if [ "$?" = "0" ]; then
+
+        if [ "$VERIFY_CHECKSUM" = "1" ]; then
+            checkHash
+        fi
+
+    chmod +x "$targetFile"
+
+    echo "Download complete."
+
+    if [ ! -w "$BINLOCATION" ]; then
+
+            echo
+            echo "============================================================"
+            echo "  The script was run as a user who is unable to write"
+            echo "  to $BINLOCATION. To complete the installation the"
+            echo "  following commands may need to be run manually."
+            echo "============================================================"
+            echo
+            echo "  sudo cp $REPO$suffix $BINLOCATION/$REPO"
+
+            if [ -n "$ALIAS_NAME" ]; then
+                echo "  sudo ln -sf $BINLOCATION/$REPO $BINLOCATION/$ALIAS_NAME"
+            fi
+
+            echo
+
+        else
+
+            echo
+            echo "Running with sufficient permissions to attempt to move $REPO to $BINLOCATION"
+
+            if [ ! -w "$BINLOCATION/$REPO" ] && [ -f "$BINLOCATION/$REPO" ]; then
+
+            echo
+            echo "================================================================"
+            echo "  $BINLOCATION/$REPO already exists and is not writeable"
+            echo "  by the current user.  Please adjust the binary ownership"
+            echo "  or run sh/bash with sudo."
+            echo "================================================================"
+            echo
+            exit 1
+
+            fi
+
+            mv "$targetFile" $BINLOCATION/$REPO
+
+            if [ "$?" = "0" ]; then
+                echo "New version of $REPO installed to $BINLOCATION"
+            fi
+
+            if [ -e "$targetFile" ]; then
+                rm "$targetFile"
+            fi
+
+            if [ $(which $ALIAS_NAME) ]; then
+                echo "There is already a command '$ALIAS_NAME' in the path, NOT creating alias"
+            else
+                if [ -n "$ALIAS_NAME" ]; then
+                    if [ ! -L $BINLOCATION/$ALIAS_NAME ]; then
+                        ln -s $BINLOCATION/$REPO $BINLOCATION/$ALIAS_NAME
+                        echo "Creating alias '$ALIAS_NAME' for '$REPO'."
+                    fi
+                fi
+            fi
+        fi
+    fi
+}
+
+hasCli
+getPackage