initial commit with tested on OS X script 10.10.2 Yosemite

Makefile

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+install:
+	[ ! -d /usr/local/bin/ ] && mkdir -p /usr/local/bin
+	cp createRAMDiskandMoveCaches.sh /usr/local/bin/
+	cp ./OSXRamDisk.plist ~/Library/LaunchAgents/
+	[ -f ~/Library/LaunchAgents/OSXRamDisk.plist ] && launchctl load -w ~/Library/LaunchAgents/OSXRamDisk.plist
+
+uninstall:
+	[ -f ~/Library/LaunchAgents/OSXRamDisk.plist ] && launchctl unload -w ~/Library/LaunchAgents/OSXRamDisk.plist
+	[ -f /usr/local/bin/createRAMDiskandMoveCaches.sh ] && rm -f /usr/local/bin/createRAMDiskandMoveCaches.sh
+	[ -f ~/Library/LaunchAgents/OSXRamDisk.plist ] && rm -f ~/Library/LaunchAgents/OSXRamDisk.plist
+	[ -h ~/Library/Caches/Google/Chrome/Default ] && bash -c "rm -f ~/Library/Caches/Google/Chrome/Default; mkdir ~/Library/Caches/Google/Chrome/Default"
+	./uninstall.sh

OSXRamDisk.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>Label</key>
+	<string>OSXRamDisk</string>
+	<key>ProgramArguments</key>
+	<array>
+		<string>/bin/bash</string>
+		<string>/usr/local/bin/createRAMDiskandMoveCaches.sh</string>
+	</array>
+	<key>RunAtLoad</key>
+	<true/>
+</dict>
+</plist>

README.md

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+OS X RAM Disk
+================
+
+This app will create a [RAM disk](http://en.wikipedia.org/wiki/RAM_drive) with specified size to 
+store apps cache in RAM, which is known as SSD optimization - reducing disk IO or making browsing the web and
+programming using IntelliJ more enjoyable.
+
+Supported apps (you can add yours):
+
+1. IntelliJ Idea 14
+
+1. Google Chrome
+
+1. Google Canary
+
+1. Safari
+
+1. iTunes
+
+1. todo: Android studio 
+
+1. your_app_goes_here
+
+The IntelliJ Idea is really fast after this. Be warned that for large projects you will need to have larger RAM Disk.
+
+If you observing performance degradation - revise how much memory you are using and may be adding more can help.
+By default script will create 4Gb RAM disk. If you need to change the size - edit createRAMDiskandMoveCaches.sh
+
+Compatibility
+============
+Works on
+* MAC OS X 10.10.2 Yosemite
+
+Give it a try before installing
+===============================
+```
+git clone [email protected]:zafarella/OSX-RAMDisk.git
+./createRAMDiskandMoveCaches.sh
+```
+
+Installation
+============
+```
+git clone [email protected]:zafarella/OSX-RAMDisk.git
+cd OSX-RAMDisk
+make install
+```
+
+Manual Installation
+------------------
+```
+cp OSXRamDisk.plist ~/Library/LaunchAgents
+cp createRAMDiskandMoveCaches.sh /usr/local/bin
+# note - it will close Chrome, safari idea
+/usr/local/bin/createRAMDiskandMoveCaches.sh
+```
+
+Uninstall
+============
+Run `make uninstall`
+or manually do following
+
+Close the chrome, idea or any other application you configured to use ram disk.
+```
+   rm /usr/local/bin/ChromeRamDisk.sh
+   launchctl unload -w ~/Library/LaunchAgents/OSXRamDisk.plist 
+   rm ~/Library/LaunchAgents/com.alanthing.ChromeRamDisk.plist
+```
+
+TODO
+===========
+Add support for persisting files in HDD (rsync) and restoring on system startup - will save a lot of time
+

createRAMDiskandMoveCaches.sh

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+#!/usr/bin/env bash
+
+# This is about to create a RAM disk in OS X and move the apps caches into it
+# to increase performance of those apps.
+# Performance gain is very significat, particularly for browsers and
+# especially for IDE
+#
+# Drawbacks and risks are that if RAM disk becomes full - performance will degrate
+# significantly. 
+#
+# USE AT YOUR OWN RISK.
+#
+
+# The RAM amount you want to allocate for RAM disk. One of
+# 1024 2048 3072 4096 5120 6144
+# todo: set default value to 1/4 of RAM
+ramfs_size_mb=4096
+mount_point=/Volumes/ramdisk
+ramfs_size_sectors=$((${ramfs_size_mb}*1024*1024/512))
+ramdisk_device=`hdid -nomount ram://${ramfs_size_sectors}`
+USERRAMDISK="$mount_point/$USER"
+
+# unmount if exists the RAM disk and mounts if doesn't
+mk_ram_disk()
+{
+    umount -f ${mount_point}
+    newfs_hfs -v 'ramdisk' ${ramdisk_device}
+    mkdir -p ${mount_point}
+    mount -o noatime -t hfs ${ramdisk_device} ${mount_point}
+
+    # Hide RAM disk, we don't really need it to be annoiyng in finder.
+    # comment out should you need it.
+    hide_ramdisk
+}
+
+# -------------------------
+# Application which needs the cache to be moved to RAM
+# -------------------------
+
+# Chrome Cache
+move_chrome_cache()
+{
+    close_app "Google Chrome"
+    /bin/rm -rf ~/Library/Caches/Google/Chrome/*
+    /bin/mkdir -pv $USERRAMDISK/Google/Chrome/Default
+    /bin/ln -v -s $USERRAMDISK/Google/Chrome/Default ~/Library/Caches/Google/Chrome/Default
+}
+
+# Chrome Canary Cache
+move_chrome_chanary_cache()
+{
+    /bin/rm -rf ~/Library/Caches/Google/Chrome\ Canary/*
+    /bin/mkdir -pv $USERRAMDISK/Google/Chrome\ Canary/Default
+    /bin/ln -v -s $USERRAMDISK/Google/Chrome\ Canary/Default ~/Library/Caches/Google/Chrome\ Canary/Default
+}
+
+# Safari Cache
+move_safari_cache()
+{
+    /bin/rm -rf ~/Library/Caches/com.apple.Safari
+    /bin/mkdir -pv $USERRAMDISK/Apple/Safari
+    osascript -e 'quit app "Safari"'
+    /bin/ln -v -s $USERRAMDISK/Apple/Safari ~/Library/Caches/com.apple.Safari
+}
+
+# iTunes Cache
+move_itunes_cache()
+{
+    /bin/rm -rf ~/Library/Caches/com.apple.iTunes
+    /bin/mkdir -pv $USERRAMDISK/Apple/iTunes
+    /bin/ln -v -s $USERRAMDISK/Apple/iTunes ~/Library/Caches/com.apple.iTunes
+}
+
+# Intellij Idea
+move_idea_cache()
+{
+   # todo add other versions support and CE edition
+   # make a backup of config - will need it when uninstalling
+   cp -f /Applications/IntelliJ\ IDEA\ 14.app/Contents/bin/idea.properties /Applications/IntelliJ\ IDEA\ 14.app/Contents/bin/idea.properties.back
+   # in case it is running not in startup - need to close the app to copy over the files.
+   close_app "IntelliJ Idea 14"
+   # Idea will create those dirs
+   echo "idea.system.path=$USERRAMDISK/Idea" >> /Applications/IntelliJ\ IDEA\ 14.app/Contents/bin/idea.properties
+   echo "idea.log.path=$USERRAMDISK/Idea/logs" >> /Applications/IntelliJ\ IDEA\ 14.app/Contents/bin/idea.properties
+}
+
+# todo Android Studio
+move_android_studio_cache()
+{
+    echo "moving Android Studio cache";
+    echo "Not implemented"
+}
+
+# Closes passed as arg app
+close_app()
+{
+    osascript -e "quit app \"${1}\"" 
+}
+
+# Open an application
+open_app()
+{
+     osascript -e "tell app \"${1}\" to activate" 
+}
+
+# Hide RamDisk directory
+hide_ramdisk()
+{
+    /usr/bin/chflags hidden $mount_point
+}
+
+# -----------------------------------------------------------------------------------
+# The entry point
+# -----------------------------------------------------------------------------------
+# Let's close the apps we moving caches for in case they are running.
+close_app "IntelliJ Idea 14"
+close_app "Google Chrome"
+close_app "Safari"
+# and create our RAM disk
+mk_ram_disk
+# move the caches
+move_chrome_cache
+move_safari_cache
+move_idea_cache
+
+echo "All good - I have done my job"
+#
+# open_app "Google Chrome"
+# -----------------------------------------------------------------------------------
+

uninstall.sh

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+#!/usr/bin/env bash
+
+# close the apps
+
+osascript -e "quit app \"Google Chrome\""
+osascript -e "quit app \"Chrome\ Canary\""
+osascript -e "quit app \"Safari\""
+osascript -e "quit app \"IntelliJ IDEA 14\""
+
+umount -f /Volumes/ramdisk
+
+# Browsers
+mkdir -p ~/Library/Caches/Google/Chrome/Default
+mkdir -p ~/Library/Caches/Google/Chrome\ Canary/Default
+mkdir -p ~/Library/Caches/com.apple.Safari
+# Hopefully nobody edited idea properties file - deleting the items we add
+# todo add sed statements to remove lines "smarter"
+head --lines=-2 /Applications/IntelliJ\ IDEA\ 14.app/Contents/bin/idea.properties /Applications/IntelliJ\ IDEA\ 14.app/Contents/bin/idea.properties