Renaming XCode projects

From (http://aplus.rs/cocoa/how-to-rename-project-in-xcode-3x)

Copy/rename the folder into new name

Get inside the new folder and rename the .pch and .xcodeproj files

Delete the build folder

Open .xcodeproj file in text editor, like TextMate or TextWrangler. That’s actually a folder, which contains 4 files (you can also right-click and do Show package contents, which will reveal the files)

Open project.pbxproj in text editor and replace all instances of the old name with the new name

Load the project file in XCode, do Build/Clean all targets

convert aif to mp3

ffmpeg -i some.aif -f mp3 -ab 192 -ar 44100 some.mp3

emacs and etags

create tags file:

find . -name '*.cpp' -o -name '*.h' -o -name '*.c' | xargs etags -a -o tags

M-. go to symbol def
M-0 M-. next
M-* return
M-X tags-search
M-, next match

Alpha compositing with rmagick

Source

Destination

Result

Ruby source:

require 'rubygems'

require 'RMagick'

include Magick

dst = Image.read("dst.png")[0]

src = Image.read("src.png")[0]

result = dst.composite(src, 0, 0, OverCompositeOp)

result.write("result.png")

result.display

exit