Extract Files

Extract files from files or stdin for a given extension.

I know. Before this I use this snippet:

for css_file in `find css -name "*.css" ` ; do sed  -n 's/^.*url *( *"*\'"'"'*\([^"]*\)\'"'"'*"* *).*$/'`dirname $css_file`'\/\1/p' $css_file  ; done | ruby  -n -e "puts File.expand_path(\$_)[File.expand_path('.').size+1..-1]"

Probably could be improve.

Given a css file with absolute and relative images

	$ cat style.css
	body {
		background: url(../images/bg.jpg), url ( ../images/bg2.jpg );
		background: url("../images/bg3.jpg");
		background: url('/images/bg4.jpg);
		background: url('images/bg5.jpg');
	}

Extract the images only -e jpg -e png -e gif

	$ cat style.css | extract_files -e jpg
	../images/bg.jpg
	../images/bg2.jpg
	../images/bg3.jpg
	/images/bg4.jpg
	images/bg5.jpg

Now, relative to the css directory -b css

	$ cat style.css | extract_files  -e jpg -b css
	css/../images/bg.jpg
	css/../images/bg2.jpg
	css/../images/bg3.jpg
	css/images/bg4.jpg
	css/images/bg5.jpg

And do the path expansion -p.

	$ cat style.css | extract_files  -e jpg -b css -p
	images/bg.jpg
	images/bg2.jpg
	images/bg3.jpg
	css/images/bg4.jpg
	css/images/bg5.jpg

Or show the full path -f.

	$ cat style.css | extract_files  -e jpg -b css -p -f
	/Users/guillermo/Documents/extract_files/images/bg.jpg
	/Users/guillermo/Documents/extract_files/images/bg2.jpg
	/Users/guillermo/Documents/extract_files/images/bg3.jpg
	/Users/guillermo/Documents/extract_files/css/images/bg4.jpg
	/Users/guillermo/Documents/extract_files/css/images/bg5.jpg

You can pass the file/files directly:

	$ extract_files * -e png
	image1.png
	/images/img1.png

There are two ways of installing this small libbrary:

$ gem install extract_files

You will have the code as a library and the binary

	curl -O https://raw.github.com/guillermo/extract_files/master/bin/extract_files
	chmod +x extract_files

The script is generated automatically with rake, so if you fork, ensure that you edit the correct files.

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|  _ \ / _ \/ _ \ '__\ \ /\ / / _` | '__/ _ \
| |_) |  __/  __/ |   \ V  V / (_| | | |  __/
|____/ \___|\___|_|    \_/\_/ \__,_|_|  \___|
                                             
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| |   (_) ___ ___ _ __  ___  ___ 
| |   | |/ __/ _ \ '_ \/ __|/ _ \
| |___| | (_|  __/ | | \__ \  __/
|_____|_|\___\___|_| |_|___/\___|
                                 
----------------------------------------------------------------------------
"THE BEER-WARE LICENSE" (Revision 42):
guillermo@cientifico.net wrote this file. As long as you retain this 
notice you can do whatever you want with this stuff. If we meet some day,
and you think this stuff is worth it, you can buy me a beer in return 
Guillermo Alvarez Fernandez
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