require 'rio': Rio 0.4.1 Released

New

Includes fix for bug involving file system paths with special characters.
Other minor fixes.

Rio - Ruby I/O Facilitator

fa-cil-i-tate: To make easy or easier.

Overview

Rio is a facade for most of the standard ruby classes that deal with I/O; providing a simple, intuitive, succinct interface to the functionality provided by IO, File, Dir, Pathname, FileUtils, Tempfile, StringIO, OpenURI and others. Rio also provides an application level interface which allows many common I/O idioms to be expressed succinctly.

SYNOPSIS

For the following assume:
astring = ""
anarray = []

Iterate over the .rb files in a directory.
rio('adir').files('*.rb') { |entrio| ... }

Return an array of the .rb files in a directory.
anarray = rio('adir').files['*.rb']

Copy the .rb files in a directory.to another directory.
rio('adir').files('*.rb') > rio('another_directory')

Iterate over the .rb files in a directory and its subdirectories.
rio('adir').all.files('*.rb') { |entrio| ... }

Return an array of the .rb files in a directory and its
subdirectories.
anarray = rio('adir').all.files['*.rb']

Copy or append a file to a string
rio('afile') > astring # copy
rio('afile') >> astring # append

Copy or append a string to a file
rio('afile') <>

Copy or append the lines of a file to an array
rio('afile') > anarray
rio('afile') >> anarray

Copy or append a file to another file
rio('afile') > rio('another_file')
rio('afile') >> rio('another_file')

Copy a file to a directory
rio('adir') <<>

Copy a directory to another directory
rio('adir') >> rio('another_directory')

Copy a web-page to a file
rio('http://rubydoc.org/') > rio('afile')

Read a web-page into a string
astring = rio('http://rubydoc.org/').read

Ways to get the chomped lines of a file into an array
anarray = rio('afile').chomp[] # subscript operator
rio('afile').chomp > anarray # copy-to operator
anarray = rio('afile').chomp.to_a # to_a
anarray = rio('afile').chomp.readlines # IO#readlines

Iterate over selected lines of a file
rio('adir').lines(0..3) { |aline| ... } # a range of lines
rio('adir').lines(/re/) { |aline| ... } # by regular expression
rio('adir').lines(0..3,/re/) { |aline| ... } # or both

Return selected lines of a file as an array
rio('adir').lines[0..3] # a range of lines
rio('adir').lines[/re/] # by regular expression
rio('adir').lines[0..3,/re/] # or both

Iterate over selected chomped lines of a file
rio('adir').chomp.lines(0..3) { |aline| ... } # a range of lines
rio('adir').chomp.lines(/re/) { |aline| ... } # by regular expression

Return selected chomped lines of a file as an array
rio('adir').chomp[0..3] # a range of lines
rio('adir').chomp[/re/] # by regular expression

Copy a gzipped file un-gzipping it
rio('afile.gz').gzip > rio('afile')

Copy a plain file, gzipping it
rio('afile.gz').gzip <>

Copy a file from a ftp server into a local file un-gzipping it
rio('ftp://host/afile.gz').gzip > rio('afile')

Return an array of .rb files excluding symlinks to .rb files
rio('adir').files('*.rb').skip[:symlink?]

Put the first 10 chomped lines of a gzipped file into an array
anarray = rio('afile.gz').chomp.gzip[0...10]

Copy lines 0 and 3 thru 5 of a gzipped file on an ftp server to stdout
rio('ftp://host/afile.gz').gzip.lines(0,3..5) > ?-

Return an array of files in a directory and its subdirectories,
without descending into .svn directories.
rio('adir').norecurse(/^\.svn$/).files[]

Iterate over the non-empty, non-comment chomped lines of a file
rio('afile').chomp.skip(:empty?,/^\s*#/) { |line| ... }

Copy the output of th ps command into an array, skipping the header
line and the ps command entry
rio(?-,'ps -a').skiplines(0,/ps$/) > anarray

Prompt for input and return what was typed
ans = rio(?-).print("Type Something: ").chomp.gets

Change the extension of all .htm files in a directory and its
subdirectories to .html
rio('adir').rename.all.files('*.htm') do |htmfile|
htmfile.extname = '.html'
end

Copy a CSV file, changing the separator to a semicolon
rio('comma.csv').csv > rio('semicolon.csv').csv(';')

Iterate through a CSVfile with each line parsed into an array
rio('afile.csv').csv { |array_of_fields| ...}

Create a tab separated file of accounts in a UNIX passwd file,
listing only the username, uid, and realname fields
rio('/etc/passwd').csv(':').columns(0,2,4) > rio('rpt').csv("\t")

Pipe multiple commands
rio('afile') | rio(?-,'acmd') | 'another_cmd' | ?-

Contact

Project:: http://rubyforge.org/projects/rio/
Documentation:: http://rio.rubyforge.org/
Bugs:: http://rubyforge.org/tracker/?group_id=821