a simple DSL for creating temporary files and directories
Ever want to create a whole bunch of files at once? Like when you're writing tests for a tool that processes files? The Files gem lets you cleanly specify those files and their contents inside your test code, instead of forcing you to create a fixture directory and check it in to your repo. It puts them in a temporary directory and cleans up when your test is done.
Usage (mixin mode)
The mixin mode is a fairly clean API, suitable for use in unit tests. After
include Files you can call
dir to make a temporary file or directory; it'll put them into a new temp dir that is removed on process exit. It also saves a reference to this directory inside an instance variable named
@files (so don't use that name for your own instance variables).
require "files" include file "hello.txt" # creates file "hello.txt" containing "contents of hello.txt" dir "web" do # creates directory "web" file "snippet.html", # creates file "web/snippet.html"... "<h1>Fix this!</h1>" # ...containing "<h1>Fix this!</h1>" dir "img" do # creates directory "web/img" file File.new("data/hello.png") # containing a copy of hello.png file "hi.png", File.new("data/hello.png") # and a copy of hello.png named hi.png end end @files.root # returns the path to the temporary directory, creating it if necessary
Usage (bare function mode)
In bare function mode, you call the
Files method, which doesn't pollute the current object with a
@files instance variable. It returns a string with the path to the root temp dir that you can use later.
require "files" temp_dir = do # creates a temporary directory inside Dir.tmpdir file "hello.txt" # creates file "hello.txt" containing "contents of hello.txt" dir "web" do # creates directory "web" file "snippet.html", # creates file "web/snippet.html"... "<h1>Fix this!</h1>" # ...containing "<h1>Fix this!</h1>" dir "img" do # creates directory "web/img" file File.new("data/hello.png") # containing a copy of hello.png file "hi.png", File.new("data/hello.png") # and a copy of hello.png named hi.png end end end # "Files" returns a string with the path to the directory src = '/path/to/some/data' # use '/path/to/some/data/.' to only copy contents of data folder, not data folder itself. # creates a folder called 'target/$timestamp' relative to pwd dir = . :path => "target" do dir "foo", :src => src do # creates 'target/$timestamp/foo', and copies src into foo [but should it copy the dir or the contents?] end end
test/files_test.rb for more usage examples
- the directory will be removed at exit
- unless you pass
:remove => false
- unless you pass
- the directory name is based on the name of the source file you called Files from
- if the first argument to
fileis a String, then a new file is made
- the content of the new file is either a short, descriptive message, or whatever you passed as the second argument
- if the argument to
fileis a Ruby
Fileobject, then it copies the named file into the new location
- To copy another directory to one created by this module, specifying
- [Not sure if this is implemented right... should it copy the dir or its contents?]
dir doblock is executed in the scope of the
Dirobject, so it can't call methods on your object directly. Instead, set a temporary local variable, like this:
my_cheese = cheese() dir do file "which_cheese.txt", my_cheese end
- take a hash or a YAML file or YAML string to specify the directory layout and contents
- emit a hash or a YAML file or string to serialize the directory layout and contents for later
- support symlinks (?)
- specify file write mode (?)
- play nice with FakeFS (possibly with a :fake option)
- global/default :remove option
Copyright (C) 2012 Alex Chaffee
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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