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.
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 Files 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
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 = Files 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/$timestamp' relative to pwd dir = Files.create :path => "target" do dir "foo", :src => src do # creates 'target/$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
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