From: Joel VanderWerf <joelvanderwerf@...>
Date: 2012-01-26T05:13:28+09:00
Subject: Re: [ANN] "files" gem - for creating temporary files and dirs

On 01/24/2012 12:03 PM, Alex Chaffee wrote:
> 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 API currently has two modes -- mixin and function -- and I would
> absolutely adore feedback on which mode is more useful, or other
> advice about naming the methods and especially the instance var in
> mixin mode.
>
> Usage (mixin mode):
>
>      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

Here's another way to do it. (FSDB does a lot of other stuff, too...)

require 'fsdb' # gem install fsdb
require 'tmpdir'

data = FSDB::Database.new "data"

formats = [
   FSDB::TEXT_FORMAT.when(/\.txt$|\.html$/),
   FSDB::BINARY_FORMAT.when(/\.png$/)
]

data.formats = formats

Dir.mktmpdir do |dir|
   #dir = "tmp1" # for testing, use a dir that won't be deleted

   tmp = FSDB::Database.new(dir)
   tmp.formats = formats

   tmp["hello.txt"] = "contents of hello.txt"
   tmp["web/snippet.html"] = "<h1>Fix this!</h1>"

   img = tmp.subdb("img")
   img["hello.png"] = data["hello.png"]
   img["hi.png"] = data["hello.png"]
end

# you can automatically serialize objects in yaml, json, or marshal:
require 'yaml'
require 'json'

Dir.mktmpdir do |dir|
   #dir = "tmp2" # for testing, use a dir that won't be deleted

   tmp = FSDB::Database.new(dir)
   json_format = FSDB::Format.new(
     /\.json$/, /\.js$/,
     :name => "JSON_FORMAT",
     :load => proc {|f| JSON.load(f)},
     :dump => proc {|object, f| f.syswrite(JSON.dump(object))}
   )
   tmp.formats = formats + [FSDB::YAML_FORMAT, json_format]

   tmp["a.yaml"] = {:some => ["complex", Object]}
   tmp["b.json"] = ["foo", 2, 3]
end