Created
March 27, 2009 14:27
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require 'rubygems' | |
require 'sinatra' | |
require 'redis' | |
# To use, simply start your Redis server and boot this | |
# example app with: | |
# ruby example_note_keeping_app.rb | |
# | |
# Point your browser to http://localhost:4567 and enjoy! | |
# | |
# Create the Redis client when the script starts | |
$redis = Redis.new | |
helpers do | |
def tag_link(t, title = nil) | |
arr = t.is_a?(Array) ? t : (@current_tags || []).dup.push(t) | |
path = arr.uniq.join('/') | |
%!<a href="/tags/#{path}">#{title || t}</a>! | |
end | |
end | |
# Loads all notes given by an array of IDs in a single Redis call | |
def load_notes(ids) | |
if ids.empty? | |
[] | |
else | |
$redis.mget(*ids.map { |id| "note-#{id}" }).map { |raw| Marshal.load(raw) } | |
end | |
end | |
get '/' do | |
@notes = load_notes $redis.smembers("all-notes") | |
erb :index | |
end | |
get '/tags/*' do | |
@current_tags = params[:splat].first.split('/') | |
redirect '/' if @current_tags.empty? | |
# Names of the tag-sets | |
sets = @current_tags.map { |t| "tag-#{t}" } | |
# Load all notes that reside in the intersection of these sets | |
@notes = load_notes $redis.sinter(*sets) | |
erb :index | |
end | |
get '/new' do | |
erb :new | |
end | |
post '/new' do | |
# Extract tags from request parameters | |
tags = params[:tags].gsub(/\s+/, '').split(',') | |
# Get ID for the new note | |
note_id = $redis.incr(:note_counter) | |
# Store the note | |
$redis.set("note-#{note_id}", Marshal.dump({ :contents => params[:contents], :tags => tags })) | |
$redis.sadd("all-notes", note_id) | |
# Add the ID to the tag-sets | |
tags.each { |t| $redis.sadd("tag-#{t}", note_id) } | |
redirect '/' | |
end | |
__END__ | |
@@ layout | |
<html> | |
<head> | |
<title>My notes</title> | |
<style type="text/css" media="screen"> | |
#main { | |
font-family: Helvetica; | |
width: 400px; | |
margin: 60px auto; | |
} | |
#head div { | |
float: right; | |
text-align: right; | |
font-size: 0.8em; | |
} | |
a { | |
text-decoration: none; | |
color: #000; | |
} | |
label { | |
font-size: 0.8em; | |
display: block; | |
width: 70px; | |
} | |
legend { | |
font-weight: bold; | |
} | |
input, textarea { | |
width: 100%; | |
margin-bottom: 1em; | |
} | |
input.submit { | |
width: auto; | |
float: right; | |
font-weight: bold; | |
} | |
div.note { | |
border-top: 2px dashed #bbb; | |
padding: 0.3em 1em; | |
background-color: #FFFFA0; | |
margin-bottom: 1em; | |
} | |
div.note .tags { | |
font-size: 0.6em; | |
font-style: italic; | |
color: #333; | |
} | |
div.note .tags > a { | |
color: #333; | |
} | |
h3.tags a span { | |
color: #f00; | |
font-size: 0.8em; | |
} | |
</style> | |
</head> | |
<div id="main"> | |
<div id="head"> | |
<div> | |
<a href="/new">new note</a> | |
</div> | |
<h1>My notes</h1> | |
</div> | |
<div> | |
<%= yield %> | |
</div> | |
</div> | |
</html> | |
@@ new | |
<fieldset> | |
<legend>New note</legend> | |
<form action="/new" method="post"> | |
<label>Contents:</label> | |
<textarea name="contents"></textarea> | |
<label>Tags:</label> | |
<input type="text" name="tags" /> | |
<input type="submit" value="Save" class="submit" /> | |
</form> | |
</fieldset> | |
@@ index | |
<% unless @current_tags.nil? %> | |
<h3 class="tags"> | |
Notes tagged with: | |
<%= @current_tags.map do |t| | |
t + tag_link(@current_tags - [t], "<span>(x)</span>") | |
end.join(', ') %> | |
</h3> | |
<% end %> | |
<% @notes.each do |note| %> | |
<div class="note"> | |
<div class="tags"> | |
Tags: <%= note[:tags].map { |tag| tag_link(tag) }.join(', ') %> | |
</div> | |
<pre><%= note[:contents] %></pre> | |
</div> | |
<% end %> |
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I get an error when I have no notes: "wrong number of arguments to mget". Adding the following to load_notes (line 24) fixes it:
return [] if ids.empty?