YARD: Yay! A Ruby Documentation Tool
Homepage: http://yardoc.org
IRC: irc.freenode.net / #yard
Git: http://github.com/lsegal/yard
Author: Loren Segal
Contributors: http://github.com/lsegal/yard/contributors
Copyright: 2007-2013
License: MIT License
Latest Version: 0.8.7.3
Release Date: November 1st 2013
Synopsis
YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions. Below is a summary of some of YARD's notable features.
Feature List
1. RDoc/SimpleMarkup Formatting Compatibility: YARD is made to be compatible with RDoc formatting. In fact, YARD does no processing on RDoc documentation strings, and leaves this up to the output generation tool to decide how to render the documentation.
2. Yardoc Meta-tag Formatting Like Python, Java, Objective-C and other languages: YARD uses a '@tag' style definition syntax for meta tags alongside regular code documentation. These tags should be able to happily sit side by side RDoc formatted documentation, but provide a much more consistent and usable way to describe important information about objects, such as what parameters they take and what types they are expected to be, what type a method should return, what exceptions it can raise, if it is deprecated, etc.. It also allows information to be better (and more consistently) organized during the output generation phase. You can find a list of tags in the {file:docs/Tags.md#taglist Tags.md} file.
YARD also supports an optional "types" declarations for certain tags. This allows the developer to document type signatures for ruby methods and parameters in a non intrusive but helpful and consistent manner. Instead of describing this data in the body of the description, a developer may formally declare the parameter or return type(s) in a single line. Consider the following method documented with YARD formatting:
# Reverses the contents of a String or IO object.
#
# @param [String, #read] contents the contents to reverse
# @return [String] the contents reversed lexically
def reverse(contents)
contents = contents.read if contents.respond_to? :read
contents.reverse
end
With the above @param tag, we learn that the contents parameter can either be a String or any object that responds to the 'read' method, which is more powerful than the textual description, which says it should be an IO object. This also informs the developer that they should expect to receive a String object returned by the method, and although this may be obvious for a 'reverse' method, it becomes very useful when the method name may not be as descriptive.
3. Custom Constructs and Extensibility of YARD: YARD is designed to be extended and customized by plugins. Take for instance the scenario where you need to document the following code:
class List
# Sets the publisher name for the list.
cattr_accessor :publisher
end
This custom declaration provides dynamically generated code that is hard for a
documentation tool to properly document without help from the developer. To
ease the pains of manually documenting the procedure, YARD can be extended by
the developer to handle the cattr_accessor
construct and automatically create
an attribute on the class with the associated documentation. This makes
documenting external API's, especially dynamic ones, a lot more consistent for
consumption by the users.
YARD is also designed for extensibility everywhere else, allowing you to add support for new programming languages, new data structures and even where/how data is stored.
4. Raw Data Output: YARD also outputs documented objects as raw data (the dumped Namespace) which can be reloaded to do generation at a later date, or even auditing on code. This means that any developer can use the raw data to perform output generation for any custom format, such as YAML, for instance. While YARD plans to support XHTML style documentation output as well as command line (text based) and possibly XML, this may still be useful for those who would like to reap the benefits of YARD's processing in other forms, such as throwing all the documentation into a database. Another useful way of exploiting this raw data format would be to write tools that can auto generate test cases, for example, or show possible unhandled exceptions in code.
5. Local Documentation Server: YARD can serve documentation for projects
or installed gems (similar to gem server
) with the added benefit of dynamic
searching, as well as live reloading. Using the live reload feature, you can
document your code and immediately preview the results by refreshing the page;
YARD will do all the work in re-generating the HTML. This makes writing
documentation a much faster process.
Installing
To install YARD, use the following command:
$ gem install yard
(Add sudo
if you're installing under a POSIX system as root)
Alternatively, if you've checked the source out directly, you can call
rake install
from the root project directory.
Important Note for Debian/Ubuntu users: there's a possible chance your Ruby
install lacks RDoc, which is occasionally used by YARD to convert markup to HTML.
If running which rdoc
turns up empty, install RDoc by issuing:
$ sudo apt-get install rdoc
Usage
There are a couple of ways to use YARD. The first is via command-line, and the second is the Rake task.
1. yard Command-line Tool
YARD comes packaged with a executable named yard
which can control the many
functions of YARD, including generating documentation, graphs running the
YARD server, and so on. To view a list of available YARD commands, type:
$ yard --help
Plugins can also add commands to the yard
executable to provide extra
functionality.
Generating Documentation
The yardoc
executable is a shortcut for yard doc
.
The most common command you will probably use is yard doc
, or yardoc
. You
can type yardoc --help
to see the options that YARD provides, but the
easiest way to generate docs for your code is to simply type yardoc
in your
project root. This will assume your files are
located in the lib/
directory. If they are located elsewhere, you can specify
paths and globs from the commandline via:
$ yardoc 'lib/**/*.rb' 'app/**/*.rb' ...etc...
The tool will generate a .yardoc
file which will store the cached database
of your source code and documentation. If you want to re-generate your docs
with another template you can simply use the --use-cache
(or -c)
option to speed up the generation process by skipping source parsing.
YARD will by default only document code in your public visibility. You can
document your protected and private code by adding --protected
or
--private
to the option switches. In addition, you can add --no-private
to also ignore any object that has the @private
meta-tag. This is similar
to RDoc's ":nodoc:" behaviour, though the distinction is important. RDoc
implies that the object with :nodoc: would not be documented, whereas
YARD still recommends documenting private objects for the private API (for
maintainer/developer consumption).
You can also add extra informative files (README, LICENSE) by separating the globs and the filenames with '-'.
$ yardoc 'app/**/*.rb' - README LICENSE FAQ
If no globs precede the '-' argument, the default glob (lib/**/*.rb
) is
used:
$ yardoc - README LICENSE FAQ
Note that the README file can be specified with its own --readme
switch.
You can also add a .yardopts
file to your project directory which lists
the switches separated by whitespace (newlines or space) to pass to yardoc
whenever it is run. A full overview of the .yardopts
file can be found in
{YARD::CLI::Yardoc}.
Queries
The yardoc
tool also supports a --query
argument to only include objects
that match a certain data or meta-data query. The query syntax is Ruby, though
a few shortcuts are available. For instance, to document only objects that have
an "@api" tag with the value "public", all of the following syntaxes would give
the same result:
--query '@api.text == "public"'
--query 'object.has_tag?(:api) && object.tag(:api).text == "public"'
--query 'has_tag?(:api) && tag(:api).text == "public"'
Note that the "@tag" syntax returns the first tag named "tag" on the object. To return the array of all tags named "tag", use "@@tag".
Multiple --query
arguments are allowed in the command line parameters. The
following two lines both check for the existence of a return and param tag:
--query '@return' --query '@param'
--query '@return && @param'
For more information about the query syntax, see the {YARD::Verifier} class.
2. Rake Task
The second most obvious is to generate docs via a Rake task. You can do this by
adding the following to your Rakefile
:
YARD::Rake::YardocTask.new do |t|
t.files = ['lib/**/*.rb', OTHER_PATHS] # optional
t.options = ['--any', '--extra', '--opts'] # optional
end
both the files
and options
settings are optional. files
will default to
lib/**/*.rb
and options
will represents any options you might want
to add. Again, a full list of options is available by typing yardoc --help
in a shell. You can also override the options at the Rake command-line with the
OPTS environment variable:
$ rake yard OPTS='--any --extra --opts'
3. yri
RI Implementation
The yri binary will use the cached .yardoc database to give you quick ri-style access to your documentation. It's way faster than ri but currently does not work with the stdlib or core Ruby libraries, only the active project. Example:
$ yri YARD::Handlers::Base#register
$ yri File.relative_path
Note that class methods must not be referred to with the "::" namespace separator. Only modules, classes and constants should use "::".
You can also do lookups on any installed gems. Just make sure to build the .yardoc databases for installed gems with:
$ sudo yard gems
If you don't have sudo access, it will write these files to your ~/.yard
directory. yri
will also cache lookups there.
4. yard server
Documentation Server
The yard server
command serves documentation for a local project or all installed
RubyGems. To serve documentation for a project you are working on, simply run:
$ yard server
And the project inside the current directory will be parsed (if the source has not yet been scanned by YARD) and served at http://localhost:8808.
Live Reloading
If you want to serve documentation on a project while you document it so that
you can preview the results, simply pass --reload
(-r
) to the above command
and YARD will reload any changed files on each request. This will allow you to
change any documentation in the source and refresh to see the new contents.
Serving Gems
To serve documentation for all installed gems, call:
$ yard server --gems
This will also automatically build documentation for any gems that have not been previously scanned. Note that in this case there will be a slight delay between the first request of a newly parsed gem.
5. yard graph
Graphviz Generator
You can use yard graph
to generate dot graphs of your code. This, of course,
requires Graphviz and the dot
binary. By default
this will generate a graph of the classes and modules in the best UML2 notation
that Graphviz can support, but without any methods listed. With the --full
option, methods and attributes will be listed. There is also a --dependencies
option to show mixin inclusions. You can output to stdout or a file, or pipe directly
to dot
. The same public, protected and private visibility rules apply to yard graph
.
More options can be seen by typing yard graph --help
, but here is an example:
$ yard graph --protected --full --dependencies
Changelog
-
November.1.13: 0.8.7.3 release
- Handle Unicode method/class/file names in server URL encoding (docmeta/rubydoc.info#69).
- Style keyword style hashes with same symbol color in code highlighting (#707).
- Fix broken JS when visiting docs in file:// scheme (#706).
- Add support for new AsciiDoc file extensions (#704).
- Fix issues where non-Ruby code blocks would not display in Ruby 2 (#702).
- Add support for extra Ruby 2 symbol types in Ripper (#701).
- Ensure config directory exists before saving config file (#700).
-
September.18.13: 0.8.7.2 release
- Disallow absolute URLs when using frame anchor support.
- Support casted functions in CRuby method declarations (#697)
-
September.11.13: 0.8.7.1 release
- Fix potential XSS issue with frame anchor support.
- Add support for gettext 3.x gem.
-
July.26.13: 0.8.7 release
- Added
--hide-api API
option to hide objects with a given@api
tag (#685). - Added "Returns ...." prefix to summary when a lone @return tag is used.
- Fixed issue that caused ref tags to be added to a docstring twice (#678).
- Fixed formatting issue in docstring summaries (#686)
- Added
-
June.27.13: 0.8.6.2 release
- Fixed issue where
yard graph
was not displaying methods
- Fixed issue where
-
April.14.13: 0.8.6.1 release
- Fixed broken links in File menu on default HTML template
- Added --layout switch to
yard display
to wrap output in layout template. - See {file:docs/WhatsNew.md} for more information on added features.
-
April.13.13: 0.8.6 release
- Various fixes and improved Ruby 2.x compatibility support
- Added support for
asciidoc
markup type - Added
yard markups
command to list available markup types - Added
yard display
command to display and format an individual object - See {file:docs/WhatsNew.md} for more information on added features.
-
February.26.13: 0.8.5.2 release
- Support new keyword argument syntax in method signatures (Ruby 2.x)
-
February.25.13: 0.8.5.1 release
- Fix
yard diff
of gem files with RubyGems 2.x
- Fix
-
February.24.13: 0.8.5 release
- Basic support for Ruby 2.0 (fix compat issues in RDoc 4.0, RubyGems 2.0)
- Add CSS styling for tables in default HTML template
-
February.5.13: 0.8.4.1 release
- Fix regression that broke loading of existing yardoc dbs (#648)
-
February.4.13: 0.8.4 release
- Add
-B/--bind
switch to yard server (#593, #608) - Add CodeObjects::Base#title for plugins to customize how object links display (#646)
- Disable linking objects filtered out by verifiers (#645)
- Allow macro expansion on class methods (#632)
- Expand newly attached macro on first DSL method call (#631)
- Disable RubyGems plugin in Ruby 2.0 (#627)
- Fix line range for class/module node bodies (#626)
- Search extended modules for attached DSL macros (#553)
- Add
-
October.14.12: 0.8.3 release
- Add
--non-transitive-tag
to disable tag transitivity (#571) - Support --db inside .yardopts for graph/server commands (#583, #586)
- Fix handling for =begin/=end docstrings (#577, #578)
- Parser only sorts file lists when a glob is provided (#572)
- Fix formatting in
{include:Object#method}
syntax (#569) - Fix @option tag inside of module functions (#563)
- Fix to
--api
and--no-api
support (#559) - Fix class nesting issues when path starts with "::" (#552)
- Add
-
June.9.12: 0.8.2.1 release
- Fix a set of regressions in yard server search and dynamic generation
-
June.7.12: 0.8.2 release
- Added progress style output in tty terminals
- Embedded mixins should ignore methods defined on module (#539)
- Fixed permalinks for embedded mixins in
yard server
(#540) - Improve parsing in CRuby code (#543)
- Ensure Registry.resolve picks module when parsing mixins (#545)
- Fixed regression that caused various commands to not show output (#548)
- Respect current visibility when parsing class conditions (#551)
-
May.2.12: 0.8.1 release
- Added
--[no-]api
switch to generate docs for API sets (see {file:docs/WhatsNew.md} for details) (#532) - The
yard list
command now uses cache by default (#533) - Fix
yardoc
generating incorrectly named method list file (#528) - Fix HTML output occasionally showing trailing mdash on options list (#522)
- Added
-
April.30.12: 0.8.0 release
- See {file:docs/WhatsNew.md} for a list of added features
- Over 20 bug fixes:
- Properly filter hidden setter/getter attributes (#394)
- Fix test failures in Linux environments (#397, #472, #473, #512, #513)
- Fix attribute inheritance and @private (#432)
- Fix attribute parsing (#435)
- Allow aliases for attributes (#436)
- Fix namespace fetching in
handle_alias()
(#437) - Fix overwritten attributes marked as inherited (#442)
- Fix documenting constants defined from C code with
rb_define_const()
(#443) - Do not escape snippets twice (#445)
- Ajax method/class search should not fire when a non-printable character is pressed (#446)
- Fix yard server crashing when RDoc is not installed (#456)
- Fix tags ignored when
(see #foo)
is used (#457) - Fix three "Returns" for two
@overload
tags (#458) - Do not auto-detect DSL methods as method objects if parameter name is not a valid method name (#464)
- Fix attaching of macros to Object (#465)
- Fix handling of
%w()
source in[]/[]=
parsed context. (#461, pull in #468) - Don't add default
@return
if@overload
has@return
. (#458, pull in #469) - Don't discard tags by (see ...). (#457, pull in #470)
- Fix constants listed as inherited when overwritten (#474)
- Fix
yardoc --asset
behaving differently on first and subsequent calls. (#477) !!!lang
code blocks should set the lang in<pre>
's class. (#478, #479)- Fix "File List" search tab error. (#502)
- Fix search bar not redirecting to method page. (#509)
- Fix server returning exception message bodies as String (#518)
-
January.31.12: 0.7.5 release
- Various minor bug fixes
-
December.2.11: 0.7.4 release
- Redcarpet is now the default Markdown formatting library. GFM now works out-of-box (#404)
- Fix server side searching for elements that are marked private (#420)
- Add 'textile_strict' and 'pre' markup types, reorganize text and none (#416)
- Improve encoding line detection (#415)
- Add support for
rb_define_alias
in CRuby code (#413) - Fix rendering of some keywords in source view (#410)
- Add support for RDoc 3.10+ (#406, #407)
- Fix typewriter text being processed in code blocks (#403)
- Improve support for has_rdoc in RubyGems 1.8.x (#401)
- See the {file:docs/WhatsNew.md} document for details on added features
-
October.15.11: 0.7.3 release
- Improve support for parsing under Ruby 1.9.2p290 and 1.9.3 (#365, #370)
- Add support for SWIG generated CRuby code (#369)
- Add support for
rb_define_attr
calls in CRuby code (#362) - Handle file pointers in CRuby code (#358)
-
June.14.11: 0.7.2 release
- Fix
yard --help
not showing proper output - YARD now expands path to
.yardoc
file in daemon mode for server (#328) - Fix
@overload
tag linking to wrong method (#330) - Fix incorrect return type when using
@macro
(#334) - YARD now requires 'thread' to support RubyGems 1.7+ (#338)
- Fix bug in constant documentation when using
%w()
(#348) - Fix YARD style URL links when using autolinking markdown (#353)
- Fix
-
May.18.11: 0.7.1 release
- Fixes a bug in
yard server
not displaying class list properly.
- Fixes a bug in
-
May.17.11: 0.7.0 release
- See the {file:docs/WhatsNew.md} document for details on added features
- Make sure that Docstring#line_range is filled when possible (#243)
- Set #verifier in YardocTask (#282)
- Parse BOM in UTF-8 files (#288)
- Fix instance attributes not showing up in method list (#302)
- Fix rendering of %w() literals in constants (#306)
- Ignore keyboard shortcuts when an input is active (#312)
- And more...
-
April.14.11: 0.6.8 release
- Fix regression in RDoc 1.x markup loading
- Fix regression in loading of markup libraries for
yard server
-
April.6.11: 0.6.7 release
- Fix has_rdoc gem specification issue with new RubyGems plugin API (oops!)
-
April.6.11: 0.6.6 release
- Fix error message when RDoc is not present (#270)
- Add markup type 'none' to perform basic HTML translation (fallback when RDoc is not present)
- Add support for RubyGems 1.7.x (#272)
- Fix rendering of
{url description}
syntax when description contains newline
-
March.13.11: 0.6.5 release
- Support
ripper
gem in Ruby 1.8.7 - Upgrade jQuery to 1.5.1
- Fix handling of alias statements with quoted symbols (#262)
- Add CSS styles (#260)
- Unhandled exception in YARD::Handlers::Ruby::MixinHandler indexing documentation for eventmachine (#248)
- Splice any alias references on method re-definitions into separate methods (#247)
- Fix "yard graph" (#245)
- Don't process ++ typewriter text inside of HTML attributes (#244)
- Prioritize loading of Kramdown before Maruku (#241)
- Skip shebang encoding in docstrings (#238)
- Fix truncation of references in @deprecated (#232)
- Show @api private note when no other tags are present (#231)
- Detect docstrings starting with "##" as
Docstring#hash_flag
(#230) - Remove trailing whitespace from freeform tags (#229)
- Fix line through for deprecated methods (#225)
- Mistake in Tags.md (#223)
- Improve database storage by being more efficient with filesystem usage (#222)
- Make Registry thread local (#221)
- Support
private_constant
class method for 1.9.3 (#219) - Do not assume RDoc is installed (#214)
- Support
-
December.21.10: 0.6.4 release
- Fix yri tool crashing with new Config class (gh-217)
- Fix support for ::TopLevelConstants (gh-216)
- YARD's test suite is now RSpec2 compatible (gh-215)
- Improved documentation for YARD::Server features (gh-207)
- Fix displaying of collaped method summary lists (gh-204)
- Fix automatic loading of markup providers (gh-206)
- Fix keyboard shortcuts for Chrome (gh-203)
- Disallow
extend self
inside of a class (gh-202) - Constants now recognized in C extensions (gh-201)
-
November.21.10: 0.6.3 release
- Fixed regression that caused
yardoc --markup
to silently exit
- Fixed regression that caused
-
November.15.10: 0.6.2 release
- Plugins no longer automatically load, use
--plugin
to load a plugin - Added YARD::Config and ~/.yard/config YAML configuration file
- Added
yard config
command to view/edit YARD configuration file - Fixes for YARD in 1.8.6 (gh-178)
- Various HTML template adjustments and fixes (gh-198,199,200)
- Improved
yard server -m
multi-project stability (gh-193) - Fixed handling of
yardoc --no-private
with missing class definitions (gh-197) - Added support for constants defined in C extensions (gh-177)
- Added support for Structs defined as "Klass = Struct.new(...)" (gh-187)
- Improved parsing support for third-party gems (gh-174,180)
- Improved support for JRuby 1.6.4+. YARD now passes all specs in JRuby (gh-185)
- Improved YARD documentation (gh-172,191,196)
- Plugins no longer automatically load, use
-
September.06.10: 0.6.1 release
- Fixed TOC showing on top of class/method list in no-frames view
- A message now displays when running
yard server
with Rack/Mongrel installed - Improved performance of JS inline search for large class/method lists
- Improved link titles for relative object links
- Removed
String#camelcase
andString#underscore
for better Rails compat. - Fixed support for loading .yardoc files under Windows
- Fixed inheritance tree arrows not displaying in certain environments
-
August.29.10: 0.6.0 release
- Added dynamic local documentation server
- Added @group/@endgroup declarations to organize methods into groups
- Added
yard
executable to serve as main CLI tool with pluggable commands - Added
--asset
switch toyardoc
to copy files/dirs to output dir - Added ability to register/manipulate tags via CLI (
--tag
, etc.) - Added
yard diff
command - Added statistics to
yardoc
output (andyard stats
command) - Added Javascript generated Table of Contents to file pages
- Updated various APIs
- Removed
yard-graph
executable - See more changes in the {file:docs/WhatsNew.md what's new document}
-
June.22.10: 0.5.8 release
- Merge fix from 0.6 branch for --no-private visibility checking
-
June.21.10: 0.5.7 release
- Fixed visibility flag parsing in
yardoc
- Updated Parser Architecture documentation with new SourceParser API
- Improved Registry documentation for new load commands
- Fix loading of .yardoc file as cache (and preserving aliases)
- Fix "lib" directory missing when running YARD on installed gems
- Fixed visibility flag parsing in
-
June.12.10: 0.5.6 release
- Bug fixes for RubyGems plugin,
has_rdoc=false
should now work - New API for registering custom parsers. See {file:docs/WhatsNew.md}
- Bug fixes for RubyGems plugin,
-
May.22.10: 0.5.5 release
- Various bug fixes
-
March.22.10: 0.5.4 release
- See {file:docs/WhatsNew.md what's new document} for changes
-
January.11.10: 0.5.3 release
- See {file:docs/WhatsNew.md what's new document} for changes
-
December.16.09: 0.5.2 release
- See {file:docs/WhatsNew.md what's new document} for changes
-
December.15.09: 0.5.1 release
- See {file:docs/WhatsNew.md what's new document} for changes
-
December.13.09: 0.5.0 release
- See {file:docs/WhatsNew.md what's new document} for changes
-
November.15.09: 0.4.0 release
- Added new templating engine based on tadpole
- Added YARD queries (
--query
CLI argument to yardoc) - Greatly expanded YARD documentation
- Added plugin support
- New
@abstract
and@private
tags - Changed default rake task to
rake yard
- Read about changes in {file:docs/WhatsNew.md}
-
August.13.09: 0.2.3.5 release
- Minor bug fixes.
-
August.07.09: 0.2.3.4 release
- Minor bug fixes.
-
July.26.09: 0.2.3.3 release
- Minor bug fixes.
-
July.06.09: 0.2.3.2 release
-
Fix Textile hard-break issues
-
Add description for @see tag to use as link title in HTML docs.
-
Add --title CLI option to specify a title for HTML doc files.
-
Add custom.css file that can be overridden with various custom styelsheet declarations. To use this, simply add
default/fulldoc/html/custom.css
inside your code directory and use the-t
template directory yardoc CLI option to point to that template directory (the dir holding 'default'). -
Add support in
yardoc
CLI to specify extra files (formerly --files) by appending "- extra files here" after regular source files. Example:yardoc --private lib/**/*.rb - FAQ LICENSE
-
-
Jun.13.09: 0.2.3.1 release.
- Add a RubyGems 1.3.2+ plugin to generate YARD documentation instead of
RDoc. To take advantage of this plugin, set
has_rdoc = 'yard'
in your .gemspec file.
- Add a RubyGems 1.3.2+ plugin to generate YARD documentation instead of
RDoc. To take advantage of this plugin, set
-
Jun.07.09: 0.2.3 release. See the {file:docs/WhatsNew.md} file for a list of important new features.
-
Jun.16.08: 0.2.2 release. This is the largest changset since yard's conception and involves a complete overhaul of the parser and API to make it more robust and far easier to extend and use for the developer.
-
Feb.20.08: 0.2.1 release.
-
Feb.24.07: Released 0.1a experimental version for testing. The goal here is to get people testing YARD on their code because there are too many possible code styles to fit into a sane amount of test cases. It also demonstrates the power of YARD and what to expect from the syntax (Yardoc style meta tags).
Copyright
YARD © 2007-2013 by Loren Segal. YARD is licensed under the MIT license except for some files which come from the RDoc/Ruby distributions. Please see the {file:LICENSE} and {file:LEGAL} documents for more information.