rake-toolkit_program v0.1.2
# Rake::ToolkitProgram
Create toolkit programs easily with `Rake` and `OptionParser` syntax. Bash completions and usage help are baked in.
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'rake-toolkit_program'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install rake-toolkit_program
## Quickstart
* Shebang it up (in a file named `awesome_tool.rb`)
```ruby
#!/usr/bin/env ruby
```
* Require the library
```ruby
require 'rake/toolkit_program'
```
* Make your life easier
```ruby
Program = Rake::ToolkitProgram
```
* Define your command tasks
```ruby
Program.command_tasks do
desc "Build it"
task 'build' do
# Ruby code here
end
desc "Test it"
task 'test' => ['build'] do
# Rake syntax ↑↑↑↑↑↑↑ for dependencies
# Ruby code here
end
end
```
You can use `Program.args` in your tasks to access the other arguments on the command line. For argument parsing integrated into the help provided by the program, see the use of `Rake::Task(Rake::ToolkitProgram::TaskExt)#parse_args` below.
* Wire the mainline
```ruby
Program.run(on_error: :exit_program!) if $0 == __FILE__
```
* In the shell, prepare to run the program (UNIX/Linux systems only)
```console
$ chmod +x awesome_tool.rb
$ ./awesome_tool.rb --install-completions
Completions installed in /home/rtweeks/.bashrc
Source /home/rtweeks/.bash-complete/awesome_tool.rb-completions for immediate availability.
$ source /home/rtweeks/.bash-complete/awesome_tool.rb-completions
```
* Ask for help
```console
$ ./awesome_tool.rb help
*** ./awesome_tool.rb Toolkit Program ***
.
.
.
```
## Usage
Let's look at a short sample toolkit program -- put this in `awesome.rb`:
```ruby
#!/usr/bin/env ruby
require 'rake/toolkit_program'
require 'ostruct'
ToolkitProgram = Rake::ToolkitProgram
ToolkitProgram.title = "My Awesome Toolkit of Awesome"
ToolkitProgram.command_tasks do
desc <<-END_DESC.dedent
Fooing myself
I'm not sure what I'm doing, but I'm definitely fooing!
END_DESC
task :foo do
a = ToolkitProgram.args
puts "I'm fooed#{' on a ' if a.implement}#{a.implement}"
end.parse_args(into: OpenStruct.new) do |parser, args|
parser.no_positional_args!
parser.on('-i', '--implement IMPLEMENT', 'An implement on which to be fooed') do |val|
args.implement = val
end
end
end
if __FILE__ == $0
ToolkitProgram.run(on_error: :exit_program!)
end
```
Make sure to `chmod +x awesome.rb`!
What does this support?
$ ./awesome.rb foo
I'm fooed
$ ./awesome.rb --help
*** My Awesome Toolkit of Awesome ***
Usage: ./awesome.rb COMMAND [OPTION ...]
Avaliable options vary depending on the command given. For details
of a particular command, use:
./awesome.rb help COMMAND
Commands:
foo Fooing myself
help Show a list of commands or details of one command
Use help COMMAND to get more help on a specific command.
$ ./awesome.rb help foo
*** My Awesome Toolkit of Awesome ***
Usage: ./awesome.rb foo [OPTION ...]
Fooing myself
I'm not sure what I'm doing, but I'm definitely fooing!
Options:
-i, --implement IMPLEMENT An implement on which to be fooed
$ ./awesome.rb --install-completions
Completions installed in /home/rtweeks/.bashrc
Source /home/rtweeks/.bash-complete/awesome.rb-completions for immediate availability.
$ source /home/rtweeks/.bash-complete/awesome.rb-completions
$ ./awesome.rb <tab><tab>
foo help
$ ./awesome.rb f<tab>
↳ ./awesome.rb foo
$ ./awesome.rb foo <tab>
↳ ./awesome.rb foo --
$ ./awesome.rb foo --<tab><tab>
--help --implement
$ ./awesome.rb foo --i<tab>
↳ ./awesome.rb foo --implement
$ ./awesome.rb foo --implement <tab><tab>
--help awesome.rb
$ ./awesome.rb foo --implement spoon
I'm fooed on a spoon
### Defining Toolkit Commands
Just define tasks in the block of `Rake::ToolkitProgram.command_tasks` with `task` (i.e. `Rake::DSL#task`). If `desc` is used to provide a description, the task will become visible in help and completions.
When a command task is initially defined, positional arguments to the command are available as an `Array` through `Rake::ToolkitProgram.args`.
### Option Parsing
This gem extends `Rake::Task` with a `#parse_args` method that creates a `Rake::ToolkitProgram::CommandOptionParser` (derived from the standard library's `OptionParser`) and an argument accumulator and `yield`s them to its block.
* The arguments accumulated through the `Rake::ToolkitProgram::CommandOptionParser` are available to the task in `Rake::ToolkitProgram.args`, replacing the normal `Array` of positional arguments.
* Use the `into:` keyword of `#parse_args` to provide a custom argument accumulator object for the associated command. The default argument accumulator constructor can be defined with `Rake::ToolkitProgram.default_parsed_args`. Without either of these, the default accumulator is a `Hash`.
* Options defined using `OptionParser#on` (or any of the variants) will print in the help for the associated command.
### Positional Arguments
Accessing positional arguments given after the command name depends on whether or not `Rake::Task(Rake::ToolkitProgram::TaskExt)#parse_args` has been called on the command task. If this method is not called, positional arguments will be an `Array` accessible through `Rake::ToolkitProgram.args`.
When `Rake::Task(Rake::ToolkitProgram::TaskExt)#parse_args` is used:
* `Rake::ToolkitProgram::CommandOptionParser#capture_positionals` can be used to define how positional arguments are accumulated.
* If the argument accumulator is a `Hash`, the default (without calling this method) is to assign the `Array` of positional arguments to the `nil` key of the `Hash`.
* For other types of accumulators, the positional arguments are only accessible if `Rake::ToolkitProgram::CommandOptionParser#capture_positionals` is used to define how they are captured.
* If a block is given to this method, the block of the method will receive the `Array` of positional arguments. If it is passed an argument value, that value is used as the key under which to store the positional arguments if the argument accumulator is a `Hash`.
* `Rake::ToolkitProgram::CommandOptionParser#expect_positional_cardinality` can be used to set a rule for the count of positional arguments. This will affect the _usage_ presented in the help for the associated command.
* `Rake::ToolkitProgram::CommandOptionParser#map_positional_args` may be used to transform (or otherwise process) positional arguments one at a time and in the context of options and/or arguments appearing earlier on the command line.
### Convenience Methods
* `Rake::Task(Rake::ToolkitProgram::TaskExt)#prohibit_args` is a quick way, for commands that accept no options or positional arguments, to declare this so the help and bash completions reflect this. It is equivalent to using `#parse_args` and telling the parser `parser.expect_positional_cardinality(0)`.
* `Rake::ToolkitProgram::CommandOptionParser#no_positional_args!` is a shortcut for calling `#expect_positional_cardinality(0)` on the same object.
* `Rake::Task(Rake::ToolkitProgram::TaskExt)#invalid_args!` and `Rake::ToolkitProgram::CommandOptionParser#invalid_args!` are convenient ways to raise `Rake::ToolkitProgram::InvalidCommandLine` with a message.
## OptionParser in Rubies Before and After v2.4
The `OptionParser` class was extended in Ruby 2.4 to simplify capturing options into a `Hash` or other container implementing `#[]=` in a similar way. This gem supports that, but it means that behavior varies somewhat between the pre-2.4 era and the 2.4+ era. To have consistent behavior across that version change, the recommendation is to use a `Struct`, `OpenStruct`, or custom class to hold program options rather than `Hash`.
## Development
After checking out the repo, run `bin/setup` to install dependencies. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
To run the tests, use `rake`, `rake test`, or `rspec spec`. Tests can only be run on systems that support `Kernel#fork`, as this is used to present a pristine and isolated environment for setting up the tool. If run using Ruby 2.3 or earlier, some tests will be pending because functionality expects Ruby 2.4's `OptionParser`.
## Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/PayTrace/rake-toolkit_program. For further details on contributing, see [CONTRIBUTING.md](./CONTRIBUTING.md).
Maintenance
Popularity
Security
Deps
Abandoned. Last published 6 years ago.