flow-lite gem - lite workflow engine; let's you define your workflow in Flowfiles and incl. flow command line tool

Hello,

   I have bundled up in the flow-lite gem [1] - a lite (lightweight)
workflow engine that let's you define your workflow steps in Flowfiles (in ruby)
and includes the flow command line tool.

The original itch / need / inspiration was / is the use in GitHub
Actions (Workflows).

Happy automating with ruby. Cheers. Prost.

[1] https://github.com/rubycoco/git/tree/master/flow-lite

PS: From the readme - Usage:

Define the workflow steps in a Flowfile. Example:

step :first_step do
  puts "first_step"
  second_step    # note: you can call other steps like methods
end

step :second_step do
  puts "second_step"
  third_step
end

step :third_step do
  puts "third_step"
end

And then use the `flow` command line tool to run a step. Example:

$ flow first_step

Note: By default the `flow` command line tool reads in the `Flowfile`.
Use `-f/--flowfile` option to use a different file.

Some Backstage Internals / Inside Flowfiles

If you read in a `Flowfile` the flow machinery
builds a new (regular) class derived from `Flow::Base`
and every step becomes a (regular) method. Example:

require 'flow-lite'

flowfile = Flow::Flowfile.load( <<TXT )
  step :hello do
    puts "Hello, world!"
  end

  step :hola do
    puts "¡Hola, mundo!"
  end
TXT

flow = flowfile.flow   # (auto-)builds a flow class (see Note 1)
                       # and constructs/returns an instance
flow.hello             #=> "Hello, world!"
flow.hola              #=> "¡Hola, mundo!"

# or use ruby's (regular) message/metaprogramming machinery
flow.send( :hello )    #=> "Hello, world!"
flow.send( :hola  )    #=> "¡Hola, mundo!"
# or try
flow.class.instance_methods.grep( /^step_/ ) #=> [:step_hello, :step_hola]
# ...

Note 1: The Flowfile "source / configuration":

step :hello do
  puts "Hello, world!"
end

step :hola do
  puts "¡Hola, mundo!"
end

gets used to (auto-) build (via metaprogramming) a flow class like:

class Greeter < Flow::Base
  def hello
    puts "Hello, world!"
  end
  alias_method :step_hello, :hello

  def hola
    puts "¡Hola, mundo!"
  end
  alias_method :step_hola, :hola
end

Thanks a million for... !

···

Sent from my iPhone

On Oct 23, 2020, at 9:52 AM, Gerald Bauer <gerald.bauer@gmail.com> wrote:

Hello,

  I have bundled up in the flow-lite gem [1] - a lite (lightweight)
workflow engine that let's you define your workflow steps in Flowfiles (in ruby)
and includes the flow command line tool.

The original itch / need / inspiration was / is the use in GitHub
Actions (Workflows).

Happy automating with ruby. Cheers. Prost.

[1] https://github.com/rubycoco/git/tree/master/flow-lite

PS: From the readme - Usage:

Define the workflow steps in a Flowfile. Example:

step :first_step do
 puts "first_step"
 second_step    # note: you can call other steps like methods
end

step :second_step do
 puts "second_step"
 third_step
end

step :third_step do
 puts "third_step"
end

And then use the `flow` command line tool to run a step. Example:

$ flow first_step

Note: By default the `flow` command line tool reads in the `Flowfile`.
Use `-f/--flowfile` option to use a different file.

Some Backstage Internals / Inside Flowfiles

If you read in a `Flowfile` the flow machinery
builds a new (regular) class derived from `Flow::Base`
and every step becomes a (regular) method. Example:

require 'flow-lite'

flowfile = Flow::Flowfile.load( <<TXT )
 step :hello do
   puts "Hello, world!"
 end

 step :hola do
   puts "¡Hola, mundo!"
 end
TXT

flow = flowfile.flow   # (auto-)builds a flow class (see Note 1)
                      # and constructs/returns an instance
flow.hello             #=> "Hello, world!"
flow.hola              #=> "¡Hola, mundo!"

# or use ruby's (regular) message/metaprogramming machinery
flow.send( :hello )    #=> "Hello, world!"
flow.send( :hola  )    #=> "¡Hola, mundo!"
# or try
flow.class.instance_methods.grep( /^step_/ ) #=> [:step_hello, :step_hola]
# ...

Note 1: The Flowfile "source / configuration":

step :hello do
 puts "Hello, world!"
end

step :hola do
 puts "¡Hola, mundo!"
end

gets used to (auto-) build (via metaprogramming) a flow class like:

class Greeter < Flow::Base
 def hello
   puts "Hello, world!"
 end
 alias_method :step_hello, :hello

 def hola
   puts "¡Hola, mundo!"
 end
 alias_method :step_hola, :hola
end

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