Capistrano/Capifony: ask tag or revision hash before a deploy.

deploy.rb

set :branch, "master"

task :set_branch_revision do
    default_tag = `git tag`.split("\n").last
    tag = Capistrano::CLI.ui.ask "Tag to deploy (make sure to push the tag first): [#{default_tag}] "

    if tag.empty?
        default_revision = `git log origin/#{branch} -n 1 --pretty=format:%H`
        default_short_revision = default_revision[0, 10]
        revision = Capistrano::CLI.ui.ask "Revision to deploy (on branch #{branch}): [#{default_short_revision}] "
        revision = default_revision if revision.empty?
        set :revision, revision
    end

    tag = branch if tag.empty?
    set :branch, tag
    puts "Tag #{branch} revision #{revision}"
end

before :deploy, 'set_branch_revision'