Rake Cheat Sheet
Table of Contents
Rules
Computing one or more dependencies
Example: You have a source file (e.g., Markdown) that, when converted,
produces an output file in an “html” subdirectory. The normal Rake rule
syntax doesn’t support that. Instead, use a proc inside an array, to
calculate the name of the source file (dependency) from the target file.
rule /^html\/.*\.html$/ => [
proc { |task_name| task_name.sub(/^html./, '').sub(/\.html$/, '.md') }
] do |t|
markdown(t.source, t.name)
end
For readability, the Proc can be factored into a function:
def html_to_md
Proc.new {|task_name| task_name.sub(/^html./, '').sub(/\.html$/, '.md')}
end
rule /^html\/.*\.html$/ => [html_to_md, CHEAT_SHEET_TEMPLATE] do |t|
markdown(t.source, t.name)
end