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require "foreman"
# Reads and writes Procfiles
#
# A valid Procfile entry is captured by this regex:
#
# /^([A-Za-z0-9_-]+):\s*(.+)$/
#
# All other lines are ignored.
#
class Foreman::Procfile
EmptyFileError = Class.new(StandardError)
# Initialize a Procfile
#
# @param [String] filename (nil) An optional filename to read from
#
def initialize(filename=nil)
@entries = []
load(filename) if filename
end
# Yield each +Procfile+ entry in order
#
def entries
@entries.each do |(name, command)|
yield name, command
end
end
# Retrieve a +Procfile+ command by name
#
# @param [String] name The name of the Procfile entry to retrieve
#
def [](name)
if entry = @entries.detect { |n,c| name == n }
entry.last
end
end
# Create a +Procfile+ entry
#
# @param [String] name The name of the +Procfile+ entry to create
# @param [String] command The command of the +Procfile+ entry to create
#
def []=(name, command)
delete name
@entries << [name, command]
end
# Remove a +Procfile+ entry
#
# @param [String] name The name of the +Procfile+ entry to remove
#
def delete(name)
@entries.reject! { |n,c| name == n }
end
# Load a Procfile from a file
#
# @param [String] filename The filename of the +Procfile+ to load
#
def load(filename)
parse_data = parse(filename)
raise EmptyFileError if parse_data.empty?
@entries.replace parse_data
end
# Save a Procfile to a file
#
# @param [String] filename Save the +Procfile+ to this file
#
def save(filename)
File.open(filename, 'w') do |file|
file.puts self.to_s
end
end
# Get the +Procfile+ as a +String+
#
def to_s
@entries.map do |name, command|
[ name, command ].join(": ")
end.join("\n")
end
private
def parse(filename)
File.read(filename).gsub("\r\n","\n").split("\n").map do |line|
if line =~ /^([A-Za-z0-9_-]+):\s*(.+)$/
[$1, $2]
end
end.compact
end
end
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