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module Hirb
# Group of handy utility functions used throughout Hirb.
module Util
extend self
# Returns a constant like Module#const_get no matter what namespace it's nested in.
# Returns nil if the constant is not found.
def any_const_get(name)
return name if name.is_a?(Module)
begin
klass = Object
name.split('::').each {|e|
klass = klass.const_get(e)
}
klass
rescue
nil
end
end
# Recursively merge hash1 with hash2.
def recursive_hash_merge(hash1, hash2)
hash1.merge(hash2) {|k,o,n| (o.is_a?(Hash)) ? recursive_hash_merge(o,n) : n}
end
# From Rails ActiveSupport, converting undescored lowercase to camel uppercase.
def camelize(string)
string.to_s.gsub(/\/(.?)/) { "::#{$1.upcase}" }.gsub(/(?:^|_)(.)/) { $1.upcase }
end
# Used by Hirb::Menu to select items from an array. Array counting starts at 1. Ranges of numbers are specified with a '-' or '..'.
# Multiple ranges can be comma delimited. Anything that isn't a valid number is ignored. All elements can be returned with a '*'.
# Examples:
# 1-3,5-6 -> [1,2,3,5,6]
# * -> all elements in array
# '' -> []
def choose_from_array(array, input, options={})
options = {:splitter=>","}.merge(options)
return array if input[/^\s*\*/]
result = []
input.split(options[:splitter]).each do |e|
if e =~ /-|\.\./
min,max = e.split(/-|\.\./)
slice_min = min.to_i - 1
result.push(*array.slice(slice_min, max.to_i - min.to_i + 1))
elsif e =~ /\s*(\d+)\s*/
index = $1.to_i - 1
next if index < 0
result.push(array[index]) if array[index]
end
end
result
end
# Determines if a shell command exists by searching for it in ENV['PATH'].
def command_exists?(command)
ENV['PATH'].split(File::PATH_SEPARATOR).any? {|d| File.exist? File.join(d, command) }
end
# Returns [width, height] of terminal when detected, nil if not detected.
# Think of this as a simpler version of Highline's Highline::SystemExtensions.terminal_size()
def detect_terminal_size
if (ENV['COLUMNS'] =~ /^\d+$/) && (ENV['LINES'] =~ /^\d+$/)
[ENV['COLUMNS'].to_i, ENV['LINES'].to_i]
elsif (RUBY_PLATFORM =~ /java/ || (!STDIN.tty? && ENV['TERM'])) && command_exists?('tput')
[`tput cols`.to_i, `tput lines`.to_i]
elsif STDIN.tty? && command_exists?('stty')
`stty size`.scan(/\d+/).map { |s| s.to_i }.reverse
else
nil
end
rescue
nil
end
# Captures STDOUT of anything run in its block and returns it as string.
def capture_stdout(&block)
original_stdout = $stdout
$stdout = fake = StringIO.new
begin
yield
ensure
$stdout = original_stdout
end
fake.string
end
# From Rubygems, determine a user's home.
def find_home
['HOME', 'USERPROFILE'].each {|e| return ENV[e] if ENV[e] }
return "#{ENV['HOMEDRIVE']}#{ENV['HOMEPATH']}" if ENV['HOMEDRIVE'] && ENV['HOMEPATH']
File.expand_path("~")
rescue
File::ALT_SEPARATOR ? "C:/" : "/"
end
end
end
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