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require 'tempfile'
class Thor
module Shell
class Basic
attr_accessor :base, :padding
# Initialize base and padding to nil.
#
def initialize #:nodoc:
@base, @padding = nil, 0
end
# Sets the output padding, not allowing less than zero values.
#
def padding=(value)
@padding = [0, value].max
end
# Ask something to the user and receives a response.
#
# ==== Example
# ask("What is your name?")
#
def ask(statement, color=nil)
say("#{statement} ", color)
$stdin.gets.strip
end
# Say (print) something to the user. If the sentence ends with a whitespace
# or tab character, a new line is not appended (print + flush). Otherwise
# are passed straight to puts (behavior got from Highline).
#
# ==== Example
# say("I know you knew that.")
#
def say(message="", color=nil, force_new_line=(message.to_s !~ /( |\t)$/))
message = message.to_s
message = set_color(message, color) if color
if force_new_line
$stdout.puts(message)
else
$stdout.print(message)
$stdout.flush
end
end
# Say a status with the given color and appends the message. Since this
# method is used frequently by actions, it allows nil or false to be given
# in log_status, avoiding the message from being shown. If a Symbol is
# given in log_status, it's used as the color.
#
def say_status(status, message, log_status=true)
return if quiet? || log_status == false
spaces = " " * (padding + 1)
color = log_status.is_a?(Symbol) ? log_status : :green
status = status.to_s.rjust(12)
status = set_color status, color, true if color
say "#{status}#{spaces}#{message}", nil, true
end
# Make a question the to user and returns true if the user replies "y" or
# "yes".
#
def yes?(statement, color=nil)
ask(statement, color) =~ is?(:yes)
end
# Make a question the to user and returns true if the user replies "n" or
# "no".
#
def no?(statement, color=nil)
!yes?(statement, color)
end
# Prints a list of items.
#
# ==== Parameters
# list<Array[String, String, ...]>
#
# ==== Options
# mode:: Can be :rows or :inline. Defaults to :rows.
# ident:: Ident each item with the value given.
#
def print_list(list, options={})
return if list.empty?
ident = " " * (options[:ident] || 0)
content = case options[:mode]
when :inline
last = list.pop
"#{list.join(", ")}, and #{last}"
else # rows
ident + list.join("\n#{ident}")
end
$stdout.puts content
end
# Prints a table.
#
# ==== Parameters
# Array[Array[String, String, ...]]
#
# ==== Options
# ident<Integer>:: Ident the first column by ident value.
#
def print_table(table, options={})
return if table.empty?
formats = []
0.upto(table.first.length - 2) do |i|
maxima = table.max{ |a,b| a[i].size <=> b[i].size }[i].size
formats << "%-#{maxima + 2}s"
end
formats[0] = formats[0].insert(0, " " * options[:ident]) if options[:ident]
formats << "%s"
table.each do |row|
row.each_with_index do |column, i|
$stdout.print formats[i] % column.to_s
end
$stdout.puts
end
end
# Deals with file collision and returns true if the file should be
# overwriten and false otherwise. If a block is given, it uses the block
# response as the content for the diff.
#
# ==== Parameters
# destination<String>:: the destination file to solve conflicts
# block<Proc>:: an optional block that returns the value to be used in diff
#
def file_collision(destination)
return true if @always_force
options = block_given? ? "[Ynaqdh]" : "[Ynaqh]"
while true
answer = ask %[Overwrite #{destination}? (enter "h" for help) #{options}]
case answer
when is?(:yes), is?(:force)
return true
when is?(:no), is?(:skip)
return false
when is?(:always)
return @always_force = true
when is?(:quit)
say 'Aborting...'
raise SystemExit
when is?(:diff)
show_diff(destination, yield) if block_given?
say 'Retrying...'
else
say file_collision_help
end
end
end
# Called if something goes wrong during the execution. This is used by Thor
# internally and should not be used inside your scripts. If someone went
# wrong, you can always raise an exception. If you raise a Thor::Error, it
# will be rescued and wrapped in the method below.
#
def error(statement)
$stderr.puts statement
end
# Apply color to the given string with optional bold. Disabled in the
# Thor::Shell::Basic class.
#
def set_color(string, color, bold=false) #:nodoc:
string
end
protected
def is?(value) #:nodoc:
value = value.to_s
if value.size == 1
/\A#{value}\z/i
else
/\A(#{value}|#{value[0,1]})\z/i
end
end
def file_collision_help #:nodoc:
<<HELP
Y - yes, overwrite
n - no, do not overwrite
a - all, overwrite this and all others
q - quit, abort
d - diff, show the differences between the old and the new
h - help, show this help
HELP
end
def show_diff(destination, content) #:nodoc:
diff_cmd = ENV['THOR_DIFF'] || ENV['RAILS_DIFF'] || 'diff -u'
Tempfile.open(File.basename(destination), File.dirname(destination)) do |temp|
temp.write content
temp.rewind
system %(#{diff_cmd} "#{destination}" "#{temp.path}")
end
end
def quiet? #:nodoc:
base && base.options[:quiet]
end
end
end
end
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