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Mini Shell
#!/opt/alt/ruby20/bin/ruby
# Tiny eRuby --- ERB2
# Copyright (c) 1999-2000,2002 Masatoshi SEKI
# You can redistribute it and/or modify it under the same terms as Ruby.
require 'erb'
class ERB
module Main
def ARGV.switch
return nil if self.empty?
arg = self.shift
return nil if arg == '--'
if arg =~ /^-(.)(.*)/
if $1 == '-'
arg, @maybe_arg = arg.split(/=/, 2)
return arg
end
raise 'unknown switch "-"' if $2[0] == ?- and $1 != 'T'
if $2.size > 0
self.unshift "-#{$2}"
@maybe_arg = $2
else
@maybe_arg = nil
end
"-#{$1}"
else
self.unshift arg
nil
end
end
def ARGV.req_arg
(@maybe_arg || self.shift || raise('missing argument')).tap {
@maybe_arg = nil
}
end
def trim_mode_opt(trim_mode, disable_percent)
return trim_mode if disable_percent
case trim_mode
when 0
return '%'
when 1
return '%>'
when 2
return '%<>'
when '-'
return '%-'
end
end
module_function :trim_mode_opt
def run(factory=ERB)
trim_mode = 0
disable_percent = false
begin
while switch = ARGV.switch
case switch
when '-x' # ruby source
output = true
when '-n' # line number
number = true
when '-v' # verbose
$VERBOSE = true
when '--version' # version
STDERR.puts factory.version
exit
when '-d', '--debug' # debug
$DEBUG = true
when '-r' # require
require ARGV.req_arg
when '-S' # security level
arg = ARGV.req_arg
raise "invalid safe_level #{arg.dump}" unless arg =~ /^[0-4]$/
safe_level = arg.to_i
when '-T' # trim mode
arg = ARGV.req_arg
if arg == '-'
trim_mode = arg
next
end
raise "invalid trim mode #{arg.dump}" unless arg =~ /^[0-2]$/
trim_mode = arg.to_i
when '-E', '--encoding'
arg = ARGV.req_arg
set_encoding(*arg.split(/:/, 2))
when '-U'
set_encoding(Encoding::UTF_8, Encoding::UTF_8)
when '-P'
disable_percent = true
when '--help'
raise "print this help"
else
raise "unknown switch #{switch.dump}"
end
end
rescue # usage
STDERR.puts $!.to_s
STDERR.puts File.basename($0) +
" [switches] [inputfile]"
STDERR.puts <<EOU
-x print ruby script
-n print ruby script with line number
-v enable verbose mode
-d set $DEBUG to true
-r library load a library
-S safe_level set $SAFE (0..4)
-E ex[:in] set default external/internal encodings
-U set default encoding to UTF-8.
-T trim_mode specify trim_mode (0..2, -)
-P ignore lines which start with "%"
EOU
exit 1
end
$<.set_encoding(Encoding::ASCII_8BIT, nil)
src = $<.read
filename = $FILENAME
exit 2 unless src
trim = trim_mode_opt(trim_mode, disable_percent)
erb = factory.new(src.untaint, safe_level, trim)
erb.filename = filename
if output
if number
erb.src.each_line.with_index do |line, l|
puts "%3d %s"%[l+1, line]
end
else
puts erb.src
end
else
erb.run(TOPLEVEL_BINDING.taint)
end
end
module_function :run
def set_encoding(extern, intern = nil)
verbose, $VERBOSE = $VERBOSE, nil
Encoding.default_external = extern unless extern.nil? || extern.empty?
Encoding.default_internal = intern unless intern.nil? || intern.empty?
[$stdin, $stdout, $stderr].each do |io|
io.set_encoding(extern, intern)
end
ensure
$VERBOSE = verbose
end
module_function :set_encoding
class << self; private :set_encoding; end
end
end
if __FILE__ == $0
ERB::Main.run
end
Zerion Mini Shell 1.0