A simple filetype recognizer.
Copyright © 2006 by murphy (Kornelius Kalnbach)
License | LGPL / ask the author |
Version | 0.1 (2005-09-01) |
# determine the type of the given lang = FileType[ARGV.first] # return :plaintext if the file type is unknown lang = FileType.fetch ARGV.first, :plaintext # try the shebang line, too lang = FileType.fetch ARGV.first, :plaintext, true
Try to determine the file type of the file.
filename is a relative or absolute path to a file.
The file itself is only accessed when read_shebang is set to true. That means you can get filetypes from files that don’t exist.
# File lib/coderay/helpers/file_type.rb, line 35 35: def [] filename, read_shebang = false 36: name = File.basename filename 37: ext = File.extname(name).sub(/^\./, '') # from last dot, delete the leading dot 38: ext2 = filename.to_s[/\.(.*)/, 1] # from first dot 39: 40: type = 41: TypeFromExt[ext] || 42: TypeFromExt[ext.downcase] || 43: (TypeFromExt[ext2] if ext2) || 44: (TypeFromExt[ext2.downcase] if ext2) || 45: TypeFromName[name] || 46: TypeFromName[name.downcase] 47: type ||= shebang(filename) if read_shebang 48: 49: type 50: end
This works like Hash#fetch.
If the filetype cannot be found, the default value is returned.
# File lib/coderay/helpers/file_type.rb, line 70 70: def fetch filename, default = nil, read_shebang = false 71: if default and block_given? 72: warn 'block supersedes default value argument' 73: end 74: 75: unless type = self[filename, read_shebang] 76: return yield if block_given? 77: return default if default 78: raise UnknownFileType, 'Could not determine type of %p.' % filename 79: end 80: type 81: end
# File lib/coderay/helpers/file_type.rb, line 52 52: def shebang filename 53: begin 54: File.open filename, 'r' do |f| 55: if first_line = f.gets 56: if type = first_line[TypeFromShebang] 57: type.to_sym 58: end 59: end 60: end 61: rescue IOError 62: nil 63: end 64: end
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