A simple filetype recognizer.
# determine the type of the given lang = FileType[file_name] # return :text if the file type is unknown lang = FileType.fetch file_name, :text # try the shebang line, too lang = FileType.fetch file_name, :text, 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 29 29: def [] filename, read_shebang = false 30: name = File.basename filename 31: ext = File.extname(name).sub(/^\./, '') # from last dot, delete the leading dot 32: ext2 = filename.to_s[/\.(.*)/, 1] # from first dot 33: 34: type = 35: TypeFromExt[ext] || 36: TypeFromExt[ext.downcase] || 37: (TypeFromExt[ext2] if ext2) || 38: (TypeFromExt[ext2.downcase] if ext2) || 39: TypeFromName[name] || 40: TypeFromName[name.downcase] 41: type ||= shebang(filename) if read_shebang 42: 43: type 44: 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 50 50: def fetch filename, default = nil, read_shebang = false 51: if default && block_given? 52: warn 'Block supersedes default value argument; use either.' 53: end 54: 55: if type = self[filename, read_shebang] 56: type 57: else 58: return yield if block_given? 59: return default if default 60: raise UnknownFileType, 'Could not determine type of %p.' % filename 61: end 62: end
# File lib/coderay/helpers/file_type.rb, line 66 66: def shebang filename 67: return unless File.exist? filename 68: File.open filename, 'r' do |f| 69: if first_line = f.gets 70: if type = first_line[TypeFromShebang] 71: type.to_sym 72: end 73: end 74: end 75: end
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