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 def [] filename, read_shebang = false name = File.basename filename ext = File.extname(name).sub(/^\./, '') # from last dot, delete the leading dot ext2 = filename.to_s[/\.(.*)/, 1] # from first dot type = TypeFromExt[ext] || TypeFromExt[ext.downcase] || (TypeFromExt[ext2] if ext2) || (TypeFromExt[ext2.downcase] if ext2) || TypeFromName[name] || TypeFromName[name.downcase] type ||= type_from_shebang(filename) if read_shebang type 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 def fetch filename, default = nil, read_shebang = false if default && block_given? warn 'Block supersedes default value argument; use either.' end if type = self[filename, read_shebang] type else return yield if block_given? return default if default raise UnknownFileType, 'Could not determine type of %p.' % filename end end
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