v1_9_3_125 - Show latest stable - 0 notes - Class: String
pathmap(spec=nil, &block) public

Map the path according to the given specification. The specification controls the details of the mapping. The following special patterns are recognized:

  • %p – The complete path.

  • %f – The base file name of the path, with its file extension,

but without any directories.
  • %n – The file name of the path without its file extension.

  • %d – The directory list of the path.

  • %x – The file extension of the path. An empty string if there

is no extension.
  • %X – Everything but the file extension.

  • %s – The alternate file separator if defined, otherwise use

the standard file separator.
  • %% – A percent sign.

The %d specifier can also have a numeric prefix (e.g. ‘%2d’). If the number is positive, only return (up to) n directories in the path, starting from the left hand side. If n is negative, return (up to) |n| directories from the right hand side of the path.


'a/b/c/d/file.txt'.pathmap("%2d")   => 'a/b'
'a/b/c/d/file.txt'.pathmap("%-2d")  => 'c/d'

Also the %d, %p, %f, %n, %x, and %X operators can take a pattern/replacement argument to perform simple string substitutions on a particular part of the path. The pattern and replacement are separated by a comma and are enclosed by curly braces. The replacement spec comes after the % character but before the operator letter. (e.g. “%{old,new}d”). Multiple replacement specs should be separated by semi-colons (e.g. “%{old,new;src,bin}d”).

Regular expressions may be used for the pattern, and back refs may be used in the replacement text. Curly braces, commas and semi-colons are excluded from both the pattern and replacement text (let’s keep parsing reasonable).

For example:




If the replacement text is ‘*’, then a block may be provided to perform some arbitrary calculation for the replacement.

For example:

"/path/to/file.TXT".pathmap("%X%{.*,*}x") { |ext|



Show source
Register or log in to add new notes.