IdEst – ID3 Editing and Scripting Tool (split by section):   Section:   Chapter:FastBack: Scripting   Up: Scripting   FastForward: Backups   Contents: Table of ContentsIndex: Concept Index

10.2 Using Scripts to Modify ID3 Frames

This section illustrates how to write scripts that modify ID3 tags. We will write a script which creates a new value for the ‘title’ (TIT2) frame from the name of the input file. The title is created using the following algorithm:

  1. Strip off leading directories and the ‘.mp3’ suffix.
  2. Replace underscores with spaces.

Here is the implementation: 

;; settitle.scm - set title (TIT2) frame based on
;; the file name.

(use-modules (ice-9 regex)
	     (srfi srfi-13))

(define (idest-main file frames)
  (cond
   ((string-match "(.*)\\.mp3" file) =>
    (lambda (match)
      (cons
       (cons "TIT2"
	     (list
	      (cons
	       'text
	       (string-map
		(lambda (c)
		  (if (char=? c #\_) #\space c))
		(match:substring match 1)))))
       ;;
       (filter
	(lambda (elt)
	  (not (string=? (car elt) "TIT2")))
	frames))))
   (else
    #f)))

(set! idest-readonly #f)

An example of using this script on all files in the current directory: 

$ idest --script settitle *.mp3

IdEst – ID3 Editing and Scripting Tool (split by section):   Section:   Chapter:FastBack: Scripting   Up: Scripting   FastForward: Backups   Contents: Table of ContentsIndex: Concept Index

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