-;;;; predefined-fretboards.scm
+;;;; This file is part of LilyPond, the GNU music typesetter.
;;;;
-;;;; source file of the GNU LilyPOnd music typesetter
+;;;; Copyright (C) 2008--2015 Carl D. Sorensen <c_sorensen@byu.edu>
;;;;
-;;;; (c) 2008 Carl D. Sorensen <c_sorensen@byu.edu>
+;;;; LilyPond is free software: you can redistribute it and/or modify
+;;;; it under the terms of the GNU General Public License as published by
+;;;; the Free Software Foundation, either version 3 of the License, or
+;;;; (at your option) any later version.
+;;;;
+;;;; LilyPond is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;;; GNU General Public License for more details.
+;;;;
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
(define-public (parse-terse-string terse-definition)
-"Parse a fret-diagram-terse definition string @code{terse-definition} and
-return a marking list, which can be used as with a fretboard grob."
- (cdr (fret-parse-terse-definition-string (list '()) terse-definition)))
-
-(define-public (get-chord-shape shape-code base-chord-shapes)
-"Return the chord shape associated with key @code{shape-code} in
-the alist @code{base-chord-shapes}."
- (assoc-get shape-code base-chord-shapes #f))
-
-(define-public (offset-fret fret-offset terse-string)
-"Add @code{fret-offset} to each fret indication in @code{terse-string}
-and return the resulting fret-diagram-terse definition string."
-
- (define (split-fretstring fret-string)
- (map (lambda (x) (split-item x))
- (string-split fret-string #\sp )))
-
- (define (split-item item-string)
- (string-split item-string #\- ))
-
- (define (split-terse-string terse-string)
- (let ((long-list
- (string-split terse-string #\;)))
- (map (lambda (x) (split-fretstring x))
- (list-head long-list (1- (length long-list))))))
-
- (define (join-terse-string terse-string-list)
- (string-join
- (map (lambda (x) (join-fretstring x)) terse-string-list)
- ";" 'suffix))
-
- (define (join-item item-list)
- (string-join item-list "-" ))
-
- (define (join-fretstring fretstring-list)
- (string-join
- (map (lambda (x) (join-item x)) fretstring-list)
- " " ))
-
- (define (add-item-fret-offset fret-offset item-list)
- (let ((fretval (string->number (car item-list))))
- (if fretval
- (cons (number->string (+ fretval fret-offset))
- (cdr item-list))
- item-list)))
-
- (define (add-fretstring-fret-offset fret-offset fretstring-list)
- (map (lambda (x) (add-item-fret-offset fret-offset x))
- fretstring-list))
-
- (define (add-terse-fret-offset fret-offset terse-string-list)
- (map (lambda (x) (add-fretstring-fret-offset fret-offset x))
- terse-string-list))
-
-;; body
- (join-terse-string
- (add-terse-fret-offset
- fret-offset
- (split-terse-string terse-string))))
-
+ "Parse a @code{fret-diagram-terse} definition string @var{terse-definition}
+and return a marking list, which can be used with a fretboard grob."
+ (cdr (fret-parse-terse-definition-string (list '()) terse-definition)))
+
+(define-public (get-chord-shape shape-code tuning base-chord-shapes)
+ "Return the chord shape associated with @var{shape-code} and
+@var{tuning} in the hash-table @var{base-chord-shapes}."
+ (let ((hash-handle (hash-get-handle base-chord-shapes
+ (cons shape-code tuning))))
+ (if hash-handle
+ (cdr hash-handle)
+ '())))
+
+(define-public (offset-fret fret-offset diagram-definition)
+ "Add @var{fret-offset} to each fret indication in
+@var{diagram-definition} and return the resulting verbose
+@code{fret-diagram-definition}."
+ (let ((verbose-definition
+ (if (string? diagram-definition)
+ (parse-terse-string diagram-definition)
+ diagram-definition)))
+ (map (lambda (item)
+ (let* ((code (car item))
+ (nth (assq-ref '((barre . 3) (capo . 1) (place-fret . 2))
+ code)))
+ (if nth
+ ;; offset nth element of item by offset-fret
+ ;; without modifying the original list but
+ ;; sharing its tail
+ (let ((tail (list-tail item nth)))
+ (append! (list-head item nth)
+ (cons (+ (car tail) fret-offset)
+ (cdr tail))))
+ item)))
+ verbose-definition)))