Adjust rhythms of passages filtered with `yank`

[WolfgangDrescher]

This is related to https://github.com/humdrum-tools/verovio-humdrum-viewer/issues/779.

I'm filtering passages marked manually as cadences (!! cadence start/end) with the yank command.

Is it possible to fix the output by yank so the result becomes a valid kern score? At the beginning there are beats missing when a voice begins with a null token. At the end there are beats missing when a voice has a longer note duration than the other voices (note duration is longer than the duration of the last line/slice when comparing with beat -p -d -n -u 1).

I just posted a similar issue for the myank filter: https://github.com/humdrum-tools/verovio-humdrum-viewer/issues/780. Would it be a better solution not to fix the yank command but implement this feature into the myank filter and support not only measure range selection but also allow to pass line ranges (e.g. myank -l 181-187)?

Examples

Source file: https://verovio.humdrum.org/?file=https://raw.githubusercontent.com/WolfgangDrescher/lassus-geistliche-psalmen/master/kern/01-beatus-vir.krn (comments with the cadences are not yet commited)

Missing durations at end of yanked passage

yank -l -r 181-187

VHV

**kern	**text	**kern	**text	**kern	**text
*staff3	*staff3	*staff2	*staff2	*staff1	*staff1
*Ivox	*	*Ivox	*	*Ivox	*
*I"Bassus	*	*I"Tenor	*	*I"Cantus	*
*I'B	*	*I'T	*	*I'C	*
*clefC3	*	*clefC2	*	*clefG2	*
*k[]	*	*k[]	*	*k[]	*
*C:ion	*	*C:ion	*	*C:ion	*
*M2/1	*	*M2/1	*	*M2/1	*
*met(C|)	*	*met(C|)	*	*met(C|)	*
*MM180	*	*MM180	*	*MM180	*
*	*	*	*	*	*ij
*	*	*	*	*	*Xij
*	*	*	*ij	*	*
1r	.	2f	weiß	4a	.
.	.	.	.	4b	.
.	.	2e	zu	1cc	.
1G	zu	1d	spot-	.	.
.	.	.	.	2b	zu
=27	=27	=27	=27	=27	=27
2.A	spot-	2c	ten/	2.cc	spot-
*-	*-	*-	*-	*-	*-

Expected output

VHV

**kern	**text	**kern	**text	**kern	**text
*staff3	*staff3	*staff2	*staff2	*staff1	*staff1
*Ivox	*	*Ivox	*	*Ivox	*
*I"Bassus	*	*I"Tenor	*	*I"Cantus	*
*I'B	*	*I'T	*	*I'C	*
*clefC3	*	*clefC2	*	*clefG2	*
*k[]	*	*k[]	*	*k[]	*
*C:ion	*	*C:ion	*	*C:ion	*
*M2/1	*	*M2/1	*	*M2/1	*
*met(C|)	*	*met(C|)	*	*met(C|)	*
*MM180	*	*MM180	*	*MM180	*
*	*	*	*	*	*ij
*	*	*	*	*	*Xij
*	*	*	*ij	*	*
1r	.	2f	weiß	4a	.
.	.	.	.	4b	.
.	.	2e	zu	1cc	.
1G	zu	1d	spot-	.	.
.	.	.	.	2b	zu
=27	=27	=27	=27	=27	=27
2.A	spot-	2c	ten/	2.cc	spot-
.	.	4s	.	.	.
*-	*-	*-	*-	*-	*-

Missing durations at beginning (and end) of yanked passage

yank -l -r 49-55

VHV

**kern	**text	**kern	**text	**kern	**text
*staff3	*staff3	*staff2	*staff2	*staff1	*staff1
*Ivox	*	*Ivox	*	*Ivox	*
*I"Bassus	*	*I"Tenor	*	*I"Cantus	*
*I'B	*	*I'T	*	*I'C	*
*clefC3	*	*clefC2	*	*clefG2	*
*k[]	*	*k[]	*	*k[]	*
*C:ion	*	*C:ion	*	*C:ion	*
*M2/1	*	*M2/1	*	*M2/1	*
*met(C|)	*	*met(C|)	*	*met(C|)	*
*MM180	*	*MM180	*	*MM180	*
*	*	*	*	*	*ij
2c	.	.	.	4g	der
.	.	.	.	4a	.
=6	=6	=6	=6	=6	=6
1G	mann/	1d	der	4b	.
.	.	.	.	4cc	.
.	.	.	.	2b	.
2r	.	1c	mann/	2cc	mann/
*-	*-	*-	*-	*-	*-

Expected output

VHV

**kern	**text	**kern	**text	**kern	**text
*staff3	*staff3	*staff2	*staff2	*staff1	*staff1
*Ivox	*	*Ivox	*	*Ivox	*
*I"Bassus	*	*I"Tenor	*	*I"Cantus	*
*I'B	*	*I'T	*	*I'C	*
*clefC3	*	*clefC2	*	*clefG2	*
*k[]	*	*k[]	*	*k[]	*
*C:ion	*	*C:ion	*	*C:ion	*
*M2/1	*	*M2/1	*	*M2/1	*
*met(C|)	*	*met(C|)	*	*met(C|)	*
*MM180	*	*MM180	*	*MM180	*
*	*	*	*	*	*ij
2c	.	2e]	.	4g	der
.	.	.	.	4a	.
=6	=6	=6	=6	=6	=6
1G	mann/	1d	der	4b	.
.	.	.	.	4cc	.
.	.	.	.	2b	.
2r	.	1c	mann/	2cc	mann/
2s	.	.	.	2s	.
*-	*-	*-	*-	*-	*-

[WolfgangDrescher]

Interestingly, it is possible to render the invalid kern file with verovio, even when the VHV has no output:

The problems described in https://github.com/humdrum-tools/verovio-humdrum-viewer/issues/780 also occur here.

[craigsapp]

I just posted a similar issue for the myank filter: https://github.com/humdrum-tools/verovio-humdrum-viewer/issues/780. Would it be a better solution not to fix the yank command but implement this feature into the myank filter and support not only measure range selection but also allow to pass line ranges (e.g. myank -l 181-187)?

Yes, yank is written in AWK which I can read but not write (so it is difficult for me to enhance awk scripts).

[WolfgangDrescher]

I startet a PR as a draft to add line range selection to myank in https://github.com/craigsapp/humlib/pull/55. Probably not the best solution, but it's a start. Any feedback welcome.