color scheme (syntax highlighting vim Fedora 22)

[Kevin Tough]

Hi others and Pierre,

They or someone has changed the syntax highlighting colors in Fedora 22.
I hope it was not you Pierre. I find the syntax highlighting terrible on
my notebook.
I don't know if users of this list can effect any changes so parallel I
will try to contact someone in their development team.

Namaste,
Kevin


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Re: [savannah-help-public] Google Code will be no more at 2016-01-25

[Trevor Daniels]

Assaf Gordon wrote Saturday, March 14, 2015 12:59 AM


> On 03/13/2015 07:33 PM, Trevor Daniels wrote:
>> All the text in the issues can be extracted as a 5MB JSON file, but the file 
>> does not include the images.  At present I know of no way to extract the 
>> images in bulk.  Individual ones can be downloaded of course.
>>
>> I can send you a copy of the JSON file off-list if that would help.  It does 
>> include a marker for the images.
> 
> Please do.

Sent off-list.

> By "marker" do you mean a URL ?

No, it's just an internal reference, like this:

"attachments" : [ {
  "attachmentId" : "40050007000",
  "fileName" : "Screenshot.png",
  "fileSize" : 137527,
  "mimetype" : "image/png"
} ]

This is included in Issue 4005, see
https://code.google.com/p/lilypond/issues/detail?id=4005

Thanks for taking a look, Trevor

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Re: Slurs

[Trevor Daniels]

Daniel you wrote Saturday, March 14, 2015 12:17 AM


> I’m typesetting an aria that has several melismatic 
> passages with smaller, individually slurred phrases
> over single syllables. Using automatic text setting
> obviously won’t work here. I’d rather not set the
> lyrics with manual durations because the majority
> of the score doesn’t require it. The only other
> solution I can think of is to hide the slurs in
> these passages and simultaneously use phrasing
> slurs, but this also would be rather cumbersome.
> Any suggestions for an easier, more elegant solution?

I'm not sure I understand exactly what you want here
(a small example showing the problem will always
result in a greater number of more helpful responses)
but there are other ways of indicating a melisma.
Perhaps the one you want is the single underscore in
the lyrics.  See the last one in
http://www.lilypond.org/doc/v2.19/Documentation/notation/common-notation-for-vocal-music#multiple-notes-to-one-syllable

Trevor
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Re: divisi staves and notehead merge (issue 3518 revisited)

[Werner LEMBERG]

> Please have a look at the `divisi-staves.ly' regression test, which
> is the solution to
> 
>   https://code.google.com/p/lilypond/issues/detail?id=3518
> 
> [Actually, this file contains undocumented features that deserves
> documentation due to its importance for orchestral music...]
> 
> I want a variation of this, namely solo violin + gli altri [...]
> Does lilypond have already a property to make the noteheads merge
> even if the stems are in the same direction?

I've just found out that adding

  \override NoteColumn.ignore-collision = ##t

does exactly the right thing, at least for the given example.  I guess
that this is just a work-around, since no real merging does happen...


  boring = \set Staff.keepAliveInterfaces = #'()
  tricky = \unset Staff.keepAliveInterfaces

  violsolo=\relative d' {
\boring \repeat unfold 100 d4
\tricky 2
\boring \repeat unfold 98 d4
\bar "|."
  }

  viol=\relative d' {
\boring \repeat unfold 100 d4
\tricky d4 d4
\boring \repeat unfold 98 d4
\bar "|."
  }

  \score {
\new StaffGroup \with { \consists "Keep_alive_together_engraver" }
<<
  \new Staff \with { instrumentName = "Violin solo"
 shortInstrumentName = "V solo"
 \override VerticalAxisGroup.remove-empty = ##t
 \override VerticalAxisGroup.remove-first = ##t
 \override VerticalAxisGroup.remove-layer = 1
   } \violsolo

  \new Staff \with { instrumentName = "Violin gli altri"
 shortInstrumentName = "V"
 \override VerticalAxisGroup.remove-empty = ##t
 \override VerticalAxisGroup.remove-first = ##t
 \override VerticalAxisGroup.remove-layer = 1
   } \viol
  \new Staff \with { instrumentName = "Violin"
 shortInstrumentName = "V"
 \override VerticalAxisGroup.remove-layer = 2
 \override NoteColumn.ignore-collision = ##t
   } << \violsolo \viol >>
>>
\layout {
  short-indent = 2\cm
  indent = 3\cm
}
  }


I will now try it in a real-world example.


Werner
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Re: divisi staves and notehead merge (issue 3518 revisited)

[Werner LEMBERG]

> I've just found out that adding
> 
>   \override NoteColumn.ignore-collision = ##t
> 
> does exactly the right thing, at least for the given example.  I
> guess that this is just a work-around, since no real merging does
> happen...

...nd a much simpler solution is as follows, just for reference.
No need to take care of collisions at all – the `unified' line simply
holds the music of `viol' only.  This works very well with real-world
music too!  Thanks again, David K., for this nice solution.


Werner


==

boring = \set Staff.keepAliveInterfaces = #'()
tricky = \unset Staff.keepAliveInterfaces

violsolo=\relative d' {
  \boring \repeat unfold 100 d4
  \tricky 2
  \boring \repeat unfold 98 d4
  \bar "|."
}

viol=\relative d' {
  \boring \repeat unfold 100 d4
  \tricky d4 d4
  \boring \repeat unfold 98 d4
  \bar "|."
}

\score {
  \new StaffGroup \with { \consists "Keep_alive_together_engraver" }
  <<
\new Staff \with { instrumentName = "Violin solo"
   shortInstrumentName = "V solo"
   \override VerticalAxisGroup.remove-empty = ##t
   \override VerticalAxisGroup.remove-first = ##t
   \override VerticalAxisGroup.remove-layer = 1
 } \violsolo

\new Staff \with { instrumentName = "Violin gli altri"
   shortInstrumentName = "V"
   \override VerticalAxisGroup.remove-empty = ##t
   \override VerticalAxisGroup.remove-first = ##t
   \override VerticalAxisGroup.remove-layer = 1
 } \viol

\new Staff \with { instrumentName = "Violin"
   shortInstrumentName = "V"
   \override VerticalAxisGroup.remove-layer = 2
 } \viol
  >>

  \layout {
short-indent = 2\cm
indent = 3\cm
  }
}
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opera written with lily performance/demo

[Jay Hamilton]

After trials and tribulations and a great deal of help from many of you 
I finished the score to my opera The Map in 2012.


www.themaptheopera.com

On the 21st of March a performance (to garner more support for a full 
production) of 5 scenes is Happening.


Thanks for the aid- truly
Jay

--
Thanks for reading
blogs at
https://learnivore.com/users/music#
www.soundand.com
www.themaptheopera.com
Jay

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Merging a markup-command with an event-function

[Pierre Perol-Schneider]

Hi,

In order to make a new guitar barré function, I'm trying to merge the
attached markup-command with an event-function (without success - problem
is on line #90):

%
\version "2.18.2"

Prefix = \markup {
  %% uncomment/comment these lines for C, C slashed, B or B slashed prefix :
  \roman C
  %\combine \roman C \translate #'(0.65 . -0.25) \override #'(thickness .
1.2) \draw-line #'(0 . 1.8)
  %\roman B
  %\combine \roman B \translate #'(0.65 . -0.25) \override #'(thickness .
1.2) \draw-line #'(0 . 1.8)
  
  \hspace #0.2
}

#(define-markup-command (prefix layout props string-qty) (integer?)
(interpret-markup layout props
  (case string-qty
((2) #{
\markup {
  \override #'(font-family . typewriter)
  \concat {
  \raise #.15
  \fontsize #-6
{
  \raise #.5 "1"
  \hspace #-.2
  \raise #.2 "/"
  \hspace #-.2
  "3"
}
\Prefix
  }
}
 #})
((3) #{
\markup {
  \override #'(font-family . typewriter)
  \concat {
  \raise #.15
  \fontsize #-6
{
  \raise #.5 "1"
  \hspace #-.2
  \raise #.2 "/"
  \hspace #-.2
  "2"
}
\Prefix
  }
}
 #})
((4) #{
\markup {
  \override #'(font-family . typewriter)
  \concat {
  \raise #.15
  \fontsize #-6
{
  \raise #.5 "2"
  \hspace #-.2
  \raise #.2 "/"
  \hspace #-.2
  "3"
}
\Prefix
  }
}
 #})
((5) #{
\markup {
  \override #'(font-family . typewriter)
  \concat {
  \raise #.15
  \fontsize #-6
{
  \raise #.5 "5"
  \hspace #-.2
  \raise #.2 "/"
  \hspace #-.2
  "6"
}
\Prefix
  }
}
 #})
(else
 #{ \markup\Prefix #}

startBarre =
#(define-event-function (parser location arg-string-qty fret-nbr) (integer?
markup?)
   ;; here's the problem ??
  (define string-qty arg-string-qty)
  ;; hereunder should be fine:
  (let* ((mrkp (markup #:upright #:concat (prefix fret-nbr
(let* ((mrkp (markup #:upright #:concat (#:lower 0.08 prefix #:lower
0.05 fret-nbr #:hspace 0.3
(define (width grob text-string)
  (let* ((layout (ly:grob-layout grob))
 (props (ly:grob-alist-chain
   grob
   (ly:output-def-lookup layout 'text-font-defaults
  (interval-length
 (ly:stencil-extent
   (interpret-markup layout props (markup text-string))
   X
#{
  \tweak TextSpanner.after-line-breaking
#(lambda (grob)
  (let* ((mrkp-width (width grob mrkp))
 (line-thickness (ly:staff-symbol-line-thickness grob)))
   (ly:grob-set-nested-property!
 grob
 '(bound-details left padding)
 (+ (/ mrkp-width -4) (* line-thickness 2)
  \tweak TextSpanner.font-size -2
  \tweak TextSpanner.style #'line
  \tweak TextSpanner.bound-details.left.text #mrkp
  \tweak TextSpanner.bound-details.left.padding 0.25
  \tweak TextSpanner.bound-details.left.attach-dir -1
  \tweak TextSpanner.bound-details.left-broken.text ##f
  \tweak TextSpanner.bound-details.left-broken.attach-dir -1
  %% adjust the numeric values to fit your needs:
  \tweak TextSpanner.bound-details.left-broken.padding 1.5
  \tweak TextSpanner.bound-details.right-broken.padding 0
  \tweak TextSpanner.bound-details.right.padding 0.25
  \tweak TextSpanner.bound-details.right.attach-dir 2
  \tweak TextSpanner.bound-details.right-broken.text ##f
  \tweak TextSpanner.bound-details.right.text
\markup \draw-line #'(0 . -1)
  \startTextSpan
#})))

stopBarre = \stopTextSpan

%% Syntax: note \startBarre #'string quantity' "text"  notes \stopBarre
(text = any fret 

Re: opera written with lily performance/demo

[Pierre Perol-Schneider]

Congrats Jay!

Cheers,
Pierre

2015-03-14 18:12 GMT+01:00 Jay Hamilton :

> After trials and tribulations and a great deal of help from many of you I
> finished the score to my opera The Map in 2012.
>
> www.themaptheopera.com
>
> On the 21st of March a performance (to garner more support for a full
> production) of 5 scenes is Happening.
>
> Thanks for the aid- truly
> Jay
>
> --
> Thanks for reading
> blogs at
> https://learnivore.com/users/music#
> www.soundand.com
> www.themaptheopera.com
> Jay
>
> ___
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> lilypond-user@gnu.org
> https://lists.gnu.org/mailman/listinfo/lilypond-user
>
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Re: Merging a markup-command with an event-function

[David Nalesnik]

Hi Pierre,

On Sat, Mar 14, 2015 at 12:42 PM, Pierre Perol-Schneider <
pierre.schneider.pa...@gmail.com> wrote:

> Hi,
>
> In order to make a new guitar barré function, I'm trying to merge the
> attached markup-command with an event-function (without success - problem
> is on line #90):
>
> %
> \version "2.18.2"
>
> Prefix = \markup {
>   %% uncomment/comment these lines for C, C slashed, B or B slashed prefix
> :
>   \roman C
>   %\combine \roman C \translate #'(0.65 . -0.25) \override #'(thickness .
> 1.2) \draw-line #'(0 . 1.8)
>   %\roman B
>   %\combine \roman B \translate #'(0.65 . -0.25) \override #'(thickness .
> 1.2) \draw-line #'(0 . 1.8)
>   
>   \hspace #0.2
> }
>
> #(define-markup-command (prefix layout props string-qty) (integer?)
> (interpret-markup layout props
>   (case string-qty
> ((2) #{
> \markup {
>   \override #'(font-family . typewriter)
>   \concat {
>   \raise #.15
>   \fontsize #-6
> {
>   \raise #.5 "1"
>   \hspace #-.2
>   \raise #.2 "/"
>   \hspace #-.2
>   "3"
> }
> \Prefix
>   }
> }
>  #})
> ((3) #{
> \markup {
>   \override #'(font-family . typewriter)
>   \concat {
>   \raise #.15
>   \fontsize #-6
> {
>   \raise #.5 "1"
>   \hspace #-.2
>   \raise #.2 "/"
>   \hspace #-.2
>   "2"
> }
> \Prefix
>   }
> }
>  #})
> ((4) #{
> \markup {
>   \override #'(font-family . typewriter)
>   \concat {
>   \raise #.15
>   \fontsize #-6
> {
>   \raise #.5 "2"
>   \hspace #-.2
>   \raise #.2 "/"
>   \hspace #-.2
>   "3"
> }
> \Prefix
>   }
> }
>  #})
> ((5) #{
> \markup {
>   \override #'(font-family . typewriter)
>   \concat {
>   \raise #.15
>   \fontsize #-6
> {
>   \raise #.5 "5"
>   \hspace #-.2
>   \raise #.2 "/"
>   \hspace #-.2
>   "6"
> }
> \Prefix
>   }
> }
>  #})
> (else
>  #{ \markup\Prefix #}
>
> startBarre =
> #(define-event-function (parser location arg-string-qty fret-nbr)
> (integer? markup?)
>;; here's the problem ??
>

Nope, the line below is fine.  However, why don't you subsume this in the
let-block?


>   (define string-qty arg-string-qty)
>   ;; hereunder should be fine:
>   (let* ((mrkp (markup #:upright #:concat (prefix fret-nbr
>

You've defined Prefix with a capital "P" above.


> (let* ((mrkp (markup #:upright #:concat (#:lower 0.08 prefix #:lower
> 0.05 fret-nbr #:hspace 0.3
>

Same problem here.  By the way, why the two assignments to mrkp?  This one
will shadow the one above.

HTH,
David
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Re: Merging a markup-command with an event-function

[Pierre Perol-Schneider]

Hi David,

2015-03-14 19:03 GMT+01:00 David Nalesnik :


> However, why don't you subsume this in the let-block?
>

I've tried to - in fact I've tried a lot of things... without succes.


>
>
>>   (define string-qty arg-string-qty)
>>   ;; hereunder should be fine:
>>   (let* ((mrkp (markup #:upright #:concat (prefix fret-nbr
>>
>
> You've defined Prefix with a capital "P" above.
>
>
>> (let* ((mrkp (markup #:upright #:concat (#:lower 0.08 prefix #:lower
>> 0.05 fret-nbr #:hspace 0.3
>>
>
> Same problem here.
>

Actually no, 'prefix' here should be the markup-command not a variable. How
can I fix that ?


> By the way, why the two assignments to mrkp?  This one will shadow the one
> above.
>

Hmm, Copy/Paste + tiredness...

Cheers,
Pierre
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Re: Merging a markup-command with an event-function

[David Nalesnik]

Hi Pierre,

On Sat, Mar 14, 2015 at 1:49 PM, Pierre Perol-Schneider <
pierre.schneider.pa...@gmail.com> wrote:

> Hi David,
>
> 2015-03-14 19:03 GMT+01:00 David Nalesnik :
>
>
>> However, why don't you subsume this in the let-block?
>>
>
> I've tried to - in fact I've tried a lot of things... without succes.
>
>
>>
>>
>>>   (define string-qty arg-string-qty)
>>>   ;; hereunder should be fine:
>>>   (let* ((mrkp (markup #:upright #:concat (prefix fret-nbr
>>>
>>
>> You've defined Prefix with a capital "P" above.
>>
>>
>>> (let* ((mrkp (markup #:upright #:concat (#:lower 0.08 prefix #:lower
>>> 0.05 fret-nbr #:hspace 0.3
>>>
>>
>> Same problem here.
>>
>
> Actually no, 'prefix' here should be the markup-command not a variable.
> How can I fix that ?
>
>

Ah, I see.  I just got the errors to go away, and figured I had fixed it!

I believe that you want this line:

(let* ((mrkp (markup #:upright #:concat (#:lower 0.08 #:prefix string-qty
#:lower 0.05 fret-nbr #:hspace 0.3

%%
I added in the string-qty because \prefix expects an integer,

Does this give you what you want?

--David
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Re: Merging a markup-command with an event-function

[Pierre Perol-Schneider]

Absolutely!
A big thanks David !!!

2015-03-14 20:01 GMT+01:00 David Nalesnik :

> Hi Pierre,
>
> On Sat, Mar 14, 2015 at 1:49 PM, Pierre Perol-Schneider <
> pierre.schneider.pa...@gmail.com> wrote:
>
>> Hi David,
>>
>> 2015-03-14 19:03 GMT+01:00 David Nalesnik :
>>
>>
>>> However, why don't you subsume this in the let-block?
>>>
>>
>> I've tried to - in fact I've tried a lot of things... without succes.
>>
>>
>>>
>>>
   (define string-qty arg-string-qty)
   ;; hereunder should be fine:
   (let* ((mrkp (markup #:upright #:concat (prefix fret-nbr

>>>
>>> You've defined Prefix with a capital "P" above.
>>>
>>>
 (let* ((mrkp (markup #:upright #:concat (#:lower 0.08 prefix
 #:lower 0.05 fret-nbr #:hspace 0.3

>>>
>>> Same problem here.
>>>
>>
>> Actually no, 'prefix' here should be the markup-command not a variable.
>> How can I fix that ?
>>
>>
>
> Ah, I see.  I just got the errors to go away, and figured I had fixed it!
>
> I believe that you want this line:
>
> (let* ((mrkp (markup #:upright #:concat (#:lower 0.08 #:prefix string-qty
> #:lower 0.05 fret-nbr #:hspace 0.3
>
> %%
> I added in the string-qty because \prefix expects an integer,
>
> Does this give you what you want?
>
> --David
>
>
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Re: Merging a markup-command with an event-function

[David Nalesnik]

On Sat, Mar 14, 2015 at 2:01 PM, David Nalesnik 
wrote:

> Hi Pierre,
>
> On Sat, Mar 14, 2015 at 1:49 PM, Pierre Perol-Schneider <
> pierre.schneider.pa...@gmail.com> wrote:
>
>> Hi David,
>>
>> 2015-03-14 19:03 GMT+01:00 David Nalesnik :
>>
>>
>>> However, why don't you subsume this in the let-block?
>>>
>>
>> I've tried to - in fact I've tried a lot of things... without succes.
>>
>
With the changed mrkp above, I'm able to write this (removing extra
parenthesis later on):


startBarre =
#(define-event-function (parser location arg-string-qty fret-nbr) (integer?
markup?)
 (let* ((string-qty arg-string-qty)
(mrkp (markup #:upright #:concat (#:lower 0.08 #:prefix
string-qty
   #:lower 0.05 fret-nbr
#:hspace 0.3
   (define (width grob text-string)

[...]
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Re: Merging a markup-command with an event-function

[Pierre Perol-Schneider]

Very well, thanks again David.
I've just completed this snippet :  http://lsr.di.unimi.it/LSR/Item?id=952

Cheers,
Pierre
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draw-line

[Stephen MacNeil]

can I curve a line?


\draw-line #'(1 . 1)


Thanks

Stephen
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Re: opera written with lily performance/demo

[flup2]

Congratulations :-)

Philippe


Jay Hamilton-3 wrote
> After trials and tribulations and a great deal of help from many of you 
> I finished the score to my opera The Map in 2012.
> 
> www.themaptheopera.com
> 
> On the 21st of March a performance (to garner more support for a full 
> production) of 5 scenes is Happening.
> 
> Thanks for the aid- truly
> Jay
> 
> -- 
> Thanks for reading
> blogs at
> https://learnivore.com/users/music#
> www.soundand.com
> www.themaptheopera.com
> Jay
> 
> ___
> lilypond-user mailing list

> lilypond-user@

> https://lists.gnu.org/mailman/listinfo/lilypond-user





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Starting music at an arbitrary bar

[J Martin Rushton]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

GNU LilyPond 2.18.2
TiMidity++ version 2.14.0

When working on a piece it I tend to generate a MIDI file and play it
back to assure myself that what I'm writing corresponds to what I'm
thinking.  Not, I suspect, that unusual.  However, as a piece
lengthens more time is spent listening to music already accepted
before getting to the latest part.  Is there any way to start from an
arbitrary bar?

I realise that I can break the lines up:

Old-descant = { ... }
New-descant = { ... }

Descant = \new Voice {
  ...
  \relative c'' {
%\Old-descant
\New-descant
  }

And move the notes from new to old as I progress.  It's very prone to
misaligning the parts though.

Any advice gratefully received.
Martin
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Version: GnuPG v2.0.22 (GNU/Linux)

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Re: Starting music at an arbitrary bar

[Simon Albrecht]

Hi Martin,

see 
. 
showFirstLength and showLastLength should do what you want.


Yours, Simon

Am 14.03.2015 um 22:02 schrieb J Martin Rushton:

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

GNU LilyPond 2.18.2
TiMidity++ version 2.14.0

When working on a piece it I tend to generate a MIDI file and play it
back to assure myself that what I'm writing corresponds to what I'm
thinking.  Not, I suspect, that unusual.  However, as a piece
lengthens more time is spent listening to music already accepted
before getting to the latest part.  Is there any way to start from an
arbitrary bar?

I realise that I can break the lines up:

Old-descant = { ... }
New-descant = { ... }

Descant = \new Voice {
   ...
   \relative c'' {
%\Old-descant
 \New-descant
   }

And move the notes from new to old as I progress.  It's very prone to
misaligning the parts though.

Any advice gratefully received.
Martin
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Re: Starting music at an arbitrary bar

[J Martin Rushton]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hi Simon,

Thankyou very much, that's exactly what I wanted.  What's _really_
annoying is that I had the following page (which has MIDI output on
it) open.

Regards,
Martin

On 14/03/15 22:16, Simon Albrecht wrote:
> Hi Martin,
> 
> see 
> .
>
> 
showFirstLength and showLastLength should do what you want.
> 
> Yours, Simon
> 
> Am 14.03.2015 um 22:02 schrieb J Martin Rushton: GNU LilyPond
> 2.18.2 TiMidity++ version 2.14.0
> 
> When working on a piece it I tend to generate a MIDI file and play
> it back to assure myself that what I'm writing corresponds to what
> I'm thinking.  Not, I suspect, that unusual.  However, as a piece 
> lengthens more time is spent listening to music already accepted 
> before getting to the latest part.  Is there any way to start from
> an arbitrary bar?
> 
> I realise that I can break the lines up:
> 
> Old-descant = { ... } New-descant = { ... }
> 
> Descant = \new Voice { ... \relative c'' { %\Old-descant 
> \New-descant }
> 
> And move the notes from new to old as I progress.  It's very prone
> to misaligning the parts though.
> 
> Any advice gratefully received. Martin
>> 
>> ___ lilypond-user
>> mailing list lilypond-user@gnu.org 
>> https://lists.gnu.org/mailman/listinfo/lilypond-user
> 
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Re: Starting music at an arbitrary bar

[Colin Campbell]

On 2015-03-14 04:26 PM, J Martin Rushton wrote:

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Hi Simon,

Thankyou very much, that's exactly what I wanted.  What's _really_
annoying is that I had the following page (which has MIDI output on
it) open.

Regards,
Martin



Also, if you are using Frescobaldi, you can use the MIDI player tool. 
The slider allows you to move to a specific bar/beat and play from there.


Cheers,
Colin


--
I've learned that you shouldn't go through life with a catcher's mitt on both 
hands.
You need to be able to throw something back.
-Maya Angelou, poet (1928- )


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Re: building pairs in music functions

[Kevin Barry]

On Fri, Mar 13, 2015 at 3:34 PM, Stephen MacNeil 
wrote:

> \version "2.18.2"
>
>
> rotateBracket =
>
> #(define-music-function (parser location input) (pair?)
>
> #{
>
> \once \override HorizontalBracket.bracket-flare = $input
>
> #})
>

Actually I wanted to build the bracket flare from a single value, but I had
stripped away most of the code for the purposes of the question. I do a lot
of analytic music examples and for that I often angle the
HorizontalBrackets, but each time I rotate one it requires using
trigonometry (seriously) to calculate the right bracket-flare values, so I
just wanted to do that automatically. I eventually got something that
works. Here it is in case anyone is interested:

\version "2.18.2"

startAngledGroup =
#(define-event-function (parser location num)
   (integer?)
   (let* ((rot-angle (degrees->radians num))
  (left-flare (- (tan rot-angle)))
  (right-flare (tan rot-angle))
  (y-offset (- (/ num 10
 (define flare-callback
   (lambda (grob)
 (ly:grob-set-property! grob 'rotation (list num 0 0))
 (if (= UP (ly:grob-property grob 'direction))
  (ly:grob-set-property! grob 'bracket-flare (cons right-flare
left-flare))
  (ly:grob-set-property! grob 'bracket-flare (cons left-flare
right-flare)
 #{
   \single \override HorizontalBracket.before-line-breaking =
#flare-callback
   \startGroup
 #}))

\relative {
  b\startAngledGroup #10 e\stopGroup
}

\layout {
  \context {
\Voice
\consists "Horizontal_bracket_engraver"
  }
}
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Re: draw-line

[Kevin Barry]

On Sat, Mar 14, 2015 at 8:46 PM, Stephen MacNeil 
wrote:

> can I curve a line?


You probably want the \path command which is documented here:
http://lilypond.org/doc/v2.18/Documentation/notation/graphic
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Re: Merging a markup-command with an event-function

[Nick Payne]

On 15/03/2015 04:42, Pierre Perol-Schneider wrote:

Hi,

In order to make a new guitar barré function, I'm trying to merge the 
attached markup-command with an event-function (without success - 
problem is on line #90)


Not to answer your question, but why not do it like this, which seems a 
lot simpler. If you want to preface the Roman numeral fret number with 
"C", just add "C" as the first thing after the opening brace for the markup.


\version "2.18.2"

beginBarre = #(define-event-function (parser location fretnum partial)
(number? number?)
#{
  \tweak bound-details.left.text
  \markup\small\bold\concat { #(format #f "~@r" fretnum)
  \sub #(number->string 
partial) }

  \tweak style #'line
  \tweak font-shape #'upright
  \tweak bound-details.right.text \markup { \draw-line 
#'(0 . -1) }

  \tweak bound-details.left.stencil-align-dir-y #0.35
  \tweak bound-details.left.padding #-0.25
  \tweak bound-details.right.padding #-1
  \tweak bound-details.right-broken.padding #0.5
  \tweak bound-details.left-broken.padding #2
  \tweak bound-details.left-broken.text ##f
  \tweak bound-details.right-broken.text ##f
  \startTextSpan
#})
endBarre = \stopTextSpan

{
  \clef "G_8"
  \key d\minor
  <<
{ \voiceOne a'16[ \beginBarre 3 4 bes d' bes f'8] \endBarre }
\\
{ \voiceTwo d2 }
  >>
}

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