Re: Beginning contributor needs mentor

[Urs Liska]

Welcome to LilyPond and this list, John,

Am 10.11.2015 um 16:36 schrieb John Gourlay:
> I’m an aspiring LilyPond contributor who needs a mentor. How can I get one?

I'm not sure you can "get one" here because there are simply too few
developers around.
But if you continue asking questions on this list you will probably get
more concrete information about the processes and you'll probably find
the niche(s) where your skills can be most usefully be applied.

>
> So far I can compile LilyDev itself and the documentation, and I’m becoming 
> familiar with git. I’m looking at the LilyPond Contributor’s Guide, but I 
> have to admit that it’s a bit overwhelming. 

This is surely true.
Don't hesitate to ask if you have problems understanding something. And
also tell us if you find anything misleading, overly complicated or in
any other way improveable.

> I’m a recently retired software engineer highly experienced with C++, less 
> with Unix and open-source development, and not at all with Scheme. 

If I'm not mistaken there are fewer C++ developers around than Schemers,
so that seems like a good addition. Although learning some Scheme might
as well be useful ...

> I’m not a musician, and I’ve used LilyPond only for toy examples so far. 
> However, I once knew a lot about using computers to engrave music, as I was 
> the principal investigator for the MusiCopy Project at Ohio State University 
> in the 1980s. I’m sure that much has changed since then, but I’m pleased to 
> say that LilyDev looks to be very much like what MusiCopy might have been if 
> we’d had an opportunity to complete it. I’d like to help further the LilyPond 
> project in some way.

Sounds very nice. I hope you'll find your way through LilyPond and the
developer circle.

Best
Urs

>
> John Gourlay
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Re: Beginning contributor needs mentor

[Werner LEMBERG]

Hello John!


> I’m a recently retired software engineer highly experienced with
> C++, less with Unix and open-source development, and not at all with
> Scheme.

Assuming that you are a Windows guy: It would be great if you could
make lilypond compile on that platform!  There are also some rough
edges here and there that would need a helping hand from someone who
is an experienced programmer.


Werner
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Re: Beginning contributor needs mentor

[James]

Hello Werner,

On 10/11/15 16:10, Werner LEMBERG wrote:
> Hello John!
>
>
>> I’m a recently retired software engineer highly experienced with
>> C++, less with Unix and open-source development, and not at all with
>> Scheme.
> Assuming that you are a Windows guy: It would be great if you could
> make lilypond compile on that platform!  

I believe that Masamichi Hosada  compiles on Windows. I have some
instructions from him in a private email that I was going to try out
myself and then document for our CG.

I am ccing him in case I am mis-representing him.

James


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RE: Beginning contributor needs mentor

[Mike Solomon]

Wait wait wait, are you THE John Gourlay?As in "Spacing a Line of Music" 1987 
John Gourlay? If so, you should be mentoring us, not the other way around! I 
think I've cited you in every paper I've ever written about notation.
I'd love to help you get started. It is your algorithm at the heart of 
LilyPond's horizontal spacing engine, so that can be a place to start if you're 
up for it!
Cheers,~Mike
PS If you're not the John Gourlay of which I speak, my offer for help still 
stands!


Sent from my Samsung device

 Original message 
From: John Gourlay  
Date: 10/11/2015  5:36 PM  (GMT+02:00) 
To: lilypond-devel@gnu.org 
Subject: Beginning contributor needs mentor 

I’m an aspiring LilyPond contributor who needs a mentor. How can I get one?

So far I can compile LilyDev itself and the documentation, and I’m becoming 
familiar with git. I’m looking at the LilyPond Contributor’s Guide, but I have 
to admit that it’s a bit overwhelming. I’m a recently retired software engineer 
highly experienced with C++, less with Unix and open-source development, and 
not at all with Scheme. I’m not a musician, and I’ve used LilyPond only for toy 
examples so far. However, I once knew a lot about using computers to engrave 
music, as I was the principal investigator for the MusiCopy Project at Ohio 
State University in the 1980s. I’m sure that much has changed since then, but 
I’m pleased to say that LilyDev looks to be very much like what MusiCopy might 
have been if we’d had an opportunity to complete it. I’d like to help further 
the LilyPond project in some way.

John Gourlay
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Re: Beginning contributor needs mentor

[James]

:)

On 10/11/15 15:53, Mike Solomon wrote:
> 
> Wait wait wait, are you THE John Gourlay?As in "Spacing a Line of Music" 1987 
> John Gourlay? If so, you should be mentoring us, not the other way around! I 
> think I've cited you in every paper I've ever written about notation.

We also cite Mr Gourlay a number of times in our own Essay

http://lilypond.org/essay.html

James

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Beginning contributor needs mentor

[John Gourlay]

I’m an aspiring LilyPond contributor who needs a mentor. How can I get one?

So far I can compile LilyDev itself and the documentation, and I’m becoming 
familiar with git. I’m looking at the LilyPond Contributor’s Guide, but I have 
to admit that it’s a bit overwhelming. I’m a recently retired software engineer 
highly experienced with C++, less with Unix and open-source development, and 
not at all with Scheme. I’m not a musician, and I’ve used LilyPond only for toy 
examples so far. However, I once knew a lot about using computers to engrave 
music, as I was the principal investigator for the MusiCopy Project at Ohio 
State University in the 1980s. I’m sure that much has changed since then, but 
I’m pleased to say that LilyDev looks to be very much like what MusiCopy might 
have been if we’d had an opportunity to complete it. I’d like to help further 
the LilyPond project in some way.

John Gourlay
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PATCHES: Countdown for November 13th 2015

[James]

Hello,
Here is the current patch countdown list. The next countdown will be on
November 13th



PUSH:

4653 French beam ending on rest causes segfault - David Kastrup
https://sourceforge.net/p/testlilyissues/issues/4653/
http://codereview.appspot.com/274280043


4504 Revert interface changes for whiteout (issue 4418) - Paul Morris
https://sourceforge.net/p/testlilyissues/issues/4504/
http://codereview.appspot.com/275770043




COUNTDOWN:


4650 Usage 1.2: svg-woff option badly described  - James Lowe
https://sourceforge.net/p/testlilyissues/issues/4650/
http://codereview.appspot.com/274260043


4656 Let concat-markup fold \char calls into surrounding strings - David
Kastrup
https://sourceforge.net/p/testlilyissues/issues/4656/
http://codereview.appspot.com/272420043


4654 Wrong fret label values in predefined custom fretboards containing
text strings - David Kastrup
https://sourceforge.net/p/testlilyissues/issues/4654/
http://codereview.appspot.com/276810043





REVIEW:


3088 Implement \undertie markup - Thomas Morley
https://sourceforge.net/p/testlilyissues/issues/3088/
http://codereview.appspot.com/270640043

___


NEW:

No New patches at this time.





WAITING:


4600 Let notes/rests suppress multi-measure rest grobs - Dan Eble
https://sourceforge.net/p/testlilyissues/issues/4600/
https://codereview.appspot.com/265160043/


3918 Add \alternatingTimeSignatures - Urs Liska
https://sourceforge.net/p/testlilyissues/issues/3918/
http://codereview.appspot.com/97110045


3156 Prevents vertical axis groups with empty skylines - Mike Solomon
https://sourceforge.net/p/testlilyissues/issues/3156/
http://codereview.appspot.com/7311048


3134 Removes the translate_axis call from axis-group-interface
outside-staff positioning.  - Mike Solomon
https://sourceforge.net/p/testlilyissues/issues/3134/
http://codereview.appspot.com/7185044


2643 Attach lilypond source in pdf - Valentin Villenave
https://sourceforge.net/p/testlilyissues/issues/2643/
http://codereview.appspot.com/225040043






James

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Re: Beginning contributor needs mentor

[Simon Albrecht]

On 10.11.2015 16:36, John Gourlay wrote:

I’m a recently retired software engineer highly experienced with C++, less with 
Unix and open-source development, and not at all with Scheme.


I fear that you may not get around learning some scheme, since our C++ 
source is quite interlinked with scheme parts, but I may be mistaken. 
The Guile Reference Manual 
 may help.


Yours, Simon

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Re: Beginning contributor needs mentor

[Urs Liska]

Am 10.11.2015 um 21:47 schrieb John Gourlay:
> Mike,
>
> Yes, I am the spacing-a-line-of-music John Gourlay, pleased that my early 
> contributions have turned out to be useful. I’ve been out of the loop for 
> about 30 years, however, so it won’t happen that I’ll be doing any mentoring 
> myself for some time. Indeed I’ve been working in Windows for the past 20 
> years or so, usually very close to the machine, helping in the development of 
> real-time software for testing engines and transmissions used by the big auto 
> manufacturers at the ends of their assembly lines. Only now that I’ve retired 
> from that job do I feel like I have time to give back to the open-source 
> community. I only learned about LilyPond about two years ago from Daniel 
> Spreadbury who tracked me down hoping to get some of the unpublished MusiCopy 
> reports. (Of course I can make them available to you, too, if you like.) He 
> was working for Steinberg in England on a new music scoring application and 
> wanted to use some of the ideas from the MusiCopy project. As we conversed he 
> pointed out that the ideas are already in use in a number of music formatting 
> systems including LilyPond. Unfortunately I’ve never heard that the Steinberg 
> product was released. 

Well, they are still on their way towards an initial release, see
http://blog.steinberg.net/ for Daniel's very informative development
reports.

> So, where do I go from here? If you have a narrow, low-priority bug or new 
> feature for me to work on it could help me focus my attention. 

My perspective may not be representative but two different topics spring
to my mind (just rushing forward to get some attention before others
with more important issues step out ;-)

There is one topic that might be interesting, although it's not
necessarily narrow - but with prepared ground. One part where LilyPond
would deserve some care is its tie formatting. Janek Warchoł who has
unfortunately more or less dropped out of work (due to a "real life"
job) has invested quite some work in the research and preparation of a
"tie crusade" (see http://lilypondblog.org/2013/07/lilypond-tie-crusade/
and http://lilypondblog.org/2013/08/tie-crusade-round-2/). This may be
interesting as it is a challenging task but very rewarding and
(hopefully well) prepared.

Another issue is maybe a really tiny but also rewarding issue.
I got stuck in my first attempt at a patch in the C++ domain when I
tried to make the selection of alternative notation fonts significantly
simpler. The road block was in an external dependency (fontconfig) but
nevertheless it might be something small enough to get "into it".

But of course it might be more promising if some of those people step
out who are active (and knowledgeable) in the C++ domain.

Urs

> I certainly need to spend more time with the Contributor’s Guide; the 
> messages on lilypond-devel are mostly inscrutable to me, and I don’t know 
> anything yet about the tools used to track bugs, fixes, reviews, and 
> releases. Separately, I feel like I ought to learn more about using LilyPond 
> so that I can better understand new feature requests and judge whether or not 
> a fix is appropriate. Regardless, I’ll take whatever suggestions you’d like 
> to make to help me get started.
>
> John
>
>> On Nov 10, 2015, at 10:53 AM, Mike Solomon  wrote:
>>
>> Wait wait wait, are you THE John Gourlay?
>> As in "Spacing a Line of Music" 1987 John Gourlay? If so, you should be 
>> mentoring us, not the other way around! I think I've cited you in every 
>> paper I've ever written about notation.
>>
>> I'd love to help you get started. It is your algorithm at the heart of 
>> LilyPond's horizontal spacing engine, so that can be a place to start if 
>> you're up for it!
>>
>> Cheers,
>> ~Mike
>>
>> PS If you're not the John Gourlay of which I speak, my offer for help still 
>> stands!
>>
>>
>>
>> Sent from my Samsung device
>>
>>
>>  Original message 
>> From: John Gourlay  
>> Date: 10/11/2015 5:36 PM (GMT+02:00) 
>> To: lilypond-devel@gnu.org 
>> Subject: Beginning contributor needs mentor 
>>
>> I’m an aspiring LilyPond contributor who needs a mentor. How can I get one?
>>
>> So far I can compile LilyDev itself and the documentation, and I’m becoming 
>> familiar with git. I’m looking at the LilyPond Contributor’s Guide, but I 
>> have to admit that it’s a bit overwhelming. I’m a recently retired software 
>> engineer highly experienced with C++, less with Unix and open-source 
>> development, and not at all with Scheme. I’m not a musician, and I’ve used 
>> LilyPond only for toy examples so far. However, I once knew a lot about 
>> using computers to engrave music, as I was the principal investigator for 
>> the MusiCopy Project at Ohio State University in the 1980s. I’m sure that 
>> much has changed since then, but I’m pleased to say that LilyDev looks to be 
>> very much like what MusiCopy might 

Re: Implement make-bow-stencil, make-tie-stencil for use in markup-commands undertie and overtie (issue 270640043 by thomasmorle...@gmail.com)

[thomasmorley65]

On 2015/11/08 23:54:37, dak wrote:

On 2015/11/08 23:22:51, thomasmorley651 wrote:
> https://codereview.appspot.com/270640043/diff/20001/scm/stencil.scm
> File scm/stencil.scm (right):
>
>

https://codereview.appspot.com/270640043/diff/20001/scm/stencil.scm#newcode88

> scm/stencil.scm:88: (sqrt (+ (* width width) (* height height
> On 2015/11/08 21:22:04, dak wrote:
> > Is there a reason you are actually taking the absolute values of

width and

> > height?  You don't need them for calculating the length here.
>
> Not sure what you mean.
> Isn't it simple Pythagoras?


See bottom.


>
>

https://codereview.appspot.com/270640043/diff/20001/scm/stencil.scm#newcode100

> scm/stencil.scm:100: (/ height length-to-print
> On 2015/11/08 21:22:04, dak wrote:
> > This looks like a total mess.  Do you even need all this for

something?

What
> > are you trying to do?
> >
> > Perhaps express it in words and we'll try finding a direct

representation

that
> > does not need all this juggling with angles and stuff.
>
> You ask for quadrant and angle-start/stop-X-axis, right?
>
> I hoped I had put in enough comments to explain what's done and why,

obviously

> not sufficient.
>
> In general I have to points P(x1 y1) and Q(x2 y2) and want to create

a bow

> connecting them.
> Therefore I first boil down it, to create a bow from Zero(0 0) to a

point on

the
> (positive-part) of X-axis with with the coordinates

(direct-distance-P-Q 0),

> because it's far easier to calculate.
> After this is done the bow is rotated around Zero to have it the

same

> orientation like the direct connection of P and Q.
> Last step is to move the bow from Zero to P.
>
> For the rotating part I need the value of the angle which depends on

the

> quadrants of Q relative to P. Calculated using Zero and P moved to

'new-stop'

>
> Hope this is clearer now.
>
> In general I regard the section containing quadrant and
angle-start/stop-X-axis
> the weakest part of the code.
> Any suggestion is highly welcome.



What do you need angles and quadrants for?



Assuming that you create your bow as a bow from (0,0) to (1,0),
you can then transform a point (x0,y0) on this bow to one from P(x1

y1) to Q(x2

y2)
by using (x0*(x2-x1)-y0*(y2-y1)+x1, x0*(y2-y1)+y0*(x2-x1)+y1)
assuming that I did not make a mistake here.  No quadrants, no angles,

no

trigonometry,
no square roots.


New patch follows your suggestions, thanks a lot for it.
One problem remaining, for the length I still use square roots - don't
know how to do it different.

https://codereview.appspot.com/270640043/

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Re: Beginning contributor needs mentor

[John Gourlay]

Mike,

Yes, I am the spacing-a-line-of-music John Gourlay, pleased that my early 
contributions have turned out to be useful. I’ve been out of the loop for about 
30 years, however, so it won’t happen that I’ll be doing any mentoring myself 
for some time. Indeed I’ve been working in Windows for the past 20 years or so, 
usually very close to the machine, helping in the development of real-time 
software for testing engines and transmissions used by the big auto 
manufacturers at the ends of their assembly lines. Only now that I’ve retired 
from that job do I feel like I have time to give back to the open-source 
community. I only learned about LilyPond about two years ago from Daniel 
Spreadbury who tracked me down hoping to get some of the unpublished MusiCopy 
reports. (Of course I can make them available to you, too, if you like.) He was 
working for Steinberg in England on a new music scoring application and wanted 
to use some of the ideas from the MusiCopy project. As we conversed he pointed 
out that the ideas are already in use in a number of music formatting systems 
including LilyPond. Unfortunately I’ve never heard that the Steinberg product 
was released. 

So, where do I go from here? If you have a narrow, low-priority bug or new 
feature for me to work on it could help me focus my attention. I certainly need 
to spend more time with the Contributor’s Guide; the messages on lilypond-devel 
are mostly inscrutable to me, and I don’t know anything yet about the tools 
used to track bugs, fixes, reviews, and releases. Separately, I feel like I 
ought to learn more about using LilyPond so that I can better understand new 
feature requests and judge whether or not a fix is appropriate. Regardless, 
I’ll take whatever suggestions you’d like to make to help me get started.

John

> On Nov 10, 2015, at 10:53 AM, Mike Solomon  wrote:
> 
> Wait wait wait, are you THE John Gourlay?
> As in "Spacing a Line of Music" 1987 John Gourlay? If so, you should be 
> mentoring us, not the other way around! I think I've cited you in every paper 
> I've ever written about notation.
> 
> I'd love to help you get started. It is your algorithm at the heart of 
> LilyPond's horizontal spacing engine, so that can be a place to start if 
> you're up for it!
> 
> Cheers,
> ~Mike
> 
> PS If you're not the John Gourlay of which I speak, my offer for help still 
> stands!
> 
> 
> 
> Sent from my Samsung device
> 
> 
>  Original message 
> From: John Gourlay  
> Date: 10/11/2015 5:36 PM (GMT+02:00) 
> To: lilypond-devel@gnu.org 
> Subject: Beginning contributor needs mentor 
> 
> I’m an aspiring LilyPond contributor who needs a mentor. How can I get one?
> 
> So far I can compile LilyDev itself and the documentation, and I’m becoming 
> familiar with git. I’m looking at the LilyPond Contributor’s Guide, but I 
> have to admit that it’s a bit overwhelming. I’m a recently retired software 
> engineer highly experienced with C++, less with Unix and open-source 
> development, and not at all with Scheme. I’m not a musician, and I’ve used 
> LilyPond only for toy examples so far. However, I once knew a lot about using 
> computers to engrave music, as I was the principal investigator for the 
> MusiCopy Project at Ohio State University in the 1980s. I’m sure that much 
> has changed since then, but I’m pleased to say that LilyDev looks to be very 
> much like what MusiCopy might have been if we’d had an opportunity to 
> complete it. I’d like to help further the LilyPond project in some way.
> 
> John Gourlay
> ___
> lilypond-devel mailing list
> lilypond-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/lilypond-devel


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Re: Implement make-bow-stencil, make-tie-stencil for use in markup-commands undertie and overtie (issue 270640043 by thomasmorle...@gmail.com)

[dak]

https://codereview.appspot.com/270640043/diff/40001/scm/stencil.scm
File scm/stencil.scm (right):

https://codereview.appspot.com/270640043/diff/40001/scm/stencil.scm#newcode73
scm/stencil.scm:73: (width (- (car stop) (car start)))
I'd not use `width' (and `height') here but `dx' and `dy': the
expectation for variable names `width' and `height' is that they will
generally be non-negative.

https://codereview.appspot.com/270640043/diff/40001/scm/stencil.scm#newcode81
scm/stencil.scm:81:  beginning '(0 . 0), ending at (cons
length-to-print 0)
Ah, here's the rub.  Why end at (length-to-print . 0) instead of (1 .
0)?  Scaling by length at the start instead of after you are done makes
things unnecessarily complex and indeed requires Pythagoras.  If you
instead work with a "unit" bow, scaling and rotating the resulting
points to match some actual line does not require calculating the line
length but just the equivalent of a complex multiplication in cartesian
coordinates.

https://codereview.appspot.com/270640043/diff/40001/scm/stencil.scm#newcode123
scm/stencil.scm:123: length-to-print)
See?  You've effectively multiplied everything with length-to-print at
the start, just to divide by it again here.

Total waste of effort.

https://codereview.appspot.com/270640043/

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Re: Beginning contributor needs mentor

[Mike Solomon]

I'll scour the tracker - there is a bit of low hanging fruit in the beautifying 
department that is nice because it will not be too sprawling and will result in 
immediately perceptible visual improvements.
~Mike

Sent from my Samsung device

 Original message 
From: John Gourlay  
Date: 10/11/2015  10:47 PM  (GMT+02:00) 
To: Mike Solomon  
Cc: lilypond-devel@gnu.org 
Subject: Re: Beginning contributor needs mentor 

Mike,

Yes, I am the spacing-a-line-of-music John Gourlay, pleased that my early 
contributions have turned out to be useful. I’ve been out of the loop for about 
30 years, however, so it won’t happen that I’ll be doing any mentoring myself 
for some time. Indeed I’ve been working in Windows for the past 20 years or so, 
usually very close to the machine, helping in the development of real-time 
software for testing engines and transmissions used by the big auto 
manufacturers at the ends of their assembly lines. Only now that I’ve retired 
from that job do I feel like I have time to give back to the open-source 
community. I only learned about LilyPond about two years ago from Daniel 
Spreadbury who tracked me down hoping to get some of the unpublished MusiCopy 
reports. (Of course I can make them available to you, too, if you like.) He was 
working for Steinberg in England on a new music scoring application and wanted 
to use some of the ideas from the MusiCopy project. As we conversed he pointed 
out that the ideas are already in use in a number of music formatting systems 
including LilyPond. Unfortunately I’ve never heard that the Steinberg product 
was released. 

So, where do I go from here? If you have a narrow, low-priority bug or new 
feature for me to work on it could help me focus my attention. I certainly need 
to spend more time with the Contributor’s Guide; the messages on lilypond-devel 
are mostly inscrutable to me, and I don’t know anything yet about the tools 
used to track bugs, fixes, reviews, and releases. Separately, I feel like I 
ought to learn more about using LilyPond so that I can better understand new 
feature requests and judge whether or not a fix is appropriate. Regardless, 
I’ll take whatever suggestions you’d like to make to help me get started.

John

> On Nov 10, 2015, at 10:53 AM, Mike Solomon  wrote:
> 
> Wait wait wait, are you THE John Gourlay?
> As in "Spacing a Line of Music" 1987 John Gourlay? If so, you should be 
> mentoring us, not the other way around! I think I've cited you in every paper 
> I've ever written about notation.
> 
> I'd love to help you get started. It is your algorithm at the heart of 
> LilyPond's horizontal spacing engine, so that can be a place to start if 
> you're up for it!
> 
> Cheers,
> ~Mike
> 
> PS If you're not the John Gourlay of which I speak, my offer for help still 
> stands!
> 
> 
> 
> Sent from my Samsung device
> 
> 
>  Original message 
> From: John Gourlay  
> Date: 10/11/2015 5:36 PM (GMT+02:00) 
> To: lilypond-devel@gnu.org 
> Subject: Beginning contributor needs mentor 
> 
> I’m an aspiring LilyPond contributor who needs a mentor. How can I get one?
> 
> So far I can compile LilyDev itself and the documentation, and I’m becoming 
> familiar with git. I’m looking at the LilyPond Contributor’s Guide, but I 
> have to admit that it’s a bit overwhelming. I’m a recently retired software 
> engineer highly experienced with C++, less with Unix and open-source 
> development, and not at all with Scheme. I’m not a musician, and I’ve used 
> LilyPond only for toy examples so far. However, I once knew a lot about using 
> computers to engrave music, as I was the principal investigator for the 
> MusiCopy Project at Ohio State University in the 1980s. I’m sure that much 
> has changed since then, but I’m pleased to say that LilyDev looks to be very 
> much like what MusiCopy might have been if we’d had an opportunity to 
> complete it. I’d like to help further the LilyPond project in some way.
> 
> John Gourlay
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> lilypond-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/lilypond-devel

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[feature-request] optional duration for temporary

[Kieren MacMillan]

Hello all,

Rather than having to \revert an \override (or set of \override-s), might it be 
possible to set an optional duration for which the override would be in effect? 
e.g.

  \temporary #’(10 1/8) \override LyricText.extra-offset = #’(0 . -1)

would lower the LyricText(s) for exactly 10 measures and 1 eighth note after 
the command was issued.

Just a “would be nice”.

Thanks!
Kieren.


Kieren MacMillan, composer
‣ website: www.kierenmacmillan.info
‣ email: i...@kierenmacmillan.info


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