Re: Extended bar checking?

[Kenneth Wolcott]

Thanks for mentioning this.  I too have encountered this problem.

Ken Wolcott

On Sun, Sep 18, 2022 at 11:33 AM Mats Bengtsson
<matsboxergrand@gmail.com> wrote:
>
> Hi,
>
> I've been pondering about a missing feature in LilyPond, namely the 
> possibility to get a warning printout if there isn't an explicit bar check 
> ("|") in the input file at the end of each measure. This would catch many of 
> the typos I personally do when entering music, where I happen to forget to 
> change a duration, or enter the wrong duration, so that the current default 
> duration happens to be, say, double the correct duration.
>
> Example: Let's say I want to type
>
> \relative c' {
> c4 d e2 |
> g1 |
> g4 f e d |
> c1
> }
> but forget to add the duration "4" in the third measure:\relative c' {
> c4 d e2 |
> g1 |
> g f e d |
> c1
> }
> Obviously, this will not give any bar check warning, but if there was a 
> possibility to get a warning also for missing bar checks, I would immediately 
> catch those mistakes. This feature should not be on by default, but for those 
> of us who consequently add bar checks in the input files, it would be 
> extremely helpful.
>
> In another email thread today, Valentine provided an implementation of a 
> Bar_check_warning_egraver is somewhat along the same lines, but that 
> unfortunatly fails to catch the typo in the above example since it only 
> detects notes  where the duration crosses a bar line. As far as I can see, 
> the idea of Valentine's implementation cannot easily be extended to do what 
> I'm after and it's not immediately obvious to me how hard it would be to 
> implement it. Perhaps some of you clever LilyPond hackers on the list have an 
> idea, otherwise I will send it as a feature request to the bug list.
>
>    /Mats