Re: SyncTeX does not work with Zathura

["Cezary Drożak via ntg-context" <ntg-context@ntg.nl>]

 > I can't say ... what is missing? Can you figure out what makes Zathura 
unhappy?

I run gdb with breakpoint set on zathura/synctex.c:86 and while
`synctex_get_input_line_column` returns true, `input_file` is `NULL` so the
"else" branch is executed. That is all I managed to debug, I don't know how 
I
could step into the SyncTeX function.

 > here with
 >
 > \starttext
 > Hello, world!
 > \stoptext
 >
 > i get
 >
 > SyncTeX Version:1
 > Input:1:oeps.tex
 > Output:pdf
 > Magnification:1000
 > Unit:1
 > X Offset:0
 > Y Offset:0
 > Content:
 > !103
 > {1
 > [0,0:0,0:0,0,0
 > v0,0:0,55380990:39158276,55380990,0
 > h1,6:4661756,9176901:4275840,655360,327680
 > ]
 > !104
 > }1
 > !8
 > Postamble:
 > Count:3
 > !22
 > Post scriptum:
 >
 > (also with context --synctex oeps)

For me it generated a slightly smaller file:

 > SyncTeX Version:1
 > Input:1:/home/nawordar/projects/zathura/build/oeps.tex
 > Output:pdf
 > Magnification:1000
 > Unit:1
 > X Offset:0
 > Y Offset:0
 > Content:
 > !141
 > {1
 > [0,0:0,0:0,0,0
 > v0,0:0,55380990:39158276,55380990,0
 > ]
 > !61
 > }1
 > !7
 > Postamble:
 > Count:2
 > !22
 > Post scriptum:

Similarly to previous examples, `mtxrun --script synctex --list 
oeps.synctex`
only showed me that much:

```
mtx-synctex     | begin page: 1
mtx-synctex     | end page: 1
```

When I executed it on your SyncTeX file, it showed one line more:

```
mtx-synctex     | begin page: 1
mtx-synctex     |   [  71  135  136  149] :     6 : oeps.tex
mtx-synctex     | end page: 1
```

Still, with both files Zathura gave me the same error :/. It is really 
weird
though, that ConTeXt generated a different SyncTeX file for me for the same
exact file and command.

The versions of ConTeXt and SyncTeX:

```
$ synctex help
This is SyncTeX command line utility, version 1.5
usage: synctex <subcommand> [options] [args]
Synchronize TeXnology command-line client, version 1.21

$ context --version
mtx-context     | ConTeXt Process Management 1.04
```

 > btw, the script approach permits two way sync, so in texshop one can go 
from pdf to source and source to pdf

Could you send me the exact commands for that? I can't get any meaningful
output from `mtxrun --script synctex` either. It always prints me just an
empty line. All the options described in usage look like they are for going 
to
source code.

[1]: 
https://github.com/pwmt/zathura/blob/9bc3e9bfafc11a526b6f94d62b8da5ac209f6da0/zathura/synctex.c#L86
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