\
**Category:** Help\
**Created:** [October 24, 2024, 5:39am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509 "2024-10-24T05:39:21Z")\
**Posts on this page:** 10\
**Page:** 1
**Author:**  [@halloleo](https://forum.graphviz.org/u/halloleo)\
**Post date:** [October 24, 2024, 5:39am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/1 "2024-10-24T05:39:22Z")
I am getting into gvpr scripts! 🙃
I have labels like the following in my dot file:
```auto
mynode [shape=myitem, label=< toki pona | sina pilin seme? >]
```
and I want to convert them with `gvpr` to
```auto
mynode [shape=record, label=< { toki pona | sina pilin seme? } >]
```
So I tried:
```auto
BEG_G {
string parts[int];
}
N[shape=="myitem"]{
$.shape="record";
if (index($.label, "|") > 0) {
split($.label, parts, "|");
$.label = "{" + parts[1] + "|" + parts[2]+"}";
}
}
```
However I get the error “_bad label format {| sina pilin seme? }_”. I guess this is due to the HTML-like nature of the source label. Do I need to use the `html()` function? (If so what do I use for graph `g`?)
Even when I take the italics directive `...` out, I get only
```auto
mynode [label="{| sina pilin seme? }", shape=record];
```
which shows `parts[1]` does not seem to polulte the first part “toki pona” of the source string.
How can I fix these two issues?
want to
---
**Author:**  [@steveroush](https://forum.graphviz.org/u/steveroush)\
**Post date:** [October 24, 2024, 3:15pm UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/2 "2024-10-24T15:15:11Z")
Yes you need the _magic_ **html** function. Also remember that **split** starts indexing at 0, not 1.
```auto
BEG_G {
string parts[int];
}
N[shape=="myitem"]{
$.shape="record";
if (index($.label, "|") > 0) {
split($.label, parts, "|");
// added call to **html** and reduced indexes by 1
$.label = html($G,"{" + parts[0] + "|" + parts[1]+"}");
}
}
```
---
**Author:**  [@halloleo](https://forum.graphviz.org/u/halloleo)\
**Post date:** [October 24, 2024, 11:22pm UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/3 "2024-10-24T23:22:09Z")
Thanks Steve. Good to know about `$G`! 🙂
However, when I try the `html()` function exactly as suggested, I get gibberish back as the label text in the gvpr output:
```
mynode [label="`ÕÉ", shape=record];
```
(plus some warnings on the command line like “_Pango-WARNING \*\*: Invalid UTF-8 string passed to pango\_layout\_set\_text()_”)
Even if i don’t use the `parts` array at all and set the label to a fixed string:
```auto
N[shape=="myitem"]{
if (index($.label, "|") > 0) {
$.shape="record";
$.label = html($G, "Hallo");
}
}
```
I get
```
mynode [label="¨15", shape=record];
```
Any idea what to do?
---
**Author:**  [@steveroush](https://forum.graphviz.org/u/steveroush)\
**Post date:** [October 25, 2024, 1:10am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/4 "2024-10-25T01:10:36Z")
Please show the input (.gv) file
---
**Author:**  [@halloleo](https://forum.graphviz.org/u/halloleo)\
**Post date:** [October 25, 2024, 3:17am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/5 "2024-10-25T03:17:58Z")
I attach the dot file and the gvpr script (renamed to
from adjust.gvpr to adjust.txt):
[ad-changed.dot](https://forum.graphviz.org/uploads/short-url/1iK33mrzYtuLixggMNZBHkhjkNs.dot) (978 Bytes)
[adjust.txt](https://forum.graphviz.org/uploads/short-url/1J2KVPKNJ41RrvEBKYo30Hl15fY.txt) (209 Bytes)
To get a graph image I call it like:
```
cat ad-changed.dot | gvpr -v -cf adjust.gvpr | dot -Tpng -oad-changed.png
```
Thanks for looking at this!
---
**Author:**  [@steveroush](https://forum.graphviz.org/u/steveroush)\
**Post date:** [October 25, 2024, 4:00am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/6 "2024-10-25T04:00:47Z")
It works fine for me (see below).
1. What Graphviz version? (dot -V)
2. It makes me want to say _font problem_ (see [Font FAQ | Graphviz](https://www.graphviz.org/faq/font/)), but can’t see why **gvpr** would be dealing with fonts. Please check if the _Pango_ error message was coming from **gvpr** or **dot**
My result:
---
**Author:**  [@halloleo](https://forum.graphviz.org/u/halloleo)\
**Post date:** [October 25, 2024, 4:21am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/7 "2024-10-25T04:21:37Z")
Interesting that it works for you!
> [@steveroush](#):
>
> What Graphviz version? (dot -V)
dot - graphviz version 2.30.1 (20200304.1809)
> [@steveroush](#):
>
> Please check if the _Pango_ error message was coming from **gvpr** or **dot**
It comes from dot, not from gvpr, but the funny characters are in the intermediate dot file `gvpr` produces:
```
mynode [label="¨15", shape=record];
```
---
**Author:**  [@steveroush](https://forum.graphviz.org/u/steveroush)\
**Post date:** [October 25, 2024, 4:41am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/8 "2024-10-25T04:41:05Z")
Time for a newer version of Graphviz
---
**Author:**  [@halloleo](https://forum.graphviz.org/u/halloleo)\
**Post date:** [October 26, 2024, 1:41am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/9 "2024-10-26T01:41:37Z")
True.
Just checked it with a current version on my Macbook and it works correctly like for you.
Now I just have to figure out a way to get a more current version on this older linux machine which is air-gapped / off-net…
---
**Author:**  [@halloleo](https://forum.graphviz.org/u/halloleo)\
**Post date:** [October 28, 2024, 2:28am UTC](https://forum.graphviz.org/t/how-to-modify-a-html-label-via-gvpr/2509/10 "2024-10-28T02:28:38Z")
Just to follow up:
I was able to compile and install version 10.0.1. (Version 12 did not co,pile because c++ under RHEL 7 is to old.)
And now I don’t get the Unicode issue anymore. Everything runs beautifully.
Thanks for your help, @steveroush!