Attached is a syntax highlighting file for KDE's Kate text editor. To install copy "fasm.xml" to your "~/.kde/share/apps/katepart/syntax/" directory. (On my computer the directory is actually in "/usr/share/kde4/apps/katepart/syntax" ).

I want to eventually submit it to the project so any feedback is welcome.

Some examples...

I believe it is helpful to distinguish between preprocessor keywords (macro, equ, rept, ...) and assembler keywords (if, repeat, ...). In the last picture I noticed the segment registers are not highlighted similar to other registers?

In the past, I color coded instructions for different purposes: minimum processor requirement, flags effected, pipeline, ... Of course, some of these had very limited use, but made some tasks easier imho.There are many tweaks which work with a person's coding style. Like making label which start at the beginning of a line bold (excluding local labels). Or, using different highlighting for strings which are single quoted verses double quoted.

Kate looks very pretty.

https://kate-editor.org/

+ Distinguishes between instruction AND and operation AND, etc.
+ Control-flow high-lighting.
- Code folding doesn't work.
- Number format doesn't handle fasm's fancy stuff.

One of the best out-of-box experiences with fasm/fasmg I've seen in an editor. The high-lighting seems to have been done by someone that knows something about assembler. It's a huge download, but it does a lot. I see a lot of potential. If I spend more time with it, might get code folding working.

Current documentation on highlighting syntax:
https://docs.kde.org/trunk5/en/kate/katepart/highlight.html

Example:
https://kate-editor.org/syntax/data/html/highlight.asm-fasm.dark.html

Edit: found previous thread, so merged post to original.