How to properly add custom filetypes?

[ghost]

The language is based on Go. I created filetypes.Foo.conf and set Foo=*.foo; in filetype_extensions.conf. Foo is indeed appeared on Set Filetype but syntax highlighting for the language Foo is simply not work. When you opened a file name with extension .foo, it's treated as None and even if you manually set the language to be Foo via Set Filetype, there is absolutely no syntax highlighting. Strangely enough, if I set the language to Go via Set Filetype then I have syntax highlighting. If I edit filetype_extensions.conf to add .foo to the list of extensions of Go source file, then .foo files will be treated as Go and have syntax highlighting, too. Of course, this syntax highlighting is for Go and the keywords specific to the language Foo is not highlighted. I have read and followed the FAQ so I want to know what exactly did I do wrong or if I should make a bug report.

[elextr]

Did you set a lexer to use like this?

It is hard to debug with no information, better to put your filetype file in a gist and paste a link here (don't paste here and spam every watcher's email).

[ghost]

Copy filetypes.go into filetypes.Foo.conf. Edit filetypes.Foo.conf to set extension=foo and mime_type=text/x-foo. Set Foo=*.foo; in filetype_extensions.conf. Copy a sample Go source file into sample.foo (or simply replace the extension from .go to .foo). Open sample.foo in Geany. This is the steps to reproduce.

[elextr]

Go is a builtin filetype, so filetypes.go cannot simply be copied as a custom filetype, thats why my link above pointed to a custom filetype file (Scala as an example).

[ghost]

OK. It's working now. But I want to ask you for sure that it should be lexer_filetype=C or not. I don't think Go is a C-style language.

[elextr]

Well it should be whichever of the builtin filetypes is closest to your language, from the sound of it that would be Go.