What are conventions for filenames in Go?

I could find the conventions for naming packages in Go: no underscore between words, everything lowercase.

Does this convention apply to the filenames too?

Do you also put one struct in one file as if you did for a java class and then name the file after the struct?

Currently, if I have a struct WebServer, I put it in a file web_server.go.

There's a few guidelines to follow.

1. File names that begin with "." or "_" are ignored by the go tool
2. Files with the suffix _test.go are only compiled and run by the go test tool.
3. Files with os and architecture specific suffixes automatically follow those same constraints, e.g. name_linux.go will only build on linux, name_amd64.go will only build on amd64. This is the same as having a //+build amd64 line at the top of the file

See the go docs for more details: https://pkg.go.dev/cmd/go

In addition to the answer provided by JimB, regular file names are lower case, short, and without any sort of underscore or space. Generally, file names follow the same convention as package names. See the Package Names section of Effective Go.

See the strconv package for a good example.

Go is quite liberal in terms of how you organise your code within a package, usually it's whatever improves readability and understanding of your code. The best way to learn how this is done is to study the masters, i.e. have a browse though the standard library:

http://golang.org/src/pkg/

There are 2 rules I can think of however. When specifying code to be compiled for different platforms, you use the platform name as a suffix:

mypkg_linux.go         // only builds on linux systems
mypkg_windows_amd64.go // only builds on windows 64bit platforms

Also if you have a file called server.go, the tests for that file would be in server_test.go.

Usually underscore in filenames are used to assign platform/arch-only code, for example:

➜ cd $GOROOT/src/pkg/math/
➜ ls sqrt*s
sqrt_386.s  sqrt_amd64p32.s  sqrt_amd64.s  sqrt_arm.s

sqrt_386.s will only be read by the compiler on 32bit processors, sqrt_amd64.s on amd64, etc..

It can be any of the valid values of GOOS and/or GOARCH (ref.

file_windows_amd64.go will be only compiled on win64.

Long all small caps for filenames is a terrible idea!

Filenames do not have semantic meaning at go - they are not imported or referenced. Code files in go are compiled to the package they are assigned to as one unit.

Since the article in effective go don't include limitations on muti word filenames except underscore (for build, ignore, test and compile purposes) mixedCaps are the best option for multi word filenames convention. And it's recommend by the same article "effective go"

Tl;dr:

- smallallcupspackagename
|- veryLongFileName.go
|- veryLongFileName_test.go
|- veryLongFileName_amd64_windows.go

apart from all the other suggestions, the naming conventions should include (.). what it means is that if you have a module as "User", you are using routes, and models are defined inside the user module. Their name should be like user.models.go, user.route.go, user.service.go.
This is just clearer and easier to read.