Golang-如何通过示例程序来安排我的工作区？

Question

I'm still trying to get my head around the Go workspace layout. I have a package, todinfo and a sample program which uses it, untod.

I currently have this arrangement of directories:

$GOPATH
+- bin...
+- pkg ...
+- src
   +- github.com
      +- longborough
         +- (others)...
         +- todinfo
            +- todinfo.go
            +- untod.go

I originally developed these two programs in separate directories. However, since untod is really part of the todinfo package, it seems more sensible to package it up as a single project, in the same directory.

But when I try to install (I've wrapped the reply onto three lines for clarity):

D:\Development\Go\src\github.com\longborough\todinfo>go install
 can''t load package: package github.com/longborough/todinfo: 
 found packages todinfo (todinfo.go) and main (untod.go) 
 in D:\Development\Go\src\github.com\longborough\todinfo

I hope I'm mistaken, but this smells a bit like Java, at least to the uninitiated.

What am I doing wrong? What Go commands should I use to install the package and then install the sample? Or, what is the correct directory arrangement?

Answer 1

This got me too. Think of it this way: untod is not part of the todinfo package, it's a consumer of the todinfo package (library). In fact, main is not really a package at all, just a marker to say that it's got an entrypoint and should be compiled into a binary.

TLDR: you can put untod anywhere. In the root is probably sensible: it will then be named whatever the last dir component of your $GOPATH is. Alternatively, put it in cmd/untod/untod.go if you've got multiple binaries.

After some more development, you might consider making a separate repo like github.com/longborough/todinfo-bins to keep them apart.

Dave Cheney has some decent advice on the subject.