How to use custom packages

Question

I m trying to create and use a custom package in Go  It s probably something very obvious but I cannot find much information about this  Basically  I have these two files in the same folder   mylib go  package mylib  type SomeType struct        main go  package main  import        mylib     func main          When I try to go run main go  I get this error   main go 4 2  import  mylib   cannot find package   I ve tried to run go build mylib go first but it doesn t seem to be doing anything  no file generated  no error message   So any idea how I could do this

User · Answer

I try so many ways but the best I use go.mod and put

module nameofProject.com

and then i import from same project I use

import("nameofProject.com/folder")

It's very useful to create project in any place

User · Answer

another solution  add src myproject to  GOPATH   Then import  mylib  will compile

User · Answer

For a project hosted on GitHub  here s what people usually do   github com    laike9m      myproject        mylib          mylib go                   main go   mylib go  package mylib        main go  import  github com laike9m myproject mylib

User · Answer

For this kind of folder structure   main go mylib    mylib go   The simplest way is to use this   import          mylib

User · Answer

I am an experienced programmer  but  quite new into Go world   And I confess I ve faced few difficulties to understand Go     I faced this same problem when trying to organize my go files in sub-folders  The way I did it    GO Directory   the one assigned to  GOPATH    GO Directory   the one assigned to  GOPATH   MyProject       main go       Entites       Fiboo    in my case  fiboo is a database name           Client go    in my case  Client is a table name   On File MyProject Entities Fiboo Client go  package Fiboo  type Client struct      ID int     name string     on file MyProject main go  package main  import      Fiboo    Entity Fiboo      var TableClient  Fiboo Client  func main        TableClient ID   1     TableClient name    Hugo          do your things here       I am running Go 1 9 on Ubuntu 16 04     And remember guys  I am newbie on Go  If what I am doing is bad practice  let me know

User · Answer

First  be sure to read and understand the  How to write Go code  document   The actual answer depends on the nature of your  custom package    If it s intended to be of general use  consider employing the so-called  Github code layout   Basically  you make your library a separate go get-table project   If your library is for internal use  you could go like this    Place the directory with library files under the directory of your project  In the rest of your project  refer to the library using its path relative to the root of your workspace containing the project    To demonstrate   src    myproject      mylib        mylib go               main go   Now  in the top-level main go  you could import  myproject mylib  and it would work OK

[import] How to use custom packages

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