required package does not exist

[pebbe]

this package listed in go.mod does not exist: github.com/russross/blackfriday/v2

[depado]

Strange, it does exist 🤔

[TACIXAT]

They've switched to gopkg.in/russross/blackfriday.v2. I can't go get github.com/russross/blackfriday/v2. This repo seems to use that so I get the failure too. It is odd though because play.golang.org works fine with the old url.

[depado]

It seems that issue is being discussed over here russross/blackfriday#587
I don't get why it suddenly broke.
Just out of curiosity, how are you trying to go get the v2 version ?

[depado]

So after a quick test, I can't reproduce.

// file: go.mod
module github.com/Depado/bfchromatest

go 1.14

require (
	github.com/Depado/bfchroma v1.2.0
	github.com/alecthomas/chroma v0.7.3 // indirect
	github.com/russross/blackfriday/v2 v2.0.1
)

// file: main.go
package main

import (
	"fmt"

	"github.com/Depado/bfchroma"

	bf "github.com/russross/blackfriday/v2"
)

func main() {
	md := []byte("# hello world")
	html := bf.Run([]byte(md), bf.WithRenderer(bfchroma.NewRenderer()))

	fmt.Println(string(html))
}

$ go run main.go
<h1>hello world</h1>

Even after I go get -u, it doesn't fail.
Are you both using go modules ?

[pebbe]

Start with an empty ~/go:

$ go get -v github.com/Depado/bfchroma
github.com/Depado/bfchroma (download)
created GOPATH=/home/peter/go; see 'go help gopath'
github.com/alecthomas/chroma (download)
github.com/dlclark/regexp2 (download)
github.com/danwakefield/fnmatch (download)
github.com/russross/blackfriday (download)
package github.com/russross/blackfriday/v2: cannot find package "github.com/russross/blackfriday/v2" in any of:
        /my/opt/go/src/github.com/russross/blackfriday/v2 (from $GOROOT)
        /home/peter/go/src/github.com/russross/blackfriday/v2 (from $GOPATH)

go version go1.14.3 linux/amd64

[depado]

Alright, I'm completely lost, if anyone has the knowledge to help me out with this one.
I'm starting fresh with a new GOPATH every time using mktemp.

Outside of a go module project

env GOPATH=(mktemp -d -t gopath-XXXXXXXXXX) go get -v github.com/Depado/bfchroma
github.com/Depado/bfchroma (download)
github.com/alecthomas/chroma (download)
github.com/dlclark/regexp2 (download)
github.com/danwakefield/fnmatch (download)
github.com/russross/blackfriday (download)
package github.com/russross/blackfriday/v2: cannot find package "github.com/russross/blackfriday/v2" in any of:
	/home/paul/go/src/github.com/russross/blackfriday/v2 (from $GOROOT)
	/tmp/gopath-WHL5VOgK5F/src/github.com/russross/blackfriday/v2 (from $GOPATH)

Inside a go module project

I'll reuse the one described in my latest comment:

// file: go.mod
module github.com/Depado/bfchromatest

go 1.14

require (
	github.com/Depado/bfchroma v1.2.0
	github.com/alecthomas/chroma v0.7.3 // indirect
	github.com/russross/blackfriday/v2 v2.0.1
)

env GOPATH=(mktemp -d -t gopath-XXXXXXXXXX) go get -v github.com/Depado/bfchroma
go: downloading github.com/Depado/bfchroma v1.2.0
go: downloading github.com/alecthomas/chroma v0.7.3
go: downloading github.com/russross/blackfriday/v2 v2.0.1
go: downloading github.com/shurcooL/sanitized_anchor_name v1.0.0
go: downloading github.com/dlclark/regexp2 v1.2.0
go: downloading github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964
github.com/danwakefield/fnmatch
github.com/shurcooL/sanitized_anchor_name
github.com/dlclark/regexp2/syntax
github.com/russross/blackfriday/v2
github.com/dlclark/regexp2
github.com/alecthomas/chroma
github.com/alecthomas/chroma/lexers/internal
github.com/alecthomas/chroma/formatters/html
github.com/alecthomas/chroma/styles
github.com/alecthomas/chroma/lexers/b
github.com/alecthomas/chroma/lexers/a
github.com/alecthomas/chroma/lexers/p
github.com/alecthomas/chroma/lexers/e
github.com/alecthomas/chroma/lexers/j
github.com/alecthomas/chroma/lexers/f
github.com/alecthomas/chroma/lexers/i
github.com/alecthomas/chroma/lexers/k
github.com/alecthomas/chroma/lexers/l
github.com/alecthomas/chroma/lexers/n
github.com/alecthomas/chroma/lexers/o
github.com/alecthomas/chroma/lexers/q
github.com/alecthomas/chroma/lexers/r
github.com/alecthomas/chroma/lexers/d
github.com/alecthomas/chroma/lexers/t
github.com/alecthomas/chroma/lexers/w
github.com/alecthomas/chroma/lexers/x
github.com/alecthomas/chroma/lexers/y
github.com/alecthomas/chroma/lexers/v
github.com/alecthomas/chroma/lexers/c
github.com/alecthomas/chroma/lexers/h
github.com/alecthomas/chroma/lexers/circular
github.com/alecthomas/chroma/lexers/g
github.com/alecthomas/chroma/lexers/m
github.com/alecthomas/chroma/lexers/s
github.com/alecthomas/chroma/lexers
github.com/Depado/bfchroma

I can't seem to figure out the difference between go geting a package inside a project and go geting a package outside of a project. I tried ensuring this is the latest version of the repo using @master when go getting but that doesn't change anything since master points to the v1.2.0 release anyway.