Example from homepage lead to runtime error when trying revel command

[lboulard]

When running example in homepage https://revel.github.io/ using go 1.13.5:

go get github.com/revel/cmd/revel
git clone https://github.com/revel/examples $GOPATH/src/github.com/revel/examples
revel run github.com/revel/examples/chat

I only get a crash on Windows and Debian 10:

Windows:

 C:▶revel /v run github.com/revel/examples/chat
INFO  17:50:49   revel.go:94: Import path is absolute or not specified path=
INFO  17:50:49 command_config.go:133: Checking import path C:\Users\lboulard with C:\Users\lboulard\go
INFO  17:50:49   revel.go:94: Returned import path                     path= buildpath=C:\\Users\\lboulard\\go
INFO  17:50:49 command_config.go:301: Seeking remote package                   using= remote=github.com/revel/revel
INFO  17:50:49 command_config.go:301: Resolved called Seeking remote package   using= remote=github.com/revel/revel
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0x6468dc]

goroutine 1 [running]:
github.com/revel/cmd/utils.FindSrcPaths(0x0, 0x0, 0x9434e8, 0x16, 0x0, 0xc00013c090, 0x0, 0x0, 0x4, 0x4, ...)
        C:/Users/lboulard/go/src/github.com/revel/cmd/utils/file.go:358 +0x3dc
github.com/revel/cmd/model.(*CommandConfig).SetVersions(0xc0000021e0, 0x941dca, 0x14)
        C:/Users/lboulard/go/src/github.com/revel/cmd/model/command_config.go:301 +0xd1
github.com/revel/cmd/model.(*CommandConfig).UpdateImportPath(0xc0000021e0, 0x11, 0x3)
        C:/Users/lboulard/go/src/github.com/revel/cmd/model/command_config.go:154 +0x5f5
main.main()
        C:/Users/lboulard/go/src/github.com/revel/cmd/revel/revel.go:94 +0x16f

Debian 10:

$ revel -v run github.com/revel/examples/chat
INFO  17:51:42   revel.go:94: Returned import path                     path=github.com/revel/examples/chat buildpath=/home/lboulard/go
INFO  17:51:42 command_config.go:301: Seeking app package                      app=github.com/revel/examples/chat
INFO  17:51:42 command_config.go:301: Seeking remote package                   using=github.com/revel/examples/chat remote=github.com/revel/revel
INFO  17:51:42 command_config.go:301: Resolved called Seeking remote package   remote=github.com/revel/revel  using=github.com/revel/examples/chat
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6524ba]

goroutine 1 [running]:
github.com/revel/cmd/utils.FindSrcPaths(0x7ffdf1d5446c, 0x1e, 0x949953, 0x16, 0x0, 0xc00012c090, 0x0, 0x0, 0x4, 0x4, ...)
        /home/lboulard/go/src/github.com/revel/cmd/utils/file.go:358 +0x3ca
github.com/revel/cmd/model.(*CommandConfig).SetVersions(0xc00010e000, 0x948439, 0x14)
        /home/lboulard/go/src/github.com/revel/cmd/model/command_config.go:301 +0xca
github.com/revel/cmd/model.(*CommandConfig).UpdateImportPath(0xc00010e000, 0xe, 0x3)
        /home/lboulard/go/src/github.com/revel/cmd/model/command_config.go:154 +0x5f3
main.main()
        /home/lboulard/go/src/github.com/revel/cmd/revel/revel.go:94 +0x160

[brendensoares]

@lboulard thanks for filing this issue. We'll have to look into it to verify the root cause. For now I've marked it as a bug.

[notzippy]

This is a documentation issue, the problem is that the folder needed to be added to the GOPATH in order to run the examples. I will update the example apps to resolve this for 1.0 release