Add support to go run to use Buildtags

[pjfoley]

Files used

main.go

package main

import "fmt"
import "${PATHTOREPOSITORY}/config

func main() {
    if config.PrintToConsole {
        fmt.Println("Developing application ....")
    } else {
        fmt.Println("In Production ....")
    }
}

config/constants_coding.go

// +build coding

package config

const PrintToConsole = true

config/constants_production.go

// +build !coding

package config

const PrintToConsole = false

What did you do? (required. The issue will be closed when not provided.)

Within the main.go file I set the Build Tag and then issued a go run from within VIM.

:GoBuildTags coding
:GoRun

What did you expect to happen?

I expected it to print:

Developing application ....

Press ENTER or type command to continue

What happened instead?

In Production ....

Press ENTER or type command to continue

Configuration (MUST fill this out):

• vim-go version:

I did a :PlugUpdate
Doing a git log in the vim-go directory the commit checked out is f140383

• vimrc you used to reproduce (use a minimal vimrc with other plugins disabled; do not link to a 2,000 line vimrc):

Base vimrc with plug and vim-go installed.

• Vim version (first three lines from :version):
  :version
  VIM - Vi IMproved 8.0 (2016 Sep 12, compiled Sep 30 2017 18:21:38)
  Included patches: 1-197, 322, 377-378, 550, 703, 706-707
  Modified by [email protected]
  Compiled by [email protected]

• Go version (go version):
  go version go1.10.2 linux/amd64

• Go environment (go env):

GOARCH="amd64"
GOBIN=""
GOCACHE="/home/jsmith/.cache/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/jsmith/go"
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build253018108=/tmp/go-build -gno-record-gcc-switches"

[pjfoley]

I should add that this commit #1705 seems to have added the capability to most of the other Go commands.