info.go

package main

import (
	"fmt"
	"path/filepath"
	"runtime"
	"strings"

	"github.com/constabulary/gb"
	"github.com/constabulary/gb/cmd"
)

func init() {
	registerCommand(&cmd.Command{
		Name:      "info",
		UsageLine: `info`,
		Short:     "info returns information about this project",
		Long: `
info prints gb environment information.

Values:

	GB_PROJECT_DIR
		The root of the gb project.
	GB_SRC_PATH
		The list of gb project source directories.
	GB_PKG_DIR
		The path of the gb project's package cache.
	GB_BIN_SUFFIX
		The suffix applied any binary written to $GB_PROJECT_DIR/bin
	GB_GOROOT
		The value of runtime.GOROOT for the Go version that built this copy of gb.

info returns 0 if the project is well formed, and non zero otherwise.
`,
		Run:      info,
		AddFlags: addBuildFlags,
	})
}

func info(ctx *gb.Context, args []string) error {
	vars := []struct{ name, value string }{
		{"GB_PROJECT_DIR", ctx.Projectdir()},
		{"GB_SRC_PATH", joinlist(ctx.Srcdirs()...)},
		{"GB_PKG_DIR", ctx.Pkgdir()},
		{"GB_BIN_SUFFIX", ctx.Suffix()},
		{"GB_GOROOT", runtime.GOROOT()},
	}
	for _, v := range vars {
		fmt.Printf("%s=\"%s\"\n", v.name, v.value)
	}
	return nil
}

// joinlist joins path elements using the os specific separator.
// TODO(dfc) it probably gets this wrong on windows in some circumstances.
func joinlist(paths ...string) string {
	return strings.Join(paths, string(filepath.ListSeparator))
}