feat(gonf): support a GONF_HOST environment variable

cmd/gonf/cmd_build.go

@@ -24,7 +24,7 @@ where FLAG can be one or more of`, flag.ContinueOnError)
 		f.SetOutput(stdout)
 		f.Usage()
 	}
-	hostDir, err := hostFlagToHostDir(hostFlag)
+	hostDir, err := hostFlagToHostDir(hostFlag, getenv)
 	if err != nil {
 		f.Usage()
 		return err

cmd/gonf/cmd_deploy.go

@@ -23,7 +23,7 @@ where FLAG can be one or more of`, flag.ContinueOnError)
 		f.SetOutput(stdout)
 		f.Usage()
 	}
-	hostDir, err := hostFlagToHostDir(hostFlag)
+	hostDir, err := hostFlagToHostDir(hostFlag, getenv)
 	if err != nil {
 		f.Usage()
 		return err

cmd/gonf/hostflag.go

@@ -8,12 +8,17 @@ import (
 )
 
 func addHostFlag(f *flag.FlagSet) *string {
-	return f.String("host", "", "(REQUIRED) a valid $GONF_CONFIG/hosts/ subdirectory")
+	return f.String("host", "", "(REQUIRED) a valid $GONF_CONFIG/hosts/ subdirectory (overrides the GONF_HOST environment variable)")
 }
 
-func hostFlagToHostDir(hostFlag *string) (string, error) {
+func hostFlagToHostDir(hostFlag *string,
+	getenv func(string) string,
+) (string, error) {
 	if *hostFlag == "" {
-		return "", fmt.Errorf("required -host FLAG is missing")
+		*hostFlag = getenv("GONF_HOST")
+		if *hostFlag == "" {
+			return "", fmt.Errorf("the GONF_HOST environment variable is unset and the -host FLAG is missing. Please use one or the other")
+		}
 	}
 	hostDir := filepath.Join(configDir, "hosts", *hostFlag)
 	if info, err := os.Stat(hostDir); err != nil {

pkg/values.go

@@ -65,13 +65,13 @@ type IntValue struct {
 }
 
 func (i IntValue) Bytes() []byte {
-	return []byte(fmt.Sprint(i.value))
+	return []byte(strconv.Itoa(i.value))
 }
 func (i IntValue) Int() (int, error) {
 	return i.value, nil
 }
 func (i IntValue) String() string {
-	return fmt.Sprint(i.value)
+	return strconv.Itoa(i.value)
 }
 
 type StringsListValue struct {