commands: Extract some common types into its own file - hugo - [fork] hugo port for 9front
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       ---
 (DIR) commit 018602c46db8d729af2871bd5f4c1e7480420f09
 (DIR) parent 2f0d98a19b021d03930003217b0519afaef3a391
 (HTM) Author: Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
       Date:   Tue, 10 Apr 2018 08:55:13 +0200
       
       commands: Extract some common types into its own file
       
       See #4598
       
       Diffstat:
         A commands/helpers.go                 |      62 +++++++++++++++++++++++++++++++
         M commands/hugo.go                    |      48 +------------------------------
       
       2 files changed, 63 insertions(+), 47 deletions(-)
       ---
 (DIR) diff --git a/commands/helpers.go b/commands/helpers.go
       @@ -0,0 +1,62 @@
       +// Copyright 2018 The Hugo Authors. All rights reserved.
       +//
       +// Licensed under the Apache License, Version 2.0 (the "License");
       +// you may not use this file except in compliance with the License.
       +// You may obtain a copy of the License at
       +// http://www.apache.org/licenses/LICENSE-2.0
       +//
       +// Unless required by applicable law or agreed to in writing, software
       +// distributed under the License is distributed on an "AS IS" BASIS,
       +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
       +// See the License for the specific language governing permissions and
       +// limitations under the License.
       +
       +// Package commands defines and implements command-line commands and flags
       +// used by Hugo. Commands and flags are implemented using Cobra.
       +package commands
       +
       +const (
       +        ansiEsc    = "\u001B"
       +        clearLine  = "\r\033[K"
       +        hideCursor = ansiEsc + "[?25l"
       +        showCursor = ansiEsc + "[?25h"
       +)
       +
       +// commandError is an error used to signal different error situations in command handling.
       +type commandError struct {
       +        s         string
       +        userError bool
       +}
       +
       +func (c commandError) Error() string {
       +        return c.s
       +}
       +
       +func (c commandError) isUserError() bool {
       +        return c.userError
       +}
       +
       +func newUserError(a ...interface{}) commandError {
       +        return commandError{s: fmt.Sprintln(a...), userError: true}
       +}
       +
       +func newSystemError(a ...interface{}) commandError {
       +        return commandError{s: fmt.Sprintln(a...), userError: false}
       +}
       +
       +func newSystemErrorF(format string, a ...interface{}) commandError {
       +        return commandError{s: fmt.Sprintf(format, a...), userError: false}
       +}
       +
       +// Catch some of the obvious user errors from Cobra.
       +// We don't want to show the usage message for every error.
       +// The below may be to generic. Time will show.
       +var userErrorRegexp = regexp.MustCompile("argument|flag|shorthand")
       +
       +func isUserError(err error) bool {
       +        if cErr, ok := err.(commandError); ok && cErr.isUserError() {
       +                return true
       +        }
       +
       +        return userErrorRegexp.MatchString(err.Error())
       +}
 (DIR) diff --git a/commands/hugo.go b/commands/hugo.go
       @@ -1,4 +1,4 @@
       -// Copyright 2016 The Hugo Authors. All rights reserved.
       +// Copyright 2018 The Hugo Authors. All rights reserved.
        //
        // Licensed under the Apache License, Version 2.0 (the "License");
        // you may not use this file except in compliance with the License.
       @@ -59,13 +59,6 @@ import (
        // provide a cleaner external API, but until then, this is it.
        var Hugo *hugolib.HugoSites
        
       -const (
       -        ansiEsc    = "\u001B"
       -        clearLine  = "\r\033[K"
       -        hideCursor = ansiEsc + "[?25l"
       -        showCursor = ansiEsc + "[?25h"
       -)
       -
        // Reset resets Hugo ready for a new full build. This is mainly only useful
        // for benchmark testing etc. via the CLI commands.
        func Reset() error {
       @@ -73,45 +66,6 @@ func Reset() error {
                return nil
        }
        
       -// commandError is an error used to signal different error situations in command handling.
       -type commandError struct {
       -        s         string
       -        userError bool
       -}
       -
       -func (c commandError) Error() string {
       -        return c.s
       -}
       -
       -func (c commandError) isUserError() bool {
       -        return c.userError
       -}
       -
       -func newUserError(a ...interface{}) commandError {
       -        return commandError{s: fmt.Sprintln(a...), userError: true}
       -}
       -
       -func newSystemError(a ...interface{}) commandError {
       -        return commandError{s: fmt.Sprintln(a...), userError: false}
       -}
       -
       -func newSystemErrorF(format string, a ...interface{}) commandError {
       -        return commandError{s: fmt.Sprintf(format, a...), userError: false}
       -}
       -
       -// Catch some of the obvious user errors from Cobra.
       -// We don't want to show the usage message for every error.
       -// The below may be to generic. Time will show.
       -var userErrorRegexp = regexp.MustCompile("argument|flag|shorthand")
       -
       -func isUserError(err error) bool {
       -        if cErr, ok := err.(commandError); ok && cErr.isUserError() {
       -                return true
       -        }
       -
       -        return userErrorRegexp.MatchString(err.Error())
       -}
       -
        // HugoCmd is Hugo's root command.
        // Every other command attached to HugoCmd is a child command to it.
        var HugoCmd = &cobra.Command{