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Copy pathconsole.go
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444 lines (397 loc) · 11.5 KB
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/*
* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
*
* 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 console implements console printing helpers
package console
import (
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"github.com/fatih/color"
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
)
var (
// DebugPrint enables/disables console debug printing.
DebugPrint = false
// Used by the caller to print multiple lines atomically. Exposed by Lock/Unlock methods.
publicMutex sync.Mutex
// Used internally by console.
privateMutex sync.Mutex
stderrColoredOutput = colorable.NewColorableStderr()
// Print prints a message.
Print = func(data ...interface{}) {
consolePrint("Print", Theme["Print"], data...)
}
// PrintC prints a message with color.
PrintC = func(data ...interface{}) {
consolePrint("PrintC", Theme["PrintC"], data...)
}
// Printf prints a formatted message.
Printf = func(format string, data ...interface{}) {
consolePrintf("Print", Theme["Print"], format, data...)
}
// Println prints a message with a newline.
Println = func(data ...interface{}) {
consolePrintln("Print", Theme["Print"], data...)
}
// Fatal print a error message and exit.
Fatal = func(data ...interface{}) {
consolePrint("Fatal", Theme["Fatal"], data...)
os.Exit(1)
}
// Fatalf print a error message with a format specified and exit.
Fatalf = func(format string, data ...interface{}) {
consolePrintf("Fatal", Theme["Fatal"], format, data...)
os.Exit(1)
}
// Fatalln print a error message with a new line and exit.
Fatalln = func(data ...interface{}) {
consolePrintln("Fatal", Theme["Fatal"], data...)
os.Exit(1)
}
// Error prints a error message.
Error = func(data ...interface{}) {
consolePrint("Error", Theme["Error"], data...)
}
// Errorf print a error message with a format specified.
Errorf = func(format string, data ...interface{}) {
consolePrintf("Error", Theme["Error"], format, data...)
}
// Errorln prints a error message with a new line.
Errorln = func(data ...interface{}) {
consolePrintln("Error", Theme["Error"], data...)
}
// Info prints a informational message.
Info = func(data ...interface{}) {
consolePrint("Info", Theme["Info"], data...)
}
// Infof prints a informational message in custom format.
Infof = func(format string, data ...interface{}) {
consolePrintf("Info", Theme["Info"], format, data...)
}
// Infoln prints a informational message with a new line.
Infoln = func(data ...interface{}) {
consolePrintln("Info", Theme["Info"], data...)
}
// Debug prints a debug message without a new line
// Debug prints a debug message.
Debug = func(data ...interface{}) {
if DebugPrint {
consolePrint("Debug", Theme["Debug"], data...)
}
}
// Debugf prints a debug message with a new line.
Debugf = func(format string, data ...interface{}) {
if DebugPrint {
consolePrintf("Debug", Theme["Debug"], format, data...)
}
}
// Debugln prints a debug message with a new line.
Debugln = func(data ...interface{}) {
if DebugPrint {
consolePrintln("Debug", Theme["Debug"], data...)
}
}
// Colorize prints message in a colorized form, dictated by the corresponding tag argument.
Colorize = func(tag string, data interface{}) string {
if isatty.IsTerminal(os.Stdout.Fd()) {
colorized, ok := Theme[tag]
if ok {
return colorized.SprintFunc()(data)
} // else: No theme found. Return as string.
}
return fmt.Sprint(data)
}
// Eraseline Print in new line and adjust to top so that we don't print over the ongoing progress bar.
Eraseline = func() {
consolePrintf("Print", Theme["Print"], "%c[2K\n", 27)
consolePrintf("Print", Theme["Print"], "%c[A", 27)
}
)
// wrap around standard fmt functions.
// consolePrint prints a message prefixed with message type and program name.
func consolePrint(tag string, c *color.Color, a ...interface{}) {
privateMutex.Lock()
defer privateMutex.Unlock()
switch tag {
case "Debug":
// if no arguments are given do not invoke debug printer.
if len(a) == 0 {
return
}
output := color.Output
color.Output = stderrColoredOutput
if isatty.IsTerminal(os.Stderr.Fd()) {
c.Print(ProgramName() + ": <DEBUG> ")
c.Print(a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": <DEBUG> ")
fmt.Fprint(color.Output, a...)
}
color.Output = output
case "Fatal":
fallthrough
case "Error":
// if no arguments are given do not invoke fatal and error printer.
if len(a) == 0 {
return
}
output := color.Output
color.Output = stderrColoredOutput
if isatty.IsTerminal(os.Stderr.Fd()) {
c.Print(ProgramName() + ": <ERROR> ")
c.Print(a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": <ERROR> ")
fmt.Fprint(color.Output, a...)
}
color.Output = output
case "Info":
// if no arguments are given do not invoke info printer.
if len(a) == 0 {
return
}
if isatty.IsTerminal(os.Stdout.Fd()) {
c.Print(ProgramName() + ": ")
c.Print(a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": ")
fmt.Fprint(color.Output, a...)
}
default:
if isatty.IsTerminal(os.Stdout.Fd()) {
c.Print(a...)
} else {
fmt.Fprint(color.Output, a...)
}
}
}
// consolePrintf - same as print with a new line.
func consolePrintf(tag string, c *color.Color, format string, a ...interface{}) {
privateMutex.Lock()
defer privateMutex.Unlock()
switch tag {
case "Debug":
// if no arguments are given do not invoke debug printer.
if len(a) == 0 {
return
}
output := color.Output
color.Output = stderrColoredOutput
if isatty.IsTerminal(os.Stderr.Fd()) {
c.Print(ProgramName() + ": <DEBUG> ")
c.Printf(format, a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": <DEBUG> ")
fmt.Fprintf(color.Output, format, a...)
}
color.Output = output
case "Fatal":
fallthrough
case "Error":
// if no arguments are given do not invoke fatal and error printer.
if len(a) == 0 {
return
}
output := color.Output
color.Output = stderrColoredOutput
if isatty.IsTerminal(os.Stderr.Fd()) {
c.Print(ProgramName() + ": <ERROR> ")
c.Printf(format, a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": <ERROR> ")
fmt.Fprintf(color.Output, format, a...)
}
color.Output = output
case "Info":
// if no arguments are given do not invoke info printer.
if len(a) == 0 {
return
}
if isatty.IsTerminal(os.Stdout.Fd()) {
c.Print(ProgramName() + ": ")
c.Printf(format, a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": ")
fmt.Fprintf(color.Output, format, a...)
}
default:
if isatty.IsTerminal(os.Stdout.Fd()) {
c.Printf(format, a...)
} else {
fmt.Fprintf(color.Output, format, a...)
}
}
}
// consolePrintln - same as print with a new line.
func consolePrintln(tag string, c *color.Color, a ...interface{}) {
privateMutex.Lock()
defer privateMutex.Unlock()
switch tag {
case "Debug":
// if no arguments are given do not invoke debug printer.
if len(a) == 0 {
return
}
output := color.Output
color.Output = stderrColoredOutput
if isatty.IsTerminal(os.Stderr.Fd()) {
c.Print(ProgramName() + ": <DEBUG> ")
c.Println(a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": <DEBUG> ")
fmt.Fprintln(color.Output, a...)
}
color.Output = output
case "Fatal":
fallthrough
case "Error":
// if no arguments are given do not invoke fatal and error printer.
if len(a) == 0 {
return
}
output := color.Output
color.Output = stderrColoredOutput
if isatty.IsTerminal(os.Stderr.Fd()) {
c.Print(ProgramName() + ": <ERROR> ")
c.Println(a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": <ERROR> ")
fmt.Fprintln(color.Output, a...)
}
color.Output = output
case "Info":
// if no arguments are given do not invoke info printer.
if len(a) == 0 {
return
}
if isatty.IsTerminal(os.Stdout.Fd()) {
c.Print(ProgramName() + ": ")
c.Println(a...)
} else {
fmt.Fprint(color.Output, ProgramName()+": ")
fmt.Fprintln(color.Output, a...)
}
default:
if isatty.IsTerminal(os.Stdout.Fd()) {
c.Println(a...)
} else {
fmt.Fprintln(color.Output, a...)
}
}
}
// Lock console.
func Lock() {
publicMutex.Lock()
}
// Unlock locked console.
func Unlock() {
publicMutex.Unlock()
}
// ProgramName - return the name of the executable program.
func ProgramName() string {
_, progName := filepath.Split(os.Args[0])
return progName
}
// Table - data to print in table format with fixed row widths.
type Table struct {
// per-row colors
RowColors []*color.Color
// per-column align-right flag (aligns left by default)
AlignRight []bool
// Left margin width for table
TableIndentWidth int
// Flag to print separator under heading. Row 0 is considered heading
HeaderRowSeparator bool
}
// NewTable - create a new Table instance. Takes per-row colors and
// per-column right-align flags and table indentation width (i.e. left
// margin width)
func NewTable(rowColors []*color.Color, alignRight []bool, indentWidth int) *Table {
return &Table{rowColors, alignRight, indentWidth, false}
}
// DisplayTable - prints the table
func (t *Table) DisplayTable(rows [][]string) error {
numRows := len(rows)
numCols := len(rows[0])
if numRows != len(t.RowColors) {
return fmt.Errorf("row count and row-colors mismatch")
}
// Compute max. column widths
maxColWidths := make([]int, numCols)
for _, row := range rows {
if len(row) != len(t.AlignRight) {
return fmt.Errorf("col count and align-right mismatch")
}
for i, v := range row {
if len([]rune(v)) > maxColWidths[i] {
maxColWidths[i] = len([]rune(v))
}
}
}
// Compute per-cell text with padding and alignment applied.
paddedText := make([][]string, numRows)
for r, row := range rows {
paddedText[r] = make([]string, numCols)
for c, cell := range row {
if t.AlignRight[c] {
fmtStr := fmt.Sprintf("%%%ds", maxColWidths[c])
paddedText[r][c] = fmt.Sprintf(fmtStr, cell)
} else {
extraWidth := maxColWidths[c] - len([]rune(cell))
fmtStr := fmt.Sprintf("%%s%%%ds", extraWidth)
paddedText[r][c] = fmt.Sprintf(fmtStr, cell, "")
}
}
}
// Draw table top border
segments := make([]string, numCols)
for i, c := range maxColWidths {
segments[i] = strings.Repeat("─", c+2)
}
indentText := strings.Repeat(" ", t.TableIndentWidth)
border := fmt.Sprintf("%s┌%s┐", indentText, strings.Join(segments, "┬"))
fmt.Println(border)
// Print the table with colors
for r, row := range paddedText {
if t.HeaderRowSeparator && r == 1 {
// Draw table header-row border
border = fmt.Sprintf("%s├%s┤", indentText, strings.Join(segments, "┼"))
fmt.Println(border)
}
fmt.Print(indentText + "│ ")
for c, text := range row {
t.RowColors[r].Print(text)
if c != numCols-1 {
fmt.Print(" │ ")
}
}
fmt.Println(" │")
}
// Draw table bottom border
border = fmt.Sprintf("%s└%s┘", indentText, strings.Join(segments, "┴"))
fmt.Println(border)
return nil
}
// RewindLines - uses terminal escape symbols to clear and rewind
// upwards on the console for `n` lines.
func RewindLines(n int) {
for i := 0; i < n; i++ {
fmt.Printf("\033[1A\033[K")
}
}