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|
package util
import (
"fmt"
"os"
"time"
"strings"
"strconv"
"unicode/utf8"
"path/filepath"
"runtime"
)
// Prompt user to input data
func Prompt(msg string) string {
fmt.Printf(msg)
var str string
fmt.Scanln(&str)
return str
}
// Returns true if file/directory exists
func FileExists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
return false
}
func Mkdir(path string) error {
dir := filepath.Dir(path)
if FileExists(dir) {
return nil
}
return os.Mkdir(dir, 0700)
}
// Returns the users home dir
func Homedir() string {
if runtime.GOOS == "windows" {
return os.Getenv("APPDATA")
}
return os.Getenv("HOME")
}
func FormatBool(b bool) string {
return strings.Title(strconv.FormatBool(b))
}
func FileSizeFormat(bytes int64) string {
units := []string{"B", "KB", "MB", "GB", "TB", "PB"}
var i int
value := bytes
for value > 1000 {
value /= 1000
i++
}
return fmt.Sprintf("%d %s", value, units[i])
}
// Truncates string to given max length, and inserts ellipsis into
// the middle of the string to signify that the string has been truncated
func TruncateString(str string, maxRunes int) string {
indicator := "..."
// Number of runes in string
runeCount := utf8.RuneCountInString(str)
// Return input string if length of input string is less than max length
// Input string is also returned if max length is less than 9 which is the minmal supported length
if runeCount <= maxRunes || maxRunes < 9 {
return str
}
// Number of remaining runes to be removed
remaining := (runeCount - maxRunes) + utf8.RuneCountInString(indicator)
var truncated string
var skip bool
for leftOffset, char := range str {
rightOffset := runeCount - (leftOffset + remaining)
// Start skipping chars when the left and right offsets are equal
// Or in the case where we wont be able to do an even split: when the left offset is larger than the right offset
if leftOffset == rightOffset || (leftOffset > rightOffset && !skip) {
skip = true
truncated += indicator
}
if skip && remaining > 0 {
// Skip char and decrement the remaining skip counter
remaining--
continue
}
// Add char to result string
truncated += string(char)
}
// Return truncated string
return truncated
}
func ISODateToLocal(iso string) string {
t, err := time.Parse(time.RFC3339, iso)
if err != nil {
return iso
}
local := t.Local()
year, month, day := local.Date()
hour, min, sec := local.Clock()
return fmt.Sprintf("%04d-%02d-%02d %02d:%02d:%02d", year, month, day, hour, min, sec)
}
func MeasureTransferRate() func(int64)string {
start := time.Now()
return func(bytes int64) string {
seconds := int64(time.Now().Sub(start).Seconds())
if seconds < 1 {
return fmt.Sprintf("%s/s", FileSizeFormat(bytes))
}
bps := bytes / seconds
return fmt.Sprintf("%s/s", FileSizeFormat(bps))
}
}
// Prints a map in the provided order with one key-value-pair per line
func Print(m map[string]string, keyOrder []string) {
for _, key := range keyOrder {
value, ok := m[key]
if ok && value != "" {
fmt.Printf("%s: %s\n", key, value)
}
}
}
// Prints items in columns with header and correct padding
func PrintColumns(items []map[string]string, keyOrder []string, columnSpacing int) {
// Create header
header := make(map[string]string)
for _, key := range keyOrder {
header[key] = key
}
// Add header as the first element of items
items = append([]map[string]string{header}, items...)
// Get a padding function for each column
padFns := make(map[string]func(string)string)
for _, key := range keyOrder {
padFns[key] = columnPadder(items, key, columnSpacing)
}
// Loop, pad and print items
for _, item := range items {
var line string
// Add each column to line with correct padding
for _, key := range keyOrder {
value, _ := item[key]
line += padFns[key](value)
}
// Print line
fmt.Println(line)
}
}
// Returns a padding function, that pads input to the longest string in items
func columnPadder(items []map[string]string, key string, spacing int) func(string)string {
// Holds length of longest string
var max int
// Find the longest string of type key in the array
for _, item := range items {
str := item[key]
length := utf8.RuneCountInString(str)
if length > max {
max = length
}
}
// Return padding function
return func(str string) string {
column := str
for utf8.RuneCountInString(column) < max + spacing {
column += " "
}
return column
}
}
|
