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remove.go
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remove.go
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package main
import (
"bufio"
"fmt"
"github.com/codegangsta/cli"
"github.com/evoL/gif/image"
"github.com/evoL/gif/store"
"io"
"os"
"regexp"
"strconv"
"strings"
)
func RemoveCommand(c *cli.Context) {
all := c.Bool("all")
really := c.Bool("really")
if !c.Args().Present() && !all {
cli.ShowCommandHelp(c, "remove")
os.Exit(1)
}
s := getStore()
defer s.Close()
filter := listFilter(c)
images, err := s.List(filter)
if err != nil {
fmt.Println("Error while fetching: " + err.Error())
os.Exit(1)
}
imageCount := len(images)
switch {
// case imageCount == 0: do nothing
case imageCount == 1:
removeSingle(s, &images[0], really)
case imageCount > 1:
if all {
removeAll(s, images, really)
} else {
removeMultiple(s, images)
}
}
}
func removeSingle(s *store.Store, img *image.Image, really bool) {
if really {
if err := s.Remove(img); err != nil {
fmt.Println("Error while removing image: " + err.Error())
os.Exit(1)
}
} else {
img.Print()
fmt.Println()
fmt.Print("Do you really want to remove this image? [y/n] ")
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() {
fmt.Println("IO Error: " + scanner.Err().Error())
os.Exit(1)
}
response := strings.TrimSpace(scanner.Text())
if regexp.MustCompile(`\A[yY]\z`).MatchString(response) {
if err := s.Remove(img); err != nil {
fmt.Println("Error while removing image: " + err.Error())
os.Exit(1)
}
}
}
}
func removeAll(s *store.Store, images []image.Image, really bool) {
if really {
if err := s.RemoveAll(images); err != nil {
fmt.Println("Error while removing image: " + err.Error())
os.Exit(1)
}
} else {
fmt.Printf("%v images\n", len(images))
image.PrintAll(images)
fmt.Println()
fmt.Print("Do you really want to remove those images? [y/n] ")
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() {
fmt.Println("IO Error: " + scanner.Err().Error())
os.Exit(1)
}
response := strings.TrimSpace(scanner.Text())
if regexp.MustCompile(`\A[yY]\z`).MatchString(response) {
if err := s.RemoveAll(images); err != nil {
fmt.Println("Error while removing image: " + err.Error())
os.Exit(1)
}
}
}
}
func removeMultiple(s *store.Store, images []image.Image) {
fmt.Printf("%v images\n", len(images))
writer := image.DefaultWriter()
for i, img := range images {
io.WriteString(writer, fmt.Sprintf("%v\t", i+1))
img.PrintTo(writer, false)
}
writer.Flush()
fmt.Println()
fmt.Println("Select images you want to remove: (Enter comma-separated numbers)")
fmt.Print("=> ")
scanner := bufio.NewScanner(os.Stdin)
if !scanner.Scan() {
fmt.Println()
os.Exit(1)
}
// Validate input
numberList := strings.TrimSpace(scanner.Text())
if !regexp.MustCompile(`\A\d+(\s*,\s*\d+)*\z`).MatchString(numberList) {
fmt.Println("Invalid input.")
os.Exit(1)
}
// Split into actual slice of strings
numbers := regexp.MustCompile(`\s*,\s*`).Split(numberList, -1)
for _, stringNumber := range numbers {
number, _ := strconv.Atoi(stringNumber)
index := number - 1
if err := s.Remove(&images[index]); err != nil {
fmt.Println("Error while removing image: " + err.Error())
}
}
}