velvettear/slideshow
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pipe scaled image to feh's stdin instead of writing to a file

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This commit is contained in:
Daniel Sommer 2023-11-17 13:09:17 +01:00
parent 718bddb4ad
commit 8e245c0488
5 changed files with 75 additions and 36 deletions
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2
.vscode/launch.json vendored
View file

@ -8,7 +8,7 @@
"mode": "auto",
"program": "${workspaceFolder}/main.go",
"env":{
"SLIDESHOW_INTERVAL": "13",
"SLIDESHOW_INTERVAL": "10",
"SLIDESHOW_DIRECTORY": "/home/velvettear/images",
"SLIDESHOW_RESOLUTION": "600x1024",
"SLIDESHOW_LOGLEVEL": "debug"

2
go.mod
View file

@ -8,7 +8,7 @@ require github.com/fsnotify/fsnotify v1.7.0
require (
github.com/fatih/color v1.16.0 // indirect
github.com/kennykarnama/color-thief v0.0.0-20230222041546-c1bf65ec0808 // indirect
github.com/kennykarnama/color-thief v0.0.0-20230222041546-c1bf65ec0808
github.com/mattn/go-colorable v0.1.13 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
golang.org/x/sys v0.14.0 // indirect

5
internal/config/config.go
View file

@ -53,3 +53,8 @@ func Initialize() {
return
}
}
// check if a resolution has been specified
func IsResolutionSet() bool {
return len(Resolution) > 0
}

25
internal/slideshow/scale.go
View file

@ -3,9 +3,7 @@ package slideshow
import (
"errors"
"io"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
@ -15,33 +13,32 @@ import (
)
// scale an image
func scale(image string) (string, error) {
func scale(image string) ([]byte, error) {
timestamp := time.Now().UnixMilli()
scaledImage := filepath.Join(os.TempDir(), strconv.FormatInt(timestamp, 10)+"_"+filepath.Base(image))
arguments := []string{image, "-resize", config.Resolution + "^", "-gravity", "center", "-extent", config.Resolution, scaledImage}
cmd := exec.Command("convert", arguments...)
cmd := exec.Command("convert", image, "-resize", config.Resolution+"^", "-gravity", "center", "-extent", config.Resolution, "-")
stdout, stdoutError := cmd.StdoutPipe()
stderr, stderrError := cmd.StderrPipe()
var data []byte
cmd.Start()
if stdoutError != nil {
return scaledImage, stdoutError
return data, stdoutError
}
if stderrError != nil {
return scaledImage, stdoutError
return data, stdoutError
}
_, stdoutError = io.ReadAll(stdout)
data, stdoutError = io.ReadAll(stdout)
if stdoutError != nil {
return scaledImage, stdoutError
return data, stdoutError
}
errorBytes, stderrError := io.ReadAll(stderr)
if stderrError != nil {
return scaledImage, stdoutError
return data, stdoutError
}
cmd.Wait()
errorMessage := strings.TrimSpace(string(errorBytes))
if len(errorMessage) > 0 {
return scaledImage, errors.New(errorMessage)
return data, errors.New(errorMessage)
}
loggo.DebugTimed("successfully scaled image", timestamp, "image: "+image, "scaled image: "+scaledImage, "resolution: "+config.Resolution)
return scaledImage, nil
loggo.DebugTimed("successfully scaled image", timestamp, "image: "+image, "resolution: "+config.Resolution, "size: "+strconv.Itoa(len(data)))
return data, nil
}

77
internal/slideshow/slideshow.go
View file

@ -3,7 +3,6 @@ package slideshow
import (
"errors"
"io"
"os"
"os/exec"
"strconv"
"strings"
@ -20,37 +19,34 @@ func Start() {
loggo.Info("starting the image slideshow...", "interval: "+strconv.FormatFloat(config.Interval.Seconds(), 'f', 0, 64)+" seconds")
var sleepTime time.Duration
for {
var scaledImage string
image := watcher.GetRandomImage()
if len(config.Resolution) > 0 {
tmp, error := scale(image)
if config.IsResolutionSet() {
data, error := scale(image)
if error != nil {
loggo.Fatal("encountered an error scaling an image", "image: "+image, error.Error())
loggo.Error("encountered an error scaling an image", "image: "+image, error.Error())
continue
}
scaledImage = tmp
image = scaledImage
error = setBackgroundPiped(data)
if error != nil {
loggo.Error("encountered an error setting the background via pipe to feh's stdin", error.Error())
}
loggo.Info("set new scaled background image", "image: "+image, "resolution: "+config.Resolution)
} else {
error := setBackgroundImage(image)
if error != nil {
loggo.Error("encountered an error setting the background image", "image: "+image, error.Error())
}
loggo.Info("set new background image", "image: "+image)
}
if sleepTime > 0 {
time.Sleep(sleepTime)
}
sleepTime = time.Until(time.Now().Add(config.Interval))
error := setBackground(image)
if error != nil {
loggo.Error("encountered an error setting the background image", "image: "+image, error.Error())
}
loggo.Info("set new background image", "image: "+image)
if len(scaledImage) > 0 {
error = os.Remove(scaledImage)
if error != nil {
loggo.Error("encountered an error deleting a scaled image", "image: "+scaledImage)
}
}
}
}
// set the background image via 'feh'
func setBackground(image string) error {
func setBackgroundImage(image string) error {
cmd := exec.Command("feh", "--no-fehbg", "--bg-fill", image)
stdout, stdoutError := cmd.StdoutPipe()
stderr, stderrError := cmd.StderrPipe()
@ -76,3 +72,44 @@ func setBackground(image string) error {
}
return nil
}
// pipe data to 'feh' via stdin to set the background image
func setBackgroundPiped(data []byte) error {
cmd := exec.Command("feh", "--no-fehbg", "--bg-fill", "-")
stdin, stdinError := cmd.StdinPipe()
stdout, stdoutError := cmd.StdoutPipe()
stderr, stderrError := cmd.StderrPipe()
cmd.Start()
if stdinError != nil {
return stdinError
}
if stdoutError != nil {
return stdoutError
}
if stderrError != nil {
return stderrError
}
defer stdin.Close()
defer stdout.Close()
defer stderr.Close()
_, stdinError = stdin.Write(data)
if stdinError != nil {
return stdinError
} else {
stdin.Close()
}
_, stdoutError = io.ReadAll(stdout)
if stdoutError != nil {
return stdoutError
}
errorBytes, stderrError := io.ReadAll(stderr)
if stderrError != nil {
return stderrError
}
cmd.Wait()
error := strings.TrimSpace(string(errorBytes))
if len(error) > 0 {
return errors.New(error)
}
return nil
}