feat(display): pdf support

README.md

@@ -10,6 +10,7 @@ Open source solution for advanced remote control and coordination of one or more
 - Bash
 - Chromium
 - LibreOffice (optional, presentation view)
+- Xreader (optional, pdf view)
 - ImageMagick (optional, image preview)
 - ffmpeg (optional, video preview)
 - Ghostscript (optional, pdf preview)

display/pkg/main.go

@@ -47,20 +47,33 @@ func GetDeviceMac() (string, error) {
 	return "", fmt.Errorf("no suitable MAC address found")
 }
 
+var runningHelpProgram *exec.Cmd = nil
+
 func OpenPresentation(path string) error {
 	tempDirPath, err := os.MkdirTemp("", "plg-mudics-libreoffice-profile-")
 	if err != nil {
 		return fmt.Errorf("failed to create temporary profile directory: %w", err)
 	}
 
-	cmd := exec.Command("soffice", "--show", path, "--nologo", "--norestore", fmt.Sprintf("-env:UserInstallation=file:///%s", tempDirPath))
-	result := shared.RunShellCommand(cmd)
-	if result.ExitCode != 0 {
+	runningHelpProgram = exec.Command("soffice", "--show", path, "--nologo", "--norestore", fmt.Sprintf("-env:UserInstallation=file:///%s", tempDirPath))
+	result := shared.RunShellCommand(runningHelpProgram)
+	killedByParent := -1
+	if result.ExitCode != 0 && result.ExitCode != killedByParent {
 		return errors.New(result.Stderr)
 	}
 	return nil
 }
 
+func OpenPDF(path string) error {
+	runningHelpProgram = exec.Command("xreader", path, "--presentation")
+	result := shared.RunShellCommandNonBlocking(runningHelpProgram)
+	killedByParent := -1
+	if result.ExitCode != 0 && result.ExitCode != killedByParent {
+		return fmt.Errorf("could not open pdf: %s (%d)", result.Stderr, result.ExitCode)
+	}
+	return nil
+}
+
 type KeyAction int
 
 const (
@@ -154,3 +167,11 @@ func ResolveStorageFilePath(pathParam string) (string, bool, error) {
 
 	return fullPath, true, nil
 }
+
+func CloseRunningProgram() error {
+	if runningHelpProgram == nil {
+		return nil
+	}
+	err := runningHelpProgram.Process.Kill()
+	return err
+}

display/web/main.go

@@ -15,11 +15,9 @@ import (
 	"path/filepath"
 	shared "plg-mudics/shared"
 	"strings"
-	"time"
 
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
-	"github.com/micmonay/keybd_event"
 	"github.com/skip2/go-qrcode"
 
 	"plg-mudics/display/pkg"
@@ -266,6 +264,8 @@ func downloadFileRoute(ctx echo.Context) error {
 }
 
 func openFileRoute(ctx echo.Context) error {
+	var err error
+
 	pathParam := ctx.Param("path")
 	fullPath := ctx.Get("fullPath").(string)
 
@@ -277,7 +277,7 @@ func openFileRoute(ctx echo.Context) error {
 		return ctx.JSON(http.StatusInternalServerError, shared.ErrorResponse{Description: "Cant connect to display browser client"})
 	}
 
-	err := resetView()
+	err = resetView()
 	if err != nil {
 		slog.Error("Failed to reset view", "error", err)
 		return ctx.JSON(http.StatusInternalServerError, shared.ErrorResponse{Description: "Failed to reset view"})
@@ -295,15 +295,18 @@ func openFileRoute(ctx echo.Context) error {
 		imageTemplate(pathParam).Render(context.Background(), &templateBuffer)
 		sseConnection <- templateBuffer.String()
 	case ".pptx", ".odp":
-		err := pkg.OpenPresentation(fullPath)
-		if err != nil {
-			slog.Error("Failed to open presentation", "file", pathParam, "error", err)
-			return ctx.JSON(http.StatusInternalServerError, shared.ErrorResponse{Description: "Failed to open presentation"})
-		}
+		err = pkg.OpenPresentation(fullPath)
+	case ".pdf":
+		err = pkg.OpenPDF(fullPath)
 	default:
 		return ctx.JSON(http.StatusUnsupportedMediaType, shared.ErrorResponse{Description: "Unsupported file type"})
 	}
 
+	if err != nil {
+		slog.Error("Failed to open file", "file", pathParam, "error", err)
+		return ctx.JSON(http.StatusInternalServerError, shared.ErrorResponse{Description: "Failed to open file"})
+	}
+
 	slog.Info("Successfully run file", "file", pathParam)
 	return ctx.JSON(http.StatusOK, struct{}{})
 }
@@ -377,16 +380,9 @@ func previewRoute(ctx echo.Context) error {
 
 // Reset previous file views so they dont collide with the new one
 func resetView() error {
-	var err error
-
-	err = pkg.KeyboardInput(keybd_event.VK_ESC, pkg.KeyPress)
+	err := pkg.CloseRunningProgram()
 	if err != nil {
-		return fmt.Errorf("failed to send ESC key: %w", err)
-	}
-	time.Sleep(400 * time.Millisecond)
-	err = pkg.KeyboardInput(keybd_event.VK_ESC, pkg.KeyRelease)
-	if err != nil {
-		return fmt.Errorf("failed to send ESC key: %w", err)
+		return fmt.Errorf("failed to close running program: %w", err)
 	}
 
 	sseConnection <- ""

nixos/configuration.nix

@@ -91,6 +91,7 @@
     nushell
     unzip
     iputils
+    xreader
 
     # Libraries
     imagemagick

shared/main.go

@@ -2,8 +2,10 @@ package shared
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"os/exec"
+	"time"
 )
 
 type CommandResponse struct {
@@ -24,6 +26,34 @@ func RunShellCommand(cmd *exec.Cmd) CommandResponse {
 	cmd.Stderr = &stderr
 	err := cmd.Run()
 
+	return parseCmdResult(cmd, stdout, stderr, err)
+
+}
+
+func RunShellCommandNonBlocking(cmd *exec.Cmd) CommandResponse {
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+	cmd.Start()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 200*time.Millisecond)
+	defer cancel()
+
+	done := make(chan error, 1)
+
+	go func() {
+		done <- cmd.Wait()
+	}()
+
+	select {
+	case <-ctx.Done():
+		return CommandResponse{}
+	case err := <-done:
+		return parseCmdResult(cmd, stdout, stderr, err)
+	}
+}
+
+func parseCmdResult(cmd *exec.Cmd, stdout, stderr bytes.Buffer, err error) CommandResponse {
 	commandOutput := CommandResponse{
 		Stdout:   stdout.String(),
 		Stderr:   stderr.String(),