wallpaper selector: progress indicator for thumbnail generation

.config/quickshell/ii/services/Wallpapers.qml

@@ -23,9 +23,12 @@ Singleton {
         "jpg", "jpeg", "png", "webp", "avif", "bmp", "svg"
     ]
     property list<string> wallpapers: [] // List of absolute file paths (without file://)
+    readonly property bool thumbnailGenerationRunning: thumbgenProc.running
+    property real thumbnailGenerationProgress: 0
 
     signal changed()
     signal thumbnailGenerated(directory: string)
+    signal thumbnailGeneratedFile(filePath: string)
 
     // Executions
     Process {
@@ -126,13 +129,30 @@ Singleton {
         thumbgenProc.running = false
         thumbgenProc.command = [
             "bash", "-c",
-            `${thumbgenScriptPath} --size ${size} -d ${root.directory} || ${generateThumbnailsMagicScriptPath} --size ${size} -d ${root.directory}`,
+            `${thumbgenScriptPath} --size ${size} --machine_progress -d ${root.directory} || ${generateThumbnailsMagicScriptPath} --size ${size} -d ${root.directory}`,
         ]
+        root.thumbnailGenerationProgress = 0
         thumbgenProc.running = true
     }
     Process {
         id: thumbgenProc
         property string directory
+        stdout: SplitParser {
+            onRead: data => {
+                // print("thumb gen proc:", data)
+                let match = data.match(/PROGRESS (\d+)\/(\d+)/)
+                if (match) {
+                    const completed = parseInt(match[1])
+                    const total = parseInt(match[2])
+                    root.thumbnailGenerationProgress = completed / total
+                }
+                match = data.match(/FILE (.+)/)
+                if (match) {
+                    const filePath = match[1]
+                    root.thumbnailGeneratedFile(filePath)
+                }
+            }
+        }
         onExited: (exitCode, exitStatus) => {
             root.thumbnailGenerated(thumbgenProc.directory)
         }