✨ feat(lock): add fingerprint support

Credit to @wooze-pao for providing the required code in #2162

dots/.config/quickshell/ii/modules/lock/Lock.qml

@@ -32,6 +32,16 @@ Scope {
 			}
 		}
 
+		Connections {
+			target: GlobalStates
+			function onScreenLockedChanged() {
+				if (GlobalStates.screenLocked) {
+					lockContext.reset();
+					lockContext.tryFingerUnlock();
+				}
+			}
+		}
+
 		onUnlocked: (targetAction) => {
 			// Perform the target action if it's not just unlocking
 			if (targetAction == LockContext.ActionEnum.Poweroff) {

dots/.config/quickshell/ii/modules/lock/LockContext.qml

@@ -2,6 +2,7 @@ import qs
 import qs.modules.common
 import QtQuick
 import Quickshell
+import Quickshell.Io
 import Quickshell.Services.Pam
 
 Scope {
@@ -18,8 +19,13 @@ Scope {
     property string currentText: ""
     property bool unlockInProgress: false
     property bool showFailure: false
+    property bool fingerprintsConfigured: false
     property var targetAction: LockContext.ActionEnum.Unlock
 
+    Component.onCompleted: {
+        fingerprintCheckProcess.running = true;
+    }
+
     function resetTargetAction() {
         root.targetAction = LockContext.ActionEnum.Unlock;
     }
@@ -37,6 +43,46 @@ Scope {
         root.clearText();
         root.unlockInProgress = false;
     }
+    
+    function tryFingerUnlock() {
+        fingerPam.start();
+    } 
+
+    function stopPam() {
+        fingerPam.abort();
+    }
+
+    Process {
+        id: fingerprintCheckProcess
+        command: ["bash", "-c", "fprintd-list $(whoami)"]
+        stdout: StdioCollector {
+            id: fingerprintOutputCollector
+            onStreamFinished: {
+                root.fingerprintsConfigured = fingerprintOutputCollector.text.includes("Fingerprints for user");
+            }
+        }
+        onExited: (exitCode, exitStatus) => {
+            if (exitCode !== 0) {
+                console.warn("fprintd-list command exited with error:", exitCode, exitStatus);
+                root.fingerprintsConfigured = false;
+            }
+        }
+    }
+
+    PamContext {
+        id: fingerPam
+
+        configDirectory: "pam"
+        config: "fprintd.conf"
+
+        onCompleted: result => {
+            if (result == PamResult.Success) {
+                root.unlocked(root.targetAction);
+            } else if (result == PamResult.Error){ // if timeout or etc..
+                tryFingerUnlock()
+            }
+        }
+    }
 
     Timer {
         id: passwordClearTimer

dots/.config/quickshell/ii/modules/lock/LockSurface.qml

@@ -98,6 +98,28 @@ MouseArea {
         scale: root.toolbarScale
         opacity: root.toolbarOpacity
 
+        // Fingerprint
+        Loader {
+            Layout.leftMargin: 10
+            Layout.alignment: Qt.AlignVCenter
+            active: root.context.fingerprintsConfigured // Bind to actual fingerprint availability
+            visible: root.context.fingerprintsConfigured
+
+            sourceComponent: Row {
+                spacing: 8
+
+                MaterialSymbol {
+                    id: fingerprintIcon
+                    anchors.verticalCenter: parent.verticalCenter
+                    fill: 1
+                    text: "fingerprint"
+                    iconSize: Appearance.font.pixelSize.huge
+                    color: Appearance.colors.colOnSurfaceVariant
+                    animateChange: true
+                }
+            }
+        }
+
         ToolbarTextField {
             id: passwordBox
             placeholderText: GlobalStates.screenUnlockFailed ? Translation.tr("Incorrect password") : Translation.tr("Enter password")

dots/.config/quickshell/ii/modules/lock/pam/fprintd.conf

@@ -0,0 +1 @@
+auth    sufficient    pam_fprintd.so