grimblast: hide the grim cursor before taking a screenshot (#132)

* grimblast: try hiding the grim cursor before taking a screenshot

* grimblast: do not hardcode the cursor's new position

* grimblast: use the monitor's height for the cursor's new position

* grimblast: avoid breaking 'hyprctl' when having multiple monitors

* grimblast: fix typo

* grimblast: create a temporary virtual display to hide the cursor

* grimblast: make sure that the virtual display is not included in a screenshot

* grimblast: update CHANGELOG.md

* grimblast: add '' around variables.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+### 2025-03-01
+
+grimblast: hide the grim cursor before taking a screenshot
+
 ### 2024-08-02
 
 grimblast: changed method to check if another instance is running

grimblast/grimblast

@@ -175,16 +175,31 @@ check() {
   echo "   $COMMAND: $RESULT"
 }
 
+moveCursorPosition() {
+  initialCursorPosition=$(hyprctl cursorpos)
+  virtualDisplayName="grimblastVD"
+  focusedMonitorName=$(hyprctl -j monitors | jq -r '.[] | select( .focused == true ) | .name')
+
+  hyprctl output create headless "$virtualDisplayName" >/dev/null
+  hyprctl dispatch focusmonitor "$virtualDisplayName" >/dev/null
+}
+
+restoreCursorPosition() {
+  hyprctl dispatch focusmonitor "$focusedMonitorName" >/dev/null
+  hyprctl output remove "$virtualDisplayName" >/dev/null
+  hyprctl dispatch movecursor "${initialCursorPosition//,}" >/dev/null
+}
+
 takeScreenshot() {
   FILE=$1
   GEOM=$2
   OUTPUT=$3
   if [ -n "$OUTPUT" ]; then
-    grim ${CURSOR:+-c} ${SCALE:+-s "$SCALE"} -o "$OUTPUT" "$FILE" || die "Unable to invoke grim"
+    moveCursorPosition && grim ${CURSOR:+-c} ${SCALE:+-s "$SCALE"} -o "$OUTPUT" "$FILE" && restoreCursorPosition || die "Unable to invoke grim"
   elif [ -z "$GEOM" ]; then
     grim ${CURSOR:+-c} ${SCALE:+-s "$SCALE"} "$FILE" || die "Unable to invoke grim"
   else
-    grim ${CURSOR:+-c} ${SCALE:+-s "$SCALE"} -g "$GEOM" "$FILE" || die "Unable to invoke grim"
+    moveCursorPosition && grim ${CURSOR:+-c} ${SCALE:+-s "$SCALE"} -g "$GEOM" "$FILE" && restoreCursorPosition || die "Unable to invoke grim"
     resetFade
   fi
 }