feat: Auto resolution updates for sway when switching modes on monitor.

sway/resolution_updater.sh

@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+
+LOCK_FILE="/tmp/resolution_updater.lock"
+
+# Remove any stale lock file at startup
+[ -f "$LOCK_FILE" ] && rm -f "$LOCK_FILE"
+
+remove_lock() {
+    if [ -f "$LOCK_FILE" ]; then
+        rm -f "$LOCK_FILE"
+        echo "$(date '+%Y-%m-%d %H:%M:%S') - Lock file removed"
+    fi
+}
+
+trap remove_lock EXIT INT TERM
+
+update_display() {
+    if [ -f "$LOCK_FILE" ]; then
+        # Check lock file age
+        lock_age=$(($(date +%s) - $(stat -c %Y "$LOCK_FILE")))
+        if [ $lock_age -gt 10 ]; then
+            echo "$(date '+%Y-%m-%d %H:%M:%S') - Stale lock file detected (${lock_age}s old), removing"
+            remove_lock
+        else
+            echo "$(date '+%Y-%m-%d %H:%M:%S') - Lock file exists (${lock_age}s old), skipping update"
+            return
+        fi
+    fi
+
+    # Process each output and determine if changes are needed
+    local changes_needed=false
+    
+    local output_data=$(swaymsg -t get_outputs -r)
+    
+    # Process each output
+    echo "$output_data" | jq -r '.[] | 
+        {
+            name: .name, 
+            current_mode: {
+                width: .current_mode.width,
+                height: .current_mode.height,
+                refresh: .current_mode.refresh
+            },
+            current_scale: .scale,
+            modes: .modes
+        } | 
+        .best_mode = (.modes | map({width, height, refresh, pixels: (.width * .height)}) | sort_by(-.pixels, -.refresh) | first) |
+        "\(.name)|\(.current_mode.width)|\(.current_mode.height)|\(.current_mode.refresh)|\(.current_scale)|\(.best_mode.width)|\(.best_mode.height)|\(.best_mode.refresh)"
+    ' | while IFS="|" read -r name curr_width curr_height curr_refresh curr_scale best_width best_height best_refresh; do
+        # Determine target scale based on best resolution
+        target_scale=1
+        if [ "$best_height" -ge 2160 ]; then
+            target_scale=1.5
+        fi
+        
+        # Convert refresh rates to integers for comparison
+        curr_refresh_int=$(echo "$curr_refresh/1000" | bc)
+        best_refresh_int=$(echo "$best_refresh/1000" | bc)
+        
+        # Check if changes needed for this display
+        if [ "$curr_width" -ne "$best_width" ] ||
+           [ "$curr_height" -ne "$best_height" ] || 
+           [ "$curr_refresh_int" -ne "$best_refresh_int" ]; then
+            
+            touch "$LOCK_FILE"
+            changes_needed=true
+            
+            echo "$(date '+%Y-%m-%d %H:%M:%S') - Changing $name from ${curr_width}x${curr_height}@${curr_refresh_int}Hz (scale ${curr_scale}) to ${best_width}x${best_height}@${best_refresh_int}Hz (scale ${target_scale})"
+            
+            # Apply the resolution change
+            swaymsg output "$name" mode "${best_width}x${best_height}@${best_refresh_int}Hz"
+            
+            # Apply scaling
+            swaymsg output "$name" scale $target_scale
+        else
+            echo "$(date '+%Y-%m-%d %H:%M:%S') - No changes needed for $name - already at optimal settings"
+        fi
+    done
+    
+    # Remove lock file after a delay if changes were made
+    if $changes_needed; then
+        # Use a function for lock removal with delay
+        (sleep 3 && remove_lock) &
+    fi
+}
+
+swaymsg -m -t subscribe '["output"]' | jq --unbuffered -r '.change' | while read -r change; do
+    if [[ "$change" == "unspecified" || "$change" == "reconnect" || "$change" == "mode" ]]; then
+        echo "$(date '+%Y-%m-%d %H:%M:%S') - Display change detected: $change"
+        sleep 1
+        update_display
+    fi
+done