From 992ca558ddce46ec6bd4dcc0c2169b28a544f66c Mon Sep 17 00:00:00 2001
From: kenji <kenji@hakase>
Date: Sun, 11 Jan 2026 13:24:45 -0600
Subject: [PATCH] feat(swayimg): wrapper dynamically adjust image size without
 overlapping `waybar`

---
 apps/imv/default.nix | 78 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 64 insertions(+), 14 deletions(-)

diff --git a/apps/imv/default.nix b/apps/imv/default.nix
index 973bbbf..2c3806e 100644
--- a/apps/imv/default.nix
+++ b/apps/imv/default.nix
@@ -1,26 +1,76 @@
-{pkgs, ...}: {
-  home.packages = [pkgs.swayimg];
+{pkgs, ...}: let
+  # Max window size (leave room for waybar/hyprbars)
+  maxW = 2800;
+  maxH = 1100;
+
+  swayimg-wrapper = pkgs.writeShellScriptBin "swayimg-wrapper" ''
+    if [ -z "$1" ]; then
+      exec ${pkgs.swayimg}/bin/swayimg
+    fi
+
+    # Get image dimensions
+    dims=$(${pkgs.file}/bin/file -b "$1" | ${pkgs.gnugrep}/bin/grep -oP '\d+ ?x ?\d+' | head -1 | tr -d ' ')
+    if [ -z "$dims" ]; then
+      # Fallback if file doesn't report dimensions
+      exec ${pkgs.swayimg}/bin/swayimg "$@"
+    fi
+
+    imgW=$(echo "$dims" | cut -dx -f1)
+    imgH=$(echo "$dims" | cut -dx -f2)
+
+    # Calculate scale to fit within max bounds while preserving aspect ratio
+    scaleW=$(echo "scale=4; ${toString maxW} / $imgW" | ${pkgs.bc}/bin/bc)
+    scaleH=$(echo "scale=4; ${toString maxH} / $imgH" | ${pkgs.bc}/bin/bc)
+
+    # Use the smaller scale factor
+    if [ $(echo "$scaleW < $scaleH" | ${pkgs.bc}/bin/bc) -eq 1 ]; then
+      scale=$scaleW
+    else
+      scale=$scaleH
+    fi
+
+    # Only scale down, not up
+    if [ $(echo "$scale >= 1" | ${pkgs.bc}/bin/bc) -eq 1 ]; then
+      exec ${pkgs.swayimg}/bin/swayimg "$@"
+    fi
+
+    # Calculate new size
+    newW=$(echo "$imgW * $scale / 1" | ${pkgs.bc}/bin/bc)
+    newH=$(echo "$imgH * $scale / 1" | ${pkgs.bc}/bin/bc)
+
+    exec ${pkgs.swayimg}/bin/swayimg --size="$newW,$newH" "$@"
+  '';
+in {
+  home.packages = [pkgs.swayimg swayimg-wrapper];
 
   xdg.mimeApps = {
     enable = true;
     defaultApplications = {
-      "image/png" = "swayimg.desktop";
-      "image/jpeg" = "swayimg.desktop";
-      "image/gif" = "swayimg.desktop";
-      "image/webp" = "swayimg.desktop";
-      "image/bmp" = "swayimg.desktop";
-      "image/svg+xml" = "swayimg.desktop";
-      "image/tiff" = "swayimg.desktop";
+      "image/png" = "swayimg-wrapper.desktop";
+      "image/jpeg" = "swayimg-wrapper.desktop";
+      "image/gif" = "swayimg-wrapper.desktop";
+      "image/webp" = "swayimg-wrapper.desktop";
+      "image/bmp" = "swayimg-wrapper.desktop";
+      "image/svg+xml" = "swayimg-wrapper.desktop";
+      "image/tiff" = "swayimg-wrapper.desktop";
     };
   };
 
-  # swayimg config - window sizes to image, no black bars
-  xdg.configFile."swayimg/config".text = ''
-    [general]
-    size = image
+  xdg.desktopEntries.swayimg-wrapper = {
+    name = "Swayimg";
+    exec = "swayimg-wrapper %f";
+    terminal = false;
+    type = "Application";
+    mimeType = ["image/png" "image/jpeg" "image/gif" "image/webp" "image/bmp" "image/svg+xml" "image/tiff"];
+  };
 
+  # swayimg config
+  xdg.configFile."swayimg/config".text = ''
     [viewer]
-    scale = optimal
+    scale = fit
+
+    [info]
+    show = no
   '';
 
   wayland.windowManager.hyprland.settings.windowrulev2 = [