2 files changed, 113 insertions, 0 deletions
diff --git a/modules/scripts/activate-windows/default.nix b/modules/scripts/activate-windows/default.nix
new file mode 100644
index 0000000..441410f
--- /dev/null
+++ b/modules/scripts/activate-windows/default.nix
@@ -0,0 +1,23 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  inherit ((import ../lib.nix { inherit lib pkgs; })) mkScriptModule;
+  base = mkScriptModule {
+    name = "eww-active-windows";
+    path = ./script.sh;
+    description = "Outputs JSON array of active windows for eww bar\nUsed by eww to display window icons in the sidebar";
+    deps = [
+      pkgs.bash
+      pkgs.jq
+    ];
+    inherit config;
+  };
+in
+{
+  options = base.options;
+  config = base.moduleConfig;
+}
diff --git a/modules/scripts/activate-windows/script.sh b/modules/scripts/activate-windows/script.sh
new file mode 100644
index 0000000..2abe394
--- /dev/null
+++ b/modules/scripts/activate-windows/script.sh
@@ -0,0 +1,90 @@
+#!/usr/bin/env bash
+
+CACHE_FILE="${XDG_CACHE_HOME:-$HOME/.cache}/eww-icon-cache.tsv"
+mkdir -p "$(dirname "$CACHE_FILE")"
+touch "$CACHE_FILE"
+
+APP_DIRS=(
+  "$HOME/.local/share/applications"
+  "$HOME/.nix-profile/share/applications"
+  "/etc/profiles/per-user/$USER/share/applications"
+  "/run/current-system/sw/share/applications"
+  "$HOME/.local/share/flatpak/exports/share/applications"
+  "/var/lib/flatpak/exports/share/applications"
+)
+
+ICON_DIRS=(
+  "$HOME/.local/share/icons"
+  "$HOME/.icons"
+  "$HOME/.nix-profile/share/icons"
+  "/etc/profiles/per-user/$USER/share/icons"
+  "/run/current-system/sw/share/icons"
+  "$HOME/.nix-profile/share/pixmaps"
+  "/run/current-system/sw/share/pixmaps"
+)
+
+find_desktop_file() {
+  local id="$1"
+  for dir in "${APP_DIRS[@]}"; do
+    [ -d "$dir" ] || continue
+    local match
+    match=$(find "$dir" -maxdepth 1 -iname "${id}.desktop" 2>/dev/null | head -1)
+    [ -n "$match" ] && { echo "$match"; return; }
+  done
+  for dir in "${APP_DIRS[@]}"; do
+    [ -d "$dir" ] || continue
+    local match
+    match=$(grep -ilE "StartupWMClass=${id}$|^Name=${id}$" "$dir"/*.desktop 2>/dev/null | head -1)
+    [ -n "$match" ] && { echo "$match"; return; }
+  done
+}
+
+find_icon_path() {
+  local icon_name="$1"
+  [ -z "$icon_name" ] && return
+  if [[ "$icon_name" == /* ]]; then
+    echo "$icon_name"
+    return
+  fi
+  for dir in "${ICON_DIRS[@]}"; do
+    [ -d "$dir" ] || continue
+    local match
+    match=$(find "$dir" -type f \( -iname "${icon_name}.svg" -o -iname "${icon_name}.png" -o -iname "${icon_name}.xpm" \) 2>/dev/null | sort -r | head -1)
+    [ -n "$match" ] && { echo "$match"; return; }
+  done
+}
+
+resolve_icon() {
+  local app_id="$1"
+  local cached
+  cached=$(awk -F'\t' -v k="$app_id" '$1==k{print $2}' "$CACHE_FILE")
+  if [ -n "$cached" ]; then
+    echo "$cached"
+    return
+  fi
+
+  local desktop_file icon_name icon_path
+  desktop_file=$(find_desktop_file "$app_id")
+  if [ -n "$desktop_file" ]; then
+    icon_name=$(grep -m1 '^Icon=' "$desktop_file" | cut -d= -f2-)
+  fi
+  icon_path=$(find_icon_path "$icon_name")
+  [ -z "$icon_path" ] && icon_path="$HOME/.config/eww/icons/fallback.svg"
+
+  printf '%s\t%s\n' "$app_id" "$icon_path" >> "$CACHE_FILE"
+  echo "$icon_path"
+}
+
+ws=$(niri msg -j workspaces)
+active_id=$(echo "$ws" | jq '[.[] | select(.is_focused==true)][0].id')
+
+niri msg -j windows | jq -c --argjson wsid "$active_id" \
+  '[.[] | select(.workspace_id == $wsid) | {app_id: (.app_id // "unknown"), title: (.title // "")}]' \
+  | jq -c '.[]' \
+  | while read -r win; do
+      app_id=$(jq -r '.app_id' <<< "$win")
+      title=$(jq -r '.title' <<< "$win")
+      icon=$(resolve_icon "$app_id")
+      jq -nc --arg app_id "$app_id" --arg title "$title" --arg icon "$icon" \
+        '{app_id: $app_id, title: $title, icon: $icon}'
+    done | jq -sc '.'