1 files changed, 29 insertions, 0 deletions
diff --git a/bin/system-theme b/bin/system-theme
new file mode 100755
index 0000000..862b243
--- /dev/null
+++ b/bin/system-theme
@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+# Switch the COSMIC desktop between light and dark mode, and optionally the
+# wallpaper with it: set SYSTEM_THEME_WALLPAPER_DARK and
+# SYSTEM_THEME_WALLPAPER_LIGHT to image files. Emacs's auto-dark follows the
+# desktop's mode on its own. On another desktop, this is the file to rewrite.
+
+COSMIC="${XDG_CONFIG_HOME:-$HOME/.config}/cosmic"
+
+set_wallpaper() {
+    [ -n "$1" ] || return 0
+    wallpaper="$(realpath "$1")" || return 1
+    sed -i 's|^.*source: Path(".*"),$|    source: Path("'"$wallpaper"'"),|' \
+        "$COSMIC/com.system76.CosmicBackground/v1/all"
+}
+
+case "$1" in
+  dark)
+    echo "true" > "$COSMIC/com.system76.CosmicTheme.Mode/v1/is_dark"
+    set_wallpaper "${SYSTEM_THEME_WALLPAPER_DARK:-}"
+    ;;
+  light)
+    echo "false" > "$COSMIC/com.system76.CosmicTheme.Mode/v1/is_dark"
+    set_wallpaper "${SYSTEM_THEME_WALLPAPER_LIGHT:-}"
+    ;;
+  *)
+    echo "usage: system-theme dark|light" >&2
+    exit 1
+    ;;
+esac