Add script to set wallpaper

fehbg.nu

@@ -0,0 +1,61 @@
+#!/usr/bin/env nu
+#
+# ~/.fehbg.nu
+#
+# This script selects a random image from a directory and sets it as a
+# wallpaper. An additional feature is that it draws the path of the image in
+# the lower left corner which makes it easier to find the image later.
+#
+# The procedure is as follows::
+# * Select a random image from a directory (recursively entering all
+#   subdirectories)
+# * Print the path of the image as an overlay on top of the selected image
+# * Save the result in a temporary file
+# * Set the temporary image as a wallpaper.
+#
+# !! Requires `WALLPAPER_DIR` and `TMP_DIR` environment variables to be set !!
+#    (or just hardcode your own paths below)
+#
+# Dependencies;
+# * nu version  >0.25.1 (0.25.1. doesn't work due to coercion error bug)
+# * feh
+# * imagemagick
+
+# Path definitions
+let img_dir = $nu.env.WALLPAPER_DIR
+let tmp_image = $(build-string $nu.env.TMP_DIR "/wallpaper.jpg")
+
+# Monitor resolution
+let resolution_y = 1440
+
+# Position of the caption
+let pos_x = 5
+let pos_y = 0.995 * $resolution_y
+
+# Helper commands
+def select_random [] { shuffle | first }
+
+# List all images in a directory and all its subdirectories
+def list_images [dir] {
+    ls $(build-string $dir /**/*) | where type == File | where name =~ jpg || name =~ jpeg || name =~ tif || name =~ tiff
+}
+
+# Set the caption text (just filename for now)
+def caption [img_f] {
+    echo $img_f
+}
+
+# Build the argument for the '-draw' command of the 'convert' utility
+def draw_str [img_f] {
+    build-string 'text ' $pos_x ',' $pos_y ' "' $(caption $img_f) '" '
+}
+
+# Select random image
+let img_name = $(list_images $img_dir | select_random | get name)
+
+# Resize the image to the monitor height, draw the caption and save it
+let res_str = $(build-string 'x' $resolution_y)
+convert -resize $res_str -pointsize 15 -fill "rgb(255,200,150)" -draw $(draw_str $img_name) $img_name $tmp_image
+
+# Set the created image as a background
+feh --no-fehbg --bg-max $tmp_image