Contrib: script for changing wallpapers on change

Simple script which allows you to save nitrogen's wallpaper setup
for current profile and restore it when profile is loaded.

Useful in case you are moving between different monitor setups and
orientations.

diff --git a/contrib/autorandr_nitrogen_wallpaper/autorandr_nitrogen_wallpaper b/contrib/autorandr_nitrogen_wallpaper/autorandr_nitrogen_wallpaper
new file mode 100755 (executable)
index 0000000..d06f6b0
--- /dev/null
+++ b/contrib/autorandr_nitrogen_wallpaper/autorandr_nitrogen_wallpaper
@@ -0,0 +1,83 @@
+#!/bin/bash
+
+# autorandr_nitrogen_wallpaper
+# Copyright (c) 2015, Ondra 'Kepi' Kudlík, http://kepi.cz
+#
+# Simple script to switch wallpapers when autorandr change profile
+#
+# Usage
+# =====
+#
+# 1. place this script (or better symlink it from autorandr location)
+#    to ~/.config/autorandr/postswitch
+# 2. run "nitrogen" and set wallpapers for current profile as you wish
+# 3. run ~/.config/autorandr/postswitch savebg
+# 4. repeat steps 2-3 for any profile you wish
+#
+# License
+# =======
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+# 
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+NITROGEN_HOME="$HOME/.config/nitrogen"
+NITROGEN_BG="$NITROGEN_HOME/bg-saved.cfg"
+
+# try to detect profile
+PROFILE=$(autorandr 2>&1| grep detected |awk '{ print $1 }')
+[[ -n "$PROFILE" ]] || exit 1
+
+PROFILE_BG_FILE="bg-saved.$PROFILE.cfg"
+PROFILE_BG="$NITROGEN_HOME/$PROFILE_BG_FILE"
+
+# save background for detected profile
+if [[ $1 = 'savebg' ]]; then
+    # nitrogen config doesnt exist, instruct to run it first
+    if [[ ! -f "$NITROGEN_BG" ]]; then
+        echo "wallpaper: you need to first run 'nitrogen' and set your wallpapers"
+        exit 2
+    fi
+    # nitrogen config exists but is broken symlink, just remove it and instruct to run it first
+    if [ ! -e "$NITROGEN_BG" ] ; then
+        /usr/bin/unlink "$NITROGEN_BG"
+        echo "wallpaper: you need to first run 'nitrogen' and set your wallpapers (config was broken)"
+        exit 3
+    fi
+
+    /bin/cp -L "$NITROGEN_BG" "$PROFILE_BG"
+
+# load background for detected profile
+else
+    # we have some profile background config for this setup
+    if [[ -f "$PROFILE_BG" ]]; then
+        # nitrogen original file exists and not symlink
+        if [[ -f "$NITROGEN_BG" ]] && [[ ! -L "$NITROGEN_BG" ]]; then
+            echo "wallpaper: Backing up nitrogen saved bg to $NITROGEN_BG.backup" 
+            /bin/mv "$NITROGEN_BG" "$NITROGEN_BG".backup
+        fi
+        
+        # set symlink
+        echo "wallpaper: Found saved wallpaper for profile $PROFILE - changing"
+        ln -f -s "$PROFILE_BG_FILE" "$NITROGEN_BG"
+        # call nitrogen
+        nitrogen --restore
+    else
+        echo "wallpaper: No saved wallpaper found for profile $PROFILE"
+    fi
+fi