sh: Add timg aliases

Added shell aliases for 'image listings' which aims to mimic the `ls`
command in a very simple way.

Invoke it via `il` to display a grid of all images residing in current
directory. Images are being detected not by their extension but by
running a `file` operation on, so in very large directories this might
take a little (though, your terminal will probably buckle under the
weight of displaying thousands of images anyway, so use with care).

`IL` provides the same functionality but recurses into an arbitrary
amount of subdirectories. Very useful to get an overview of a certain
directory and its children but, again, think for a second before using
since this could easily spew thousands of pictures into your term.

sh/.config/sh/alias.d/timg.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env sh
+# Add simple 'image ls' for a directory using timg
+#
+# Prints a thumbnail gallery right in the terminal.
+# WILL stutter when you go crazy in a hundred/thousand
+# picture folder.
+
+if exist timg; then
+    il() {
+        images=$(find . -maxdepth 1 -type f -exec file --mime-type {} \+ | awk -F: '{if ($2 ~/image\//) print $1}')
+        if [ -z "$images" ]; then {
+            echo no images found.
+            return
+        }; fi
+        echo "$images" | timg --grid=4x3 --upscale=i --center --title --frames=1 -f -
+    }
+    IL() {
+        images=$(find . -type f -exec file --mime-type {} \+ | awk -F: '{if ($2 ~/image\//) print $1}')
+        if [ -z "$images" ]; then {
+            echo no images found.
+            return
+        }; fi
+        echo "$images" | timg --grid=4x3 --upscale=i --center --title --frames=1 -f -
+    }
+    qr() {
+        # if we are in a pipe, read from stdin and set fct arguments to it
+        if [ ! -t 0 ]; then
+            set -- "$(cat /dev/stdin)"
+        fi
+        qrencode -s1 -m2 "$@" -o- | timg --upscale=i -
+    }
+fi