Add bin/imgoptim

bin/imgoptim

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+# A simple script that losslessly optimizes image files given to it.
+#
+# Examples:
+#   imgoptim image.jpg image.png image.gif
+#   imgoptim directory_of_images/
+#   imgoptim directory_of_images/*.png
+#
+# Requires:
+#   PNGs: optipng, pngquant (lossy)
+#   JPGs: jpegtran, jpegoptim (lossy)
+#   GIFs: gifsicle
+
+set -e
+
+LOSSY=
+
+usage() {
+    cat <<EOL
+Usage: ${0##*/} [-lh] IMAGE [IMAGE2 [IMAGE3 [...]]]
+
+    -l    enable lossy compression
+    -h    this help
+EOL
+}
+
+while getopts hl opt; do
+    case $opt in
+        h) usage; exit;;
+        l) LOSSY=1;;
+        :) >&2 echo "$OPTARG requires an argument"; usage; exit 1;;
+        *) >&2 echo "Not a valid arg: $opt"; usage; exit 1;;
+    esac
+done
+shift $((OPTIND-1))
+
+_filesize() {
+    case $OSTYPE in
+        darwin*) stat -c%s "$1" ;;
+        *) stat --printf="%s" "$1" ;;
+    esac
+}
+
+for file in $@; do
+    if [[ -d $file ]]; then
+        imgoptim $file/*
+    elif [[ -f $file ]]; then
+        pre_size=$(_filesize "$file")
+        case ${file##*.} in
+            png)
+                [[ $LOSSY ]] && pngquant $file
+                optipng -nc -nb -o7 $file
+                ;;
+            gif)
+                gifsicle --batch --optimize=3 "$file"
+                ;;
+            jpg|jpeg)
+                [[ $LOSSY ]] && jpegoptim --max=90 "$file"
+                jpegtran -copy none -optimize -progressive -outfile "$file" "$file"
+                ;;
+            *)  printf "Unrecognized file '$file': ignored"
+                ;;
+        esac
+        post_size=$(_filesize "$file")
+        perc=$(echo "((${pre_size} - ${post_size}) / ${pre_size}) * 100" | bc -l)
+        printf "* %s: %d => %d (%.2f%% reduction)\n" "$file" "${pre_size}" "${post_size}" "$perc"
+    fi
+done