Add icns-millefeuille.sh

The Agua system icons I'm using don't include all of the variants
required on Mac OS X 10.12 Sierra. The originals have seven sizes (32,
256, 512, and 1024), while the system icons have 10 (16, 32, 64, 128,
256, 512, 1024).

Using the seven-size icns didn't work when the file was copied into
`CoreTypes.bundle`. When I added additional icns size variants, the
replacement did work.

This script abstracts the manual work I did to add the appropriate
variants to the Agua icons. Other icon sets may not convert in the same
way.

1 files changed, 37 insertions, 0 deletions

diff --git a/icns-millefeuille.sh b/icns-millefeuille.sh
new file mode 100755
index 0000000..e3319a1
--- /dev/null
+++ b/icns-millefeuille.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+# icns-millefeuille.sh
+#
+# Takes an icns file and adds missing @1x and 32px sizes. Creates a new icns
+# file based on the input in the current directory.
+
+EX_USAGE=64
+
+if [ $# -ne 1 ]; then
+	echo >&2 'usage: icns-millefeuille.sh ICNS_FILE'
+	exit $EX_USAGE
+fi
+
+original_icon="$1"
+icon="$(basename "$original_icon")"
+iconset="${icon/.icns/.iconset}"
+
+cp -a "$original_icon" .
+
+iconutil -c iconset "$icon"
+
+cd "$iconset"
+
+cp icon_16x16\@2x.png icon_32x32.png
+
+sips -Z 512 icon_512x512\@2x.png --out icon_512x512.png
+sips -Z 256 icon_256x256\@2x.png --out icon_256x256.png
+sips -Z 128 icon_128x128\@2x.png --out icon_128x128.png
+sips -Z 64 icon_128x128.png --out icon_32x32\@2x.png
+sips -Z 16 icon_16x16\@2x.png --out icon_16x16.png
+
+cd ..
+
+iconutil -c icns "$iconset"
+
+rm -rf "$iconset"