1 files changed, 55 insertions, 0 deletions
diff --git a/network/syncterm/extract-icns.sh b/network/syncterm/extract-icns.sh
new file mode 100644
index 0000000000..07c3f41873
--- /dev/null
+++ b/network/syncterm/extract-icns.sh
@@ -0,0 +1,55 @@
+#!/bin/sh
+
+# 20230728 bkw: Extract PNG icons from a mac .icns file, for use
+# with a SlackBuilds.org script.
+
+# They get written to a directory called icons/, with filenames like
+# 32.png, 64.png, etc (the pixel size). After extracting them, you
+# should 'git add icons/*' if you're using git (otherwise, include
+# icons/ in your submission tarball).
+
+# The SlackBuild should include code to install them; see
+# syncterm.SlackBuild for an example. Don't forget to include a
+# doinst.sh.
+
+# Licensed under the WTFPL. See http://www.wtfpl.net/txt/copying/ for details.
+# Feel free to use this as part of your own SlackBuild.
+
+# Note that this script shouldn't be included in the package!
+
+die() {
+  echo "$( basename $0 ): $@" 1>&2
+  exit 1
+}
+
+if [ "$1" = "" -o "$2" != "" ]; then
+  die "one argument required, path to *.icns file."
+fi
+
+if ! which icns2png &>/dev/null; then
+  die "icns2png not found in \$PATH. Install libicns."
+fi
+
+if [ -e icons ]; then
+  die "icons/ already exists, not overwriting."
+fi
+
+mkdir -p icons
+cd icons || die "can't create or cd to icons/ dir."
+
+icns2png -x -d 32 "$1" || die "can't extract any icons."
+count=0
+for png in *x32.png; do
+  [ -e $png ] || break
+  size="$( echo $png | cut -d_ -f2 | cut -dx -f1 )"
+  mv $png $size.png
+  : $(( count++ ))
+done
+
+if [ "$count" = "0" ]; then
+  rm -rf ../icons
+  die "failed to extract any icons."
+fi
+
+echo "extracted $count icons:"
+ls