Add 2018/bellard/try.sh

2018/bellard/try.sh

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+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2018/bellard
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+[[ -z "$CC" ]] && CC="cc"
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+# find out if we have necessary tools
+PNGTOPAM="$(type -P pngtopam)"
+PNMSCALE="$(type -P pnmscale)"
+PNGTOPNM="$(type -P pngtopnm)"
+CJPEG="$(type -P cjpeg)"
+
+rm -f small.jpg
+
+if [[ -n "$PNGTOPAM" && -n "$PNMSCALE" && -n "$CJPEG" ]]; then
+    echo "$ $PNGTOPAM < Lenna.png | $PNMSCALE 0.25 | $CJPEG -arithmetic -dct float -quality 14 > small.jpg" 1>&2
+    read -r -n 1 -p "Press any key to continue: "
+    echo 1>&2
+    "$PNGTOPAM" < Lenna.png | "$PNMSCALE" 0.25 | "$CJPEG" -arithmetic -dct float -quality 14 > small.jpg
+    if [[ -f small.jpg ]]; then
+	echo "Now open small.jpg in your graphics viewer of choice." 1>&2
+    fi
+elif [[ -n "$PNGTOPNM" && -n "$PNMSCALE" && -n "$CJPEG" ]]; then
+    echo "$ $PNGTOPNM < Lenna.png | $PNMSCALE 0.25 | $CJPEG -arithmetic -dct float -quality 14 > small.jpg" 1>&2
+    read -r -n 1 -p "Press any key to continue: "
+    echo 1>&2
+    "$PNGTOPNM" < Lenna.png | "$PNMSCALE" 0.25 | "$CJPEG" -arithmetic -dct float -quality 14 > small.jpg
+    if [[ -f small.jpg ]]; then
+	echo "Now open small.jpg in your graphics viewer of choice." 1>&2
+    fi
+else
+    if [[ -z "$PNGTOPAM" || -z "$PNGTOPNM" || "$PNMSCALE" ]]; then
+	echo "Cannot find pngtopam(1) or pnmscale(1). Try installing netpbm first." 1>&2
+	echo "See https://github.com/ioccc-src/temp-test-ioccc/blob/master/faq.md#netpbm" 1>&2
+	echo 1>&2
+    fi
+    if [[ -z "$CJPEG" ]]; then
+	echo "Cannot find cjpeg. Try installing libjpeg-turbo." 1>&2
+	echo "See https://github.com/ioccc-src/temp-test-ioccc/blob/master/faq.md#libjpeg." 1>&2
+	echo 1>&2
+fi