Add 2018/bellard/try.sh

2018/bellard/README.md

@@ -17,18 +17,20 @@ code](#alternate-code) below.
 
 ## Try:
 
-```sh
-eog lena.ppm # On Linux
-open -a Preview lena.ppm # On macOS
+First open [Lenna.png](Lenna.png) in your graphics viewer of choice. Next, after
+running the above command (`./prog > lena.ppm`), open `lena.ppm` in your
+graphics viewer of choice.  After that try:
 
-pngtopam < Lenna.png | pnmscale 0.25 | cjpeg -arithmetic -dct float -quality 14 > small.jpg
+```sh
+./try.sh
 ```
 
-NOTE: `pngtopam(1)` (or `pngtopnm(1)` for older versions) and `pnmscale` come from
-the netpbm project and `cjpeg(1)` comes from `libjpeg-turbo`. If you don't have
-these tools already see [FAQ 3.15 - How do I compile and install netpbm for
-entries that require it?](/faq.md#netpbm) and [FAQ 3.16 - How do I compile and
-install libjpeg-turbo for entries that require it?](/faq.md#libjpeg).
+NOTE: the script uses the tools `pngtopam(1)` (or `pngtopnm(1)` for older
+versions) and `pnmscale` come from the netpbm project and `cjpeg(1)` comes from
+`libjpeg-turbo`. If you don't have these tools already see [FAQ 3.15 - How do I
+compile and install netpbm for entries that require it?](/faq.md#netpbm) and
+[FAQ 3.16 - How do I compile and install libjpeg-turbo for entries that require
+it?](/faq.md#libjpeg).
 
 NOTE: [Lenna.png](Lenna.png) is from
 <https://upload.wikimedia.org/wikipedia/en/7/7d/Lenna_%28test_image%29.png>.

2018/bellard/try.sh

@@ -0,0 +1,50 @@
+#!/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