Add 1987/heckbert/try.sh

The script runs a variety of commands to show how it can fold files
(mostly itself) into different column lengths but it also shows how that
folded code can recreate the original (uses diff -s).

It also asks a question that was in the try section as well.

1987/heckbert/README.md

@@ -20,15 +20,7 @@ where col is the number of columns to fold at and file is the file to fold.
 ### Try:
 
 ```sh
-./heckbert 40 < heckbert.c > ph.c; make ph
+./try.sh
-./ph 21 < heckbert.c > bar.c; make bar
-
-```
-
-Ask yourself what happens to `foo.md` if you try:
-
-```sh
-./ph 40 < README.md > foo.md
 ```
 
 

1987/heckbert/try.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 1987/heckbert
+#
+
+# make sure CC is set so that when we do make CC="$CC" it isn't empty. Doing it
+# this way allows us to have the user specify a different compiler in an easy
+# way.
+if [[ -z "$CC" ]]; then
+    CC="cc"
+fi
+
+make CC="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+read -r -n 1 -p "Press any key to show heckbert.c (space = next page, q = quit): "
+echo 1>&2
+less -rEXF heckbert.c
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./heckbert 40 < heckbert.c: "
+echo 1>&2
+./heckbert 40 < heckbert.c
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./heckbert 40 < heckbert.c > ph.c; make ph: "
+./heckbert 40 < heckbert.c > ph.c; make ph
+echo 1>&2
+
+read -r -n 1 -p "Press any key to show ph.c (space = next page, q = quit): "
+echo 1>&2
+less -rEXF ph.c
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./ph 21 < heckbert.c > bar.c; make bar: "
+echo 1>&2
+./ph 21 < heckbert.c > bar.c; make bar
+echo 1>&2
+
+read -r -n 1 -p "Press any key to show bar.c (space = next page, q = quit): "
+echo 1>&2
+less -rEXF bar.c
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: ./bar 79 < bar.c > foo.c: "
+echo 1>&2
+./bar 79 < bar.c > foo.c
+echo 1>&2
+
+read -r -n 1 -p "Press any key to show difference between foo.c and heckbert.c: "
+echo 1>&2
+diff -s heckbert.c foo.c
+
+read -r -n 1 -p "Press any key to run: ./ph 40 < README.md > foo.md: "
+./ph 40 < README.md > foo.md
+echo 1>&2
+echo "Now what happened to foo.md?"

thanks-for-help.md

@@ -510,6 +510,9 @@ There might have been other changes as well.
 [Cody](#cody) made this look more like the original entry by restoring the `#define` of
 `define`. It's not used but it now looks closer to the original.
 
+Cody also added the [try.sh](1987/heckbert/try.sh) script which shows how the
+program works but also how the folded code can recreate the original.
+
 Also because `index(3)` is deprecated and in some systems requires the inclusion
 of `strings.h` and because it's identical in use to `strchr(3)` (and we noted
 that for System V we had to do this) Cody added to the Makefile