Merge pull request #1626 from xexyl/wiedijk2014-try

2014/wiedijk/README.md

@@ -15,9 +15,20 @@ make
 ### Try:
 
 ```sh
-cc -E prog.c | indent | sed '1,/5.*prog/d'
+./try.sh
 ```
 
+By default that will use `indent(1)` found by the shell `type -P indent` and
+`sed(1)` found by the shell `type -P sed` but if you want to change these, say
+to try a different beautifier, you can do it like:
+
+```sh
+INDENT=bcpp ./try.sh
+```
+
+which would change it to use `bcpp(1)` instead of `indent(1)`. Do similar for
+`sed(1)` only use the name `SED`.
+
 
 ## Judges' remarks:
 
@@ -32,31 +43,32 @@ If you win a bet by demonstrating this entry, please let us know.
 
 ### Remarks
 
-- computes the factorial function
-- no loops, no explicit recursion
-- untyped C without any casts, using a `w` word datatype
-- varargs not essential, `w(*)(w,w*)` works just as well
-- conforming ISO C
-- no warnings when compiled with `-std=c99 -Wall -Wextra -pedantic`
-- comments in the code explain what this really is about
-- C as a functional programming language:
-  untyped lambda calculus compiled to executable C functions
-- untagged closures (just a function pointer followed by some values)
-- recursion implemented through Curry's paradoxical combinator `Y`
-- the readable implementation of `Y` is on lines 29-30:
+- Computes the factorial function.
+- No loops, no explicit recursion.
+- Untyped C without any casts, using a `w` word datatype.
+- Varargs not essential, `w(*)(w,w*)` works just as well.
+- Conforming to ISO C.
+- No warnings when compiled with `-std=c99 -Wall -Wextra -pedantic`.
+- Comments in the code explain what this really is about.
+- C as a functional programming language: untyped lambda calculus compiled to
+executable C functions.
+- Untagged closures (just a function pointer followed by some values).
+- Recursion implemented through Curry's paradoxical combinator `Y`.
+- The readable implementation of `Y` is on lines 29-30:
 
 ```
 W_f = \x.f(xx)
 Y = \f.W_f W_f
 ```
 
-- a mixture of strict and lazy evaluation, with a `_` force function
+- A mixture of strict and lazy evaluation, with a `_` force function
   (John Tromp notes that if Turing's fixed-point combinator
   `(\xy.y\z.xxyz)(\xy.y\z.xxyz)` had been used,
-  all applications could have been strict)
-- uses `Y` to implement factorial on native `int`s
-- 10! seconds = 6 weeks
-- answers the ultimate question of life, the universe and everything
+  all applications could have been strict).
+- Uses `Y` to implement factorial on native `int`s.
+- 10! seconds = 6 weeks.
+- Answers the [ultimate question of life, the universe and
+everything](https://hitchhikers.fandom.com/wiki/42).
 
 
 ## Copyright and CC BY-SA 4.0 License:

2014/wiedijk/try.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+#
+# try.sh - demonstrate IOCCC winner 2014/wiedijk
+#
+
+# 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="$CC" all >/dev/null || exit 1
+
+# clear screen after compilation so that only the entry is shown
+clear
+
+
+# Make sure that indent(1) and sed(1) are installed but let user override them
+# as well say for using a different beautifier. We assume less(1) is installed.
+
+if [[ -z "$INDENT" ]]; then
+    INDENT="$(type -P indent)"
+else
+    INDENT="$(type -P "$INDENT")"
+fi
+if [[ ! -x "$INDENT" ]]; then
+    echo "$0: cannot find indent, sorry." 1>&2
+    exit 1
+fi
+
+if [[ -z "$SED" ]]; then
+    SED="$(type -P sed)"
+else
+    SED="$(type -P "$SED")"
+fi
+if [[ ! -x "$SED" ]]; then
+    echo "$0: cannot find sed, sorry." 1>&2
+    exit 2
+fi
+
+echo "$ cc -E prog.c | "$INDENT" |
+    "$SED" '1,/5.*prog/d' | less -EXF"
+read -r -n 1 -p "Press any key to continue (space = next page, q = quit): "
+echo 1>&2
+cc -E prog.c | "$INDENT" | "$SED" '1,/5.*prog/d' | less -EXF

thanks-for-fixes.md

@@ -3721,6 +3721,16 @@ theoretically work for Microsoft Windows compilers (if anything works in Windows
 that would break it we do not know.
 
 
+## [2014/wiedijk](2014/wiedijk/prog.c) ([README.md](2014/wiedijk/README.md))
+
+[Cody](#cody) added the [try.sh](2014/wiedijk/try.sh) script which is based on
+the command to try in the 'try' section but improved so one can more easily
+specify what ident tool they want to use and also change which sed to use,
+should they want to. It also checks that both of these two tools exist and are
+executable and it pipes it through less as it's longer than a page worth of
+output.
+
+
 # <a name="2015"></a>2015