#!/bin/sh

# Compile the C program into the BrainF*** interpreter.
echo 'Compiling the C program into the BrainF*** interpreter...'
gcc '-D_(a,b,_,d,e)=while(a(d(e(_?putchar(b):(c=getchar())<0?b:c))))' -Dunsigned= -funsigned-char -ansi -o ioccc5 -O2 ioccc5o1.c

# Generate the decompressor program.
echo 'Generating the decompressor program...'
rm bfunzip.b 2>/dev/null
cp ioccc5o1.c bfunzip.b

# Generate a Perl program that finds a hidden BrainF***
# program in ioccc5o1.c that reverses files
echo 'Generating the file-reverse precursor program...'
rm revfilup.pl 2>/dev/null
cp ioccc5o1.c revfilup.pl

# Generate a sed script to make it possible to pass
# programs as arguments to the BrainF*** interpreter
echo 'Creating the argument-passing sed script...'
rm ioccc5.sed 2>/dev/null
cat > ioccc5.sed <<EOF
1 i\\
#!/bin/sh\\
ioccc5 '
/'/ s/'//g
$ a\\
'
EOF

# Files are sometimes generated without required terminating
# newlines, so create a file that's just a newline
echo 'Creating a newline-only file...'
rm newline.txt 2>/dev/null
cat > newline.txt <<EOF

EOF

# Now generate runbf.sh, so we can run BrainF*** files easily.
# Note that this cannot be piped with itself, as it creates
# a temporary file.
echo 'Creating a shell-script wrapper to the interpreter...'
rm runbf.sh 2>/dev/null
cat > runbf.sh <<'EOF'
#!/bin/sh

# This program runs a BrainF*** program by filename. Assumes ioccc5.sed and newline.txt exist.

rm temp.sh 2>/dev/null
cat $1 newline.txt | sed -f ioccc5.sed > temp.sh
sh temp.sh # inherits input/output redirection
rm temp.sh
EOF

# Generate the file-reversing program (this program
# is subject to buffer overflow, but is padded so that
# the buffer is much larger than the original program so
# that it can be safely used on it)
echo 'Generating the file-reverse program...'
rm revfile.b 2>/dev/null
cat ioccc5o1.c newline.txt | perl -p revfilup.pl > revfile.b

# Generate the tab-remove program
echo 'Generating the tab-removal program...'
rm remtab.b 2>/dev/null
sh runbf.sh bfunzip.b < ioccc5o1.c > remtab.b

# Generate the triangular-cut program
echo 'Generating the triangular-cut program...'
rm tricut.pl 2>/dev/null
sh runbf.sh revfile.b < ioccc5o1.c > tricut.pl

# Generate the compressor program
echo 'Generating the compressor program...'
rm bfzip.b 2>/dev/null
cat ioccc5o1.c newline.txt | perl -p tricut.pl > bfzip.b

# Generate the cat program (warning: this program has
# a max file size. Keep input smaller than about 1k)
echo 'Generating the buffer-overflowing cat program...'
rm cat.b 2>/dev/null
uuencode ioccc5o1.c '[[' > cat.b

# Generate the letter-doubling program
echo 'Generating the letter-doubling program...'
rm doubcat.b 2>/dev/null
sh runbf.sh bfzip.b < ioccc5o1.c > doubcat.b