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###### huginn - język programowania bez psikusów, tak prosty że każde dziecko może go opanować.
`git clone https://codestation.org/repo/huginn.git`
`git clone https://github.com/AmokHuginnsson/huginn.git`
`git clone https://bitbucket.org/huginn/huginn.git`

Sample of real life application of Huginn language.
Some of those samples are inspired by Rosetta Code project,
other are inspired by list of popular problems found on esolang page.

Solution for 100 doors problem.

Editor (vim) - 100doors.hgn (Try it online!)
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```#! /bin/sh
exec huginn --no-argv -E "\${0}"
#! huginn

import Algorithms as algo;

main() {
doorCount = 100;
doors = [].resize( doorCount, false );

for ( pass : algo.range( doorCount ) ) {
i = 0;
step = pass + 1;
while ( i < doorCount ) {
doors[i] = ! doors[i];
i += step;
}
}

for ( i : algo.range( doorCount ) ) {
if ( doors[i] ) {
print( "door {} is open\n".format( i ) );
}
}
return ( 0 );
}

```

Implementaion of a 24 game.

Editor (vim) - 24game.hgn
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
```#! /bin/sh
exec huginn --no-argv -E "\${0}"
#! huginn

import Algorithms as algo;
import Mathematics as math;
import RegularExpressions as re;

make_game( rndGen_ ) {
board = "";
for ( i : algo.range( 4 ) ) {
board += ( " " + string( character( rndGen_.next() + integer( '1' ) ) ) );
}
return ( board.strip() );
}

main() {
rndGen = math.Randomizer( 9 );
no = 0;
dd = re.compile( "\\d\\d" );
while ( true ) {
no += 1;
board = make_game( rndGen );
line = repl( "Your four digits: {}\nExpression {}: ".format( board, no ) );
if ( line == none ) {
print( "\n" );
break;
}
line = line.strip();
try {
if ( line == "q" ) {
break;
}
if ( ( pos = line.find_other_than( "{}+-*/() ".format( board ) ) ) >= 0 ) {
print( "Invalid input found at: {}, `{}`\n".format( pos, line ) );
continue;
}
if ( dd.match( line ).matched() ) {
print( "Digit concatenation is forbidden.\n" );
continue;
}
res = real( line );
if ( res == 24.0 ) {
print( "Thats right!\n" );
} else {
}
} catch ( Exception e ) {
print( "Not an expression: {}\n".format( e.what() ) );
}
}
return ( 0 );
}

```

Print the text of the "99 bottles of beer" song.

Editor (vim) - 99bottles.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
```#! /bin/sh
exec huginn --no-argv -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;

main() {
x = "{} bottle{} of beer on the wall,\n"
"{} bottle{} of beer.\n"
"Take one down, pass it around,\n"
"{} bottle{} of beer on the wall.\n\n";
for ( n : algo.range( 99, 0, -1 ) ) {
bot = n > 0 ? n : "No";
plu = n != 1 ? "s" : "";
print( x.format( bot, plu, bot, plu, n > 1 ? n - 1 : "No", n != 2 ? "s" : "" ) );
}
print(
"No bottles of beer on the wall,\n"
"No bottles of beer.\n"
"Go to the store, buy some more,\n"
"99 bottles of beer on the wall.\n"
);
return ( 0 );
}
```

Following sample is implementation of a trie based solver for popular board game named Boggle.

Editor (vim) - solve.hgn
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140
```#! /bin/sh
exec huginn --rapid-start -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;
import Mathematics as math;
import FileSystem as fs;

class DictionaryNode {
_finished = false;
_next = lookup();

if ( size( suffix_ ) == 0 ) {
_finished = true;
} else {
char = suffix_[0];
if ( char ∉ _next ) {
_next[char] = DictionaryNode();
}
}
}

get( char_ ) {
return ( _next.get( char_, none ) );
}

print_all( prefix_ = "" ) {
if ( _finished ) {
print( prefix_ + "\n" );
}
for ( char : _next ) {
_next[char].print_all( prefix_ + string( char ) );
}
}
}

class Cube {
_letter = none;
_visited = false;
_neighbors = [];
constructor( letter_ ) {
_letter = letter_;
}
}

class Board {
_cubes = none;
_size = 0;
constructor( letters_ ) {
len = integer( math.square_root( real( size( letters_ ) ) ) );
if ( len * len != size( letters_ ) ) {
throw Exception( "Bad board definition!" );
}
_size = len;
_cubes = [];
for ( l : letters_ ) {
_cubes.push( Cube( l ) );
}
deltas = [
( -1, -1 ), ( -1, 0 ), ( -1, 1 ), ( 0, -1 ),
( 0, 1 ), ( 1, -1 ), ( 1, 0 ), ( 1, 1 )
];
for ( x : algo.range( len ) ) {
for ( y : algo.range( len ) ) {
for ( d : deltas ) {
nx = x + d[0];
ny = y + d[1];
if ( ( nx >= 0 ) && ( nx < len ) && ( ny >= 0 ) && ( ny < len ) ) {
get_cube( x, y )._neighbors.push( observe( get_cube( nx, ny ) ) );
}
}
}
}
}

get_cube( x_, y_ ) {
return ( _cubes[y_ * _size + x_] );
}

solve( dictionary_ ) {
result = set();
for ( cube : _cubes ) {
solve_recursive( result, "", cube, dictionary_ );
}
return ( algo.sorted( result, size ) );
}

solve_recursive( result, prefix_, cube_, dictNode_ ) {
nextNode = dictNode_.get( cube_._letter );
if ( nextNode == none ) {
return;
}
cube_._visited = true;
newPrefix = prefix_ + string( cube_._letter );
if ( nextNode._finished && ( size( newPrefix ) >= 3 ) ) {
result.insert( newPrefix );
}
for ( n : cube_._neighbors ) {
neighbor = use( n );
if ( ! neighbor._visited ) {
solve_recursive( result, newPrefix, neighbor, nextNode );
}
}
cube_._visited = false;
}
}

main( argv_ ) {
dictionaryRoot = DictionaryNode();
dictFile = fs.open( argv_[1], fs.OPEN_MODE.READ );
for ( line : dictFile ) {
}
//	dictionaryRoot.print_all();
print( "[ OK ] Ready\n" );
letters = "";
while ( ( line = input() ) != none ) {
line = line.strip();
if ( ( size( letters ) > 0 ) && ( size( line ) == 0 ) ) {
print( "[ OK ] Solving\n" );
try {
board = Board( letters );
for ( word : board.solve( dictionaryRoot ) ) {
print( "(" + string( size( word ) ) + ") " + word + "\n" );
}
print( "[ OK ] Solved\n" );
} catch ( Exception e ) {
print( e.message() + "\n" );
}
letters = "";
} else {
letters += line;
}
}
return ( 0 );
}

/* vim: set ft=huginn: */
```

Implementaion of a console Calendar.

Editor (vim) - calendar.hgn (Try it online!)
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```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import DateTime as dt;
import Algorithms as algo;
import Text as text;

class Calendar {
_monthNames_ = none;
_dayNames_ = none;
constructor() {
t = dt.now();
_monthNames_ = algo.materialize(
algo.map(
algo.range( 1, 13 ),
@[t]( m ) { dt.format( "%B", t.set_date( 1, m, 1 ) ); }
),
tuple
);
_dayNames_ = algo.materialize(
algo.map(
algo.range( 1, 8 ),
@[t]( d ) { dt.format( "%a", t.set_date( 1, 1, d ) )[:2]; }
),
tuple
);
}
print_year( year_, cols_ ) {
t = dt.now();
print( "{:^66d}\n".format( year_ ) );
for ( rm : algo.range( 12 / cols_ ) ) {
m = rm * cols_;
print( text.repeat( "{:^22s}", cols_ ).format( _monthNames_[m:m + cols_]... ) + "\n" );
day = [];
daysInMonth = [];
for ( mc : algo.range( cols_ ) ) {
print( " {} {} {} {} {} {} {} ".format( _dayNames_... ) );
t.set_date( year_, m + mc + 1, 1 );
day.push( - t.get_day_of_week() + 1 );
daysInMonth.push( t.get_days_in_month() );
}
print( "\n" );
haveDay = true;
while ( haveDay ) {
haveDay = false;
for ( mc : algo.range( cols_ ) ) {
for ( d : algo.range( 7 ) ) {
if ( ( day[mc] > 0 ) && ( day[mc] <= daysInMonth[mc] ) ) {
print( " {:2d}".format( day[mc] ) );
haveDay = true;
} else {
print( "   " );
}
day[mc] += 1;
}
print( " " );
}
print( "\n" );
}
}
}
}

main( argv_ ) {
cal = Calendar();
cols = size( argv_ ) > 2 ? integer( argv_[2] ) : 3;
if ( 12 % cols != 0 ) {
cols = 3;
}
cal.print_year(
size( argv_ ) > 1
? integer( argv_[1] )
: dt.now().get_year(),
cols
);
}

// # vim: set ft=huginn
```

Convert degrees to Compass points.

Editor (vim) - compass-rose.hgn (Try it online!)
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```#! /bin/sh
exec huginn --no-argv -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;
import Text as text;

class Compass {
_majors = none;
_quarter1 = none;
_quarter2 = none;
constructor() {
_majors = algo.materialize( text.split( "north east south west", " " ), tuple );
_majors += _majors;
_quarter1 = text.split( "N,N by E,N-NE,NE by N,NE,NE by E,E-NE,E by N", "," );
_quarter2 = algo.materialize(
algo.map( _quarter1, @( s ){ copy( s ).replace( "NE", "EN" ); } ),
list
);
}
degrees_to_compass_point( d ) {
d = d % 360. + 360. / 64.;
majorindex, minor = ( integer( d ) / 90, d % 90. );
minorindex  = integer( minor * 4. ) / 45;
p1, p2 = _majors[majorindex: majorindex+2];
q = none;
if ( p1 ∈ { "north", "south" } ) {
q = _quarter1;
} else {
q = _quarter2;
}
return ( text.capitalize( q[minorindex].replace( "N", p1 ).replace( "E", p2 ) ) );
}
}

main() {
print(
" # |  Angle  | Compass point\n"
"---+---------|-------------------\n"
);
c = Compass();
for ( i : algo.range( 33 ) ) {
d = real( i ) * 11.25;
m = i % 3;
if ( m == 1 ) {
d += 5.62;
} else if ( m == 2 ) {
d -= 5.62;
}
n = i % 32 + 1;
print( "{:2d} | {:6.2f}° | {}\n".format( n, d, c.degrees_to_compass_point( d ) ) );
}
}

```

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
```#! /bin/sh
exec huginn --no-argv -E "\${0}" "\${@}"
#! huginn

main() {
accumulator = 0;
print( ">> " );
while ( ( line = input() ) != none ) {
for ( c : line.strip() ) {
if ( ( accumulator == -1 ) || ( accumulator == 256 ) ) {
/* now, that's just a crazy talk */
accumulator = 0;
}
switch ( c ) {
case ( 'i' ): {
accumulator += 1;
} break;
case ( 'd' ): {
accumulator -= 1;
} break;
case ( 's' ): {
accumulator *= accumulator;
} break;
case ( 'o' ): {
print( "{}\n".format( accumulator ) );
} break;
default: {
print( "Unrecognized command.\n" );
}
}
}
print( ">> " );
}
print( "\n" );
return ( accumulator );
}

```

Calculate a Digital root of a number.

Editor (vim) - digital-root.hgn (Try it online!)
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```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

main( argv_ ) {
if ( size( argv_ ) < 2 ) {
throw Exception( "usage: digital-root {NUM}" );
}
n = argv_[1];
if ( ( size( n ) == 0 ) || ( n.find_other_than( "0123456789" ) >= 0 ) ) {
throw Exception( "{} is not a number".format( n ) );
}
shift = integer( '0' ) + 1;
acc = 0;
for ( d : n ) {
acc = 1 + ( acc + integer( d ) - shift ) % 9;
}
print( "{}\n".format( acc ) );
return ( 0 );
}

```

Calculate n! for an arbitrary n, or output the sequence (1!, 2!, 3!,...), where n! = 1*2*...*n.

Editor (vim) - factorials.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;

main( argv_ ) {
if ( size( argv_ ) < 2 ) {
print(
"Not enough arguments,"
" you have to specify a number\n"
);
return ( 1 );
}
n = integer( argv_[1] );
if ( n < 0 ) {
print( "you must specify non-negative number\n" );
return ( 2 );
}
for ( n : algo.range( 0, n + 1 ) ) {
print( "{}! = {}\n".format( n, number( n )! ) );
}
return ( 0 );
}

```

Output the Fibonacci numbers (1, 1, 2, 3, 5, 8, 13...) using either recursion or iteration.

Editor (vim) - fibonacci.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;

fib( n_ ) {
a = number( 0 );
b = number( 1 );
for ( _ : algo.range( algo.max( n_ - 1, 0 ) ) ) {
a, b = ( b, a + b );
}
if ( n_ == 0 ) {
b = 0;
}
return ( b );
}

main( argv_ ) {
if ( size( argv_ ) < 2 ) {
print(
"Not enough arguments,"
" you have to specify a number\n"
);
return ( 1 );
}
n = integer( argv_[1] );
if ( n < 0 ) {
print( "you must specify non-negative number\n" );
return ( 2 );
}
for ( n : algo.range( 0, n + 1 ) ) {
print( "fib({}) = {}\n".format( n, fib( n ) ) );
}
return ( 0 );
}

```

Solution for Fizz Buzz problem.

Editor (vim) - fizzbuzz.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;

main( argv_ ) {
if ( size( argv_ ) < 2 ) {
throw Exception( "usage: fizzbuzz {NUM}" );
}
top = integer( argv_[1] );
for ( i : algo.range( 1, top + 1 ) ) {
by3 = ( i % 3 ) == 0;
by5 = ( i % 5 ) == 0;
if ( by3 ) {
print( "fizz" );
}
if ( by5 ) {
print( "buzz" );
}
if ( ! ( by3 || by5 ) ) {
print( i );
}
print( "\n" );
}
return ( 0 );
}

```

Print "Hello, world!".

Editor (vim) - helloworld.hgn (Try it online!)
1 2 3 4 5 6 7 8
```#! /bin/sh
exec huginn --no-argv -E "\${0}" "\${@}"
#! huginn

main() {
print( "Hello World!\n" );
return ( 0 );
}
```

Print word histogram of stream read from standard input.

Editor (vim) - word-histogram.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
```#! /bin/sh
exec huginn -E --no-argv "\${0}" "\${@}"
#! huginn

import Algorithms as algo;
import Text as text;

main() {
hist = {};
while ( ( line = input() ) != none ) {
for ( w : text.split( line.strip().to_lower(), " " ) ) {
v = hist.ensure( w, 0 );
v += 1;
}
}
hist = algo.sorted( hist.values(), @(_){ -_[1]; } );
for ( h : hist ) {
print( "{:6d} {}\n".format( h[1], h[0] ) );
}
return ( 0 );
}

```

Print a Mandelbrot set on the console.

Editor (vim) - mandelbrot-set.hgn (Try it online!)
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```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;
import Mathematics as math;
import OperatingSystem as os;

mandelbrot( x, y ) {
c = math.Complex( x, y );
z = math.Complex( 0., 0. );
s = -1;
for ( i : algo.range( 50 ) ) {
z = z * z + c;
if ( | z | > 2. ) {
s = i;
break;
}
}
return ( s );
}

main( argv_ ) {
imgSize = term_size( argv_ );
yScale = 2. * yRad / real( imgSize[0] );
xScale = 3.3 / real( imgSize[1] );
glyphTab = [ ".", ":", "-", "+", "+" ].resize( 12, "*" ).resize( 26, "%" ).resize( 50, "@" ).push( " " );
for ( y : algo.range( imgSize[0] ) ) {
line = "";
for ( x : algo.range( imgSize[1] ) ) {
line += glyphTab[ mandelbrot( xScale * real( x ) - 2.3, yScale * real( y ) - yRad ) ];
}
print( line + "\n" );
}
return ( 0 );
}

term_size( argv_ ) {
lines = 25;
columns = 80;
if ( size( argv_ ) == 3 ) {
lines = integer( argv_[1] );
columns = integer( argv_[2] );
} else {
envLines = os.env( "LINES" );
envColumns = os.env( "COLUMNS" );
if ( ( envLines != none ) && ( envColumns != none ) ) {
lines = integer( envLines );
columns = integer( envColumns );
} else {
lines = integer( invoke( ( "/usr/bin/tput", "lines" ) ) ) - 1;
columns = integer( invoke( ( "/usr/bin/tput", "cols" ) ) ) - 1;
}
}
lines -= 1;
columns -= 1;
return ( ( lines, columns ) );
}

invoke( cmd_ ) {
p = os.spawn( cmd_... );
res = "";
out = p.out();
while ( ( line = out.read_line() ) != none ) {
res += line;
}
return ( res );
}

```

Automatically set proper -vf=....:expand with mplayer video player.

Editor (vim) - mplayer
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```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;
import RegularExpressions as re;
import Text as text;
import OperatingSystem as os;
import FileSystem as fs;

path( item_ ) {
return ( "/usr/bin/" + item_ );
}

grep( stream_, pattern_ ) {
pattern = re.compile( pattern_ );
stream = algo.filter(
algo.map( stream_, string.strip ),
@[pattern]( line ) { pattern.match( line ).matched(); }
);
return ( stream );
}

get_clip_info( path_ ) {
mplayer = os.spawn(
path( "mplayer" ), "-vo", "null", "-ao", "null", "-frames", "0", "-identify", path_
);
info = algo.materialize(
algo.map(
grep( mplayer.out(), "\\bID_VIDEO_(HEIGHT|WIDTH)|\\ID_SUBTITLE" ),
@( line ) {
d = text.split( line[3:].to_lower().replace( "video_", "" ), "=" );
return ( ( d[0], integer( d[1] ) ) );
}
), lookup
);
mplayer.wait( 1 );
return ( info );
}

get_screen_info() {
xrandr = os.spawn( path( "xrandr" ), "--current" );
pattern = re.compile( "\\d+x\\d+[+]\\d+[+]\\d+" );
screens = algo.materialize(
algo.map(
grep( xrandr.out(), "\\bconnected\\b" ),
@[pattern]( line ) {
algo.materialize(
algo.map(
text.split( pattern.groups( line )[0].replace( "x", "+" ), "+" ),
integer
), tuple
);
}
),
list
);
xrandr.wait( 1 );
for ( s : screens ) {
x = s[2];
x += s[0];
}
return ( screens.sort( @( s ) { s[2]; } ) );
}

get_active_window_id() {
xprop = os.spawn( path( "xprop" ), "-root", "_NET_ACTIVE_WINDOW" );
id = text.split( xprop.out().read_line().strip(), " " )[-1];
xprop.wait( 1 );
return ( id );
}

get_current_screen( screens_, id_ ) {
xwininfo = os.spawn( path( "xwininfo" ), "-id", id_ );
info = algo.materialize(
algo.map(
grep( xwininfo.out(), "Absolute upper-left" ),
@( line ) { integer( text.split( line, ":" )[-1].strip() ); }
),
tuple
);
xwininfo.wait( 1 );
current = none;
for ( s : screens_ ) {
if ( info[0] < s[2] ) {
current = s[:2];
break;
}
}
return ( current );
}

calc_expand( width_, height_, xRes_, yRes_ ) {
expand = 0;
clipAspectRatio = real( width_ ) / real( height_ );
screenAspectRatio = real( xRes_ ) / real( yRes_ );
if ( clipAspectRatio > screenAspectRatio ) {
scaledHeight = ( width_ * yRes_ ) / xRes_;
expand = | height_ - scaledHeight |;
}
return ( expand );
}

run_orig( argv_ ) {
os.exec( path( "mplayer" ), algo.materialize( argv_[1:], tuple )... );
}

main( argv_ ) {
if ( size( argv_ ) != 2 ) {
run_orig( argv_ );
}
clip = argv_[1];
info = get_clip_info( clip );
if ( ( "width" ∉ info ) || ( "height" ∉ info ) ) {
run_orig( argv_ );
}
haveSubtitles = "subtitle_id" ∈ info;
dotIdx = clip.find_last( "." );
if ( dotIdx >= 0 ) {
base = clip[:dotIdx];
for ( ext : [ ".txt", ".srt" ] ) {
if ( fs.exists( base + ext ) ) {
haveSubtitles = true;
break;
}
}
}
if ( ! haveSubtitles ) {
run_orig( argv_ );
}
width = info["width"];
height = info["height"];
screens = get_screen_info();
id = get_active_window_id();
current = get_current_screen( screens, id );
print( "height = {}, width = {}, screen = {}\n".format( height, width, current ) );
expand = calc_expand( width, height, current... );
os.exec(
path( "mplayer" ),
"-vf", "pp",
);
return ( 0 );
}

/* vim: set ft=huginn */
```

Soution for Narcissist problem.

Editor (vim) - narcissist.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
```#! /bin/sh
exec huginn --no-argv -E "\${0}"
#! huginn

main() {
c = "#! /bin/sh{1}~"
"exec huginn --no-argv -E {3}\${{0}}{3}{1}#! huginn{1}{1}~"
"main() {{{1}{2}c = {3}{0}{3};{1}~"
"{2}s = {3}{3};{1}~"
"{2}while ( ( line = input() ) != none ) {{{1}~"
"{2}{2}s += line;{1}~"
"{2}}}{1}~"
"{2}self = copy( c ).replace( {3}{5}{3}, {3}{3} )~"
".format({1}{2}{2}c.replace( {3}{5}{3}, ~"
"{3}{5}{4}{3}{4}n{4}t{4}t{4}{3}{3} ), ~"
"{3}{4}n{3}, {3}{4}t{3}, {3}{4}{3}{3}, {3}{4}{4}{3}, ~"
"{3}{5}{3}{1}{2});{1}~"
"{2}print( s == self ? {3}1{4}n{3} : {3}0{4}n{3} );{1}}}{1}{1}";
s = "";
while ( ( line = input() ) != none ) {
s += line;
}
self = copy( c ).replace( "~", "" ).format(
c.replace( "~", "~\"\n\t\t\"" ), "\n", "\t", "\"", "\\", "~"
);
print( s == self ? "1\n" : "0\n" );
}

```

Calculate π to an arbitrary precision.

Editor (vim) - pi.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Mathematics as math;

main( argv_ ) {
if ( size( argv_ ) >= 2 ) {
prec = integer( argv_[1] );
print( "pi = {}\n".format( math.pi( number, prec ) ) );
} else {
print( "you must specify a positive number\n" );
}
return ( 0 );
}

```

Program that can be read in reverse and still have exactly the same meaning (Palindrome).

Editor (vim) - palindrome-source.hgn
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
```#! /bin/sh
exec huginn --no-argv -E "\${0}"
#! huginn

main() {
print( "Hello World!\n" );
return ( 0 );
}
//*/
/*//
}
;) 0 ( nruter
;) "n\!dlroW olleH" (tnirp
{ )(niam

nniguh !#
"}0{\$" E- vgra-on-- nniguh cexe
hs/nib/ !#```
Editor (vim) - quine.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
```#! /bin/sh
exec huginn --no-argv -E "\${0}"
#! huginn

main() {
c = "#! /bin/sh{1}~"
"exec huginn --no-argv -E {3}\${{0}}{3}{1}#! huginn{1}{1}~"
"main() {{{1}{2}c = {3}{0}{3};{1}{2}print({1}~"
"{2}{2}copy( c ).replace( {3}{5}{3}, {3}{3} )~"
".format({1}{2}{2}{2}c.replace( {3}{5}{3}, ~"
"{3}{5}{4}{3}{4}n{4}t{4}t{4}{3}{3} ), ~"
"{3}{4}n{3}, {3}{4}t{3}, {3}{4}{3}{3}, {3}{4}{4}{3}, ~"
"{3}{5}{3}{1}{2}{2}){1}{2});{1}}}{1}{1}";
print(
copy( c ).replace( "~", "" ).format(
c.replace( "~", "~\"\n\t\t\"" ), "\n", "\t", "\"", "\\", "~"
)
);
}

```

Apply the ROT13 cipher to the input text.

Editor (vim) - rot13.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
```#! /bin/sh
exec huginn --no-argv -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;

rot13char( c ) {
if ( c.is_alpha() ) {
x = integer( c );
m = integer( c.is_upper() ? 'A' : 'a' );
x -= m;
x += 13;
x %= 26;
x += m;
c = character( x );
}
return ( c );
}

rot13( s ) {
return (
algo.reduce(
algo.map(
algo.map( s, rot13char ),
string
),
@( r, c ) { r + c; }
)
);
}

main() {
while ( ( line = input() ) != none ) {
print( rot13( line.strip() ) + "\n" );
}
}

```

Implementation of minimalistic Scheme interpreter.

Editor (vim) - scheme.hgn (Try it online!)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
```#! /bin/sh
exec huginn -E "\${0}" "\${@}"
#! huginn

import Algorithms as algo;
import Mathematics as math;
import Operators as op;
import Text as text;
import FileSystem as fs;

class Env {
_data = {};
_outer = none;
constructor( params_ = (), args_ = (), outer_ = none ) {
for ( i : algo.range( algo.min( size( params_ ), size( args_ ) ) ) ) {
_data[params_[i]] = args_[i];
}
_outer = outer_;
}
update( dct_ ) {
_data.update( dct_ );
}
set_kv( k, v ) {
_data[k] = v;
}
find( var_ ) {
return ( var_ ∈ _data ? _data : _outer.find( var_ ) );
}
}

cc( x, y ) {
tx = type( x );
if ( tx == boolean ) {
x = x ? 1 : 0;
tx = integer;
}
ty = type( y );
return ( ( ty == real ) && ( tx == integer ) ? real( x ) : x );
}

standard_env() {
env = Env();
bc = type( @[env](){} );
fr = type( type );
env.update( {
"+":          @( x, y ){ cc( x, y ) + cc( y, x ); },
"-":          @( x, y ){ cc( x, y ) - cc( y, x ); },
"*":          @( x, y ){ cc( x, y ) * cc( y, x ); },
"/":          @( x, y ){ cc( x, y ) / cc( y, x ); },
">":          @( x, y ){ cc( x, y ) > cc( y, x ); },
"<":          @( x, y ){ cc( x, y ) < cc( y, x ); },
">=":         @( x, y ){ cc( x, y ) >= cc( y, x ); },
"<=":         @( x, y ){ cc( x, y ) <= cc( y, x ); },
"=":          @( x, y ){ cc( x, y ) == cc( y, x ); },
"pow":        @( x, y ){ real( x ) ^ real( y ); },
"abs":        op.modulus,
"append":     @( x, y ){ cc( x, y ) + cc( y, x ); },
"apply":      @( x, y ){ x( y... ); },
"begin":      @( x... ){ x[-1]; },
"car":        @( x )   { x[0]; },
"cdr":        @( x )   { x[1:]; },
"cons":       @( x, y ){ [x] + y; },
"eq?":        @( x, y ){ cc( x, y ) == cc( y, x ); },
"equal?":     @( x, y ){ cc( x, y ) == cc( y, x ); },
"length":     @( x )   { size( x ); },
"list":       @( x... ){ algo.materialize( x, list ); },
"list?":      @( x )   { type( x ) == list; },
"map":        @( x, y ){ algo.materialize( algo.map( y, x ), list ); },
"max":        algo.max,
"min":        algo.min,
"not":        op.not,
"null?":      @( x )   { x == []; },
"number?":    @( x )   { t = type( x ); ( t == real ) || ( t == integer ); },
"procedure?": @[bc, fr]( x ) { t = type( x ); t == bc || t == fr; },
"round":      @( x )   { type( x ) == real ? math.round( x ) : x; },
"symbol?":    @( x )   { type( x ) == string; },
"sqrt":       @( x )   { math.square_root( real( x ) ); },
"sin":        @( x )   { math.sinus( real( x ) ); },
"cos":        @( x )   { math.cosinus( real( x ) ); },
"pi":         math.pi( real ),
"π":          math.pi( real )
} );
return ( env );
}

to_bool( v ) {
switch ( type( v ) ) {
case ( integer ): {
return ( v != 0 );
}
case ( list ): {}
case ( string ): {
return ( size( v ) > 0 );
}
}
return ( v );
}

eval( x, env ) {
if ( type( x ) == string ) {
return ( env.find( x )[x] );
} else if ( type( x ) != list ) {
return ( x );
}
h = x[0];
his = type( h ) == string;
if ( his ) {
switch ( h ) {
case ( "quote" ): {
return ( x[1] );
}
case ( "if" ): {
test = x[1];
conseq = x[2];
alt = x[3];
exp = to_bool( eval( test, env ) ) ? conseq : alt;
return ( eval( exp, env ) );
}
case ( "lambda" ): {
return (
@[_params: x[1], _body: x[2], _env: env] ( args_... ) {
eval( _body, Env( _params, args_, _env ) );
}
);
}
case ( "define" ): {
env.set_kv( x[1], eval( x[2], env ) );
return ( none );
}
case ( "set!" ): {
env.find( x[1] )[ x[1] ] = eval( x[2], env );
return ( none );
}
}
}
proc = eval( h, env );
args = algo.materialize( algo.map( x[1:], @[env]( _ ){ eval( _, env ); } ), tuple );
return ( proc( args... ) );
}

atom( token ) {
a = token;
try {
return ( token.find( "." ) >= 0 ? real( token ) : integer( token ) );
} catch ( Exception e ) {
}
return ( a );
}

parse( tokens ) {
if ( size( tokens ) == 0 ) {
throw Exception( "unexpected EOF" );
}
token = tokens[0];
tokens.pop_front();
if ( token == "(" ) {
exprs = [];
while ( tokens[0] != ")" ) {
exprs.push( parse( tokens ) );
}
tokens.pop_front();
return ( exprs );
}	else if ( token == ")" ) {
throw Exception( "unexpected )" );
} else {
return ( atom( token ) );
}
}

is_quoted( token_ ) {
isQuoted = false;
l = size( token_ );
if ( l >= 2 ) {
h = token_[0];
isQuoted = ( h == token_[-1] ) && ( ( h == '"' ) || ( h == '\'' ) );
}
return ( isQuoted );
}

split_quotes( str_ ) {
tokens = deque();
singleQuoteCount = 0;
doubleQuoteCount = 0;
escaped = false;
token = "";
white = " \t\r\n\v\f\a\b";
for ( c : str_ ) {
if ( escaped ) {
token += string( c );
escaped = false;
continue;
}
paren = ( c == '(' ) || ( c == ')' );
if ( ( white.find( string( c ) ) >= 0 ) || paren ) {
inQuotes = ( ( doubleQuoteCount % 2 ) != 0 ) || ( ( singleQuoteCount % 2 ) != 0 );
if ( ! inQuotes ) {
if ( size( token ) != 0 ) {
t = copy( token ).replace( "\\ ", " " ).replace( "\\\t", "\t" );
comented = false;
if ( ! is_quoted( t ) ) {
comentPos = t.find( ";" );
if ( comentPos >= 0 ) {
t = t[:comentPos];
comented = true;
}
}
if ( size( t ) > 0 ) {
tokens.push( t );
}
token.clear();
if ( comented ) {
break;
}
}
if ( paren ) {
tokens.push( string( c ) );
}
continue;
}
}
token += string( c );
if ( c == '\\' ) {
escaped = true;
} else if ( ( c == '"' ) && ( ( singleQuoteCount % 2 ) == 0 ) ) {
doubleQuoteCount += 1;
} else if ( ( c == '\'' ) && ( ( doubleQuoteCount % 2 ) == 0 ) ) {
singleQuoteCount += 1;
}
}
if ( size( token ) != 0 ) {
tokens.push( token.replace( "\\ ", " " ).replace( "\\\t", "\t" ) );
}
if ( ( ( doubleQuoteCount % 2 ) != 0 ) || ( ( singleQuoteCount % 2 ) != 0 ) ) {
throw Exception( "Unterminated quotes" );
}
return ( tokens );
}

interpret( lineFeed, env ) {
while ( ( line = lineFeed() ) != none ) {
t = split_quotes( line );
if ( size( t ) == 0 ) {
continue;
}
e = parse( t );
/* print( "{}\n".format( e ) ); */
r = eval( e, env );
if ( r != none ) {
print( "{}\n".format( scm_to_string( r ) ) );
}
}
}

scm_to_string( e ) {
if ( type( e ) == list ) {
e = "({})".format( text.join( algo.materialize( algo.map( e, string ), list ), " " ) );
}
return ( e );
}

main( argv_ ) {
env = standard_env();
if ( size( argv_ ) > 1 ) {
for ( a : argv_[1:] ) {
f = fs.open( a, fs.OPEN_MODE.READ );
interpret( @[f](){ f.read_line(); }, env );
}
} else {
interpret( input, env );
}
return ( 0 );
}

```