SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.0.rc.1)
// ----

// Create a global map of users
$users: ();

// Add a new user to the global map
@mixin user($name, $availability, $infos) {
  $users: append($users, (
    'name': $name,
    'availability': $availability,
    'infos': $infos
  )) !global;
}

// Display all users
@mixin display-users {
  @each $user in $users {
    #{'.' + map-get($user, 'name')} {
      twitter: #{'@' + map-get($user, 'name')};
      infos: map-get($user, 'infos');
      
      .availability {
        @each $key, $value in map-get($user, 'availability') {
          #{$key}: unquote($value);
        }
      }
    }
  }
}

// Display informations
@mixin display-informations {
  .beer.scss {
    location: "Bierhof Rüdersdorf";
    infos: url("http://www.bierhof.info");
  }
}

// Add a new user
@include user(
  "HugoGiraudel", 
  ( "Monday": "18:00+", "Thursday": "18:00+" ), 
  "Can't guide himself in Berlin. Is mostly lost anywhere."
);

// Add a new user
@include user(
  "Hagenburger", 
  ( "Monday": "18:00+", "Thursday": "18:00+" ), 
  "Je ne parle pas français."
);

// Add a new user
@include user(
  "PascalDuez",
  ( "Monday": "18:00+", "Tuesday": "18:00+", "Wednesday":  "18:00+", "Thursday": "18:00+" ),
  "Ick spreche'n bisschen Deutsch."
);

// Display meet up informations
@include display-informations;

// Display all users
@include display-users;

SassMeister-output.css

@charset "UTF-8";
.beer.scss {
  location: "Bierhof Rüdersdorf";
  infos: url("http://www.bierhof.info");
}

.HugoGiraudel {
  twitter: @HugoGiraudel;
  infos: "Can't guide himself in Berlin. Is mostly lost anywhere.";
}
.HugoGiraudel .availability {
  Monday: 18:00+;
  Thursday: 18:00+;
}

.Hagenburger {
  twitter: @Hagenburger;
  infos: "Je ne parle pas français.";
}
.Hagenburger .availability {
  Monday: 18:00+;
  Thursday: 18:00+;
}

.PascalDuez {
  twitter: @PascalDuez;
  infos: "Ick spreche'n bisschen Deutsch.";
}
.PascalDuez .availability {
  Monday: 18:00+;
  Tuesday: 18:00+;
  Wednesday: 18:00+;
  Thursday: 18:00+;
}