Basics of Gleam

Conversion of old BASIC programs to Gleam in order to learn the basics of this language.

Tags:

Diamond

// Diamond

// Original version in BASIC:
//   Example included in Vintage BASIC 1.0.3.
//   http://www.vintage-basic.net

// This version in Gleam:
//   Copyright (c) 2026, Marcos Cruz (programandala.net)
//   SPDX-License-Identifier: Fair
//
// Written in 2026-01-12/13.
//
// Last modified 20260207T0111+0100.

import gleam/io

const lines = 17

fn print_character(number: Int, max_number: Int, char: String) {
  case number == max_number {
    True -> Nil
    False -> {
      io.print(char)
      print_character(number + 1, max_number, char)
      }
  }
}

fn print_top_line(line: Int, max_line: Int) {
  case line == max_line {
    True -> Nil
    False -> {
      print_character(1, {lines + 1} / 2 - line + 2, " ")
      print_character(1, line * 2, "*")
      io.println("")
      print_top_line(line + 1, max_line)
    }
  }
}

fn print_bottom_line(line: Int, max_line: Int) {
  case line == max_line {
    True -> Nil
    False -> {
      print_character(1, line + 2, " ")
      print_character(1, {{lines + 1} / 2 - line} * 2, "*")
      io.println("")
      print_bottom_line(line + 1, max_line)
    }
  }
}

pub fn main() {
  print_top_line(1, lines / 2 + 2)
  print_bottom_line(1, lines / 2 + 1)
}

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Gleam

Basics of Gleam

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Diamond

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