old-mcdonald-had-a-farm.zig

// Based on source here: 
// https://www.reddit.com/r/programming/comments/fxswxe/c_needs_better_syntax_and_macros/fmx4f0y/
//    (plant "far-field" "Old McDonald's Farm")
//    (harvest "Old McDonald's Farm")
//    (grind "stone-mill")
//    (prepare-dough "sea-salt" "white-sugar" "ev-olive-oil")
//    (make-base)
//    (add-toppings "rosa-tomatoes" "mozzarella" "ham")
//    (bake "stone oven")
//    (enjoy))

// To run this code:
// zig run old-mcdonald-had-a-farm.zig

const std = @import("std");

pub fn main() void {
    const directions = .{
        .{ plant, .{ "far-field", "Old McDonald's Farm" } },
        .{ harvest, .{"Old McDonald's Farm"} },
        .{ grind, .{"stone-mill"} },
        .{ prepareDough, .{ "sea-salt", "white-sugar", "ev-olive-oil" } },
        .{ makeBase, .{} },
        .{ addToppings, .{ "rosa-tomatoes", "mozzarella", "ham" } },
        .{ enjoy, .{} },
    };
    var value: i32 = 10;
    const opts: std.builtin.CallOptions = .{};
    inline for (directions) |direction| {
        value = @call(opts, direction[0], .{value} ++ direction[1]);
    }
    std.debug.warn("result={}\n", .{value});
}

fn plant(prev: i32, a: []const u8, b: []const u8) i32 {
    return prev + 1;
}

fn harvest(prev: i32, a: []const u8) i32 {
    return prev + 1;
}

fn grind(prev: i32, a: []const u8) i32 {
    return prev + 1;
}

fn prepareDough(prev: i32, a: []const u8, b: []const u8, c: []const u8) i32 {
    return prev + 1;
}

fn makeBase(prev: i32) i32 {
    return prev + 1;
}

fn addToppings(prev: i32, a: []const u8, b: []const u8, c: []const u8) i32 {
    return prev + 1;
}

fn enjoy(prev: i32) i32 {
    return prev + 1;
}