Zig dotenv

dotenv.zig

pub const EnvMap = struct {
    arena: std.heap.ArenaAllocator,
    pairs: std.ArrayList(Pair),

    pub const Pair = struct {
        k: []const u8,
        v: []const u8,
    };

    pub fn init_from_dotenv(allocator: std.mem.Allocator) !@This() {
        var arena = std.heap.ArenaAllocator.init(allocator);
        const _alloc = arena.allocator();
        var pairs = std.ArrayList(Pair).init(_alloc);

        // std.fs.cwd().openFile(".env", .{});
        const f = try std.fs.cwd().openFile("../.env", .{});
        var buf = [1]u8{0} ** 1024;

        while (true) {
            const a = try f.reader().readUntilDelimiterOrEof(&buf, '\n') orelse break;
            const i = std.mem.indexOfScalar(u8, a, '=') orelse return error.DotenvNotEqualSign;
            const pair = try pairs.addOne();
            pair.k = try _alloc.dupe(u8, a[0..i]);
            pair.v = try _alloc.dupe(u8, a[i + 1 ..]);
        }

        return .{
            .arena = arena,
            .pairs = pairs,
        };
    }
    pub fn deinit(this: @This()) void {
        this.arena.deinit();
    }

    pub fn get(this: @This(), key: []const u8) ?[]const u8 {
        for (this.pairs.items) |pair| {
            if (std.mem.eql(u8, key, pair.k)) return pair.v;
        }
        return std.os.getenv(key);
    }
};