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const std = @import("std");
const File = std.fs.File;
const warn = std.debug.warn;

const FileOpenError = error {
    AccessDenied,
    FileNotFound,
};

const AllocationError = error {
    OutOfMemory,
};

pub fn main() anyerror!void {
    const stdout = try std.io.getStdOut();

warn("Please enter a new title to add in the library:\n");
    var buffer: [std.mem.page_size]u8 = undefined;

const title = std.io.readLineSlice(buffer[0..]) catch |err| switch (err) {
        error.OutOfMemory => {
            try stdout.write("That title is too long!\n");
            return err;
        },
        else => return err,
    };

if (title.len >= 3) {
        warn("'{}' has been successfully added to the library.\n", title);
    } else {
        warn("That title is too short.\n");
    }

// MUST write into the file in case of success.
    file.write(buffer[0..title]) catch |err| {
        warn("Unable to write to the destination file: {}.\n", @errorName(err));
        return err;
    };
}