Macro story

macro_rules! story {
    ($this:ident $cmd:ident, $story_title:ident by $story_teller:ty; $help:literal; $($command:literal => $code:tt)*) => { ... };
}

A story always takes the same form. It is addressed to the method that it will generate for the author. It is always followed by the prompt that will be displayed when the user asks for help. Then, it’s a sequence of commands that need to be interpreted.

use texttale::{story, StoryElement, TextTale};

struct Player<T: TextTale> {
    name: String,
    age: u8,
    gender: String,
    race: String,
    tale: T,
}

story! {
    self cmd,
    character by Player<T>;
"Craft your character.

help: .... Print this help menu.
name: .... Set your character's name.
age: ..... Set your character's age.
gender: .. Set your character's gender.
race: .... Set your character's race.
print: ... Print your character.
save: .... Commit changes to the configuration and return to previous menu.
";
    "name" => {
        self.name = cmd[1..].to_vec().join(" ");
        StoryElement::Continue
    }
    "gender" => {
        self.gender = cmd[1..].to_vec().join(" ");
        StoryElement::Continue
    }
    "race" => {
        self.race = cmd[1..].to_vec().join(" ");
        StoryElement::Continue
    }
    "age" => {
        if cmd.len() != 2 {
            writeln!(self.tale, "USAGE: age [age]").unwrap();
        } else {
            match cmd[1].parse::<u8>() {
                Ok(age) => {
                    self.age = age;
                },
                Err(err) => {
                    writeln!(self.tale, "invalid age: {}", err).unwrap();
                },
            };
        }
        StoryElement::Continue
    }
    "print" => {
        let debug = format!("{:#?}", self);
        writeln!(self.tale, "{}", debug).unwrap();
        StoryElement::Continue
    }
    "save" => {
        StoryElement::Return
    }
}

impl<T: TextTale> std::fmt::Debug for Player<T> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Player")
            .field("name", &self.name)
            .field("age", &self.age)
            .field("gender", &self.gender)
            .field("race", &self.race)
            .finish()
    }
}