proffer 0.5.0

Rust code generation
Documentation 
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//!
//!
//! Create a single or collection of generics/trait bounds for functions and other
//! objects.
//!

use serde::{Deserialize, Serialize};
use tera::{Context, Tera};

use crate::traits::SrcCode;

/// Represent a single trait bound
#[derive(Serialize, Deserialize, Default, Clone)]
pub struct Generic {
    pub(crate) generic: String,
    pub(crate) traits: Vec<String>,
}

impl Generic {
    /// Create a new `Generic`
    pub fn new<S: ToString>(id: S) -> Self {
        let mut g = Self::default();
        g.generic = id.to_string();
        g
    }
    /// Set the trait bounds of this generic
    pub fn add_trait_bounds<S: ToString>(&mut self, traits: Vec<S>) -> &mut Self {
        self.traits.extend(traits.iter().map(|t| t.to_string()));
        self
    }
}

/// Represent a collection of trait bounds
#[derive(Serialize, Deserialize, Default, Clone)]
pub struct Generics {
    pub(crate) generics: Vec<Generic>,
}

impl Generics {
    /// Create a new collection of `Generic`s.
    pub fn new(generics: Vec<Generic>) -> Self {
        Self { generics }
    }

    /// Add a `Generic`
    pub fn add_generic(&mut self, generic: Generic) -> &mut Self {
        self.generics.push(generic);
        self
    }

    /// Check how many generics are held here
    pub fn len(&self) -> usize {
        self.generics.len()
    }

    /// Determine if it doesn't have any generics.
    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }
}

impl SrcCode for Generics {
    fn generate(&self) -> String {
        if self.generics.len() > 0 {
            let template = r#"<{{ generic_keys | join(sep=", ") }}>
                where
                    {% for generic in generics %}{{ generic.generic }}: {{ generic.traits | join(sep=" + ") }},
                    {% endfor %}
            "#;
            let mut context = Context::new();
            context.insert(
                "generic_keys",
                &self
                    .generics
                    .iter()
                    .map(|g| g.generic.clone())
                    .collect::<Vec<String>>(),
            );
            context.insert("generics", &self.generics);
            Tera::one_off(template, &context, false).unwrap()
        } else {
            "".to_string()
        }
    }
}