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|
//! A template engine backed by [Tera] for rendering Files.
use std::collections::HashMap;
use anyhow::{Context as AnyhowContext, Result};
use serde_json::{from_value, to_value, Value};
use tera::{self, Tera};
use crate::config::RenderConfig;
use crate::context::Context;
use crate::rendering::{
render_crate_bazel_label, render_crate_bazel_repository, render_crate_build_file,
render_module_label, Platforms,
};
use crate::select::Select;
use crate::utils::sanitize_repository_name;
pub struct TemplateEngine {
engine: Tera,
context: tera::Context,
}
impl TemplateEngine {
pub fn new(render_config: &RenderConfig) -> Self {
let mut tera = Tera::default();
tera.add_raw_templates(vec![
(
"partials/module/aliases_map.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/partials/module/aliases_map.j2"
)),
),
(
"partials/module/deps_map.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/partials/module/deps_map.j2"
)),
),
(
"partials/module/repo_git.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/partials/module/repo_git.j2"
)),
),
(
"partials/module/repo_http.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/partials/module/repo_http.j2"
)),
),
(
"partials/header.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/partials/header.j2"
)),
),
(
"module_bzl.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/module_bzl.j2"
)),
),
(
"vendor_module.j2",
include_str!(concat!(
env!("CARGO_MANIFEST_DIR"),
"/src/rendering/templates/vendor_module.j2"
)),
),
])
.unwrap();
tera.register_function(
"crate_build_file",
crate_build_file_fn_generator(render_config.build_file_template.clone()),
);
tera.register_function(
"crate_label",
crate_label_fn_generator(
render_config.crate_label_template.clone(),
render_config.repository_name.clone(),
),
);
tera.register_function(
"crate_repository",
crate_repository_fn_generator(
render_config.crate_repository_template.clone(),
render_config.repository_name.clone(),
),
);
tera.register_function(
"crates_module_label",
module_label_fn_generator(render_config.crates_module_template.clone()),
);
let mut context = tera::Context::new();
context.insert("default_select_list", &Select::<String>::default());
context.insert("repository_name", &render_config.repository_name);
context.insert("vendor_mode", &render_config.vendor_mode);
context.insert("regen_command", &render_config.regen_command);
context.insert("Null", &tera::Value::Null);
context.insert(
"default_package_name",
&match render_config.default_package_name.as_ref() {
Some(pkg_name) => format!("\"{pkg_name}\""),
None => "None".to_owned(),
},
);
Self {
engine: tera,
context,
}
}
fn new_tera_ctx(&self) -> tera::Context {
self.context.clone()
}
pub fn render_header(&self) -> Result<String> {
let context = self.new_tera_ctx();
let mut header = self
.engine
.render("partials/header.j2", &context)
.context("Failed to render header comment")?;
header.push('\n');
Ok(header)
}
pub fn render_module_bzl(&self, data: &Context, platforms: &Platforms) -> Result<String> {
let mut context = self.new_tera_ctx();
context.insert("context", data);
context.insert("platforms", platforms);
self.engine
.render("module_bzl.j2", &context)
.context("Failed to render crates module")
}
pub fn render_vendor_module_file(&self, data: &Context) -> Result<String> {
let mut context = self.new_tera_ctx();
context.insert("context", data);
self.engine
.render("vendor_module.j2", &context)
.context("Failed to render vendor module")
}
}
/// A convienience wrapper for parsing parameters to tera functions
macro_rules! parse_tera_param {
($param:literal, $param_type:ty, $args:ident) => {
match $args.get($param) {
Some(val) => match from_value::<$param_type>(val.clone()) {
Ok(v) => v,
Err(_) => {
return Err(tera::Error::msg(format!(
"The `{}` paramater could not be parsed as a String.",
$param
)))
}
},
None => {
return Err(tera::Error::msg(format!(
"No `{}` parameter was passed.",
$param
)))
}
}
};
}
/// Convert a crate name into a module name by applying transforms to invalid characters.
fn crate_build_file_fn_generator(template: String) -> impl tera::Function {
Box::new(
move |args: &HashMap<String, Value>| -> tera::Result<Value> {
let name = parse_tera_param!("name", String, args);
let version = parse_tera_param!("version", String, args);
match to_value(render_crate_build_file(&template, &name, &version)) {
Ok(v) => Ok(v),
Err(_) => Err(tera::Error::msg("Failed to generate crate's BUILD file")),
}
},
)
}
/// Convert a file name to a Bazel label
fn module_label_fn_generator(template: String) -> impl tera::Function {
Box::new(
move |args: &HashMap<String, Value>| -> tera::Result<Value> {
let file = parse_tera_param!("file", String, args);
let label = match render_module_label(&template, &file) {
Ok(v) => v,
Err(e) => return Err(tera::Error::msg(e)),
};
match to_value(label.to_string()) {
Ok(v) => Ok(v),
Err(_) => Err(tera::Error::msg("Failed to generate crate's BUILD file")),
}
},
)
}
/// Convert a crate name into a module name by applying transforms to invalid characters.
fn crate_label_fn_generator(template: String, repository_name: String) -> impl tera::Function {
Box::new(
move |args: &HashMap<String, Value>| -> tera::Result<Value> {
let name = parse_tera_param!("name", String, args);
let version = parse_tera_param!("version", String, args);
let target = parse_tera_param!("target", String, args);
match to_value(sanitize_repository_name(&render_crate_bazel_label(
&template,
&repository_name,
&name,
&version,
&target,
))) {
Ok(v) => Ok(v),
Err(_) => Err(tera::Error::msg("Failed to generate crate's label")),
}
},
)
}
/// Convert a crate name into a module name by applying transforms to invalid characters.
fn crate_repository_fn_generator(template: String, repository_name: String) -> impl tera::Function {
Box::new(
move |args: &HashMap<String, Value>| -> tera::Result<Value> {
let name = parse_tera_param!("name", String, args);
let version = parse_tera_param!("version", String, args);
match to_value(sanitize_repository_name(&render_crate_bazel_repository(
&template,
&repository_name,
&name,
&version,
))) {
Ok(v) => Ok(v),
Err(_) => Err(tera::Error::msg("Failed to generate crate repository name")),
}
},
)
}
|
