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Merge pull request #34 from yuma140902/refactor-generators
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refactor: generators
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@yuma140902
yuma140902 authored Oct 14, 2023
2 parents 0fd8891 + bab26a3 commit e9d5449
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Showing 3 changed files with 232 additions and 238 deletions.
241 changes: 3 additions & 238 deletions src/generator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,9 @@ use handlebars_generator::HandlebarsGenerator;

use crate::project_config::GeneratorRule;

pub mod echo_generator;
pub mod handlebars_generator;

pub trait Generator: Debug {
fn generate(
&self,
Expand All @@ -32,241 +35,3 @@ pub fn get_generators(project_root: impl AsRef<Path>) -> HashMap<String, Box<dyn
map.insert("echo".to_owned(), Box::new(EchoGenerator));
map
}

mod handlebars_generator {
use std::{
borrow::Borrow,
fs,
path::{Path, PathBuf},
};

use anyhow::Context as _;
use handlebars::{
handlebars_helper, Context, Handlebars, Helper, HelperResult, JsonRender, Output,
RenderContext, RenderError,
};
use path_absolutize::Absolutize;
use serde_json::{Map, Value as Json};
use serde_yaml::Value as Yaml;
use tracing::info;
use walkdir::WalkDir;

use crate::{directory, project_config::GeneratorRule};

use super::{Generator, GeneratorResult};

handlebars_helper!(md2html: |markdown: String| {
let options = pulldown_cmark::Options::empty();
let parser = pulldown_cmark::Parser::new_ext(&markdown, options);
let mut html_output = String::new();
pulldown_cmark::html::push_html(&mut html_output, parser);
html_output
});

fn resolve(
h: &Helper<'_, '_>,
_: &Handlebars<'_>,
ctx: &Context,
_rc: &mut RenderContext<'_, '_>,
out: &mut dyn Output,
) -> HelperResult {
let target_input_path = PathBuf::from(
h.param(0)
.and_then(|v| v.value().as_str())
.ok_or_else(|| RenderError::new("target_input_path not specified"))?,
);
let project_root = PathBuf::from(
ctx.data()
.get("project_root")
.ok_or_else(|| RenderError::new("project_root not specified"))?
.render()
.as_str(),
);
let output_directory = directory::get_output_directory(project_root);
let self_output_filepath = PathBuf::from(
ctx.data()
.get("output_file")
.ok_or_else(|| RenderError::new("output_file not specified"))?
.render()
.as_str(),
);
let self_output_parent = self_output_filepath.parent().ok_or_else(|| {
RenderError::new(format!(
"could not get parent directory for output_file '{}'",
self_output_filepath.display()
))
})?;

let target_output_path = output_directory.join(target_input_path); //TODO:
//rule.export_extension
//rule.export_base
let relative_path = directory::get_relative_path(target_output_path, self_output_parent);
write!(out, "{}", relative_path.display())?;
Ok(())
}

fn setup_handlebars(project_root: impl AsRef<Path>) -> Handlebars<'static> {
let mut handlebars = Handlebars::new();
handlebars.register_helper("md2html", Box::new(md2html));
handlebars.register_helper("resolve", Box::new(resolve));

// enumerate template files
for path in WalkDir::new(directory::get_templates_directory(project_root))
.into_iter()
.filter_map(|e| e.ok())
.map(|e| e.path().to_path_buf())
.filter(|p| p.is_file() && p.extension().map(|ext| ext == "hbs").unwrap_or(false))
{
let abs_path = path
.absolutize()
.with_context(|| format!("could not absolutize path '{}'", path.display()))
.unwrap();
handlebars
.register_template_file(abs_path.to_string_lossy().borrow(), &abs_path)
.with_context(|| format!("could not register template '{}'", abs_path.display()))
.unwrap();
info!("registered template: {}", abs_path.display());
}

handlebars
}

fn split_frontmatter(text: &str) -> (Option<String>, String) {
if let Some((front, body)) = matter::matter(text) {
(Some(front), body)
} else {
(None, text.to_owned())
}
}

fn make_data(
yaml: &Yaml,
content: String,
input_filepath: impl AsRef<Path>,
output_filepath: impl AsRef<Path>,
project_root: impl AsRef<Path>,
) -> Map<String, Json> {
let mut data = Map::new();
data.insert("content".to_owned(), handlebars::to_json(content));
data.insert("front".to_owned(), handlebars::to_json(yaml));
data.insert(
"input_file".to_owned(),
handlebars::to_json(input_filepath.as_ref()),
);
data.insert(
"output_file".to_owned(),
handlebars::to_json(output_filepath.as_ref()),
);
data.insert(
"project_root".to_owned(),
handlebars::to_json(project_root.as_ref()),
);
data
}

#[derive(Debug)]
pub struct HandlebarsGenerator {
handlebars: Handlebars<'static>,
}

impl HandlebarsGenerator {
pub fn new(project_root: impl AsRef<Path>) -> Self {
Self {
handlebars: setup_handlebars(&project_root),
}
}
}

impl Generator for HandlebarsGenerator {
fn generate(
&self,
input_filepath: &Path,
output_filepath: &Path,
project_root: &Path,
rule: &GeneratorRule,
) -> GeneratorResult {
let content = fs::read_to_string(input_filepath)
.context(format!("Reading {:?}", input_filepath))?;
let (maybe_yaml, content) = split_frontmatter(&content);
let yaml = match maybe_yaml {
Some(yaml) => serde_yaml::from_str(&yaml)
.context(format!("Invalid YAML in {:?}", input_filepath))?,
None => serde_yaml::Value::default(),
};

let data = make_data(
&yaml,
content,
input_filepath,
output_filepath,
project_root,
);

let abs_project_root = project_root.absolutize().with_context(|| {
format!(
"could not absolutize project_root '{}'",
project_root.display()
)
})?;

let html_output = self
.handlebars
.render(
Path::new(
rule.template
.as_deref()
.unwrap_or("src/templates/page.html.hbs"),
)
.absolutize_from(abs_project_root.as_ref())
.with_context(|| {
format!("could not absolutize template '{:?}'", rule.template)
})?
.to_string_lossy()
.borrow(),
&data,
)
.context(format!("Input file: {:?}", input_filepath))?;

if let Some(parent) = output_filepath.parent() {
fs::create_dir_all(parent).context(format!("Create directory {:?}", parent))?;
}
fs::write(output_filepath, html_output)
.context(format!("Write {:?}", output_filepath))?;

Ok(())
}
}
}

mod echo_generator {
use std::{fs, path::Path};

use crate::project_config::GeneratorRule;

use super::Generator;

use anyhow::Context as _;

#[derive(Debug)]
pub struct EchoGenerator;

impl Generator for EchoGenerator {
fn generate(
&self,
input_filepath: &std::path::Path,
output_filepath: &std::path::Path,
_project_root: &Path,
_rule: &GeneratorRule,
) -> super::GeneratorResult {
if let Some(parent) = output_filepath.parent() {
fs::create_dir_all(parent).context(format!("Create directory {:?}", parent))?;
}
fs::copy(input_filepath, output_filepath)
.context(format!(
"Copying {:?} to {:?}",
input_filepath, output_filepath
))
.map(|_| ())
}
}
}
30 changes: 30 additions & 0 deletions src/generator/echo_generator.rs
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
use std::{fs, path::Path};

use crate::project_config::GeneratorRule;

use super::Generator;

use anyhow::Context as _;

#[derive(Debug)]
pub struct EchoGenerator;

impl Generator for EchoGenerator {
fn generate(
&self,
input_filepath: &std::path::Path,
output_filepath: &std::path::Path,
_project_root: &Path,
_rule: &GeneratorRule,
) -> super::GeneratorResult {
if let Some(parent) = output_filepath.parent() {
fs::create_dir_all(parent).context(format!("Create directory {:?}", parent))?;
}
fs::copy(input_filepath, output_filepath)
.context(format!(
"Copying {:?} to {:?}",
input_filepath, output_filepath
))
.map(|_| ())
}
}
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