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"0.3.13" +async-recursion = "0.3.2" +handlebars = "3.5.4" + +[dependencies.serde] +version = "1.0.125" +features = ["derive"] + +[dependencies.tokio] +version = "1.4.0" +features = ["full"] diff --git a/manager/src/builder.rs b/manager/src/builder.rs new file mode 100644 index 0000000..a0d7175 --- /dev/null +++ b/manager/src/builder.rs @@ -0,0 +1,111 @@ +use crate::{ColorMode, Opt}; +use async_recursion::async_recursion; +use futures::future::join_all; +use handlebars::{Context, Handlebars}; +use serde::Serialize; +use std::ffi::OsStr; +use std::io::{self, ErrorKind}; +use std::path::PathBuf; +use tokio::fs::{copy, create_dir, read_dir, read_to_string, write}; +use tokio::try_join; + +#[derive(Serialize)] +struct TemplateContext<'a> { + hostname: &'a str, + lightmode: bool, + darkmode: bool, +} + +pub async fn build_tree(opt: &Opt) -> io::Result<()> { + let hostname = read_to_string("/etc/hostname").await?; + + let darkmode = opt.color.map(|m| m == ColorMode::Dark).unwrap_or(true); + + let hbs = Handlebars::new(); + + let ctx = Context::wraps(TemplateContext { + hostname: hostname.trim(), + darkmode, + lightmode: !darkmode, + }) + .expect("template context"); + + dir(opt, &ctx, &hbs, PathBuf::new()).await +} + +#[async_recursion] +async fn dir(opt: &Opt, ctx: &Context, hbs: &Handlebars<'_>, relative: PathBuf) -> io::Result<()> { + let template_path = opt.template_dir.join(&relative); + let build_path = opt.build_dir.join(&relative); + + info!("traversing {:?}", template_path); + + match create_dir(&build_path).await { + Ok(_) => {} + Err(e) if e.kind() == ErrorKind::AlreadyExists => {} + Err(e) => return Err(e), + } + + let mut walker = read_dir(&template_path).await?; + + let mut dir_tasks = vec![]; + let mut file_tasks = vec![]; + + while let Some(entry) = walker.next_entry().await? { + let meta = entry.metadata().await?; + let new_relative = relative.join(entry.file_name()); + + if meta.is_dir() { + dir_tasks.push(dir(opt, ctx, hbs, new_relative)); + } else if meta.is_file() { + file_tasks.push(file(opt, ctx, hbs, new_relative)); + } + } + + let dirs = async { + join_all(dir_tasks) + .await + .into_iter() + .collect::, _>>() + }; + + let files = async { + join_all(file_tasks) + .await + .into_iter() + .collect::, _>>() + }; + + try_join!(dirs, files)?; + + Ok(()) +} + +async fn file(opt: &Opt, ctx: &Context, hbs: &Handlebars<'_>, relative: PathBuf) -> io::Result<()> { + let template_path = opt.template_dir.join(&relative); + let mut new_path = opt.build_dir.join(&relative); + + // if it is a handlebars file + if template_path.extension() == Some(OsStr::new("hbs")) { + info!("rendering {:?}", template_path); + let file_data = read_to_string(&template_path).await?; + + // perform templating + // TODO: error handling + let rendered = hbs + .render_template_with_context(&file_data, &ctx) + .expect("template error"); + + // remove .hbs + new_path.set_extension(""); + + // write the rendered file + write(&new_path, &rendered).await?; + } else { + // else just copy the file + info!("copying {:?}", template_path); + copy(&template_path, &new_path).await?; + } + + Ok(()) +} diff --git a/manager/src/linker.rs b/manager/src/linker.rs new file mode 100644 index 0000000..640bd72 --- /dev/null +++ b/manager/src/linker.rs @@ -0,0 +1,91 @@ +use crate::Opt; +use async_recursion::async_recursion; +use futures::future::join_all; +use std::io::{self, ErrorKind}; +use std::path::PathBuf; +use tokio::fs::{create_dir, read_dir, remove_file, symlink}; +use tokio::try_join; + +pub async fn link_tree(opt: &Opt) -> io::Result<()> { + dir(opt, PathBuf::new()).await +} + +#[async_recursion] +async fn dir(opt: &Opt, relative: PathBuf) -> io::Result<()> { + let build_path = opt.build_dir.join(&relative); + let link_path = opt.link_dir.join(&relative); + + info!("traversing {:?}", build_path); + + match create_dir(&link_path).await { + Ok(_) => {} + Err(e) if e.kind() == ErrorKind::AlreadyExists => {} + Err(e) => return Err(e), + } + + let mut walker = read_dir(&build_path).await?; + + let mut dir_tasks = vec![]; + let mut file_tasks = vec![]; + + while let Some(entry) = walker.next_entry().await? { + let meta = entry.metadata().await?; + let new_relative = relative.join(entry.file_name()); + + if meta.is_dir() { + dir_tasks.push(dir(opt, new_relative)); + } else if meta.is_file() { + file_tasks.push(file(opt, new_relative)); + } + } + + let dirs = async { + join_all(dir_tasks) + .await + .into_iter() + .collect::, _>>() + }; + + let files = async { + join_all(file_tasks) + .await + .into_iter() + .collect::, _>>() + }; + + try_join!(dirs, files)?; + + Ok(()) +} + +async fn file(opt: &Opt, relative: PathBuf) -> io::Result<()> { + let build_path = opt.build_dir.join(&relative); + let link_path = opt.link_dir.join(&relative); + + match remove_file(&link_path).await { + Ok(_) => { + info!("removed existing file {:?}", link_path); + } + Err(e) if e.kind() == ErrorKind::NotFound => {} + Err(e) => return Err(e), + }; + + info!("linking {:?} to {:?}", link_path, build_path); + let symlink_content = if build_path.is_absolute() { + build_path + } else { + // TODO: this probably doesn't work for paths containing ".." + // TODO: this doesn't work if link path is absolute + let mut relative_symlink = PathBuf::new(); + for _ in link_path.iter().skip(1).filter(|&c| c == ".") { + relative_symlink.push(".."); + } + relative_symlink.push(&build_path); + + relative_symlink + }; + + symlink(symlink_content, link_path).await?; + + Ok(()) +} diff --git a/manager/src/main.rs b/manager/src/main.rs new file mode 100644 index 0000000..8b72b89 --- /dev/null +++ b/manager/src/main.rs @@ -0,0 +1,42 @@ +#[macro_use] +extern crate log; + +mod builder; +mod linker; + +use builder::build_tree; +use linker::link_tree; +use std::path::PathBuf; +use structopt::StructOpt; +use tokio::io; + +#[derive(StructOpt)] +pub struct Opt { + template_dir: PathBuf, + build_dir: PathBuf, + link_dir: PathBuf, + + #[structopt(subcommand)] + color: Option, +} + +#[derive(StructOpt, PartialEq, Eq, Clone, Copy)] +pub enum ColorMode { + Dark, + Light, +} + +#[tokio::main] +async fn main() -> io::Result<()> { + pretty_env_logger::init(); + + let opt = Opt::from_args(); + + info!("building tree"); + build_tree(&opt).await?; + + info!("linking tree"); + link_tree(&opt).await?; + + Ok(()) +}