1 files changed, 216 insertions, 0 deletions

diff --git a/src/generator/mod.rs b/src/generator/mod.rs
new file mode 100644
index 0000000..b4e1c94
--- /dev/null
+++ b/src/generator/mod.rs
@@ -0,0 +1,216 @@
+pub(crate) mod config;
+mod pandoc;
+
+use self::config::Config;
+//use crate::entities::{
+//    Description, DynEntity, EntitiesManager, EntitiesManagerComponents, Usr,
+//};
+use self::pandoc::into_pandoc;
+use crate::types::Entity;
+
+use anyhow::{ensure, Context, Result};
+use rayon::Scope;
+use thiserror::Error;
+
+use std::collections::BTreeMap;
+use std::io::Write;
+use std::path::Path;
+
+const DEFAULT_CSS: &[u8] = include_bytes!("../../res/style.css");
+
+pub(crate) fn generate(base_dir: &Path, entities: BTreeMap<String, Entity>, config: &Config) -> Result<()> {
+    let md_output_dir = base_dir.join("markdown");
+    let html_output_dir = base_dir.join("html");
+
+    std::fs::create_dir_all(&md_output_dir)
+        .context("Failed to create the markdown output directory")?;
+    std::fs::create_dir_all(&html_output_dir)
+        .context("Failed to create the HTML output directory")?;
+
+    let mut css_tempfile = tempfile::Builder::new()
+        .prefix("style")
+        .suffix(".css")
+        .tempfile()?;
+    css_tempfile.write_all(DEFAULT_CSS)?;
+
+    let css_path = css_tempfile.path();
+    debug!("Generated temporary file with CSS at: {:?}", css_path);
+
+    rayon::scope(|scope| {
+        for (id, entity) in entities {
+            generate_recursively(
+                id,
+                entity,
+                scope,
+                &md_output_dir,
+                &html_output_dir,
+                css_path,
+                config,
+            );
+        }
+    });
+
+    Ok(())
+}
+
+fn generate_recursively<'a>(
+    id: String,
+    entity: Entity,
+    pool: &Scope<'a>,
+    md_output_dir: &'a Path,
+    html_output_dir: &'a Path,
+    css_path: &'a Path,
+    config: &'a Config,
+) {
+    pool.spawn(move |pool| {
+        trace!("Trying to generate {}", id);
+
+        let leftovers = generate_single(
+            &id,
+            entity,
+            &md_output_dir,
+            &html_output_dir,
+            &css_path,
+            config,
+        )
+        .unwrap();
+
+        for (id, entity) in leftovers {
+            generate_recursively(
+                id,
+                entity,
+                pool,
+                md_output_dir,
+                html_output_dir,
+                css_path,
+                config,
+            );
+        }
+    });
+}
+
+fn generate_single(
+    id: &str,
+    entity: Entity,
+    md_output_dir: impl AsRef<Path>,
+    html_output_dir: impl AsRef<Path>,
+    css_path: impl AsRef<Path>,
+    config: &Config
+) -> Result<BTreeMap<String, Entity>> {
+    use std::io::prelude::*;
+    use std::process::{Command, Stdio};
+
+    let md_output_file = md_output_dir.as_ref().join(id);
+    let html_output_file = html_output_dir.as_ref().join(id);
+
+    let mut command = Command::new("pandoc");
+
+    command
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .args(&[
+            "--from=json",
+            "--to=markdown",
+            "--output",
+            md_output_file
+                .to_str()
+                .context("Entity name is not valid UTF-8")?,
+        ]);
+
+    debug!("Launching command: {:?}", command);
+
+    let mut pandoc = command
+        .spawn()
+        .context("Failed to execute Pandoc command")?;
+
+    let (pandoc_ast, leftovers) = into_pandoc(entity, config);
+
+    if log_enabled!(log::Level::Trace) {
+        let json =
+            serde_json::to_string(&pandoc_ast).context("Failed to convert Pandoc AST to JSON")?;
+        trace!("Sending json: {}", json);
+        write!(
+            pandoc.stdin.as_mut().expect("Pandoc stdin not captured"),
+            "{}",
+            &json,
+        )
+        .context("Failed to convert Pandoc AST to JSON")?;
+    } else {
+        serde_json::to_writer(
+            pandoc.stdin.as_mut().expect("Pandoc stdin not captured"),
+            &pandoc_ast,
+        )
+        .context("Failed to convert Pandoc AST to JSON")?;
+    }
+
+    let command_str = format!("{:?}", pandoc);
+
+    let output = pandoc
+        .wait_with_output()
+        .expect("Pandoc command wasn't running");
+
+    ensure!(
+        output.status.success(),
+        CommandError {
+            command: format!("{:?}", command_str),
+            status: output.status,
+            stderr: String::from_utf8(output.stderr).expect("Pandoc outputted invalid UTF-8"),
+        }
+    );
+
+    let mut command = Command::new("pandoc");
+    command
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .args(&[
+            "--from=markdown-raw_tex",
+            "--to=html",
+            "--css",
+            css_path
+                .as_ref()
+                .to_str()
+                .context("CSS path is not valid UTF-8")?,
+            "--standalone",
+            "--self-contained",
+            md_output_file
+                .to_str()
+                .context("Entity name is not valid UTF-8")?,
+            "--output",
+            html_output_file
+                .to_str()
+                .context("Entity name is not valid UTF-8")?,
+        ]);
+
+    let command_str = format!("{:?}", command);
+    debug!("Launching command: {}", command_str);
+
+    let output = command
+        .output()
+        .context("Failed to execute Pandoc command")?;
+
+    ensure!(
+        output.status.success(),
+        CommandError {
+            command: command_str,
+            status: output.status,
+            stderr: String::from_utf8(output.stderr).expect("Pandoc outputted invalid UTF-8"),
+        }
+    );
+
+    Ok(leftovers)
+}
+
+#[derive(Debug, Clone, Error)]
+#[error(
+    "Command {} returned status {:?} and stderr {:?}",
+    command,
+    status,
+    stderr
+)]
+struct CommandError {
+    command: String,
+    status: std::process::ExitStatus,
+    stderr: String,
+}