Add first attempt at tangler

2 files changed, 63 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ccf3662
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "pangler"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+lazy_static = "1.4"
+regex = "1.5"
+pandoc = "0.8"
+pandoc_ast = "0.8"
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..13824df
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,50 @@
+use std::io::Result;
+use std::path::PathBuf;
+use std::collections::HashMap;
+use lazy_static::lazy_static;
+use regex::{Captures,Regex};
+use pandoc::{InputFormat,InputKind,OutputFormat,OutputKind,Pandoc};
+use pandoc_ast::Block;
+
+type Blocks<'a> = HashMap<&'a str,&'a str>;
+
+fn build(blocks: &Blocks, entry: &str) -> String {
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"<<([^>\s]+)>>").unwrap();
+    }
+    if let Some(entry) = blocks.get(entry).clone() {
+        RE.replace_all(entry, |caps: &Captures| blocks.get(&caps[1]).expect("Block not present")).to_string()
+    } else {
+        String::from("")
+    }
+}
+
+fn main() -> Result<()> {
+    let mut pandoc = Pandoc::new();
+    /* Pandoc input setup */
+    pandoc.set_input(InputKind::Files(vec![PathBuf::from("test.md")]));
+    pandoc.set_input_format(InputFormat::Markdown, vec![]);
+    /* Pandoc output setup */
+    pandoc.set_output(OutputKind::Pipe);
+    pandoc.set_output_format(OutputFormat::Json, vec![]);
+    /* Process literate program */
+    pandoc.add_filter(|json| pandoc_ast::filter(json, |pandoc| {
+        let mut blocks: Blocks = HashMap::new();
+        pandoc.blocks.iter().for_each(|block|
+            if let Block::CodeBlock(attr, code) = block {
+                if attr.0.len() > 0 {
+                    blocks.insert(&attr.0, &code);
+                } /*else {
+                    println!("The following code has no ID:");
+                    code.lines().for_each(|l| println!("    {}", l));
+                }*/
+            }
+        );
+        let program = build(&blocks, "main.rs");
+        println!("{}", program);
+        pandoc
+    }));
+    pandoc.execute().unwrap();
+    Ok(())
+}
+