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Michael Zhang 2021-07-06 00:39:06 -05:00
commit 873c97a120
Signed by: michael
GPG key ID: BDA47A31A3C8EE6B
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/target

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[package]
name = "markout"
version = "0.1.0"
authors = ["Michael Zhang <mail@mzhang.io>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0.41"
comrak = "0.10.1"
structopt = "0.3.21"

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use std::fs::File;
use std::io::{Read, self, Write};
use std::path::PathBuf;
use anyhow::{Context, Result};
use comrak::{
nodes::{AstNode, NodeValue},
parse_document, Arena, ComrakOptions,
};
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
struct Opt {
/// The language to filter for
#[structopt(long = "lang", short = "l")]
lang: Option<String>,
/// The file to extract from
file: PathBuf,
}
fn main() -> Result<()> {
let opt = Opt::from_args();
let contents = {
let mut file = File::open(&opt.file)
.with_context(|| format!("could not open target file {:?}", opt.file))?;
let mut contents = String::new();
file.read_to_string(&mut contents)
.with_context(|| format!("could not read target file {:?}", opt.file))?;
contents
};
let mut stdout = io::stdout();
let arena = Arena::new();
let ast_node = parse_document(&arena, &contents, &ComrakOptions::default());
visit_ast(&opt, &mut stdout, ast_node)?;
Ok(())
}
fn visit_ast<'a, W: Write>(opt: &Opt, out: &mut W, node: &'a AstNode<'a>) -> Result<()> {
let ast = node.data.borrow();
match &ast.value {
NodeValue::CodeBlock(code_block) => {
let should_emit = match &opt.lang {
Some(lang) => lang.as_bytes() == &code_block.info,
None => true,
};
if should_emit {
out.write(&code_block.literal)?;
}
}
NodeValue::List(_) | NodeValue::Item(_) | NodeValue::Document => {
// recurse
for child in node.children() {
visit_ast(opt, out, child)?;
}
}
NodeValue::Heading(_) | NodeValue::BlockQuote | NodeValue::Paragraph => {
// don't do anything
}
_ => todo!("unsupported type {:?}", ast.value),
}
Ok(())
}