use std::fmt::Write; use std::{fs, path::PathBuf}; fn main() { println!("cargo:rerun-if-changed=README.md"); let readme = fs::read_to_string("README.md").unwrap(); let output = PathBuf::from(std::env::var("OUT_DIR").unwrap()).join("README-lib.md"); let contents = prepare(&readme).unwrap(); fs::write(output, contents).unwrap(); } fn prepare(readme: &str) -> Result<String, Box<dyn std::error::Error>> { // This is a naive implementation to get things off the ground. // We just do a few things for this at the moment: // 1. Strip header stuff // 2. Replace the build document link // 3. Replace serde examples with ignore flags (to avoid feature flagging configuration in docs) let mut cleaned = String::new(); let mut body = false; let mut feature_section = false; let mut feature = String::new(); for line in readme.lines() { if !body { if line.starts_with("[docs]") { body = true; } continue; } // Add the line as is, unless it contains "(BUILD.md)" if line.contains("(BUILD.md)") { write!( cleaned, "{}", &line.replace( "(BUILD.md)", "(https://github.com/paupino/rust-decimal/blob/master/BUILD.md)", ) )?; } else if feature_section && line.starts_with("```rust") { // This is a bit naive, but it's to make the Serde examples cleaner. Should probably // be a bit more "defensive" here. writeln!(cleaned, "```rust")?; writeln!(cleaned, "# use rust_decimal::Decimal;")?; writeln!(cleaned, "# use serde::{{Serialize, Deserialize}};")?; write!(cleaned, "# #[cfg(features = \"{}\")]", feature)?; } else { if !feature_section && line.starts_with("## Features") { feature_section = true; } else if feature_section && line.starts_with("### ") { feature = line.replace("### ", "").replace('`', ""); } write!(cleaned, "{}", line)?; } writeln!(cleaned)?; } Ok(cleaned) }