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[rustc.git] / src / tools / error_index_generator / build.rs
1 use std::path::PathBuf;
2 use std::{env, fs};
3 use walkdir::WalkDir;
4
5 fn main() {
6 // The src directory (we are in src/tools/error_index_generator)
7 // Note that we could skip one of the .. but this ensures we at least loosely find the right
8 // directory.
9 let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
10 let dest = out_dir.join("error_codes.rs");
11
12 let error_codes_path = "../../../compiler/rustc_error_codes/src/error_codes.rs";
13
14 println!("cargo:rerun-if-changed={}", error_codes_path);
15 let file = fs::read_to_string(error_codes_path)
16 .unwrap()
17 .replace(": include_str!(\"./error_codes/", ": include_str!(\"./");
18 let contents = format!("(|| {{\n{}\n}})()", file);
19 fs::write(&out_dir.join("all_error_codes.rs"), &contents).unwrap();
20
21 // We copy the md files as well to the target directory.
22 for entry in WalkDir::new("../../../compiler/rustc_error_codes/src/error_codes") {
23 let entry = entry.unwrap();
24 match entry.path().extension() {
25 Some(s) if s == "md" => {}
26 _ => continue,
27 }
28 println!("cargo:rerun-if-changed={}", entry.path().to_str().unwrap());
29 let md_content = fs::read_to_string(entry.path()).unwrap();
30 fs::write(&out_dir.join(entry.file_name()), &md_content).unwrap();
31 }
32
33 let mut all = String::new();
34 all.push_str(
35 r###"
36 fn register_all() -> Vec<(&'static str, Option<&'static str>)> {
37 let mut long_codes: Vec<(&'static str, Option<&'static str>)> = Vec::new();
38 macro_rules! register_diagnostics {
39 ($($ecode:ident: $message:expr,)*) => (
40 register_diagnostics!{$($ecode:$message,)* ;}
41 );
42
43 ($($ecode:ident: $message:expr,)* ; $($code:ident,)*) => (
44 $(
45 {long_codes.extend([
46 (stringify!($ecode), Some($message)),
47 ].iter());}
48 )*
49 $(
50 {long_codes.extend([
51 stringify!($code),
52 ].iter().cloned().map(|s| (s, None)).collect::<Vec<_>>());}
53 )*
54 )
55 }
56 "###,
57 );
58 all.push_str(r#"include!(concat!(env!("OUT_DIR"), "/all_error_codes.rs"));"#);
59 all.push_str("\nlong_codes\n");
60 all.push_str("}\n");
61
62 fs::write(&dest, all).unwrap();
63 }