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[rust.git] / src / tools / error_index_generator / build.rs
1 use walkdir::WalkDir;
2 use std::path::PathBuf;
3 use std::{env, fs};
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 = "../../../src/librustc_error_codes/error_codes.rs";
13
14     println!("cargo:rerun-if-changed={}", error_codes_path);
15     let file = fs::read_to_string(error_codes_path).unwrap()
16                   .replace("crate::register_diagnostics!", "register_diagnostics!")
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("../../../src/librustc_error_codes/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(r###"
35 fn register_all() -> Vec<(&'static str, Option<&'static str>)> {
36     let mut long_codes: Vec<(&'static str, Option<&'static str>)> = Vec::new();
37     macro_rules! register_diagnostics {
38         ($($ecode:ident: $message:expr,)*) => (
39             register_diagnostics!{$($ecode:$message,)* ;}
40         );
41
42         ($($ecode:ident: $message:expr,)* ; $($code:ident,)*) => (
43             $(
44                 {long_codes.extend([
45                     (stringify!($ecode), Some($message)),
46                 ].iter());}
47             )*
48             $(
49                 {long_codes.extend([
50                     stringify!($code),
51                 ].iter().cloned().map(|s| (s, None)).collect::<Vec<_>>());}
52             )*
53         )
54     }
55 "###);
56     all.push_str(r#"include!(concat!(env!("OUT_DIR"), "/all_error_codes.rs"));"#);
57     all.push_str("\nlong_codes\n");
58     all.push_str("}\n");
59
60     fs::write(&dest, all).unwrap();
61 }