src/tools/tier-check/src/main.rs

   1 //! This is a script for validating the platform support page in the rustc book.
   2 //!
   3 //! The script takes two arguments, the path to the Platform Support source
   4 //! page, and the second argument is the path to `rustc`.
   5
   6 use std::collections::HashSet;
   7
   8 fn main() {
   9     let mut args = std::env::args().skip(1);
  10     let src = args.next().expect("expected source file as first argument");
  11     let filename = std::path::Path::new(&src).file_name().unwrap().to_str().unwrap();
  12     let rustc = args.next().expect("expected rustc as second argument");
  13     let output = std::process::Command::new(rustc)
  14         .arg("--print=target-list")
  15         .output()
  16         .expect("rustc should run");
  17     if !output.status.success() {
  18         eprintln!("rustc failed to run");
  19         std::process::exit(0);
  20     }
  21     let stdout = std::str::from_utf8(&output.stdout).expect("utf8");
  22     let target_list: HashSet<_> = stdout.lines().collect();
  23
  24     let doc_targets_md = std::fs::read_to_string(&src).expect("failed to read input source");
  25     let doc_targets: HashSet<_> = doc_targets_md
  26         .lines()
  27         .filter(|line| line.starts_with('`') && line.contains('|'))
  28         .map(|line| line.split('`').skip(1).next().expect("expected target code span"))
  29         .collect();
  30
  31     let missing: Vec<_> = target_list.difference(&doc_targets).collect();
  32     let extra: Vec<_> = doc_targets.difference(&target_list).collect();
  33     for target in &missing {
  34         eprintln!(
  35             "error: target `{}` is missing from {}\n\
  36             If this is a new target, please add it to {}.",
  37             target, filename, src
  38         );
  39     }
  40     for target in &extra {
  41         eprintln!(
  42             "error: target `{}` is in {}, but does not appear in the rustc target list\n\
  43             If the target has been removed, please edit {} and remove the target.",
  44             target, filename, src
  45         );
  46     }
  47     if !missing.is_empty() || !extra.is_empty() {
  48         std::process::exit(1);
  49     }
  50 }