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Avoid triggering rerun-if-env-changed on RUSTC_BOOTSTRAP if possible

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David Tolnay 2024-03-29 12:54:18 -07:00
parent 7fe6b0203b
commit 4832aa3d29
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GPG key ID: F9BA143B95FF6D82
1 changed files with 49 additions and 6 deletions
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55
src/main.rs
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@ -33,11 +33,11 @@ use crate::opts::{Coloring, Expand, Subcommand};
use crate::unparse::unparse_maximal;
use crate::version::Version;
use bat::{PagingMode, PrettyPrinter};
use clap::{Parser, ValueEnum};
use clap::{CommandFactory as _, Parser, ValueEnum};
use quote::quote;
use std::env;
use std::error::Error as StdError;
use std::ffi::OsString;
use std::ffi::{OsStr, OsString};
use std::io::{self, BufRead, IsTerminal, Write};
use std::iter;
use std::panic::{self, PanicInfo, UnwindSafe};
@ -51,7 +51,12 @@ use termcolor::{Color::Green, ColorChoice, ColorSpec, StandardStream, WriteColor
cargo_subcommand_metadata::description!("Show result of macro expansion");
fn main() {
let result = cargo_expand();
let result = if let Some(wrapper) = env::var_os(CARGO_EXPAND_RUSTC_WRAPPER) {
do_rustc_wrapper(&wrapper)
} else {
do_cargo_expand()
};
process::exit(match result {
Ok(code) => code,
Err(err) => {
@ -67,11 +72,40 @@ fn main() {
});
}
const CARGO_EXPAND_RUSTC_WRAPPER: &str = "CARGO_EXPAND_RUSTC_WRAPPER";
const ARG_Z_UNPRETTY_EXPANDED: &str = "-Zunpretty=expanded";
fn cargo_binary() -> OsString {
env::var_os("CARGO").unwrap_or_else(|| "cargo".to_owned().into())
}
fn cargo_expand() -> Result<i32> {
fn do_rustc_wrapper(wrapper: &OsStr) -> Result<i32> {
let mut rustc_command = env::args_os().skip(1);
let mut cmd = if wrapper != "/" {
Command::new(wrapper)
} else if let Some(rustc) = rustc_command.next() {
Command::new(rustc)
} else {
Subcommand::command().print_help()?;
return Ok(1);
};
let mut is_unpretty_expanded = false;
for arg in rustc_command {
is_unpretty_expanded |= arg == ARG_Z_UNPRETTY_EXPANDED;
cmd.arg(arg);
}
if is_unpretty_expanded {
cmd.env("RUSTC_BOOTSTRAP", "1");
}
let exit_status = cmd.status()?;
let code = exit_status.code().unwrap_or(1);
Ok(code)
}
fn do_cargo_expand() -> Result<i32> {
let Subcommand::Expand(args) = Subcommand::parse();
if args.version {
@ -124,9 +158,18 @@ fn cargo_expand() -> Result<i32> {
// Run cargo
let mut cmd = Command::new(cargo_binary());
apply_args(&mut cmd, &args, &color, &outfile_path);
if needs_rustc_bootstrap() {
cmd.env("RUSTC_BOOTSTRAP", "1");
if let Ok(current_exe) = env::current_exe() {
let original_wrapper = env::var_os("RUSTC_WRAPPER");
let wrapper = original_wrapper.as_deref().unwrap_or(OsStr::new("/"));
cmd.env(CARGO_EXPAND_RUSTC_WRAPPER, wrapper);
cmd.env("RUSTC_WRAPPER", current_exe);
} else {
cmd.env("RUSTC_BOOTSTRAP", "1");
}
}
let code = filter_err(&mut cmd)?;
if !outfile_path.exists() {
@ -402,7 +445,7 @@ fn apply_args(cmd: &mut Command, args: &Expand, color: &Coloring, outfile: &Path
line.arg("-o");
line.arg(outfile);
line.arg("-Zunpretty=expanded");
line.arg(ARG_Z_UNPRETTY_EXPANDED);
if args.verbose {
let mut display = line.clone();