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47f7bed677
1. Generally we should prefer to use the `log` crate. 2. I very often accidentally commit `eprintln`s. When we should use `println` or `eprintln`, it's not too bad to be a bit more verbose and ignore the lint rule.
58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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#[inline(always)]
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pub fn get_v8_flags_from_env() -> Vec<String> {
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std::env::var("DENO_V8_FLAGS")
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.ok()
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.map(|flags| flags.split(',').map(String::from).collect::<Vec<String>>())
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.unwrap_or_default()
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}
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#[inline(always)]
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pub fn construct_v8_flags(
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default_v8_flags: &[String],
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v8_flags: &[String],
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env_v8_flags: Vec<String>,
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) -> Vec<String> {
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std::iter::once("UNUSED_BUT_NECESSARY_ARG0".to_owned())
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.chain(default_v8_flags.iter().cloned())
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.chain(env_v8_flags)
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.chain(v8_flags.iter().cloned())
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.collect::<Vec<_>>()
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}
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pub fn init_v8_flags(
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default_v8_flags: &[String],
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v8_flags: &[String],
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env_v8_flags: Vec<String>,
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) {
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if default_v8_flags.is_empty()
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&& v8_flags.is_empty()
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&& env_v8_flags.is_empty()
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{
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return;
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}
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let v8_flags_includes_help = env_v8_flags
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.iter()
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.chain(v8_flags)
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.any(|flag| flag == "-help" || flag == "--help");
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// Keep in sync with `standalone.rs`.
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let v8_flags = construct_v8_flags(default_v8_flags, v8_flags, env_v8_flags);
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let unrecognized_v8_flags = deno_core::v8_set_flags(v8_flags)
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.into_iter()
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.skip(1)
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.collect::<Vec<_>>();
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#[allow(clippy::print_stderr)]
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if !unrecognized_v8_flags.is_empty() {
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for f in unrecognized_v8_flags {
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eprintln!("error: V8 did not recognize flag '{f}'");
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}
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eprintln!("\nFor a list of V8 flags, use '--v8-flags=--help'");
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std::process::exit(1);
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}
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if v8_flags_includes_help {
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std::process::exit(0);
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}
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}
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