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Rollup merge of #45782 - frewsxcv:frewsxcv-shorthands-helpers, r=manishearth

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Display all emission types in error msg if user inputs invalid option.

before:

```
> rustc --emit foo
error: unknown emission type: `foo`
```

after:

```
> rustc --emit foo
error: unknown emission type: `foo` - expected one of: `llvm-bc`, `asm`, `llvm-ir`, `mir`, `obj`, `metadata`, `link`, `dep-info`
```
This commit is contained in:
kennytm 2017-11-07 15:52:14 +08:00
commit 1683b830a8
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GPG Key ID: FEF6C8051D0E013C
1 changed files with 35 additions and 13 deletions
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48
src/librustc/session/config.rs
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@ -138,6 +138,34 @@ impl OutputType {
}
}
fn from_shorthand(shorthand: &str) -> Option<Self> {
Some(match shorthand {
"asm" => OutputType::Assembly,
"llvm-ir" => OutputType::LlvmAssembly,
"mir" => OutputType::Mir,
"llvm-bc" => OutputType::Bitcode,
"obj" => OutputType::Object,
"metadata" => OutputType::Metadata,
"link" => OutputType::Exe,
"dep-info" => OutputType::DepInfo,
_ => return None,
})
}
fn shorthands_display() -> String {
format!(
"`{}`, `{}`, `{}`, `{}`, `{}`, `{}`, `{}`, `{}`",
OutputType::Bitcode.shorthand(),
OutputType::Assembly.shorthand(),
OutputType::LlvmAssembly.shorthand(),
OutputType::Mir.shorthand(),
OutputType::Object.shorthand(),
OutputType::Metadata.shorthand(),
OutputType::Exe.shorthand(),
OutputType::DepInfo.shorthand(),
)
}
pub fn extension(&self) -> &'static str {
match *self {
OutputType::Bitcode => "bc",
@ -1485,19 +1513,13 @@ pub fn build_session_options_and_crate_config(matches: &getopts::Matches)
for list in matches.opt_strs("emit") {
for output_type in list.split(',') {
let mut parts = output_type.splitn(2, '=');
let output_type = match parts.next().unwrap() {
"asm" => OutputType::Assembly,
"llvm-ir" => OutputType::LlvmAssembly,
"mir" => OutputType::Mir,
"llvm-bc" => OutputType::Bitcode,
"obj" => OutputType::Object,
"metadata" => OutputType::Metadata,
"link" => OutputType::Exe,
"dep-info" => OutputType::DepInfo,
part => {
early_error(error_format, &format!("unknown emission type: `{}`",
part))
}
let shorthand = parts.next().unwrap();
let output_type = match OutputType::from_shorthand(shorthand) {
Some(output_type) => output_type,
None => early_error(error_format, &format!(
"unknown emission type: `{}` - expected one of: {}",
shorthand, OutputType::shorthands_display(),
)),
};
let path = parts.next().map(PathBuf::from);
output_types.insert(output_type, path);