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Find the program using PATHEXT #37381

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40ed572
Find the program using PATHEXT
Oct 24, 2016
cc9d064
Added env_lookup fn
Oct 25, 2016
a3c72fd
Added tests for Command::env_lookup()
Oct 26, 2016
63b4c79
Hoist the PATHEXT env lookup
Oct 26, 2016
f364190
Fixed some nitpicks for better code quality
Oct 26, 2016
41a0df0
Added process_command tests for find_program
Oct 26, 2016
6b9b6f1
On batch files set ApplicationName to `cmd.exe`
Oct 28, 2016
abe5e1a
Remove find_program tests
Oct 31, 2016
0444a6d
Add as_vec_u16 fn
Oct 31, 2016
e9e960e
Add tests for make_command_line modifications
Nov 1, 2016
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31 changes: 25 additions & 6 deletions src/libstd/sys/windows/process.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -125,12 +125,9 @@ impl Command {
self.stderr = Some(stderr);
}

pub fn spawn(&mut self, default: Stdio, needs_stdin: bool)
-> io::Result<(Process, StdioPipes)> {
// To have the spawning semantics of unix/windows stay the same, we need
// to read the *child's* PATH if one is provided. See #15149 for more
// details.
let program = self.env.as_ref().and_then(|env| {
pub fn find_program(&mut self) -> Option<Path> {
self.env.as_ref().and_then(|env| {
let env_pathext = env.get("PATHEXT");
for (key, v) in env {
if OsStr::new("PATH") != &**key { continue }

Expand All @@ -141,12 +138,34 @@ impl Command {
.with_extension(env::consts::EXE_EXTENSION);
if fs::metadata(&path).is_ok() {
return Some(path.into_os_string())
} else {
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We typically try to avoid rightward drift where possible, so because of the return above you can omit this else, de-indenting what's below. You can also change what's below to:

let exts = match env_pathext {
    Some(e) => e,
    None => continue,
};
// ...

to get rid of another layer of indentation.

// Windows relies on path extensions to resolve commands.
// Path extensions are found in the PATHEXT environment variable.
if let Some(exts) = env_pathext {
for ext in split_paths(&exts) {
let ext_str = ext.to_string_lossy();
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I think we'll want to call to_str here to not misinterpret OS strings (e.g. lossy may change the meaning), but you can just skip anything that's None. You can probably do:

for ext in split_paths(&ext).filter_map(|e| e.to_str()) {
    // ...
}

let path = path.with_extension(
ext_str.trim_matches('.')
);
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Perhaps this could fit on oneline?

if fs::metadata(&path).is_ok() {
return Some(path.into_os_string())
}
}
}
}
}
break
}
None
});
}

pub fn spawn(&mut self, default: Stdio, needs_stdin: bool)
-> io::Result<(Process, StdioPipes)> {
// To have the spawning semantics of unix/windows stay the same, we need
// to read the *child's* PATH if one is provided. See #15149 for more
// details.
let program = self.find_program();

let mut si = zeroed_startupinfo();
si.cb = mem::size_of::<c::STARTUPINFO>() as c::DWORD;
Expand Down