Add std::os::windows::process::CommandExt, with set_creation_flags and add_creation_flags methods. Fixes #37827

This adds a CommandExt trait for Windows along with an implementation of it
for std::process::Command with methods to set the process creation flags that
are passed to CreateProcess.

1 files changed, 30 insertions, 1 deletions

diff --git a/src/libstd/sys/windows/ext/process.rs b/src/libstd/sys/windows/ext/process.rs
index bce32959a23..f5bf3354637 100644
--- a/src/libstd/sys/windows/ext/process.rs
+++ b/src/libstd/sys/windows/ext/process.rs
@@ -15,7 +15,7 @@
 use os::windows::io::{FromRawHandle, RawHandle, AsRawHandle, IntoRawHandle};
 use process;
 use sys;
-use sys_common::{AsInner, FromInner, IntoInner};
+use sys_common::{AsInnerMut, AsInner, FromInner, IntoInner};
 
 #[stable(feature = "process_extensions", since = "1.2.0")]
 impl FromRawHandle for process::Stdio {
@@ -97,3 +97,32 @@ impl ExitStatusExt for process::ExitStatus {
         process::ExitStatus::from_inner(From::from(raw))
     }
 }
+
+/// Windows-specific extensions to the `std::process::Command` builder
+#[unstable(feature = "windows_process_extensions", issue = "37827")]
+pub trait CommandExt {
+    /// Sets the [process creation flags][1] to be passed to `CreateProcess`.
+    ///
+    /// These will always be ORed with `CREATE_UNICODE_ENVIRONMENT`.
+    /// [1]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863(v=vs.85).aspx
+    #[unstable(feature = "windows_process_extensions", issue = "37827")]
+    fn set_creation_flags(&mut self, flags: u32) -> &mut process::Command;
+    /// Add `flags` to the the [process creation flags][1] to be passed to `CreateProcess`.
+    ///
+    /// These will always be ORed with `CREATE_UNICODE_ENVIRONMENT`.
+    /// [1]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684863(v=vs.85).aspx
+    #[unstable(feature = "windows_process_extensions", issue = "37827")]
+    fn add_creation_flags(&mut self, flags: u32) -> &mut process::Command;
+}
+
+#[unstable(feature = "windows_process_extensions", issue = "37827")]
+impl CommandExt for process::Command {
+    fn set_creation_flags(&mut self, flags: u32) -> &mut process::Command {
+        self.as_inner_mut().set_creation_flags(flags);
+        self
+    }
+    fn add_creation_flags(&mut self, flags: u32) -> &mut process::Command {
+        self.as_inner_mut().add_creation_flags(flags);
+        self
+    }
+}