feat: gix status auto-writes changed indices.

This prevents expensive operations to re-occour.

Author: Byron

gitoxide-core/src/repository/status.rs

@@ -21,6 +21,7 @@ pub struct Options {
     pub submodules: Submodules,
     pub thread_limit: Option<usize>,
     pub statistics: bool,
+    pub allow_write: bool,
 }
 
 pub fn show(
@@ -34,6 +35,7 @@ pub fn show(
         // TODO: implement this
         submodules: _,
         thread_limit,
+        allow_write,
         statistics,
     }: Options,
 ) -> anyhow::Result<()> {
@@ -88,6 +90,13 @@ pub fn show(
         options,
     )?;
 
+    if outcome.entries_updated != 0 && allow_write {
+        index.write(gix::index::write::Options {
+            extensions: Default::default(),
+            skip_hash: false, // TODO: make this based on configuration
+        })?;
+    }
+
     if statistics {
         writeln!(err, "{outcome:#?}").ok();
     }

src/plumbing/main.rs

@@ -136,6 +136,7 @@ pub fn main() -> Result<()> {
         Subcommands::Status(crate::plumbing::options::status::Platform {
             statistics,
             submodules,
+            no_write,
             pathspec,
         }) => prepare_and_run(
             "status",
@@ -156,6 +157,7 @@ pub fn main() -> Result<()> {
                         format,
                         statistics,
                         thread_limit: thread_limit.or(cfg!(target_os = "macos").then_some(3)), // TODO: make this a configurable when in `gix`, this seems to be optimal on MacOS, linux scales though!
+                        allow_write: !no_write,
                         submodules: match submodules {
                             Submodules::All => core::repository::status::Submodules::All,
                             Submodules::RefChange => core::repository::status::Submodules::RefChange,

src/plumbing/options/mod.rs

@@ -208,6 +208,9 @@ pub mod status {
         /// Print additional statistics to help understanding performance.
         #[clap(long, short = 's')]
         pub statistics: bool,
+        /// Don't write back a changed index, which forces this operation to always be idempotent.
+        #[clap(long)]
+        pub no_write: bool,
         /// The git path specifications to list attributes for, or unset to read from stdin one per line.
         #[clap(value_parser = CheckPathSpec)]
         pub pathspec: Vec<BString>,