feat: gix submodule subcommand for simple submodule listing and inf…

…ormation retrieval

gitoxide-core/src/repository/index/entries.rs

@@ -48,12 +48,11 @@ pub(crate) mod function {
             recurse_submodules,
         }: Options,
     ) -> anyhow::Result<()> {
-        use crate::OutputFormat::*;
         let mut out = BufWriter::with_capacity(64 * 1024, out);
         let mut all_attrs = statistics.then(BTreeSet::new);
 
         #[cfg(feature = "serde")]
-        if let Json = format {
+        if let OutputFormat::Json = format {
             out.write_all(b"[\n")?;
         }
 
@@ -70,13 +69,14 @@ pub(crate) mod function {
         )?;
 
         #[cfg(feature = "serde")]
-        if format == Json {
+        if format == OutputFormat::Json {
             out.write_all(b"]\n")?;
             out.flush()?;
             if statistics {
                 serde_json::to_writer_pretty(&mut err, &stats)?;
             }
-        } else if format == Human && statistics {
+        }
+        if format == OutputFormat::Human && statistics {
             out.flush()?;
             writeln!(err, "{stats:#?}")?;
             if let Some(attrs) = all_attrs.filter(|a| !a.is_empty()) {

gitoxide-core/src/repository/mod.rs

@@ -40,5 +40,6 @@ pub mod mailmap;
 pub mod odb;
 pub mod remote;
 pub mod revision;
+pub mod submodule;
 pub mod tree;
 pub mod verify;

gitoxide-core/src/repository/submodule.rs

@@ -0,0 +1,67 @@
+use crate::OutputFormat;
+use anyhow::bail;
+use gix::commit::describe::SelectRef;
+use gix::prelude::ObjectIdExt;
+use gix::{Repository, Submodule};
+
+pub fn list(repo: Repository, mut out: impl std::io::Write, format: OutputFormat) -> anyhow::Result<()> {
+    if format != OutputFormat::Human {
+        bail!("Only human output is supported for now")
+    }
+
+    let Some(submodules) = repo.submodules()? else { return Ok(()) };
+    for sm in submodules {
+        print_sm(sm, &mut out)?;
+    }
+    Ok(())
+}
+
+fn print_sm(sm: Submodule<'_>, out: &mut impl std::io::Write) -> anyhow::Result<()> {
+    let _span = gix::trace::coarse!("print_sm", path = ?sm.path());
+    let state = sm.state()?;
+    let mut sm_repo = sm.open()?;
+    if let Some(repo) = sm_repo.as_mut() {
+        repo.object_cache_size_if_unset(4 * 1024 * 1024);
+    };
+    writeln!(
+        out,
+        " {is_active} {path} {config} head:{head_id} index:{index_id} ({worktree}) [{url}]",
+        is_active = if !sm.is_active()? || !state.repository_exists {
+            "ⅹ"
+        } else {
+            "✓"
+        },
+        path = sm.path()?,
+        config = if state.superproject_configuration {
+            "config:yes"
+        } else {
+            "config:no"
+        },
+        head_id = submodule_short_hash(sm.head_id()?, sm_repo.as_ref()),
+        index_id = submodule_short_hash(sm.index_id()?, sm_repo.as_ref()),
+        worktree = match sm_repo {
+            Some(repo) => {
+                // TODO(name-revision): this is the simple version, `git` gives it
+                // multiple tries https://github.com/git/git/blob/fac96dfbb1c24369ba7d37a5affd8adfe6c650fd/builtin/submodule--helper.c#L161
+                // and even uses `git name-rev`/`git describe --contains` which we can't do yet.
+                repo.head_commit()?
+                    .describe()
+                    .names(SelectRef::AllRefs)
+                    .format()?
+                    .to_string()
+            }
+            None => {
+                "no worktree".to_string()
+            }
+        },
+        url = sm.url()?.to_bstring()
+    )?;
+    Ok(())
+}
+
+fn submodule_short_hash(id: Option<gix::ObjectId>, repo: Option<&Repository>) -> String {
+    id.map_or_else(
+        || "none".to_string(),
+        |id| repo.map_or_else(|| id.to_string(), |repo| id.attach(repo).shorten_or_id().to_string()),
+    )
+}

src/plumbing/main.rs

@@ -135,6 +135,20 @@ pub fn main() -> Result<()> {
     })?;
 
     match cmd {
+        Subcommands::Submodule(platform) => match platform
+            .cmds
+            .unwrap_or(crate::plumbing::options::submodule::Subcommands::List)
+        {
+            crate::plumbing::options::submodule::Subcommands::List => prepare_and_run(
+                "submodule-list",
+                trace,
+                verbose,
+                progress,
+                progress_keep_open,
+                None,
+                move |_progress, out, _err| core::repository::submodule::list(repository(Mode::Lenient)?, out, format),
+            ),
+        },
         #[cfg(feature = "gitoxide-core-tools-archive")]
         Subcommands::Archive(crate::plumbing::options::archive::Platform {
             format,

src/plumbing/options/mod.rs

@@ -122,6 +122,9 @@ pub enum Subcommands {
     Exclude(exclude::Subcommands),
     #[clap(subcommand)]
     Index(index::Subcommands),
+    /// Interact with submodules.
+    #[clap(alias = "submodules")]
+    Submodule(submodule::Platform),
     /// Show which git configuration values are used or planned.
     ConfigTree,
     Config(config::Platform),
@@ -708,5 +711,20 @@ pub mod index {
     }
 }
 
+pub mod submodule {
+
+    #[derive(Debug, clap::Parser)]
+    pub struct Platform {
+        #[clap(subcommand)]
+        pub cmds: Option<Subcommands>,
+    }
+
+    #[derive(Debug, clap::Subcommand)]
+    pub enum Subcommands {
+        /// Print all direct submodules to standard output
+        List,
+    }
+}
+
 ///
 pub mod free;