feat: add first debug version of gix tag list

gitoxide-core/src/repository/mod.rs

@@ -44,6 +44,7 @@ pub mod remote;
 pub mod revision;
 pub mod status;
 pub mod submodule;
+pub mod tag;
 pub mod tree;
 pub mod verify;
 pub mod worktree;

gitoxide-core/src/repository/tag.rs

@@ -0,0 +1,31 @@
+pub fn list(repo: gix::Repository, out: &mut dyn std::io::Write) -> anyhow::Result<()> {
+    let platform = repo.references()?;
+
+    for mut reference in (platform.tags()?).flatten() {
+        let tag = reference.peel_to_tag();
+        let tag_ref = tag.as_ref().map(gix::Tag::decode);
+
+        // `name` is the name of the file in `refs/tags/`. This applies to both lightweight as well
+        // as annotated tags.
+        let name = reference.name().shorten();
+
+        match tag_ref {
+            Ok(Ok(tag_ref)) => {
+                // `tag_name` is the name provided by the user via `git tag -a/-s/-u`. It is only
+                // present for annotated tags.
+                let tag_name = tag_ref.name;
+
+                if name == tag_name {
+                    writeln!(out, "{name} *")?;
+                } else {
+                    writeln!(out, "{name} [tag name: {}]", tag_ref.name)?;
+                }
+            }
+            _ => {
+                writeln!(out, "{name}")?;
+            }
+        }
+    }
+
+    Ok(())
+}

src/plumbing/main.rs

@@ -17,7 +17,7 @@ use crate::{
     plumbing::{
         options::{
             attributes, commit, commitgraph, config, credential, exclude, free, fsck, index, mailmap, merge, odb,
-            revision, tree, Args, Subcommands,
+            revision, tag, tree, Args, Subcommands,
         },
         show_progress,
     },
@@ -1304,6 +1304,17 @@ pub fn main() -> Result<()> {
                 },
             ),
         },
+        Subcommands::Tag(cmd) => match cmd {
+            tag::Subcommands::List => prepare_and_run(
+                "tag-list",
+                trace,
+                auto_verbose,
+                progress,
+                progress_keep_open,
+                None,
+                move |_progress, out, _err| core::repository::tag::list(repository(Mode::Lenient)?, out),
+            ),
+        },
         Subcommands::Tree(cmd) => match cmd {
             tree::Subcommands::Entries {
                 treeish,

src/plumbing/options/mod.rs

@@ -100,6 +100,9 @@ pub enum Subcommands {
     /// Interact with commit objects.
     #[clap(subcommand)]
     Commit(commit::Subcommands),
+    /// Interact with tag objects.
+    #[clap(subcommand)]
+    Tag(tag::Subcommands),
     /// Verify the integrity of the entire repository
     Verify {
         #[clap(flatten)]
@@ -928,6 +931,14 @@ pub mod commit {
     }
 }
 
+pub mod tag {
+    #[derive(Debug, clap::Subcommand)]
+    pub enum Subcommands {
+        /// List all tags.
+        List,
+    }
+}
+
 pub mod credential {
     #[derive(Debug, clap::Subcommand)]
     pub enum Subcommands {