Add branch apply go GitButler CLI

This will help measuring the performance changes during apply and unapply operations.

Author: Byron

crates/gitbutler-cli/src/args.rs

@@ -52,6 +52,11 @@ pub mod vbranch {
             /// The name of the virtual branch to unapply.
             name: String,
         },
+        /// Add a branch to the workspace.
+        Apply {
+            /// The name of the virtual branch to apply.
+            name: String,
+        },
         /// Create a new commit to named virtual branch with all changes currently in the worktree or staging area assigned to it.
         Commit {
             /// The commit message

crates/gitbutler-cli/src/command/vbranch.rs

@@ -1,6 +1,6 @@
-use anyhow::{bail, Result};
+use anyhow::{bail, Context, Result};
 use gitbutler_branch::{BranchCreateRequest, BranchIdentity, BranchUpdateRequest};
-use gitbutler_branch_actions::{get_branch_listing_details, list_branches};
+use gitbutler_branch_actions::{get_branch_listing_details, list_branches, BranchManagerExt};
 use gitbutler_command_context::CommandContext;
 use gitbutler_project::Project;
 use gitbutler_stack::{Stack, VirtualBranchesHandle};
@@ -53,6 +53,23 @@ pub fn unapply(project: Project, branch_name: String) -> Result<()> {
     )?)
 }
 
+pub fn apply(project: Project, branch_name: String) -> Result<()> {
+    let branch = branch_by_name(&project, &branch_name)?;
+    let ctx = CommandContext::open(&project)?;
+    let mut guard = project.exclusive_worktree_access();
+    debug_print(
+        ctx.branch_manager().create_virtual_branch_from_branch(
+            branch
+                .source_refname
+                .as_ref()
+                .context("local reference name was missing")?,
+            None,
+            None,
+            guard.write_permission(),
+        )?,
+    )
+}
+
 pub fn create(project: Project, branch_name: String, set_default: bool) -> Result<()> {
     let new = gitbutler_branch_actions::create_virtual_branch(
         &project,

crates/gitbutler-cli/src/main.rs

@@ -25,6 +25,9 @@ fn main() -> Result<()> {
                 Some(vbranch::SubCommands::Unapply { name }) => {
                     command::vbranch::unapply(project, name)
                 }
+                Some(vbranch::SubCommands::Apply { name }) => {
+                    command::vbranch::apply(project, name)
+                }
                 Some(vbranch::SubCommands::SetDefault { name }) => {
                     command::vbranch::set_default(project, name)
                 }